GTAC Observation Log 1. Date : 5/7/2013 2. Observation Sr. No. : 6589 3. Observer : Nissim Kanekar,Nirupam Roy 4. Observer's Email : nkanekar@ncra.tifr.res.in,nroy@aoc.nrao.edu 5. Project Name : Low-frequency observations of a gas cloud meeting the Galactic Centre black hole 6. Project Code : 24_053 7. Operator(s) : Navanath,Pramod,Surender 8. Command File : /odisk/gtac/cmd/nissim/sgra.cmd 9. LTA File : /gsbifrdata/05jul//24_053_05jul2013_16s.lta,/gsbifrdata1/05jul//24_053_05jul2013_2s.lta, 10. LogFlag File : /odisk/online1/logflags/24_053.FLAGS.26, ANTENNA SETTINGS : 11. RF Band(MHz) & Solar Attn(dB)- RF1 : 591 MHz ,RF2 : 591 MHz, SA1 : 0 dB, SA2 : 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. GSB CTRL : ONLINE 17. GSB Fstop : ON 18. GAIN EQ : OFF, 19. Stokes : TotIntensity 20. Beam - 1 : OFF 21. Beam - 2 : OFF 22. ACQ BW : 33.33 MHz 23. Final BW : 33.333333 MHz; Step # 0 24. Maximum Channels : 512 25. Channel Numbers : 0:511:1 26. LO5 -1 : 149.00 27. LO5 -2 : 156.00 28. Frequency Parameters (TPA) : 591 591 540 540 51 51. 29. Integration Time : 16.106112 Sec. 30. No of Antennas Working(Fringing) :27 31. Name of Non-Working Antennas (with reason for each) : E05 : BLDC. W03 : No fringe. W05 : No fringe. 32. Note for Backup : 33. Start and End Time of Obs.(IST): 21:00 - 03:06 34. ONLINE Machine : 35. Comments (During Observations) : 21:00 : Started set up. 21:14 : Power eq done on sgra around 400 count. 21:19 : Started scan on 3C286 for ~10min. 21:35 : Started command file. 02:43 : Stopped command file. 02:51 : Started scan on 3C48. 03:06 : Stopped scan on 3C48 duo to wind speed high and observation session is over.