COVER INFORMATION Station: VLBA_LA (Code La ) Experiment: Confirming the first detection of a merging dual SMBH system at high-z Exp. Code: gs044a Schedule Version: 2.00 Processed by SCHED version: 11.50 Development version 11.5. Started Apr. 2 PI: Cristiana Spingola Address: University of Bologna - INAF-IRA via Gobetti 101 40129 Bologna Italy Phone: +39 3938231373 EMAIL: spingola@ira.inaf.it Fax: Phone during observation: Observing mode: Notes: v2: T6 IF C->B, BBC 9-12 -> 5-8 Ar confirms BBC tunings for their RDBE COVER LETTER: Schedule for VLBA_LA (Code La ) Page 2 Confirming the first detection of a merging dual SMBH system at high-z UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sat 26 Oct 2019 Day 299 --- Next scan frequencies: 4860.25 4860.25 4892.25 4892.25 4924.25 4924.25 4956.25 4956.25 Next BBC frequencies: 760.25 760.25 792.25 792.25 824.25 824.25 856.25 856.25 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 18 43 40 MG2016 13 58 06 2.3 77.4 -6.4 H -53.9 0 0 18 43 40 18 47 10 --- 14 01 36 3.0 77.9 -6.3 -54.1 0 27 18 43 41 18 48 50 MG2016 14 03 17 3.3 78.2 -6.3 -54.1 94 27 18 48 50 18 52 20 --- 14 06 47 4.0 78.7 -6.2 -54.3 210 54 18 48 51 18 52 20 J2018+0831 14 06 47 2.5 81.2 -6.2 H -54.2 -11 54 18 52 31 18 53 50 --- 14 08 17 2.8 81.4 -6.2 -54.2 0 64 18 52 21 18 53 50 MG2016 14 08 17 4.3 78.9 -6.2 -54.3 -11 64 18 54 01 18 57 20 --- 14 11 48 5.0 79.4 -6.1 -54.5 199 90 18 53 51 18 58 00 J2018+0831 14 12 28 3.7 82.0 -6.1 -54.4 29 90 18 58 00 18 59 00 --- 14 13 28 3.9 82.2 -6.1 -54.4 60 98 18 58 01 18 59 00 MG2016 14 13 28 5.4 79.6 -6.1 -54.5 -11 98 18 59 11 19 02 30 --- 14 16 59 6.1 80.1 -6.1 -54.7 199 123 18 59 01 19 02 30 J2018+0831 14 16 59 4.6 82.7 -6.0 -54.5 -11 123 19 02 41 19 04 00 --- 14 18 29 4.9 82.9 -6.0 -54.5 79 133 19 02 31 19 04 00 MG2016 14 18 29 6.4 80.4 -6.0 -54.7 -11 133 19 04 11 19 07 30 --- 14 22 00 7.1 80.9 -6.0 -54.8 199 159 19 04 01 19 08 10 J2018+0831 14 22 40 5.7 83.5 -5.9 -54.6 29 159 19 08 10 19 09 10 --- 14 23 40 5.9 83.7 -5.9 -54.6 60 167 19 08 11 19 09 10 MG2016 14 23 40 7.4 81.1 -5.9 -54.9 -11 167 19 09 21 19 12 40 --- 14 27 10 8.1 81.6 -5.9 -55.0 199 192 19 09 11 19 12 40 J2018+0831 14 27 10 6.6 84.2 -5.9 -54.7 -11 192 19 12 51 19 14 10 --- 14 28 41 6.9 84.4 -5.8 -54.7 79 203 19 12 41 19 14 10 MG2016 14 28 41 8.4 81.8 -5.9 -55.0 -11 203 19 14 21 19 17 40 --- 14 32 11 9.1 82.3 -5.8 -55.1 199 228 19 14 11 19 18 20 J2018+0831 14 32 51 7.8 85.0 -5.8 -54.8 29 228 19 18 20 19 19 20 --- 14 33 52 8.0 85.1 -5.8 -54.8 60 236 19 18 21 19 19 20 MG2016 14 33 52 9.4 82.5 -5.8 -55.2 -11 236 19 19 31 19 22 50 --- 14 37 22 10.1 83.0 -5.7 -55.3 199 262 19 19 21 Schedule for VLBA_LA (Code La ) Page 3 Confirming the