COVER INFORMATION Station: IRBENE (Code Ir ) Experiment: Varstrometry selected dual-Quasar candidates Exp. Code: EX010B Schedule Version: 2.00 Processed by SCHED version: 11.60 Release 11.6; April 2020 PI: Wancheng Xu Address: Xinjiang Astronomical Observatory, CAS 150 Science-1 Street Urumqi China Phone: +8615141589572 EMAIL: xuwancheng@xao.ac.cn Fax: Phone during observation: +8615141589572 Observing mode: vlbi Notes: # Please, make sure PHASE CAL is OFF # COVER LETTER: The coordinates of calibrators are from Astrogeo Database (rfc_2023c). Schedule for IRBENE (Code Ir ) Page 2 Varstrometry selected dual-Quasar candidates 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 25 May 2024 Day 146 --- Next scan frequencies: 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 Next BBC frequencies: 276.49 276.49 276.49 276.49 340.49 340.49 340.49 340.49 Next scan bandwidths: 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 14 30 00 J0927+3902 08 12 05 67.6-222.0 -1.3 -27.5 0 0 14 30 00 14 35 00 --- 08 17 06 68.1-219.7 -1.2 -26.1 300 39 14 30 01 14 36 10 J0941+4336 08 18 16 70.7-232.4 -1.4 -35.9 60 39 14 36 10 14 38 40 --- 08 20 47 71.0-231.3 -1.4 -35.2 150 58 14 36 11 14 39 20 J0950+4329S 08 21 27 70.0-234.8 -1.5 -37.1 35 58 14 39 20 14 46 00 --- 08 28 08 70.7-231.9 -1.4 -35.5 400 109 14 39 21 14 46 40 J0941+4336 08 28 48 71.8-227.5 -1.2 -33.0 35 109 14 46 40 14 48 40 --- 08 30 48 72.0-226.5 -1.2 -32.4 120 125 14 46 41 14 49 20 J0950+4329S 08 31 28 71.0-230.4 -1.3 -34.6 35 125 14 49 20 14 56 00 --- 08 38 10 71.7-227.2 -1.2 -32.8 400 176 14 49 21 14 56 40 J0941+4336 08 38 50 72.8-222.4 -1.1 -29.9 35 176 14 56 40 14 58 40 --- 08 40 50 72.9-221.3 -1.0 -29.2 120 192 14 56 41 14 59 20 J0950+4329S 08 41 30 72.0-225.5 -1.2 -31.8 35 192 14 59 20 15 06 00 --- 08 48 11 72.6-222.1 -1.1 -29.7 400 243 14 59 21 15 06 40 J0941+4336 08 48 51 73.6-216.8 -0.9 -26.3 35 243 15 06 40 15 08 40 --- 08 50 52 73.8-215.7 -0.9 -25.6 120 259 15 06 41 15 09 20 J0950+4329S 08 51 32 72.9-220.3 -1.0 -28.5 35 259 15 09 20 15 16 00 --- 08 58 13 73.5-216.6 -0.9 -26.1 400 310 15 09 21 15 16 40 J0941+4336 08 58 53 74.4-210.8 -0.7 -22.3 34 310 15 16 40 15 18 40 --- 09 00 53 74.5-209.6 -0.7 -21.4 120 326 15 16 41 15 19 20 J0950+4329S 09 01 33 73.8-214.6 -0.8 -24.8 34 326 15 19 20 15 26 00 --- 09 08 14 74.2-210.6 -0.7 -22.1 400 377 15 19 21 15 26 40 J0941+4336 09 08 55 75.0-204.4 -0.6 -17.8 34 377 15 26 40 15 28 40 --- 09 10 55 75.1-203.0 -0.5 -16.8 120 393 15 26 41 15 29 20 J0950+4329S 09 11 35 74.5-208.5 -0.7 -20.6 34 393 15 29 20 15 36 00 --- 09 18 16 74.9-204.1 -0.6 -17.6 400 444 15 29 21 15 36 40 J0941+4336 09 18 56 75.5-197.5 -0.4 -12.8 34 444 15 36 40 15 38 40 --- 09 20 57 75.5-196.1 -0.4 -11.8 120 460 15 36 41 Schedule for IRBENE (Code Ir ) Page 3 Varstrometry selected dual-Quasar