GTAC Observation Log 1. Date : 22/07/2010 2. Observation Sr. No. : 4974 3. Observer : Sandeep Sirothia 4. Observer's Email : sirothia@ncra.tifr.res.in,ishwar@ncra.tifr.res.in,ngk@ncra.tifr.res.in 5. Project Name : Extra Galactic Survey @ 150 MHz Using GMRT 6. Project Code : 18_031 7. Operator(s) : Amruta, Navanath, Nilesh, Sachin, Shilpa 8. Command File : /odisk/gtac/cmd/sirothia/18_031_20100722.loop1.cmd, /odisk/gtac/cmd/sirothia/18_031_20100722.loop2to5.cmd 9. LTA File : /rawdata/22jul/18_031_22jul2010.lta, /rawdata1/22jul/18_031_22jul2010.ltb, 10. GSB File : /gsbifrdata/22jul/18_031_22jul2010_gsb.lta, 11. LogFlag File : /odisk/online1/logflags/18_031.FLAGS.74 ANTENNA SETTINGS : 12. RF Freq(MHz) & Solar Attn(dB)- RF1 : 156 MHz ,RF2 : 156 MHz, SA1 : 14 dB, SA2 : 14 dB 13. Ist LO (MHz) & IVth LO (MHz) : ILO1 : 218 MHz, ILO2 : 218 MHz, IVLO1 : 62 MHz, IVLO2 : 62 MHz 14. IF Attn(dB) , IF BW(MHz) & IF ALC : IF-CH1 : 4+12 dB, 16 MHz,ON, IF-CH2 : 4+12 dB, 16 MHz,ON 15. BB BW(KHz) & BB ALC : 16000 KHz, ON CORRELATOR SETTINGS : 16. Channels : 0:127:1 17. Frequency Parameters (TPA) : 156 156 218 218 62 62 18. Integration Time : 16 LTA ~ 2.114 Sec. 19. No of Antennas Working(Fringing) :26 20. Name of Non-Working Antennas (with reason for each) : C08 : Maintenance. E04 : RFI lines @ bingining. E06 : ABC Time-out. W04 : servo problem. 21. Note for Backup :-- 22. Start and End Time of Obs.(IST): 17:15 - 07:35 23. ONLINE Machine : Shivneri 24. Correlator Mode : UsbPolar 25. Comments (During Observations) : ------------------------------------------------- GSB settings : Full Stokes ACQ BW : 16MHz. Final BW : OFF. 256 channels. ------------------------------------------------- 2s Data Files : /rawdata/22jul/18_031_22jul2010_2s.lta, /rawdata1/22jul/18_031_22jul2010_2s.ltb, /gsbifrdata1/22jul/18_031_22jul2010_2s_gsb.lta, ------------------------------------------------- 17:15 : Started setup. 17:40 : Started scan on 3C286. 18:00 : RFI @ E04 antenna vanished. 18:11 : Stopped scan. 18:12 : C08 Released for observation 18:18 : Started command file. /odisk/gtac/cmd/sirothia/18_031_20100722.loop1.cmd. 18:47 : Electrical power failure. 18:55 : Electrical power resumed. Started setup. Note : scan# 8 to scan#13 are affected by power failure. 19:15 : Setup finished. antennas started working. 20:49 : C06 ABC time-out. 20:59 : '/odisk/gtac/cmd/sirothia/loop2to5.cmd' command file started. 21:30 : Power glitch. C02,E04 got reset. and most of the antennas applied brakes. scan#48 is bad. C03 and W02 : Servo problems. 02:35 : S01 abc timeout. 04:36 : Scan no. 155,156.157 bad.(source set) R57D52,R58D53 are removed from command file. 06:53 : Stopped command file. 07:14 : Stated scan on 3c147 for 20min. 07:35 : Observation session over. -------------------------------------------------