General User Manual for MagIC II, Version 31
Contents
1. Detailed description of LOIS stdstar Script o 17 Part I General User Manual for MagIC II 1 Introduction to MagIC II The Raymond and Beverly Sackler Magellan Instant Camera MagIC II hosts two CCDs within the same dewar a 2k x 2k SITe CCD and a 1k x 1k e2v CCD NOTE The e2v frame transfer CCD that has not yet been commissioned for general use The dewar is continuously cooled by a CryoTiger to hold a detector temperature of 120 C The dewar is mounted to a dual filter wheel which contains 18 positions for 4 inch square filters so that 16 filters can be mounted at one time there is an open position in each wheel Both the SITe and the e2v share the same filters The standard mounted filters are the Harris B V R I and Sloan v g r 7 Z as well as a custom VR filter Both CCDs are run using the Lowell Observatory Instrumentation System LOIS Only one CCD can be operated at a time and switching between them requires physically swapping the optical fibers on the instrument computer rainbow colored wire Full instructions on how to switch between them are given in the Mountain Support Manual Only an instrument specialist should switch between the SITe and the e2v this should not be attempted by the observer In 2008 the control software for the e2v was updated to the Lowell Observatory User Interface While the original LOIS software should still work please see the separate User s Manual for MagIC e2v an2. an exposure followed by frame xx frame bias dark object Type of frame nexp float Number of exposures etime float Exposure duration seconds set_amplifier Command to set amplifiers to use followed by amp xx amp A B C D AB CD ALL Amplifiers to use case sensitive offset Command to set telescope offset followed by delta ra lt float gt delta dec lt float gt delta_rot lt float gt delta_ra float Offset in ra arcseconds delta_dec float Offset in dec arcseconds delta_az float Offset in altitude delta_el float Offset in elevation delta_rot float Offset in rotation timeout int Integer default timeout is 90s noguide noguide Used for a relative move epoch float The epoch of the coordinates that you are offsetting from and is required for an offset w o guiders a Note the noguide and epoch are used in a relative move that is not coordinated with the guiders xx what is meant by epoch here xx How you use the keywords defines the type of offset you want e For a coordinated RA and DEC offset with the guiders offset delta ra lt value gt delta _dec lt value gt e With the instrument rotator offset delta ra lt value gt delta dec lt value gt delta _rot lt value gt e Offset move in RA and DEC without the guiders offset delta ra lt value gt delta dec lt value gt epoch lt value gt noguide Add the delta_rot value for to include the instrument rotator e Offset move in azimuth and elevation
3. field is 40 arc seconds square The read noise in the left and right amplifiers is 6 0 6 5 electrons with gains in the range 2 4 2 6 e ADU Table 3 gives the approximate readout times based on binning and amplifier settings Note there may be problems with the binning modes The e2v is not currently commissioned for general use Table 3 e2v readout time estimates Binning Dual Amp sec 1x1 5 3 Control Software LOIS 3 1 Overview Data acquisition for MagIC II is carried out using version 4 of the Lowell Observatory Instru mentation System LOIS LOIS 4 runs on a Sun computer magic site 1lco cl located in the equipment room of the Baade telescope The observer can use either observer workstation in the Clay control room zorro 1co cl or guanaco 1co cl to run the script magic which will au tomatically log into magic site 1lco cl and start LOIS LOIS can be configured to launch one of several modules that control various aspects of the system a telescope interface a camera interface SITe or e2v an instrument interface the filter wheel and a display interface The same version of LOIS controls both the SITe and the e2v with only minor differences mostly options for readout modes and binning Thus the instructions below apply to operating either camera The LOIS module to run the SITe is called magic and the module to run the e2v is magiceiiv 3 2 Start up Normally an the instrument specialist will alr
