SDAST meeting #41 Copenhagen Nov
Contents
1. 619 There is an easy fix in j_correction and a new version will be ready for OSA9 Focus of software development All The light curve production in j_ima_iros is the main goal and there are really no other strong wishes User manual and cookbook updates JC Lightcurve extraction at LCR level There is a meaningless phrase in the on line cookbook FLAG 3 should be used for sources that the user really wants in the basic set of sources too many of these will deteriorate the flux determination in other words allow too much noise in the fitting process For flux spectrum determination it is best to put FLAG 1 in order not to let the basic set of sources to grow too much But another run with FLAG 3 for the extra sources is recommended as a preparation for j_src_Ic since in that case RA DEC_OBS becomes equal to RA DEC_CAT Crab calibrations SB EK Perhaps we should make a full circle at a lower off axis angle where the full detector is illuminated Also the Crab on axis in the beginning of an orbit could be interesting Next Crab calibration will be in the beginning of March Proposal must be presented to ESAC at end of January IC table updates NJW CAO SB With OSA9 issue in beginning of 2010 it could be useful to have the IMOD SPAG tables ready note that there is an interaction with the Xe reference channels so re calculation is required No BPL nor RMF updates are known at this moment ADD updates JC Input required before2. 2010 01 28 Do we have an official document site here at DTU Space This question should be addressed to Allan Hornstrup Next meeting will be decided when more is known about the OSA9 release 2009 12 01 NJW Action items A1_41 NJW Test Xe line shape with various spatial gain calibration maps A2_41 SP Update cookbook and Known Issues to let it be known that j_src_Ic always uses RA DEC_OBJ in stead of RA DEC_CAT A3_41 JC Demonstrate how the PSF changes when a mosaic is been built as a function of the input images A4_41 NJW Find the PSF width as a function of position in the j_ima_iros image and some examples from j_ima_mosaic A5_41 SP Disseminate the solution to the GAIN SCP issue using dal_detach pattern JMXi GAIN SCP and document it A6_41 JC CAO NJW SP ADD updates before 2010 01 28 to JC in tex file format
3. SDAST meeting 41 Copenhagen Nov 24 2009 Participants St phane Paltani Erik Kuulkers S ren Brandt Niels Lund J r me Chenevez Niels J rgen Westergaard Later Carol Anne Oxborrow Carl Budtz Jgrgensen INTEGRAL and JEM X status SB JMX2 is now the default unit so JMX1 was used from revol 170 through 855 With calibration and commissioning it amounts to more than 700 revolutions 6 years Gain evolution JMX1 DV setting was lowered by one step in revol 747 to 71 710 V The gain increase rate when corrected for voltage changes has diminished Particle trigger rate Solar activity is still very low so the particle background makes the onboard processor very busy with event rejection leading to higher deadtime Calibration source decay Cd sources are down by a factor of 30 Fe sources are down by a factor of 6 Electronic calibration Electronics are very stable tiny change in amplifier response nothing to worry about Gain profiles during an orbit Gain correction works well Hotspots in JMX2 A little bit of hotspot activity has been observed in JMX2 RAWX 72 at very low energies certainly below 3 keV The rate is quite low and its influence on the deadtime is minor Spatial gain evolution The Xe line has been followed in 50 revolution intervals and an evolution of the map can be tracked These will be implemented in the IMOD IC files Tests should be performed to see how short IMOD epochs are really required e
4. alorimeter and high time resolution spectrometer ESAC news EK Peter Kretschmar has now been appointed mission manager for INTEGRAL Else it is quite a calm period A new AO is to be issued in end of March 2010 so a documentation update will be asked for j_ima_iros for OSA8 NL The j_src_ls can be forced to use source catalog position by setting FLAG 3 as input to j_ima_iros in which case it will never put its own position Explanation of the FLAG use in j_ima_iros Binary FLAG interpretation 1 Copied from User Catalog FLAG 2 Copied from User Catalog FLAG 4 Source has DETSIG gt 4 in search band 1 3 to 7 keV 8 Source has DETSIG gt 4 in search band 2 7 to 11 keV 16 Source has DETSIG gt 4 in search band 3 11 to 20 keV 32 Source has been found in several search bands 64 Source has been identified inside j_ima_iros with a User Catalog source source identification in srcl_res can come from other programs as well 1024 Source has been accepted as valid by j_ima_iros Why are some sources not found by j_ima_iros when they are clearly visible in the image A distinction between various IROS stopping signals should be introduced there are 14 different ways of stopping the IROS loop e g if the sources is deemed insignificant With strong sources there is an increased probability for spurious peaks SP thinks that this is a minor problem the image can be searched by other means e g j_ima_src_locator and other strange cas