first detection of a merging dual SMBH system at high-z UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sat 26 Oct 2019 Day 299 --- 19 22 50 J2018+0831 14 37 22 8.7 85.6 -5.7 -54.9 -11 262 19 23 01 19 24 20 --- 14 38 52 9.0 85.8 -5.7 -54.9 79 272 19 22 51 19 24 20 MG2016 14 38 52 10.4 83.3 -5.7 -55.3 -11 272 19 24 31 19 27 50 --- 14 42 23 11.2 83.8 -5.6 -55.4 199 297 19 24 21 19 28 30 J2018+0831 14 43 03 9.8 86.4 -5.6 -55.0 29 297 19 28 30 19 29 30 --- 14 44 03 10.0 86.6 -5.6 -55.0 60 305 19 28 31 19 36 10 MG2016 14 50 44 12.8 84.9 -5.5 -55.6 389 305 19 36 10 19 39 40 --- 14 54 15 13.6 85.4 -5.4 -55.6 210 332 19 36 11 19 39 40 J2018+0831 14 54 15 12.1 88.1 -5.4 -55.1 -11 332 19 39 51 19 41 10 --- 14 55 45 12.4 88.3 -5.4 -55.1 79 342 19 39 41 19 41 10 MG2016 14 55 45 13.9 85.7 -5.4 -55.7 -11 342 19 41 21 19 44 40 --- 14 59 16 14.6 86.2 -5.3 -55.7 199 368 19 41 11 19 45 20 J2018+0831 14 59 56 13.3 88.9 -5.3 -55.1 29 368 19 45 20 19 46 20 --- 15 00 56 13.5 89.0 -5.3 -55.1 60 376 19 45 21 19 46 20 MG2016 15 00 56 14.9 86.4 -5.3 -55.7 -11 376 19 46 31 19 49 50 --- 15 04 27 15.6 86.9 -5.3 -55.8 199 401 19 46 21 19 49 50 J2018+0831 15 04 27 14.2 89.5 -5.2 -55.1 -11 401 19 50 01 19 51 20 --- 15 05 57 14.5 89.8 -5.2 -55.1 79 412 19 49 51 19 51 20 MG2016 15 05 57 15.9 87.1 -5.2 -55.8 -11 412 19 51 31 19 54 50 --- 15 09 27 16.6 87.6 -5.2 -55.8 199 437 19 51 21 19 55 30 J2018+0831 15 10 07 15.3 90.4 -5.2 -55.1 29 437 19 55 30 19 56 30 --- 15 11 08 15.5 90.5 -5.1 -55.1 60 445 19 55 31 19 56 30 MG2016 15 11 08 17.0 87.9 -5.2 -55.8 -11 445 19 56 41 20 00 00 --- 15 14 38 17.7 88.4 -5.1 -55.9 199 471 19 56 31 20 00 00 J2018+0831 15 14 38 16.2 91.0 -5.1 -55.1 -11 471 20 00 11 20 01 30 --- 15 16 08 16.6 91.3 -5.0 -55.1 79 481 20 00 01 20 01 30 MG2016 15 16 08 18.0 88.6 -5.1 -55.9 -11 481 20 01 41 20 05 00 --- 15 19 39 18.7 89.1 -5.0 -55.9 199 506 20 01 31 20 05 40 J2018+0831 15 20 19 17.4 91.9 -5.0 -55.1 29 506 20 05 40 20 06 40 --- 15 21 19 17.6 92.0 -5.0 -55.1 60 514 20 05 41 Schedule for VLBA_LA (Code La ) Page 4 Confirming the first detection of a merging dual SMBH system at high-z UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sat 26 Oct 2019 Day 299 --- 20 06 40 MG2016 15 21 19 19.0 89.3 -5.0 -55.9 -11 514 20 06 51 20 10 10 --- 15 24 50 19.7 89.8 -4.9 -55.9 199 540 20 06 41 20 10 10 J2018+0831 15 24 50 18.3 92.5 -4.9 -55.1 -11 540 20 10 21 20 11 40 --- 15 26 20 18.6 92.8 -4.9 -55.0 79 550 20 10 11 20 11 40 MG2016 15 26 20 20.1 90.1 -4.9 -55.9 -11 550 20 11 51 20 15 10 --- 15 29 51 20.8 90.6 -4.8 -55.9 199 576 20 11 41 20 15 50 J2018+0831 15 30 31 19.5 93.4 -4.8 -55.0 29 576 20 15 50 20 16 50 --- 15 31 31 19.7 93.5 -4.8 -55.0 60 583 20 15 51 20 16 