4. 1lco cl If that does not solve the problem the instrument specialist or telescope operator will cycle power on the electronics boxes and reboot the instrument computer 5 Amplifier definitions for the SITe LOIS MagIC Information Document Number 001 Title Amplifier Definitions Author Brian W Taylor Started 11 04 2005 Last Revised 08 31 2006 19 5 1 Introduction The MagIC SITe 424a CCD has four amplifiers and an image area of 2048 columns and 2049 rows Each amplifier when used will generate 20 prescan pixels With MagIC along with these prescan pixels there are 40 overscan columns per amplifier and 20 parallel over clocked rows in each frame 5 2 Quad amplifier frame organization Frame organization for the quad amp as shown in the above image demonstrates the location of each amplifier in the final deinterlace of the image and are defined as follows using the IRAF inclusive image block x1 x2 y1 y2 or column 1 column 2 row 1 row2 Prescan Amplifier A 1 20 1 1025 Prescan Amplifier B 21 40 1 1025 Prescan Amplifier C 1 20 1026 2049 Prescan Amplifier D 21 40 1 2049 Image Amplifier A 41 1064 1 1025 Image Amplifier B 1065 2088 1 1025 Image Amplifier C 41 1064 1026 2049 Image Amplifier D 1065 2088 1026 2049 Overscan Amplifier A 2089 2128 1 1025 Overscan Amplifier B 2129 2168 1 1025 Overscan Amplifier C 2089 2128 1026 2049 Overscan Amplifier D 2129 2168 1026 2049 OverClock Amplifier
5. A 42 1065 2050 2088 OverClock Amplifier B 1066 2089 2050 2088 OverClock Amplifier C 42 1064 2090 2128 OverClock Amplifier D 1065 2089 2090 2128 20 Amplifier A Figure 15 Map of SITe Quad amplifiers 5 3 Dual amplifier frame organization This reference is for the dual amp readout for Amps C and D If switching to dual amp readout for Amps A and B the values are the same using A for C and B for D Prescan Amplifier C 1 21 1 2049 Prescan Amplifier D 21 40 1 2049 Image Amplifier C 41 1064 1 2049 Image Amplifier D 1065 2088 1 2049 Overscan Amplifier C 2089 2128 1026 2049 Overscan Amplifier D 2129 2168 1026 2049 OverClock Amplifier C 42 1064 2050 2068 OverClock Amplifier D 1065 2089 2050 2068 Last Modified 08 31 2006 21 Amplifier Amplifier D Figure 16 Map of SITe dual amplifiers 6 Revision Log e 2010 August Revisions finished e 2010 July Split Mountain Support and MIT Support off of main manual e 2010 June Amanda Zangari conversion to ATEX e 2008 April Elisabeth Adams e 2008 January Jim Elliot Elisabeth Adams e 2007 November Jim Elliot Matt Lockhart Robyn Sanderson e 2007 August Jim Elliot Steve Kissel Matt Lockhart Folkers Rojas e 2006 September Susan Kern 7 Notes on style for future editors Added by Amanda Zangari June 22 2010 e The instrument chips are MagIC SITe and MagIC e2v All instances including emails have been correc
6. Bottom Moving Figure 11 MagIC Filter Wheel Control while moving to a new filter Yellow indicates the filter that the wheel is moving from red the filter the wheel is moving to When the filter is in position it will be colored green Figure 12 Only one filter from each wheel can be selected at any one time and one of those filters should be in the OPEN position MagIC_t0 or MagIC_b0 BE SURE THAT THE WHEEL NOT CONTAINING THE DESIRED FILTER IS IN THE OPEN POSITION To home the filter wheels click on the Home Wheels button Please home the filter wheels at the end of the night to keep the filters from being exposed to unnecessary dust e080 X MagIC Instrument Control to ti t2 t3 t4 t5 t6 v7 t8 Magic _t0 Magic_B MagiC_V Magic_R Magic_I MagiC_VR Cont7130 HA6563 Pinhole bo b1 b2 b3 b4 b5 b6 b7 b8 Magic_b0 Magic_u MagIC_g Magic MagIC_i Magic_z Cont3388 Cont5260 01115007 Hone Wheels Reinitialize Wheel Status Bposition 3 Figure 12 MagIC Filter Wheel Control after selection of a filter The current filters are in green Be sure one of these is OPEN MagIC_t0 or MagIC_b0 e Telescope Control Module The Magellan Telescope Control Module provides a com munication link to the Magellan TCS Whenever you take an exposure either via Test or Go the TCS module will automatically be updated at the beginning of the exposure and the information in Table 3 4 will be included in the FITS h
