GTAC Observation Log 1. Date : 24/05/2023 2. Observation Sr. No. : 15439 3. Observer : harish k vedantham, Sanne Bloot 4. Observer\'s Email : vedantham@astron.nl, bloot@astron.nl 5. Project Name : A volume limited survey of the coldest brown dwarfs- a bridge to exoplanet magnetism 6. Project Code : 44_108 7. Operator(s) : Pramod 8. Command File : /odisk/gtac/cmd 9. LTA File : /gsbifrdata/24may/44_108_24may2023_b4_gsb.lta.5, /gsbifrdata/24may/44_108_24may2023_b4_gsb.lta.4, /gsbifrdata/24may/44_108_24may2023_b4_gsb.lta.3, /gsbifrdata/24may/44_108_24may2023_b4_gsb.lta.2, /gsbifrdata/24may/44_108_24may2023_b4_gsb.lta.1, /gsbifrdata/24may/44_108_24may2023_b4_gsb.lta, /gsbifrdata1/24may/44_108_24may2023_b4_gsb.lta.1, /gsbifrdata1/24may/44_108_24may2023_b4_gsb.lta, /gwbifrdata1/24may/44_108_24may2023_b4_gwb.lta.6, /gwbifrdata1/24may/44_108_24may2023_b4_gwb.lta.5, /gwbifrdata1/24may/44_108_24may2023_b4_gwb.lta.4, /gwbifrdata1/24may/44_108_24may2023_b4_gwb.lta.3, /gwbifrdata1/24may/44_108_24may2023_b4_gwb.lta.2, /gwbifrdata1/24may/44_108_24may2023_b4_gwb.lta.1, /gwbifrdata1/24may/44_108_24may2023_b4_gwb.lta, /gwbifrdata2/24may/44_108_24may2023_b4_gwb.lta.1, /gwbifrdata2/24may/44_108_24may2023_b4_gwb.lta 10. LogFlag File : ANTENNA SETTINGS : 11. RF Band(MHz) & Solar Attn(dB)- RF1 : 591 MHz ,RF2 : 591 MHz, SA1 : 0 dB, SA2 : 0 dB 12. Ist LO (MHz) & IVth LO (MHz): ILO1 : 540 MHz, ILO2 : 540MHz , IVLO1 : 51 MHz, IVLO2 : 51 MHz 13. IF Attn(dB) , IF BW(MHz) & IF ALC : IF-CH1 : 4+14 dB, 32 MHz,ON, IF-CH2 : 4+14 dB, 32 MHz,ON GSB SETTINGS : 14. GSB Host : gsbm1_shivneri 15. GSB Mode : Realtime 16. GSB LTA : 8 17. GSB CTRL : ONLINE/TGC 18. GSB Fstop : ON 19. GAIN EQ : ON 20. Stokes : Full_Stokes 21. Beam - 1 : OFF 22. Beam - 2 : OFF 23. ACQ BW : 33.333333 MHz 24. Final BW : 0 MHz; Step # 0 25. Maximum Channels : 256 26. Channel Numbers : 0:255:1 27. LO5 -1 : 149 28. LO5 -2 : 156 29. Frequency Parameters (TPA) : 591 591 540 540 51 51 30. Integration Time : 2.0132 Sec 31. No of Antennas Working(Fringing) at the beginning :30 32. Name of Non-Working Antennas (with reason for each) : 33. Note for Backup : 34. Start and End Time of Obs.(IST): 24 May 2023 01:00:00 - 24 May 2023 07:00:00 35. ONLINE Machine : TGC 36. No of Antennas Working(Fringing) at the end :30 37. RFI Status : 38. Comments (During Observations) : ******************************************************************* Important Note for Observer: The refurbishment work of the W02 antenna reflector surface is currently in progress. The refurbishment of the inner sectors will commence from 16th May 2023 onwards. Please note that this ongoing work may affect the sensitivity of the antenna and could also alter the primary beam pattern depending on the size of the holes present on the surface. We advise exercising caution in using the antenna, particularly if your targets are extended or if you are using a wide field. ******************************************************************* ------------GWB Setting--------- GPU_MODE : Realtime GPU_LTA : 4 GPU_ACQ_BW : 400.0000 GPU_FINAL_BW : 400 GPU_EDGE_FRQ : 0 GPU_CHAN_MAX : 4096 GPU_CHAN_NUM : 0:4095:1 GPU_STOKES : Full_Stokes GPU_SIDEBAND : 1 1 GPU_RF4 : 550 550 GPU_DDCLO4 : 0.0000 0.0000 GPU_SB4 : 1 1 GCODE4 : 44_108 GPU_CNTRL : ONLINE/TGC GPU_FSTOP : ON GPU_BEAM_1 : OFF GPU_BEAM_2 : OFF GPU_BEAM_3 : OFF GPU_BEAM_4 : OFF GPU_BM_INT : 8 GPU_GAINEQ : ON GPU_TPA : From online/TGC tpa GPU_BITS : 4 Bits GPU_FILRFI : RFI Filterring OFF GPU_BEAM_S : OFF GPU_PFB : ON GPU_PFB_TAPS : 4 GPU_BEAM_BIT : 16 GPU_VLT_BIT : 8 GPU_WALSH : OFF GPU_ENV : RELEASED -------------------------------- 01:00 : Started set up. 01:15:23 : Started scan on 3C286 for ~ 10.2005 min. 01:31:24 : Started scan on 1759+237 for ~ 1.2527 min. 01:34:43 : Started scan on J1741+2553 for ~ 2.68435 min. 01:35 : GWB ACQ killed.Hence restarted GWB. 01:54:44 : Started scan on 1759+237 for ~ 1.20796 min. 01:58:10 : Started scan on J1741+2553 for ~ 27.962 min. 02:24 : GWB ACQ killed.Hence restarted GWB. 02:35:11 : Started scan on 1759+237 for ~ 1.16322 min. 02:38:03 : Started scan on J1741+2553 for ~ 30.02 min. 03:05 : GWB ACQ killed.Hence restarted GWB. 03:18:15 : Started scan on 1759+237 for ~ 1.20796 min. 03:20:54 : Started scan on J1741+2553 for ~ 25.8145 min. 03:44 : GWB ACQ killed.Hence restarted GWB. 03:55:20 : Started scan on 1759+237 for ~ 1.20796 min. 03:57:58 : Started scan on J1741+2553 for ~ 37.4914 min. 04:33 : GWB ACQ killed.Hence restarted GWB. 05:19:15 : Started scan on 1759+237 for ~ 1.16322 min. 05:21:48 : Started scan on J1741+2553 for ~ 29.3937 min. 05:49 : GWB ACQ killed.Hence restarted GWB. 06:31:18 : Started scan on 1759+237 for ~ 1.20796 min. 06:38:43 : Started scan on 3C48 for ~ 10.1111 min. 06:51:05 : Started scan on 3C84 for 10.1111 min. 07:00 : Stopped scan and observation session is over.