candidates 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 25 May 2024 Day 146 --- 15 39 30 J0950+4329S 09 21 47 75.0-201.8 -0.5 -15.9 44 460 15 39 30 15 45 50 --- 09 28 08 75.3-197.4 -0.4 -12.8 380 509 15 39 31 15 46 40 J0941+4336 09 28 58 75.8-190.3 -0.2 -7.6 44 509 15 46 40 15 48 40 --- 09 30 58 75.8-188.8 -0.2 -6.5 120 524 15 46 41 15 49 30 J0950+4329S 09 31 48 75.5-194.8 -0.3 -10.9 44 524 15 49 30 15 55 50 --- 09 38 09 75.7-190.2 -0.2 -7.5 380 573 15 49 31 15 56 40 J0941+4336 09 38 59 75.9-182.9 -0.1 -2.1 44 573 15 56 40 15 58 40 --- 09 41 00 76.0-181.4 -0.0 -1.0 120 589 15 56 41 15 59 30 J0950+4329S 09 41 50 75.7-187.6 -0.2 -5.6 44 589 15 59 30 16 05 50 --- 09 48 11 75.8-182.9 -0.1 -2.1 380 638 15 59 31 16 06 40 J0941+4336 09 49 01 75.9-175.4 0.1 3.4 44 638 16 06 40 16 08 40 --- 09 51 01 75.9-173.9 0.1 4.5 120 653 16 06 41 16 09 30 J0950+4329S 09 51 52 75.8-180.1 -0.0 -0.1 44 653 16 09 30 16 15 50 --- 09 58 13 75.8-175.4 0.1 3.4 380 702 16 09 31 16 16 40 J0941+4336 09 59 03 75.7-168.0 0.3 8.9 44 702 16 16 40 16 18 40 --- 10 01 03 75.7-166.5 0.3 9.9 120 718 16 16 41 16 19 50 J0950+4329S 10 02 13 75.7-172.5 0.2 5.5 64 718 16 19 50 16 26 10 --- 10 08 34 75.6-167.9 0.3 8.9 380 766 16 19 51 16 27 20 J0941+4336 10 09 45 75.3-160.4 0.4 14.4 64 766 16 27 20 16 29 20 --- 10 11 45 75.2-159.0 0.5 15.4 120 782 16 27 21 16 30 30 J0950+4329S 10 12 55 75.4-164.7 0.3 11.2 64 782 16 30 30 16 36 50 --- 10 19 16 75.2-160.3 0.5 14.4 380 831 16 30 31 16 38 00 J0941+4336 10 20 26 74.8-153.2 0.6 19.5 64 831 16 38 00 16 40 00 --- 10 22 27 74.6-151.9 0.7 20.4 120 846 16 38 01 16 41 10 J0950+4329S 10 23 37 75.0-157.3 0.5 16.5 64 846 16 41 10 16 47 30 --- 10 29 58 74.6-153.2 0.6 19.5 380 895 16 41 11 16 48 40 J0941+4336 10 31 08 74.0-146.5 0.8 24.1 64 895 16 48 40 16 50 40 --- 10 33 08 73.9-145.3 0.8 24.9 120 911 16 48 41 16 51 50 J0950+4329S 10 34 19 74.4-150.4 0.7 21.4 64 911 16 51 50 16 58 10 --- 10 40 40 73.9-146.5 0.8 24.0 380 960 16 51 51 Schedule for IRBENE (Code Ir ) Page 4 Varstrometry selected dual-Quasar candidates 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 25 May 2024 Day 146 --- 16 59 20 J0941+4336 10 41 50 73.2-140.3 1.0 28.2 64 960 16 59 20 17 01 20 --- 10 43 50 73.0-139.2 1.0 28.9 120 975 16 59 21 17 02 30 J0950+4329S 10 45 00 73.6-143.9 0.9 25.8 64 975 17 02 30 17 08 50 --- 10 51 21 73.0-140.4 1.0 28.1 380 1024 17 02 31 17 10 00 J0941+4336 10 52 32 72.2-134.7 1.2 31.7 64 1024 17 10 00 17 12 00 --- 10 54 32 72.0-133.7 1.2 32.4 120 1040 17 10 01 17 13 10 J0950+4329S 10 55 42 72.7-138.0 1.1 29.6 65 1040 17 13 10 17 19 30 --- 11 02 03 72.1-134.7 1.2 31.6 380 1089 17 13 11 17 20 40 J0941+4336 11 03 13 71.2-129.5 1.3 34.8 65 1089 17 20 40 17 22 40 --- 11 05 14 70.9-128.6 1.4 35.3 120 1104 17 20 41 17 23 50 J0950+4329S 11 06 24 71.7-132.6 