7. General User Manual for MagIC II Version 31 Last Modified by Amanda Zangari August 4 2010 Contents I General User Manual for MagIC II 1 Introduction to MagIC II 2 The SITe and e2v CCDs 21 Overview OF the STE oe cea de es A he ean BA a N 2 2 Overview OF ThEse2VE is ota tt fed ee aod on Ke a EE Bees Ge tae 3 Control Software LOIS Delis OVERVICW a o a IS de Math it Ah oe ght BS a othe ee ae Be Aida Bat NO 3 3 Offsetting to the center of the CCD revised April 2008 3 4 Recording Data sd da a ele A ARA a ee 30 HSU OW fs 0a Re As hese UR Btn ali one a a TE 4 Operation Issues 4 1 Rotator offsets for catalog files 2 0 2 0 02 02 a 4 2 LO LS Script La bes ot ae a ee A ae a eR a Eh ee ays ee 4 3 Known Problems and shortcomings 000000 eee eee AA Trouble 68 se Bi ti Wye Suh er Sona AoE aoa pas Eid O gs elk 5 Amplifier definitions for the SITe Bek Introduction lt n ened toa dg a Se Sh A a ihe BB 5 2 Quad amplifier frame organization 5 3 Dual amplifier frame organization ooo a ee 6 Revision Log 7 Notes on style for future editors List of Tables 1 Standard Filt rs oo af ir os bap gee Bk ee Basle Sb eR ae a a a 3 2 SITe readout time estimates 0 soa o a a e e a a e a 3 3 e2v readout time estimates onoo e e a e e e a 3 4 MagIC II Camera Control Module Inputs e 8 5 FITS header information from TOS 13 6 Commands for LOIS Scripts 2 a 15 7
8. ading out 0008 Magic E2V CCD Camera Control Dual Amp Bin 1x1 Number of Exp 1 Exp Time 0 00 sec Object Title Single 1030 bias 1152 40 FITS Comments ER JES ut080420 010 fits wo Frame Type Object Dark Bias Abort Figure 8 MagIC CCD Camera Control status when ready to take the next exposure e Displaying Data All images are automatically displayed to the ds9 window SAOimage ds9 Figure 9 is a standard image display and analysis tool that is fully documented with its own help files It is also fully integrated with the IRAF display tools installed on both of the instrument computers For modifying the display on future images the following command may be entered into the LOIS System Console command window LOIS disp_set state on min XXX max XXX scale lt log linear raw auto gt It may be helpful to display images in another ds9 window using standard IRAF commands See the weblink for Reducing MagIC Images with IRAF http www lco cl telescopes information magellan instruments magic reducing magic images with iraf reducing magic images with iraf for more details 10 X SAOImage ds9 File Edit Frame Zoom Scale Color Region WCS Analysis Help File magic20070731 010 fits Value 7487 linear 1063 000 1028 000 Physical x 1063 000 Y 1028 000 Image x 1063 000 y 1028 000 Framel Zoom 1 000 Ang 0 000 Fle Edit Frame _ Zoom Scale Color R
9. ant to copy the files to a directory on the observer workstation and to removable media that you can take with you when you leave If you need help in doing this ask the instrument specialist X store Root File Name test Extension Number Add the fits extension On Off Auto Store Images On off Storage Path Selection test 012 fits test 013 fits test 014 fits test 015 fits test 016 fits test 017 fits test 018 fits test 019 fits test 020 fits test 021 fits test fits Storage Path data 2007aug29 Figure 3 In this window set the pathname and file structure for the data and click on Apply Store your data on magic site lco cl in data whatever directory_you created If you type a path that does not exist the directory will be created 3 3 Offsetting to the center of the CCD revised April 2008 With MagIC II both the SITe and the e2v are now physically offset from the optical axis Thus each time you move to a new object you must offset to the center of your chosen CCD This is currently handled using the IRAF script tomagic To run this script first launch an IRAF window using the Big Red Button on the observing computer Then load the magic tools ecl gt magic Edit the parameter file to indicate which CCD you are using ecl gt epar tomagic Set ccdname to e2v or site Select yes to send offsets to the telescope control system TCS and no to performing a coordinated offset Type q to exit Run the sc
