GTAC Observation Log 1. Date : 19/07/2021 2. Observation Sr. No. : 13307 3. Observer : BHAL CHANDRA JOSHI, Yashwant Gupta, Manjari Bagchi, Gopakumar Achamveedu, Shantanu Desai, Prabu Thiagaraj, Abhimanyu Susobhanan, Dhruv Pathak, Lankeswar Dey, Jaikhomba Singha, Arpita Choudhary, Neelam Dhanda Batra, Krishnakumar MA, Yogesh Maan, Mayuresh Surnis, Suryarao Bethapudi, ARUN KUMAR NAIDU, SAICHAITANYA SUSARLA, Avishek kumar Basu, Nobleson Kunjappy, Raghav Prafulla Girgaonkar, Kishalay De, Periasamy K. Manoharan, Subhajit Dandapat, Nikita Agarwal 4. Observer\'s Email : bcj@ncra.tifr.res.in, ygupta@ncra.tifr.res.in, manjari.bagchi@gmail.com, gopu.tifr@gmail.com, shntn05@gmail.com, prabu@rri.res.in, s.abhimanyu@tifr.res.in, pathakdhruv9786@gmail.com, LANKY441@GMAIL.COM, mjaikhomba@gmail.com, arp.astro@gmail.com, neelam.dhanda@gmail.com, kk.ambalappat@gmail.com, maan@astron.nl, mayuresh.surnis@mail.wvu.edu, ep14btech11008@iith.ac.in, arun@ncra.tifr.res.in, saichaitanya16@iisertvm.ac.in, avishek@ncra.tifr.res.in, nobleson.phy@gmail.com, ep17btech11016@iith.ac.in, kde@caltech.edu, mano@ncra.tifr.res.in, subhajit.phy97@gmail.com, nikitaagar2503@gmail.com 5. Project Name : Indian Pulsar Timing Array (InPTA) experiment using the upgraded wideband GMRT : 2021 Update 6. Project Code : 40_012 7. Operator(s) : Sachin, Shriram, Surender 8. Command File : /odisk/gtac/cmd 9. LTA File : /gwbifrdata1/18jul/40_012_18jul2021_band5_gwb.lta, /gwbifrdata2/18jul/40_012_18jul2021_band3_gwb.lta 10. LogFlag File : ANTENNA SETTINGS : 11. RF Band(MHz) & Solar Attn(dB)- RF1 : 1409 MHz ,RF2 : 1409 MHz, SA1 : 0 dB, SA2 : 0 dB 12. Ist LO (MHz) & IVth LO (MHz): ILO1 : 1460 MHz, ILO2 : 1460MHz , 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 : Total_Intensity 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) : 1409 1409 1460 1460 51 51 30. Integration Time : 4.0265 Sec 31. No of Antennas Working(Fringing) at the beginning :27 32. Name of Non-Working Antennas (with reason for each) : C03 : Mechanical Work. C05 : : No fringe. C12: Servo problem 33. Note for Backup : 34. Start and End Time of Obs.(IST): 18 Jul 2021 17:00:00 - 19 Jul 2021 02:00:00 35. ONLINE Machine : TGC 36. No of Antennas Working(Fringing) at the end :27 37. RFI Status :Intermittant RFI in band 3 38. Comments (During Observations) : ------------GWB Setting--------- GPU_MODE : Realtime GPU_LTA : 8 GPU_ACQ_BW : 200.0000 GPU_FINAL_BW : 200 GPU_EDGE_FRQ : 0 GPU_CHAN_MAX : 1024 GPU_CHAN_NUM : 0:1023:1 GPU_STOKES : Total_Intensity GPU_SIDEBAND : -1 -1 GPU_RF3 : 500 500 GPU_DDCLO3 : 0.000000 0.000000 GPU_SB3 : -1 -1 GCODE3 : 40_012B GPU_RF4 : 1460 1460 GPU_DDCLO4 : 0.0000 0.0000 GPU_SB4 : -1 -1 GCODE4 : 40_012A GPU_CNTRL : ONLINE/TGC GPU_FSTOP : ON GPU_BEAM_1 : OFF GPU_BEAM_2 : VOLTAGE GPU_BEAM_3 : PA GPU_BEAM_4 : OFF GPU_BM_INT : 8 GPU_GAINEQ : ON GPU_TPA : From online/TGC tpa GPU_BITS : 8 Bits GPU_FILRFI : RFI Filterring OFF GPU_BEAM_S : OFF GPU_PFB : OFF GPU_PFB_TAPS : 4 GPU_BEAM_BIT : 16 GPU_VLT_BIT : 8 GPU_ENV : RELEASED -------------------------------------------------------------------------- # GWB GAC configuration is as follows : # BEAM-2:130 :: C01 C02 C06 C08 C09 C11 C14 Total=7 # BEAM-2:175 :: C01 C02 C06 C08 C09 C11 C14 Total=7 # BEAM-3:130 :: C00 C04 C10 C13 E02 E03 E04 S01 S02 S03 S04 W01 W02 W03 W04 Total=15 # BEAM-3:175 :: C00 C04 C10 C13 E02 E03 E04 S01 S02 S03 S04 W01 W02 W03 W04 Total=15 -------------------------------------------------------------------------- 17:00 : Started settings. 17:30 : Power equalized on 3C286. 17:40 : Phasing done on 3C286. 17:45 : Started command file, \'/data1/gtac/cmd/40_012/18jul2021.py\' 17:57 : Power failure at South arm. Command file stopped. 18:04 : Power recovered. Restarted command file. 18:50 : power failure at south arm. S03 removed from GAC as not shifted to GEN-set power. restarted scan for sub-4. -------------------------------------------------------------------------- 19:06 : Phasing not done in band 3 due to RFI. Hence did the phasing manually. But still not phased. After discussing with observer, changed phase cal to 1419+064 and checked phasing manually. Phasing was good at band-5, but band 3 still not phased due to RFI. 19:39 : resumed command file with next target J1643-1224. 20:24 : C04 removed from GAC due to bad phasing. 21:22 : S03 and C04 added back to GAC. 23:00 : Data directory changed in GWBH8 from data6 to data4. 00:41 : Observed that source is transiting and it wiil take more time. So stopped command file and moved on phase cal. But it gave slewing problem for many antennas. Antennas were not taking commands. 01:06 : STarted command file. 02:00 : Completed on-off on 3C48 and closed observation session.