1.2 32.9 65 1104 17 23 50 17 30 10 --- 11 12 45 71.0-129.6 1.3 34.7 380 1153 17 23 51 17 31 20 J0941+4336 11 13 55 70.0-124.8 1.5 37.4 65 1153 17 31 20 17 33 20 --- 11 15 55 69.8-123.9 1.6 37.9 120 1168 17 31 21 17 34 30 J0950+4329S 11 17 06 70.6-127.6 1.4 35.8 65 1168 17 34 30 17 40 50 --- 11 23 27 69.9-124.9 1.5 37.3 380 1217 17 34 31 17 42 00 J0941+4336 11 24 37 68.8-120.5 1.7 39.6 65 1217 17 42 00 17 44 00 --- 11 26 37 68.6-119.7 1.7 40.0 120 1233 17 42 01 17 44 55 J0950+4329S 11 27 32 69.4-123.2 1.6 38.1 50 1233 17 44 55 17 51 05 --- 11 33 43 68.7-120.7 1.7 39.4 370 1280 17 44 56 17 52 00 J0941+4336 11 34 38 67.6-116.7 1.9 41.3 50 1280 17 52 00 17 54 00 --- 11 36 39 67.4-116.0 1.9 41.7 120 1296 17 52 01 17 54 55 J0950+4329S 11 37 34 68.3-119.3 1.8 40.1 50 1296 17 54 55 18 01 05 --- 11 43 45 67.5-117.0 1.9 41.1 370 1344 17 54 56 18 02 00 J0941+4336 11 44 40 66.4-113.3 2.0 42.8 50 1344 18 02 00 18 04 00 --- 11 46 40 66.2-112.6 2.1 43.1 120 1359 18 02 01 18 04 55 J0950+4329S 11 47 36 67.1-115.7 1.9 41.7 50 1359 18 04 55 18 11 05 --- 11 53 47 66.3-113.5 2.0 42.6 370 1407 18 04 56 18 12 00 J0941+4336 11 54 42 65.2-110.1 2.2 44.0 50 1407 18 12 00 18 14 00 --- 11 56 42 64.9-109.4 2.2 44.2 120 1422 18 12 01 Schedule for IRBENE (Code Ir ) Page 5 Varstrometry selected dual-Quasar candidates 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 25 May 2024 Day 146 --- 18 14 55 J0950+4329S 11 57 37 65.8-112.3 2.1 43.1 50 1422 18 14 55 18 21 05 --- 12 03 48 65.1-110.3 2.2 43.8 370 1470 18 14 56 18 22 00 J0941+4336 12 04 43 63.9-107.0 2.4 45.0 50 1470 18 22 00 18 24 00 --- 12 06 44 63.6-106.5 2.4 45.2 120 1485 18 22 01 18 24 45 J0950+4329S 12 07 29 64.6-109.2 2.3 44.2 41 1485 18 24 45 18 31 15 --- 12 14 00 63.8-107.2 2.4 44.8 390 1536 18 24 46 18 32 00 J0941+4336 12 14 45 62.6-104.2 2.5 45.8 41 1536 18 32 00 18 34 00 --- 12 16 45 62.3-103.7 2.6 46.0 120 1551 18 32 01 18 34 45 J0950+4329S 12 17 30 63.3-106.2 2.4 45.1 41 1551 18 34 45 18 41 15 --- 12 24 02 62.5-104.4 2.5 45.6 390 1601 18 34 46 18 42 00 J0941+4336 12 24 47 61.3-101.5 2.7 46.4 41 1601 18 42 00 18 44 00 --- 12 26 47 61.0-101.0 2.7 46.6 120 1617 18 42 01 18 44 45 J0950+4329S 12 27 32 62.0-103.5 2.6 45.9 41 1617 18 44 45 18 51 15 --- 12 34 03 61.2-101.7 2.7 46.3 390 1667 18 44 46 18 52 00 J0941+4336 12 34 48 59.9 -99.0 2.9 46.9 41 1667 18 52 00 18 54 00 --- 12 36 49 59.7 -98.5 2.9 47.0 120 1682 18 52 01 18 54 45 J0950+4329S 12 37 34 60.7-100.8 2.8 46.5 41 1682 18 54 45 19 01 15 --- 12 44 05 59.9 -99.2 2.9 46.8 390 1733 18 54 46 19 02 00 J0941+4336 12 44 50 58.6 -96.6 3.0 47.3 41 1733 19 02 00 19 04 00 --- 12 46 50 58.3 -96.1 3.1 47.4 120 1748 19 02 01 19 04 45 J0950+4329S 12 47 35 59.4 -98.3 2.9 46.9 41 1748 19 04 45 19 11 15 --- 12 54 06 58.5 -96.7 3.0 47.1 390 1798 19 04 46 19 12 00 J0941+4336 