10. ber This is actually a feature not a bug a skipped file number indicates that LOIS was restarted e Duplicate files with different file names Occasionally LOIS has been noted to write out duplicate files of the same image so you should watch for this when taking sequences of the same exposures including darks and biases The duplicate files will have different numbers The cause of this bug is unknown You should notify the technical staff if it appears e Failure to write FITS files LOIS sometimes fails to write out FITS files with the error Error Unable to write the Fits File Status 413 Error Unable to Close the Fits File If this occurs you must restart LOIS for it to figure out how to write files properly again or else it will hang while trying to write out subsequent exposures Usually everything works fine on restart The cause of this bug is also unknown and it is somewhat common 4 4 Trouble Under ideal circumstances the system will have be started and tested ahead of your observing run by the instrument specialist and it will remain ready to be powered for your run When properly set up the operation of MagIC under LOIS has proven reasonably robust In the case that odd error messages occur during the startup simply exit the current LOIS session and run the start script again If you still have problems ask the instrument specialist or telescope operator to reset the PCI card on the instrument computer magic site
11. bject nexp 2 etime 5 log 3 z filter has finished filter wheel 1 pos 0 filter wheel 0 pos 2 go frame object nexp 2 etime 5 log 3 V filter has finished filter wheel 0 pos 3 go frame object nexp 2 etime 5 log 3 R filter has finished log 3 stdstar has finished Define procedure name open script Move top filter wheel to OPEN position Move bottom filter wheel to Sloan u filter position Execute an object frame 2 exposures 25 seconds each Write to LOIS log screen u filter set has finished Move bottom filter wheel to Sloang filter position Execute an object frame 2 exposures 10 seconds each Write to the LOIS log screen g filter set has finished Move bottom filter wheel to Sloan filter position Execute an object frame 2 exposures 5 seconds each Write to the LOIS log screen r filter set has finished Move bottom filter wheel to Sloan 7 filter position an object frame 2 exposures 5 seconds each Write to the LOIS log screen i filter set has finished Move bottom filter wheel to Sloan 7 filter position an object frame 2 exposures 5 seconds each Write to the LOIS log screen z filter set has finished Move bottom filter wheel to OPEN position Move top filter wheel to V filter position an object frame 2 exposures 5 seconds each Write to the LOIS log screen the V filter set has finished Move top filter wheel to R filter position an object frame 2 exposures 5 seconds each Write to the LOIS log screen the R filt
12. console It is safer to abort while the status is Exposing or LOIS may crash All information entered into the input fields will be mirrored to the Status window and recorded in the FITS header After you choose either test or go a process bar Figure 6 keeps you apprised of what the camera is doing The process bar is blue while the camera is exposing or reading out the chip A timer counts down the remaining exposure time and shows what exposure number is being collected Xx MagiC CCD Camera Control Quad Amp Bin 1x1 Number of Exp 1 Exp Time 10 00 sec Object Title single 10 00 1 DARK test di FITS Comments any other notes test dark frames Process On Exposure any other notes Timer Frame Type Object 4 Dark Bias os Figure 6 MagIC CCD Camera Control status while exposing Once an exposure is complete the process bar says Reading Figure 8 until the file is read out at which point it briefly says Storing When the system is ready for the next action the bar turns green and says Camera Ready X MaglC CCD Camera Control Quad Amp Bin 1x1 Number of Exp 1 Exp Time 10 00 sec Ob ject Title gle 10 00 1 DARK test dark frames FITS Comments K any other notes test dark frames DARK test 023 fits Process On Exposure any other notes Timer C e Frame Type Object 4 Dark Bias Abort Figure 7 MagIC CCD Camera Control status while re
13. d LOUI for up to date information on the e2v Table 1 Standard Filters Filter Central A Passband FWHM A Throughput Throughput Mag le sec extinction coefficient Harris B 4303 1045 27 13 0 21 Harris V 5430 971 27 17 0 12 Harris R 6393 1524 27 42 0 10 Harris I 8372 2102 26 79 0 04 VR 6100 836 Sloan a 3522 634 25 09 0 49 Sloan g 4803 1409 27 51 0 09 Sloan 7 6524 1388 27 44 0 16 Sloan 7 7668 1535 27 17 0 04 Sloan 2 9114 1409 26 21 0 04 a Measurements are based on engineering observations taken on 2004 March 8 b Custom filter for KBO observations see Jewitt D Luu J amp Chen J 1996 Astron J 112 1225 c Fukugita M Ichikawa T Gunn J E Doi M Shimasaku K amp Schneider D P 1996 AJ 111 1748 2 The SITe and e2v CCDs 2 1 Overview of the SITe At the f 11 focus of Magellan the 2k x 2k SITe CCD has a plate scale of 0 069 arc seconds pixel the full field is 2 36 arc minutes square The read noise in the four quadrants lies in the range 4 5 6 2 electrons with gains in the range 1 90 2 04 e ADU Table 2 gives the approximate readout times based on binning and amplifier settings Note there may be problems with the binning modes Table 2 SITe readout time estimates Binning Single Amp sec Quad Amp sec 1x1 73 23 2x2 24 8 4x4 11 2 2 Overview of the e2v At the f 11 focus of Magellan the 1k x 1k SITe CCD has a plate scale of 0 037 arc seconds pixel the full