5. es will appear Note after meeting The reason for this behavior has been located in the j_ima_iros code as a bug and a new version will soon be ready Lightcurve extraction in j_ima_iros NL Easier to incorporate the light curve extraction into j_ima_iros since so many features are already present there What method to use NJW See technical note presented at the meeting The single source approach as well as least square solution was presented and discussed The recommendation was that the least square solution should be the baseline but options for the single source solution and the maximum likelihood fitting in the case of very short timebins where there are very few counts Gain aging and Xe line CAO No gain aging seen for JEM X1 since it has stabilized over its many years of use We can however expect to see such aging in JEM X2 now that it s switched on JEM X1 does show temperature dependant gain non linearities that are corrected offline by the use of IC gain history tables JEM X2 was switched on with the wrong PHA binning table and this too will require and IC gain history table to correct it New reference channels are also needed for JEM X2 to ensure that cool revolutions lie a little above 29 6keV and warm revolutions lie somewhat under this the difference between the two being less than 1 at the moment CAO will keep an eye on the JEM X2 evolution of temperature non linearities that will probably ar
6. g test the Xe line shape Radiation belt passage INTEGRAL is coming closer and closer to the proton belt and in revolution 1020 and after it will pass very close to the peak flux However the passage takes only 5 minutes and since the passage happens at belt entry and there is hope that the activation will have died off around exit at least for JEMX where we expect little activation with effects in the pertinent energy range News from ISDC and OSA8 comments SP People leaving Volker Beckmann to Paris Bruce O Neel to a private company Volker has been replaced by Carlo Ferrigno for the operations Enrico Bozzo is second operation manager New PhDs and Post Docs Andrii Neronov has been promoted to assistant professor Increase in the last year around 15 of personnel Piotr Lubinski has also left to Poland Thierry Courvoisier is away until June 2010 St phane Paltani is the ad interim substitute OSAS is working fine after a few now solved problems There have been no complaints OSA9 is pushed by Roland Walter for an ISGRI update where some glue is making unexpected shadows that are now mapped These pixels should be removed which gives a clear improvement People in Saclay want to make more tests Release date could be end of February 2010 but it is uncertain SP has started some hardware activity for Astro H the Japanese mission with respect to the calorimeter Similar activities have been started in the framework of XO for the c
7. ise as the instrument ages Some issues with OSA8 JC PSFsigma in j_ima_mosaic 0 1 is added to the input PSFSIGMA value for expected smearing but this is too simple 1 gt 1 mosaicking is possible The additional should increase proportionally or rather asymptotically with the number of combined images Should PSFsigma rather be a map together with the mosaic image Comment by SP The effect should be properly documented and quantified before any action is taken The current situation is not acceptable since mosaic_spec will give different results for the image and the mosaic in the case of a single ScW SP is of the opinion that the extra 0 1 should be removed for OSA9 A bug in j_ima_mosaic A problem appears when the user has given parameter diameter and asks for an exposure map but only when using the pre compiled executable from ISDC OSA8 SP suggests to run valgrind to check for memory overwriting and other loose ends Light curve extraction and gain correction do they work as expected IGR J19112 1358 shows a strange lightcurve The gain correction seems to depend on the existence of the file jmxi_gain_corr fits When it is not present jmxi_gain_scp fits will be produced SP there is an easy fix Detach dal_detach gain_scp the extension when running OSA Note after meeting Mathias Beck has identified that a change in j_cor_gain has had unforeseen consequences for the j_correction script since revolution
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