GTAC Observation Log 1. Date : 3/8/2013 2. Observation Sr. No. : 6640 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/03aug/24_053_03aug2013.lta,/gsbifrdata1/03aug/24_053_03aug2013_2s.lta, 10. LogFlag File : /odisk/online1/logflags/24_053.FLAGS.26, ANTENNA SETTINGS : 11. RF Band(MHz) & Solar Attn(dB)- RF1 : 306 MHz ,RF2 : 306 MHz, SA1 : 0 dB, SA2 : dB 12. Ist LO (MHz) & IVth LO (MHz): ILO1 : 255 MHz, ILO2 : 255 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 : ON 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) : 306 306 255 255 51 51. 29. Integration Time : 16.106112 Sec. 30. No of Antennas Working(Fringing) :26 31. Name of Non-Working Antennas (with reason for each) : E05: BLDC W04: Servo problem. C08 and C12 : Electrical problem. 32. Note for Backup : 33. Start and End Time of Obs.(IST): 18:10 - 01:35 34. ONLINE Machine : Shivneri 35. Comments (During Observations) : 18:10 : Started set-up. 18:32 : Power eq done on 3C286 at 300counts. 18:35 : Halt the GSB started with GAIN ON. 18:37 : Started command file. 01:05 : Started scan on flux cal. 01:35 : Observing session over. -------------------------------------