MagIC Manual
Contents
1. and file structure for the data and click on Apply Store your data on magic site Ico 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 1s 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 no quotes Select yes to send offsets to the telescope control system TCS and no to performing a coordinated offset Type q to exit Run the script 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 ON while for2. between the magic site computer and llama or burro use the MAGIC shortcut inside Transmit No password is required You should copy your data over to Data_Burro or Data_Llama where it can be stored during your run A useful feature for keeping the Data_Burro 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 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 lco cl 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 messages 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 LOIS System Console Lowell Observatory Hel Instrumentation System p System Status LOIS 3 LOIS Ver
3. temperature of 120C 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 u g r i 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 and the shutter cable to the instrument power supplies 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 Table 1 Standard Filters Filter Central A Passband Throughput FWHM A Mag for 1 e sec Extinction coefficient Harris B 4303 1045 MAR 0 21 Harris V 5430 971 27 17 0 12 Harris R 6393 1524 27 42 0 10 Harris 8372 2102 26 79 0 04 VR 6100 836 Sloan u 3522 634 25 09 0 49 Sloan g 4803 1409 27 51 0 09 Sloan r 6254 1388 27 44 0 16 Sloan i 7668 1535 21 1 0 04 Sloan z 9114 1409 26 21 0 04 Measurements are based on engineering observations taken on 2004 March 8 e custom filter for KBO observations see 122 Jewitt D Luu J amp Chen J 1996 Astron J 11
4. 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 Table 7 Detailed description of LOIS stdstar Script Script line proc stdstar filter wheel 0 pos 0 filter wheel 1 pos l 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 l 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 MagIC Manual LCO 30 doc Explanation of command 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 Sloan g 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 r 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 1 filter position an object frame 2 exposures 5
5. 2 Fukugita M Ichikawa T Gunn J E Doi M Shimasaku K amp Schneider D P 1996 AJ 111 1748 MagIC Manual LCO 30 doc 2008 05 14 1 09 2 THE SITE AND E2V CCDS 2 1 Overview of the Sile At the 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 11 focus of Magellan the Ik x Ik SITe CCD has a plate scale of 0 037 arc seconds pixel the full 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 Ix1 5 3 CONTROL SOFTWARE LOIS 3 1 Overview Data acquisition for MagIC II is carried out using version 4 of the Lowell Observatory Instrumentation System LOIS LOIS 4 runs on a Sun computer magic site l
6. 3 r filter position 3 has finished offset delta ra 10 delta dec 0 delta rot 0 go frame object nexp 1 etime 60 log 3 r filter position 4 has finished log 3 dither has finished 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 17 for set i 0 Si lt Snexp incr i 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 has finished filter wheel l pos 4 go frame object nexp l etime 60 log 3 1 filter position 2 has finished offset delta ra 10 delta dec 10 delta rot 0 go frame object nexp 1 etime 60 log 3 1 filter position 1 has finished log 3 dither2filter has finished 4 3 Known problems and shortcomings 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
7. 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 00 X Magellan Telescope Control wote ng 16 51 05 535 2000 00 06 16 00 4 2005 04 20 07 57 35 1 7 09 59 01000 Unknown Unknown 0 00 0 00 0 Coord Hove Rel Hove 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 4 3 first home the filter wheel this prevents the filters from being exposed to unnecessary MagIC Manual LCO 30 doc 2008 05 14 1 09 13 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 Remember to REMOVE your data from the host c
8. GENERAL USER MANUAL FOR MAGIC II General User Mantial 1or Masi acte aci s tao ANAN NN AN NANA 1 Ms Modi Ka a VA AA 2 Z de sil amie 2 CNCD Sma AN NAN NN NN NA 3 Zils OVEN W OD ME SE ma ANA AKA 3 Dds ONEVIEW OL UGE AN sumei donarea deal AG ANGAL nada nna D GA need 3 De ac OHiroL SOL wate ON kaaa a a aa oa Naa a aa N 3 Sul ACEL NE Na AA AN illa Sl nl Ss a al pila dle ei S 3 Ic UA OUI a otecee etait alae otel INUNA NAGANA UN AALAGA 4 3 3 Offsetting to the center of the CCD revised April 2008 0 7 700002000aaasssaasssnassssaaass 6 Se RCC Ol CM Al Academie AA Sai ae AA 7 Sal ELCs sae nada arene NANG encase NAAN DAA AA ANA 12 da OPE GALLO Meal Ue aaa ca eta E anal tata alai d td at i A 13 Ad ROlatorOtisets for Catalog TICS isa cs atei aaa aa alte aa 2 d a i d a d a da 13 Be EOIS SOLID AA taca 13 4 3 Known problems and shortcomings 110101 a 17 a AONO AA AN 18 gt Amper definitions 106 the SITE aaa AA 18 dala MOCO NAA NA ON AN 18 3 2 Ouadeanipilier trae Or Sani ANONG NANA NANANA 18 5 3 D akamphter trame Or Sant ANON a AA ANA to da 19 MagIC Manual LCO 30 doc 2008 05 14 1 09 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
