GTAC Observation Log 1. Date : 04/6/2013 2. Observation Sr. No. : 6531 3. Observer : Nissim Kanekar 4. Observer's Email : nkanekar@ncra.tifr.res.in 5. Project Name : Low-frequency observations of a gas cloud meeting the Galactic Centre black hole 6. Project Code : 24_053 7. Operator(s) : Pramod, 8. Command File : /odisk/gtac/cmd/nissim/sgra.cmd 9. LTA File : /gsbifrdata/04jun/24_053_04jun2013.lta 10. LogFlag File : /odisk/online1/logflags/24_053.FLAGS.17 ANTENNA SETTINGS : 11. RF Band(MHz) & Solar Attn(dB)- RF1 : 591 MHz ,RF2 : 591 MHz, SA1 : 0 dB, SA2 : 0 dB 12. Ist LO (MHz) & IVth LO (MHz): ILO1 : 540 MHz, ILO2 : 540 MHz , IVLO1 : 51 MHz, IVLO2 : 51 MHz 13. IF Attn(dB) , IF BW(MHz) & IF ALC : IF-CH1 : 24+4 dB, 32 MHz,OFF, IF-CH2 : 24+4 dB, 32 MHz,OFF GSB SETTINGS : 14. GSB Mode : RealTime 15. GSB LTA : 8 16. GAIN EQ : OFF 17. Stokes : Total_Intensity 18. Beam - 1 : OFF 19. Beam - 2 : OFF 20. ACQ BW : 32 MHz 21. Maximum Channels : 512 22. IFBW (MHz) : LO5 (KHz) : 32:149000-156000 23. Final Bandwidth (MHz): OFF MHz; Step # 0 24. Frequency Parameters (TPA) : 591 591 540 540 51 51. 25. Integration Time : 16.106 Sec. 26. No of Antennas Working(Fringing) :26 27. Name of Non-Working Antennas (with reason for each) : C00 : Servo problem. C10 : ABC Return link time out. C12 : MCM 14 time out. E03 : BLDC work. 28. Note for Backup :-- 29. Start and End Time of Obs.(IST): 23:00 - 05:33 30. ONLINE Machine : Shivneri 31. Comments (During Observations) : 2 second recording file '/gsbifrdata1/04jun/24_053_04jun2013_2s.lta' ----------------------------------------------------------------------------------------- 23:00 : Started set up for 610MHz. 23:21 : Power equalised done on sgra @ 400 counts. 23:29 : Started scan on 3C286. 23:38 : Stopped scan on 3C286 and started following command file. '/odisk/gtac/cmd/nissim/sgra.cmd' 04:07 : Servo problem for W02. 04:53 : Stopped command file. 05:01 : Started scan on 3C48. 05:33 : Stopped scan on 3C48 and observation session is over.