14. eader The information in the window is NOT a real time display of the TCS information To get current information you can click on the Update button Since the FITS header is written after the exposure is over you should not try to update the telescope module after beginning an exposure If you do the most recent update information will be written to the header instead of the original exposure information 12 The Coord Move button opens a pop up window which is used to execute a coordinated offset moving the telescope and moving the guiders so as to keep the guiders tracking the guide and wavefront stars The Rel Move button offsets the telescope without moving the guiders Make sure the telescope is not guiding before using this button 0 06 x Magellan Telescope Control Update _ Stop 6 04 20 07 57 30 01000 Unknown 0 Coord Hove Rel Hove Sidereal Track Figure 13 Magellan Telescope Control Table 5 FITS header information from TCS Header Keyword Definition TELRA Right Ascension of the telescope pointing TELDEC Declination of the telescope pointing EQUINOX Equinox of TELRA and TELDEC AIRMASS Airmass TELFOCUS Telescope focus readout 3 5 Shutdown Normally shutdown will be handled by an instrument specialist at the end of your run Should you want the shut down the system for example if LOIS has a serious error as discussed in 8 first home the filter wheel this prevents
15. eady have MagIC II set up and your data directory for the night created If so the only remaining step you need to take before taking data is to copy your scripts if any see 84 2 to the LOIS home directory using the FTP program Transmit If LOIS is running you can skip to 83 3 e Make a data directory An internal disk on the magic site computer intended only for data storage is mounted as data on magic site lco cl Create a directory under data for the night s data This is temporary data storage and should be erased at the end of each run To transfer data between the magic site computer and guanaco or zorro use the MAGIC shortcut inside Transmit No password is required You should copy your data over to Data_Zorro or Data_Guanaco where it can be stored during your run A useful feature for keeping the Data_Zorro directory up to date during the night is the Synchronize button in Transmit The observer machines have DVD drives that you can use to create a copy of your data for transport home e Start LOIS Before starting the software confirm with the telescope operator that the CCD electronics for either the SITe or the e2v have been powered on and that the fibers for that CCD are connected to the PCI card on magic site 1co cl1 This should be done as part of the instrument setup From an observer workstation generate an xterm window Then run the startup script xterm gt magic There will be some diagnostic mes
16. egion wcs about open saveimg save fits save mpeg header source print page exit Figure 9 Sample of ds9 display tool for LOIS e Instrument module filter wheel The filter wheel is controlled through the MagIC Filter Wheel Control window At startup the GUI pops up without specifying filter names Once initialization which can take a minute or two is complete the wheel positions should all have the correct filters identified Figure 10 0 06 X MagIC Instrument Control tl t2 t3 t4 t t6 t7 t8 to Magic_t0 Magic_B Magic_v Magic R MagiC_1 MagiC_vR Cont7130 HA6563 Pinhole bo b1 b2 b3 b4 b5 b6 b7 b8 Magic_b0 Magic_u MaglC g Magic_r MagiC i MagiC_z Cont3388 Cont5260 om5007 Hone Wheels Reimitialize Wheel Status Home Figure 10 MagIC Filter Wheel Control after initialization The current filter on the wheels will be green To move the filter wheels click on the desired filter name During movement to another filter position the previous filter on the wheels is yellow and the chosen filter on the wheels will be red Figure 11 e cse _ XI MagIC Instrument Control f t0 ti t2 t3 t4 t5 6 t7 t8 Magic_t0 Magic_B Magic_v Magic_R MagIC_I MagiC_vR Cont7130 HA6563 Pinhole b0 bl b2 b3 b4 b b6 b7 b Magic bo MagiC_w Magic o A MagIC_i MagiC_z Cont3388 Conts260 omsoo7 Hone Wheels _Reinitialize vmeel Status