9. 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 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 lco 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 1s recycled after each run so you will want 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 store Root File Name test Extension Number Add the fits extension o On Off Auto Store Images o 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 2007 aug23 Figure 3 In this window set the pathname
10. 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 A O X MagIC Instrument Control tO ti t2 t3 t4 t5 t6 t7 18 Magic t0 Magic B Magic V MagIC_R Magic MaglC VR Cont7130 HAB563 Pinhole b0 bi b2 b3 b4 b5 b6 b7 b MagIC_bO MagIC_u Magic g Magic r Magic i Magic z Cont3388 Cont5260 OIlI5S007 Home Wheels _ Reinitialize mee 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 12 Telescope control module The Magellan Telescope Control Module provides a communication 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 5 will be included in the FITS header 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 Ii you do the most recent update information will be written to the header instead of the original exposure information The
11. al LCO 30 doc 2008 05 14 1 09 11 200 X MagIC Instrument Control tO ti t2 t3 t4 t5 t6 t7 15 Magic t0 Magic B Maglc V MaglC R Magic MaglC VR Cont7130 HA6563 Pinhole b0 bi b2 b3 b4 b5 b6 b7 b Magic bo MagIC_u Magic g Magic r Magic_i Magic z Cont3388 Cont5260 01113007 Home Wheels Reinitialize mee 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 a AeA X MagIC Instrument Control 10 ti t2 t3 t4 t5 t6 t7 18 Magic 10 Magic B MagIC_V Magic R Magic MagIC_VR Cont7130 HA6563 Pinhole b0 bi b2 b3 b4 b5 bb b7 b Magic bO MagiC_u Magic g Magic r MagIC i Magic z Cont3388 Cont5260 01115007 Home Wheels Reinitialize wheel Status 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
12. ase 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 14 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 1s not necessary to specify this in order to keep the same orientation Table 6 Commands for LOIS Scripts Definitions and Notes filter wheel Top or bottom filter wheel Filter position on the wheel Command starts an exposure followed by frame xx bias dark object Type of frame Number of exposures Exposure duration seconds set amplifier Command to set amplifiers to use followed by amp xx 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 l
13. ate 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 Ouad 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 I 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 19 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 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 Amplifier A 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 Ampl
14. co cl located in the equipment room of the Baade telescope The observer can use either observer workstation in the Baade control room burro lco cl or llama lco cl to run the script magic which will automatically log into magic site lco 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 magice11v MagIC Manual LCO 30 doc 2008 05 14 1 09 3 2 Startup Normally an the instrument specialist will already 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 1f any see 84 2 to the LOIS home directory using the FTP program Transmit If LOIS is running you can skip to 83 3 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
15. gIC CCD Camera Control Quad Amp Bin lxl1 Number of Exp Exp Time sec Ob ject Title Single 10 00 2128 1 DARK 2168 test dark frames FITS Comments 40 test dark frames any other notes Dark any other notes DARK test 025 fits Process ISI On Exposure Timer Object Dark Bias Frame Type Figure 6 MagIC CCD Camera Control status while exposing MagIC Manual LCO 30 doc 2008 05 14 1 09 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 Xx Magic CCD Camera Control Quad Amp Bin lxl1 Number of Exp 1 Exp Time 10 00 sec Ob ject Title Single 10 00 KI pis 1 DARK 2166 test dark frames FITS Comments 40 Dark any other notes test dark frames DARK test 025 fits ling On Exposure any other notes w Frame Type Object Dark Bias iar Figure 7 MagIC CCD Camera Control status while reading out 7 k 9 9 N Magic E2V CCD Camera Control Dual Amp Ein 1 l Humber of Exp 1 Exp Time 000 sec Object Title single 0 00 1030 1 bias T157 AQ FITS Comments Bias bias utde0470 01 0 fits Figure 8 MagIC CCD Camera Control status when ready to take the next exposure Displaying data All images are automatically displayed to the ds9 window SAOimage ds9 Figure 9 is a standard image display and analysis
16. ifier 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 20 OverClock Amplifier D 1065 2089 2050 2068 Last Modified 08 3 1 2006 Amplifier E Appl Piier Dis MagIC Manual LCO 30 doc 2008 05 14 1 09
17. ometimes 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 1t will hang while trying to write out subsequent exposures Usually everything works fine on restart The cause of this bug 1s also unknown and it 1s 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 lco 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 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 gener
18. omputer magic site lco cl prior to the end of your observing run AFTER YOU MAKE A COPY OF THE DATA to the observer computer llama or burro or elsewhere The data copy on magic site lco cl is intended as temporary data storage not permanent data storage which should be on your DVD hard drive or other media 4 OPERATIONAL 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 Nasmyth 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 Tcl 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 er
