GTAC Observation Log 1. Date : 22/2/2014 2. Observation Sr. No. : 6971 3. Observer : Nirupam Roy,Nissim Kanekar 4. Observer's Email : roy.nirupam@gmail.com,nkanekar@ncra.tifr.res.in 5. Project Name : Low-frequency observations of a gas cloud meeting the Galactic Centre black hole 6. Project Code : 25_082 7. Operator(s) : Surender 8. Command File : /odisk/gtac/cmd/nissim/sgra.cmd 9. LTA File : /gsbifrdata/22feb/25_082_22feb2014.lta,/gsbifrdata/22feb/25_082_22feb2014_8s.lta, 10. LogFlag File : /odisk/online1/logflags/25_082.FLAGS.4, 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. GSB CTRL : ONLINE 17. GSB Fstop : ON 18. GAIN EQ : OFF 19. Stokes : TotalIntensity 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) at the begining :28 31. Name of Non-Working Antennas (with reason for each) : C09 : feed problem. E06 : no fringe @130 pol. 32. Note for Backup : 33. Start and End Time of Obs.(IST): 05:00 - 12:04 34. ONLINE Machine : Lenyadri 35. No of Antennas Working(Fringing) at the end :26 36. Comments (During Observations) : 05:00 : Stared set-up. 05:26 : power eq done on SGRA 05:34 : Started scan on 3c286 for 5min. 05:40 : Started command file. 08:22 : E06 started giving time out. 08:30 : W02 taken for painting. 11:40 : stopped scan 11:54 : started scan on 3C48. 12:04 : stopped das & observation session.