12 54 52 57.3 -94.3 3.2 47.5 41 1798 19 12 00 19 14 00 --- 12 56 52 57.0 -93.8 3.2 47.6 120 1814 19 12 01 19 14 45 J0950+4329S 12 57 37 58.1 -95.9 3.1 47.2 41 1814 19 14 45 19 21 15 --- 13 04 08 57.2 -94.4 3.2 47.4 390 1864 19 14 46 19 22 00 J0941+4336 13 04 53 55.9 -92.0 3.4 47.7 41 1864 19 22 00 19 24 00 --- 13 06 54 55.7 -91.6 3.4 47.7 120 1879 19 22 01 19 25 00 J0956+2515 13 07 54 43.4-113.4 3.2 32.9 46 1879 19 25 00 19 30 00 =OK290 13 12 55 42.8-112.1 3.2 33.3 300 1918 19 25 01 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: sess224.L1024 --- WARNING --- This group does not match an entry in the frequency catalog. This might be ok because the catalog is not complete. But be very careful to be sure that the setup is correct. Setup group: 9 Station: IRBENE Total bit rate: 1024 Format: VDIF Bits per sample: 2 Sample rate: 64.000 Number of channels: 8 DBE type: DBBC_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 1350.00 1350.00 1350.00 1350.00 1350.00 1350.00 1350.00 1350.00 Net SB= L L U U L L U U IF SB = U U U U U U U U Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 9 1 9 2 10 2 10 BBC SB= L L U U L L U U IF = A2 C2 A2 C2 A2 C2 A2 C2 The following frequency sets based on these setups were used. Frequency Set: 9 Setup file default. Used with PCAL = off LO sum= 1626.49 1626.49 1626.49 1626.49 1690.49 1690.49 1690.49 1690.49 BBC fr= 276.49 276.49 276.49 276.49 340.49 340.49 340.49 340.49 Bandwd= 32.00 32.00 32.00 32.00 32.00 32.00 32.00 32.00 Matching frequency sets: 9 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) * J0950+4329S 09 47 23.456394 * 09 50 31.630000 09 52 02.913973 0.00 43 43 10.80497 * 43 29 08.26000 43 22 31.49947 0.00 From catalog imbedded in main SCHED input file. * J0927+3902 09 23 55.319223 * 09 27 03.013944 09 28 33.880359 0.00 39 15 23.56637 * 39 02 20.85177 38 56 11.90638 0.00 From catalog imbedded in main SCHED input file. * J0941+4336 09 38 06.240392 * 09 41 16.707942 09 42 49.023018 0.00 43 50 29.00062 * 43 36 49.06097 43 30 23.32098 0.00 From catalog imbedded in main SCHED input file. OK290 09 53 59.738482 * 09 56 49.875376 09 58 12.440319 0.41 * J0956+2515 25 29 33.58581 * 25 15 16.04991 25 08 26.43478 0.37 0953+254 /home/guest/rmc/SCHED/sched11.6/catalogs/sources.gsfc J0956+25 GSFC 2016a X/S astro solution, 26975 observations. 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 J0950+4329Ssess224.L1024 1 2 3 4 5 6 7 8 9 10 2.994 264.109 J0927+3902 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.083 7.583 J0941+4336 sess224.L1024 1 2 3 4 5 6 7 8 9 10 0.975 86.032 J0956+2515 sess224.L1024 1 2 3 4 6 7 8 9 10 0.083 5.447 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) J0950+4329S 72.1 J0927+3902 68.7 J0941+4336 70.5 J0956+2515 78.2 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