17. er set has finished Write to the LOIS log screen the stdstar script has finished Close script Example 42 dither The following script sets the filter wheel takes an exposure executes a coordinated offset and takes another exposure proc dither 4 filter wheel 0 pos 0 filter wheel 1 pos 3 go frame object nexp 1 etime 60 log_3 r filter position 1 has finished offset delta_ra 10 delta_dec 0 delta_rot 0 go frame object nexp 1 etime 60 log_3 r filter position 2 has finished offset delta_ra 0 delta_dec 10 delta_rot 0 go frame object nexp 1 etime 60 log_3 r filter position 3 has finished offset delta_ra 10 delta_dec 0 delta_rot 0 go frame object nexp 1 etime 60 17 log_3 r filter position 4 has finished log_3 dither has finished J Example 3 dither2filter The following script sets the amplifier to single readout mode then sets the filter wheel takes an exposure executes a coordinated offset and takes another exposure changes the filter takes an exposure executes a coordinated offset back to the original position and repeats the process 3 times proc dither2filter nexp 3 set_amplifier amp D log_3 set amplifier to single amp D for set i 0 i lt nexp incr i 4 filter wheel 0 pos 0 filter wheel 1 pos 3 go frame object nexp 1 etime 60 log_3 r filter position 1 has finished offset delta_ra 10 delta_dec 10 delta_rot 0 go frame object nexp 1 etime 60 log_3 r filter position 2 ha
18. l Amp Object Title bias FITS Comments test ERA X Magic E2V CCD Camera Control Bin 1x1 Number of Exp 1 Exp Time 0 00 sec 0 00 1 none Frame Type v Object Dark Bias os Figure 5 Parameter file for IRAF script tomagic Set ccdname to either site or e2v Table 4 MagIC II Camera Control Module Inputs Input Description Dector Mode Binning Number of Exposures Exp Time Object Title FITS Comments Frame Type Test Go Abort SITe Quad double and single amp readouts with gains of 1 approx 2e ADU are available e2v Double Amp readout is available SITe 1x1 2x2 4x4 e2v 1x1 Enter the number of exposures in a sequence Enter the exposure time in seconds Enter the object title This will be entered in the FITS header as Object Provides two comment lines for the FIT S header Choose the frame type for the FITS header Object opens the shutter Dark and Bias do NOT open the shutter Takes the current exposure and writes to the temporary file test fits This file will be overwritten by subsequent test images if not renamed Takes the current exposure or sequence and writes the data to the configured data directory These files will not be overwritten on the host machine even if you use the same filename Abort the current exposure or the current series of exposures This does not handle aborting scripts which must be done from the LOIS system
19. l can be written to take a series of exposures change filters and move the telescope as needed For use scripts should be added using the MAGIC shortcut in Transmit to the top level of the observer home directory on magic site lco cl home observer since this is where LOIS will look for active scripts At the end of your run save your scripts elsewhere and erase them from home observer Some example scripts are located in home observer SCRIPTS At important caveat for scripts is that THEY WORK ONLY FOR THE QUAD AMP 1x1 BINNING MODE FOR THE SITe Scripts must first be loaded and then run Both tasks are executed by commands entered in the LOIS system console command window To load a procedure in the command window type LOIS source script file name To run a script in the command window type LOIS procedure _name Scripts can be aborted using the red Abort current script button on the LOIS system console Table 6 describes the command line information necessary in scripts If a value is not specified it is assumed to be zero in the case of a floating point input For example using delta_rot 0 means that the rotation does not change from whatever it was defined as but it is not necessary to specify this in order to keep the same orientation 14 Table 6 Commands for LOIS Scripts Command Options Definitions and Notes filter wheel 0 or 1 Top or bottom filter wheel pos 0 8 Filter position on the wheel go Command starts
