GTAC Observation Log 1. Date : 23/3/2013 2. Observation Sr. No. : 6435 3. Observer : Dharam Vir Lal 4. Observer's Email : dharam@ncra.tifr.res.in,tventuri@ira.inaf.it 5. Project Name : Abell 2142's cold fronts and giant radio halo: a case of extremes 6. Project Code : 23_017 7. Operator(s) : Deepak, Navanath, Pramod, Sachin, Shilpa, Surender 8. Command File : /odisk/gtac/cmd/dharam/23_017_23mar13.cmd 9. LTA File : /gsbifrdata/23mar/23_017_23mar2013.lta 10. LogFlag File : /odisk/online1/logflags/23_017.FLAGS.1 ANTENNA SETTINGS : 11. RF Band(MHz) & Solar Attn(dB)- RF1 : 242 MHz ,RF2 : 242 MHz, SA1 : 14 dB, SA2 : 14 dB 12. Ist LO (MHz) & IVth LO (MHz): ILO1 : 304 MHz, ILO2 : 304 MHz , IVLO1 : 62 MHz, IVLO2 : 62 MHz 13. IF Attn(dB) , IF BW(MHz) & IF ALC : IF-CH1 : 10+12 dB, 16 MHz,ON, IF-CH2 : 10+12 dB, 16 MHz,ON GSB SETTINGS : 14. GSB Mode : RealTime 15. GSB LTA : 8 16. GAIN EQ : ON 17. Stokes : Total_Intensity 18. Beam - 1 : OFF 19. Beam - 2 : OFF 20. ACQ BW : 16 MHz 21. Maximum Channels : 256 22. IFBW (MHz) : LO5 (KHz) : 16:138000-167000 23. Final Bandwidth (MHz): OFF MHz; Step # 0 24. Frequency Parameters (TPA) : 242 242 304 304 62 62. 25. Integration Time : 8.053 Sec. 26. No of Antennas Working(Fringing) :27 27. Name of Non-Working Antennas (with reason for each) : C04 : Counter weight replacement. W02 : BLDC work. S04 : Electrical problem cable fault. 28. Note for Backup :-- 29. Start and End Time of Obs.(IST): 22:10 - 09:18 30. ONLINE Machine : Lenyadri 31. Comments (During Observations) : 22:10 : Started set up for 235MHz. 22:17 : Started scan on 3C286. 23:10 : Started command file. 01:37 : Command file stopped. 01:39 : Started scan on 3C286 for 10mins. 01:53 : Restarted command file. 04:21 : Command file stopped. 04:33 : Started scan on 3C286 for 10mins. 04:46 : Restarted command file. 08:13 : C12 taken for painting. 08:56 : Stopped command file. 09:02 : Started scan on 3C48. 09:18 : Stopped scan and observing session over.