19. or reading out LOIS may crash if aborted during read out 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 Saturation levels for the SITe 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 File numbers When you restart LOIS after running a series of exposures the file number skips one 1f 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 number This is actually a feature not a bug a skipped file number indicates that LOIS was restarted 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 18 biases The duplicate files will have different numbers The cause of this bug 1s unknown You should notify the technical staff if it appears Failure to write FITS files LOIS s
20. seconds each Write to the LOIS log screen 1 filter set has finished Move bottom filter wheel to Sloan z filter position 2008 05 14 1 09 16 Script line Explanation of command go frame object nexp 2 etime 5 an object frame 2 exposures 5 seconds each log 3 z filter has finished Write to the LOIS log screen z filter set has finished filter wheel 1 pos 0 Move bottom filter wheel to OPEN position filter wheel 0 pos 2 Move top filter wheel to V filter position go frame object nexp 2 etime 5 an object frame 2 exposures 5 seconds each log 3 V filter has finished Write to the LOIS log screen the V filter set has finished filter wheel 0 pos 3 Move top filter wheel to R filter position go frame object nexp 2 etime 5 an object frame 2 exposures 5 seconds each log 3 R filter has finished Write to the LOIS log screen the R filter set has finished log 3 stdstar has finished Write to the LOIS log screen the stdstar script has finished Close script Example 2 dither The following script sets the filter wheel takes an exposure executes a coordinated offset and takes another exposure proc dither 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
21. sion 4 4 0 MIT LOIS Lois Initialized Waiting for Commands Auto 5tore Java Virtual Machine Initialized Avail Disk Dither Current Next Version Figure 1 LOIS System Console startup screen Open modules In the LOIS System Console click on the Configure button This will display the configuration window found in Figure 2 MagIC Manual LCO 30 doc 2008 05 14 1 09 900 X configlois Default Configs Telescope Interface Display Interface None Hone None None magellan magic Magicfilt DS9 XPA o 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 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 Mag Cfilt instrument 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 initialization of the filter wheels Three new GUI elements should appear which are described in the follow section a Camera Control
22. t Description 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 or 4x4 e2v Ixl Enter the number of exposures in a sequence Enter the exposure time in seconds Enter the object title This will be entered into the FITS header as Object Provides two comment lines for the FITS header Choose the frame type for the FITS header Object opens the shutter Dark and Bias do NOT open 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 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 Ma
23. t float gt epoch float The epoch of the coordinates that you are offsetting from and is require for an offset w o guiders 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 For a coordinated RA and DEC offset with the guiders offset delta_ra lt value gt delta_dec lt value gt With the instrument rotator offset delta_ra lt value gt delta_dec lt value gt delta_rot lt value gt 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 Offset move in azimuth and elevation offset delta_az lt value gt delta_el lt value gt delta_rot lt value gt MagIC Manual LCO 30 doc 2008 05 14 1 09 Example 1 stdstar 15 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 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 1 filter has finished filter wheel
24. 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 ad 900 N IRAF xgterm 0 0 IRAF Image Reduction and Analysis Facility PACKAGE magic TASK tomagic ccdname e2v Move to CCD center site or e2v queryl yes Send RA DEC offset to TCS query3 no llo coordinated offset mode ql magic gt i Figure 4 Parameter file for IRAF script tomagic Set ccdname to either site or e2v 3 4 Recording data 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 0080 X Magic E2V CCD Camera Control Dual Amp Bin 1x1 Humber of Exp Exp Time 0 00 sec Ob ject Title bias FITS Comments Figure 5 MagIC CCD Camera Control module Use this module to define the number of exposures exposure time object title type of image binning readout mode and comments Exposures are taken by selecting either the test or go buttons MagIC Manual LCO 30 doc 2008 05 14 1 09 Table 4 MagIC II Camera Control Module Inputs Input Detector Mode Binning Number of Exp Exp Time Object Title FITS Comments Frame Type Test Go Abor
25. 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 MagIC Manual LCO 30 doc 2008 05 14 1 09 10 LOIS disp set state on min XXX max XXX scale lt logllinearlrawlauto 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 for more details OOO SAOlmage 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 File Edit Frame Zoom Scale Color Region WCS about open save imy save fits save mpeg header source print page exit SSS tts Figure 9 Sample of ds9 display tool for LOIS 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 MagIC Manu
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