20. n of the filter wheels Three new GUI ele ments should appear which are described in the follow section a Camera Control Module an Instrument Module and a Telescope Control Module Information regarding what is being loaded and what else is occurring can be found in the LOIS Console window log screen e 06 X configlois Default Configs Telescope Interface Camera Interface Instrument Interface Display Interface None y None w None wv Magic 4 MagiICfilt 4 DS9 XPA magiceiiv Observers Adams Affilation MIT Figure 2 LOIS configuration window Set telescope camera instrument and display interfaces here as well as observer information names and affiliations Select magic for the SITe CCD and magiceiiv for the e2v e Set up data storage on magic site lco cl In the LOIS System Console click the Storage button The Storage window see Figure 3 will allow you to choose the directory on magic site 1lco cl to save your data in If this directory does not exist it will be created it should be a directory only one level below data You can also set the root file name and exposure start number Note that if you restart LOIS the file number will skip a number from the last exposure you took in order to indicate the restart and avoid overwriting data in the event of a crash The disk space on the instrument computer is recycled after each run so you will w
21. offset delta _az lt value gt delta el lt value gt delta _rot lt value gt Example 1 stdstar The following script takes a set of exposures through a series of filters and exposure times The script is defined in detail in Table 7 proc stdstar filter wheel 0 pos 0 15 filter wheel 1 pos 1 go frame object nexp 2 etime 5 log_3 u filter has finished filter wheel 1 pos 2 go frame object nexp 2 etime 5 log_3 g filter has finished filter wheel 1 pos 3 go frame object nexp 2 etime 5 log_3 r filter has finished filter wheel 1 pos 4 go frame object nexp 2 etime 5 log_3 i filter has finished filter wheel 1 pos 5 go frame object nexp 2 etime 5 log_3 z filter has finished filter wheel 1 pos 0 filter wheel 0 pos 2 go frame object nexp 2 etime 5 log_3 V filter has finished filter wheel 0 pos 3 go frame object nexp 2 etime 5 log_3 R filter has finished log_3 stdstar has finished 16 Table 7 Detailed description of LOIS stdstar Script Script line Explanation of command proc stdstar filter wheel 0 pos 0 filter wheel 1 pos 1 go frame object nexp 2 etime 25 log 3 u filter has finished filter wheel 1 pos 2 go frame object nexp 2 etime 10 log 3 g filter has finished filter wheel 1 pos 3 go frame object nexp 2 etime 5 log 3 r filter has finished filter wheel 1 pos 4 go frame object nexp 2 etime 5 log 3 i filter has finished filter wheel 1 pos 5 go frame o
22. ript any time you move to a new target ecl gt tomagic The magnitudes of the offsets to the two CCDs are constant and have been set in tomagic to be 50 5 for the SITe and 92 6 for the e2v note that the SITe is in the opposite direction from the center of the e2v These values are given in arcseconds along the detector axes and the corresponding values in cardinal directions depend on the rotator angle For example for the e2v in EQU 0 0 an object to the south will be offset 92 W and 6 N while for the SITe the same object would be offset 50 E and 5 N Which offset to use is determined automatically so long as the correct CCD is specified in the parameter file The new offsets should have been updated for the SITe and e2v when MagIC was brought to the west Nasmyth port r 606 IX IRAF xgterm 0 0 Image Reduction and Analysis Facility PACKAGE magic TASK tomagic cedname e2v Move to CCD center site or e2v queryl yes Send RA DEC offset to TCS query3 no Do coordinated offset mode ql lmagic gt D Figure 4 Parameter file for IRAF script tomagic Set ccdname to either site or e2v 3 4 Recording Data e Camera Control The camera is controlled through the MagIC CCD Camera Control module displayed in Figure 5 This module is where the observer controls the execution of exposures using either the test or go buttons Table 4 describes each of the inputs for this module 006 Dua