50 MG2016 15 31 31 21.1 90.8 -4.8 -55.9 -11 583 20 17 01 20 20 20 --- 15 35 02 21.8 91.3 -4.8 -55.9 199 609 20 16 51 20 20 20 J2018+0831 15 35 02 20.4 94.1 -4.7 -54.9 -11 609 20 20 31 20 21 50 --- 15 36 32 20.7 94.3 -4.7 -54.9 79 619 20 20 21 20 21 50 MG2016 15 36 32 22.1 91.6 -4.7 -55.9 -11 619 20 22 01 20 25 20 --- 15 40 02 22.8 92.1 -4.7 -55.8 199 645 20 21 51 20 26 00 J2018+0831 15 40 42 21.5 94.9 -4.6 -54.8 29 645 20 26 00 20 27 00 --- 15 41 43 21.7 95.1 -4.6 -54.8 60 652 20 26 01 20 27 00 MG2016 15 41 43 23.2 92.3 -4.6 -55.8 -11 652 20 27 11 20 30 30 --- 15 45 13 23.9 92.9 -4.6 -55.8 199 678 20 27 01 20 30 30 J2018+0831 15 45 13 22.4 95.6 -4.6 -54.7 -11 678 20 30 41 20 32 00 --- 15 46 43 22.7 95.9 -4.5 -54.7 79 688 20 30 31 20 32 00 MG2016 15 46 43 24.2 93.1 -4.6 -55.8 -11 688 20 32 11 20 35 30 --- 15 50 14 24.9 93.6 -4.5 -55.7 199 714 20 32 01 20 36 10 J2018+0831 15 50 54 23.6 96.5 -4.5 -54.6 29 714 20 36 10 20 37 10 --- 15 51 54 23.8 96.7 -4.5 -54.6 60 722 20 36 11 20 37 10 MG2016 15 51 54 25.2 93.9 -4.5 -55.7 -11 722 20 37 21 20 40 40 --- 15 55 25 25.9 94.4 -4.4 -55.6 199 747 20 37 11 20 41 20 J2018+0831 15 56 05 24.6 97.3 -4.4 -54.5 29 747 20 41 20 20 42 20 --- 15 57 05 24.8 97.5 -4.4 -54.4 60 755 20 41 21 20 42 20 MG2016 15 57 05 26.3 94.7 -4.4 -55.6 -11 755 20 42 31 20 45 50 --- 16 00 36 27.0 95.2 -4.3 -55.5 199 781 20 42 21 Schedule for VLBA_LA (Code La ) Page 5 Confirming the first detection of a merging dual SMBH system at high-z UP: D => Below limits; H => Below horizon mask; W => still slewing at end; blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Disk: GBytes recorded to this point. TPStart: Recording start time. Frequencies are LO sum (band edge). SYNC: Time correlator is expected to sync up. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Disk TPStart Stop UT LST EL AZ HA UP ParA Dwell GBytes SYNC ---------------------------------------------------------------------------------------- --- Sat 26 Oct 2019 Day 299 --- 20 45 50 J2018+0831 16 00 36 25.5 98.1 -4.3 -54.3 -11 781 20 46 01 20 47 20 --- 16 02 06 25.8 98.3 -4.3 -54.3 79 791 20 45 51 20 47 20 MG2016 16 02 06 27.3 95.4 -4.3 -55.5 -11 791 20 47 31 20 50 50 --- 16 05 37 28.0 96.0 -4.2 -55.4 199 816 20 47 21 20 51 30 J2018+0831 16 06 17 26.7 99.0 -4.2 -54.1 29 816 20 51 30 20 52 30 --- 16 07 17 26.9 99.1 -4.2 -54.1 60 824 20 51 31 20 52 30 MG2016 16 07 17 28.3 96.3 -4.2 -55.4 -11 824 20 52 41 20 56 00 --- 16 10 47 29.0 96.8 -4.2 -55.3 199 850 20 52 31 20 56 30 J2018+0831 16 11 17 27.7 99.8 -4.1 -54.0 19 850 20 56 30 21 00 00 --- 16 14 48 28.4 100.4 -4.1 -53.8 210 877 20 56 31 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess319.C1024glob Matching groups in /home/guest/rmc/SCHED/sched11.5/catalogs/freq_RDBE.dat: vc_d Setup group: 6 Station: VLBA_LA Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: RDBE_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 4100.00 Net SB= U U U U U U U U IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= U U U U U U U U IF = A C A C A C A C VLBA FE= 6cm omit 6cm omit VLBA Synth= 13.6 4.1 13.6 The following frequency sets based on these setups were used. See the crd files for VLBA legacy system setups and pcal detection details. Frequency Set: 15 Setup file default. Used with PCAL = off LO sum= 4860.25 4860.25 4892.25 4892.25 4924.25 4924.25 4956.25 4956.25 BBC fr= 760.25 760.25 792.25 792.25 824.25 824.25 856.25 856.25 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 VLBA legacy crd files using 4 channels based on RDBE channels: 3 4 5 6 CRD fr= 800.25 800.25 832.25 832.25 CRD bw= 16.00 16.00 16.00 16.00 Matching frequency sets: 15 16 18 19 20 21 22 23 24 Track assignments are: track1= 1, 2, 3, 4, 5, 6, 7, 8 barrel=roll_off POSITIONS OF SOURCES USED IN RECORDING SCANS Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * MG2016 20 16 55.378166 * 20 19 18.092000 20 20 13.565900 0.00 11 17 44.97966 * 11 27 13.00000 11 31 08.04992 0.00 From catalog imbedded in main SCHED input file. * 3C345 16 41 17.606162 * 16 42 58.809900 16 43 36.764649 0.00 39 54 10.81394 * 39 48 36.99300 39 46 42.73413 0.00 From catalog imbedded in main SCHED input file. * J2018+0831 20 15 45.733430 * 20 18 11.311946 20 19 07.886706 0.00 08 22 30.62230 * 08 31 54.54739 08 35 47.14317 0.00 From catalog imbedded in main SCHED input file. SOURCE SCAN SUMMARY FOR SOURCES LISTED ABOVE Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Setup file Frequency sets Observing hours (duplicates not shown) Scan Baseline MG2016 sess319.C1024glob 1 2 3 4 5 6 7 8 9 10 11 15 + 6.650 489.300 3C345 sess319.C1024glob 1 2 3 4 5 6 7 8 9 10 11 0.225 6.793 J2018+0831 sess319.C1024glob 1 2 3 4 5 6 7 8 9 10 11 15 + 2.525 164.241 EFFECT OF SOLAR CORONA The solar corona can cause unstable phases for sources too close to the Sun. SCHED provides warnings at individual scans for distances less than 10 degrees. The distance from the Sun to each source in this schedule is: Source Sun distance (deg) MG2016 96.6 3C345 64.2 J2018+0831 95.8 Barry Clark estimates from predictions by Ketan Desai of IPM scattering sizes that the Sun will cause amplitude reductions on the longest VLBA baselines at a solar distance of 60deg F^(-0.6) where F is in GHz. For common VLBI bands, this is: 327 MHz 117. deg 610 MHz 81. deg 1.6 GHz 45. deg 2.3 GHz 36. deg 5.0 GHz 23. deg 8.4 GHz 17. deg 15.0 GHz 12. deg 22.0 GHz 9. deg 43.0 GHz 6. deg