GTAC Observation Log 1. Date : 23/05/2009 2. Observation Sr. No. : 4305 3. Observer : Ramana Athreya, Rahul Basu 4. Observer's Email : rathreya@ncra.tifr.res.in,rbasu@ncra.tifr.res.in 5. Project Name : Mapping the Spectral Index of Galaxy Cluster Radio Halos. 6. Project Code : 16_259 7. Operator(s) : Deepak, Nilesh, Santaji, 8. Command File : /odisk/gtac/cmd/ 9. LTA File : /rawdata/23may/16_259_23may2009.lta, /rawdata/23may/16_259_23may2009_2s.lta 10. LogFlag File : /odisk/online1/logflags/16_259.FLAGS ANTENNA SETTINGS : 11. RF Freq(MHz) & Solar Attn(dB)- RF1 : 157 MHz ,RF2 : 157 MHz, SA1 : 14 dB, SA2 : 14 dB 12. Ist LO (MHz) & IVth LO (MHz) : ILO1 : 223 MHz, ILO2 : 223 MHz, IVLO1 : 66 MHz, IVLO2 : 66 MHz 13. IF Attn(dB) , IF BW(MHz) & IF ALC : IF-CH1 : 4+12 dB, 6 MHz,ON, IF-CH2 : 4+12 dB, 6 MHz,ON 14. BB BW(KHz) & BB ALC : 8000 KHz, ON CORRELATOR SETTINGS : 16. Channels : 0:127:1 17. Frequency Parameters (TPA) : 157 157 223 223 66 66 18. Integration Time : 16 LTA ~ 2.114 Sec. 19. No of Antennas Working(Fringing) :27 20. Name of Non-Working Antennas (with reason for each) : C12 : Phase not stable/ Phase jumps. E06 : ABC time-out. 21. Note for Backup : -- 22. Start and End Time of Obs.(IST): 21:00 - 05:45 23. ONLINE Machine : Shivneri 24. Correlator Mode : IndianPolar 25. Comments (During Observations) : 21:05 : Started settings. 21:20 : Started scan on 3c286 for 10 min. 21:40 : Started command file '/odisk/gtac/cmd/16_259/16_259_23may.cmd'. 05:18 : Stopped the command file. 05:25 : scan started on 3c48. 05:45 : stopped the scan. 05:45 : observation session over.