23. s finished filter wheel 1 pos 4 go frame object nexp 1 etime 60 log_3 i filter position 2 has finished offset delta_ra 10 delta_dec 10 delta_rot 0 go frame object nexp 1 etime 60 log_3 i filter position 1 has finished log_3 dither2filter has finished 4 3 Known Problems and shortcomings e Aborting exposures and scripts This can be done only when neither the telescope nor the filter wheel is moving It is safer to abort a script when the process bar on the camera module is blue indicating that the camera is either exposing or reading out LOIS may crash if aborted during read out e Phantom pixels at row 1991 single amp mode of the SITe When reading out in single amp mode the software inserts two bogus pixels at row 1991 The sky data is seen shifted This can in principle be corrected in software but in practice it lies so close to the edge of the field 4 arcseconds that one may not want to go through the effort e Saturation levels for the SITe 18 Note that amplifiers C and D the top two quadrants in quad amp mode as viewed in the SAOimage ds9 window saturate at about 35K ADU well before the other two amplifiers A and B reach saturation e File numbers When you restart LOIS after running a series of exposures the file number skips one if the last frame you took in the previous session was 010 the next frame will by default be 012 Check the Storage button on restart to make sure you have the desired file num
24. sages indicating that old files have been cleaned up The startup script will configure the required environment variables and path names start the default display tool ds9 kill any previous LOIS or ds9 processes and start the main LOIS program The display tool window ds9 will appear on the screen first followed by the LOIS system console Figure 1 The LOIS system console is divided into two windows a command window on the left and a log window on the right TARA X LOIS System Console Lowel Observatory storan Hell Instrumentation System a p System Status LOIS LOIS Version 4 4 0 MIT Lois Initialized Waiting for Commands A re Java Virtual Machine Initialized Z gt aa A Figure 1 LOIS System Console startup screen e Open Modules In the LOIS System Console click on the Configure button This will display the config uration window found in Figure 2 The standard configuration should be the magellan telescope module the magic camera module for the SITe OR the magiceiiv camera module for the e2v the MagICfilt in strument module and the DS9 XPA display interface You also have the option to disable any of these modules After choosing your configuration fill in the fields for Observer and Affiliation and click on Start The camera instrument and telescope modules will be loaded and initialized This process can take a few minutes mostly for the initializatio
25. ted to insure consistency 22 e The following items should be enclosed in typewriter text aka verbatim computer names file names and UNIX commands e LOIS and LOUI are always referred to in caps no styling e All double quotations marks are to be changed into IATFX friendly single quotation marks 23
26. the filters from being exposed to unnecessary dust when not in use Then hit the Exit button on the LOIS Console Window A dialog box Figure 14 will be displayed to verify your request X Exit Lois Do You Really Want To Exit Figure 14 Dialog box confirming desire to exit LOIS 13 Remember to REMOVE your data from the host computer magic site 1lco cl prior to the end of your observing run AFTER YOU MAKE A COPY OF THE DATA to the observer computer guanaco or zorro or elsewhere The data copy on magic site 1co cl is intended as temporary data storage not permanent data storage which should be on your DVD hard drive or other media 4 Operation Issues 4 1 Rotator offsets for catalog files At the central folded port on the Baade telescope the rotator angle offsets which are included in the cat files for the telescope operator for target positions are different that those adopted at the Nas myth ports Most observers will chose 0 0 EQU for columns 8 and 9 of their catalog file that they give to the telescope operator see http www lco cl telescopes information magellan instruments 1 observing catalogs 1 for a full description of the fields required in a catalog file This will produce images that are North right and East down for southern targets and North left and East up for northern targets 4 2 LOIS scripts Note parts of this section may need updating as of May 2008 Scripts written in Tc
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