GTAC Observation Log 1. Date : 23/4/2013 2. Observation Sr. No. : 6462 3. Observer : Nissim Kanekar 4. Observer's Email : nkanekar@ncra.tifr.res.in 5. Project Name : SGRA 6. Project Code : 24_053 7. Operator(s) : Nilesh, Rupsingh, 8. Command File : /odisk/gtac/cmd/nissim/sgra.cmd 9. LTA File : /gsbifrdata/23apr/24_053_23apr2013.lta, /gsbifrdata/23apr/24_053_23apr2013.lta.1 10. LogFlag File : /odisk/online1/logflags/24_053.FLAGS, /odisk/online1/logflags/24_053.FLAGS.1, /odisk/online1/logflags/24_053.FLAGS.2, ANTENNA SETTINGS : 11. RF Band(MHz) & Solar Attn(dB)- RF1 : 306 MHz ,RF2 : 306 MHz, SA1 : 0 dB, SA2 : 0 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 : 10+12 dB, 32 MHz,ON, IF-CH2 : 10+12 dB, 32 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 : 32 MHz 21. Maximum Channels : 512 22. IFBW (MHz) : LO5 (KHz) : 32:149000-156000 23. Final Bandwidth (MHz): OFF MHz; Step # 0 24. Frequency Parameters (TPA) : 306 306 255 255 51 51. 25. Integration Time : 2.013 Sec. 26. No of Antennas Working(Fringing) :27 27. Name of Non-Working Antennas (with reason for each) : C04 : Node 32A -31B repairing work. E03 : Taken for BLDC work. S02 : Very low fringe @175 polarization. S06 : ABC time out. 28. Note for Backup :-- 29. Start and End Time of Obs.(IST): 00:20 - 08:10 30. ONLINE Machine : Shivneri 31. Comments (During Observations) : # 2S data file # /gsbifrdata1/23apr/24_053_23apr2013.lta, /gsbifrdata1/23apr/24_053_23apr2013.lta.1, -------------------------------------------------- 00:25 : Started scan on 3C286. 00:40 : Stopped scan. 00:48 : Started command file. 00:55 : Scan#1, Scan#3, and Scan#7 shows scintillation.(phase cal). 04:18 : Scan#9 shows no scintillation(phase cal). 07:03 : Stopped command file. Changed settings as follows : ALCs OFF. 14 dB Solar attenuator ON. RF : 325 MHz IF BW : 6 MHz Final BW : 4 MHz LO(1) : 255 255 MHz LO(4) : 67 MHz LO(5) : 133 172 MHz Step : 0 Correlator : Standard GSB lta 8m Channels : 512 TPA 322 322 255 255 67 67 07:10 : Started power eq @ 800 counts on SGRA. 07:25 : Power eq done. started scan on SGRA for ~21 min. 07:54 : Started scan on 3c48 for ~15min. 08:10 : Stopped observation session.