COVER INFORMATION Station: GBT_VLBA (Code Gb ) Experiment: GL026B VLBA format, 18 cm, Arp 220, Colin Lonsdale, November 2002 Exp. Code: GL026B Schedule Version: 1.00 Processed by SCHED version: Release of 02 July 2002 PI: Colin Lonsdale Address: MIT Haystack Observatory Off Route 40 Westford, MA 01886 Phone: 508-692-4764 (work) or 603-672-1268 (home) EMAIL: cjl@dopey.haystack.edu Fax: 617-981-0590 Phone during observation: 508-692-4764 (work) or 603-672-1268 (home) Observing mode: 256-8-2 Notes: Primary fringe finder 1613+341 Schedule for GBT_VLBA (Code Gb ) Page 2 GL026B VLBA format, 18 cm, Arp 220, Colin Lonsdale, November 2002 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Sat 16 Nov 2002 Day 320 --- Next scan frequencies: 1632.99 1632.99 1640.99 1640.99 1648.99 1648.99 1656.99 1656.99 Next BBC frequencies: 667.01 667.01 659.01 659.01 651.01 651.01 643.01 643.01 Next scan bandwidths: 8.00 8.00 8.00 8.00 8.00 8.00 8.00 8.00 12 30 00 1613+341 10 52 17 27.2 66.5 -5.4 -60.3 0 1 1 0 12 30 00 12 36 00 --- 10 58 18 28.3 67.2 -5.3 -60.8 360 F 1 4800 12 36 00 ARP220 10 58 18 30.2 82.7 -4.6 -57.9 -43 1 1 4800 12 36 00 12 52 00 --- 11 14 21 33.3 85.0 -4.3 -58.3 917 F 1 17600 13 00 00 1613+341 11 22 22 32.7 69.9 -4.9 -62.8 438 1 2 17600 13 00 00 13 03 00 --- 11 25 22 33.3 70.3 -4.8 -63.1 180 R 1 15200 13 03 00 ARP220 11 25 22 35.5 86.6 -4.2 -58.5 -44 1 2 15200 13 03 00 13 22 00 --- 11 44 26 39.2 89.5 -3.8 -58.7 1096 R 1 0 13 23 00 ARP220 11 45 26 39.4 89.6 -3.8 -58.7 42 1 3 0 13 23 00 13 45 00 --- 12 07 29 43.7 93.1 -3.5 -58.5 1320 F 1 17600 13 47 00 ARP220 12 09 30 44.1 93.5 -3.4 -58.5 102 1 4 17600 13 47 00 14 09 00 --- 12 31 33 48.4 97.3 -3.1 -57.9 1320 R 1 0 14 11 00 ARP220 12 33 34 48.8 97.7 -3.0 -57.8 102 1 5 0 14 11 00 14 33 00 --- 12 55 37 53.1 102.0 -2.7 -56.7 1320 F 1 17600 14 40 00 1516+193 13 02 38 55.4 113.4 -2.2 -49.7 384 1 6 17600 14 40 00 14 43 00 --- 13 05 39 55.9 114.3 -2.2 -49.3 180 R 1 15200 14 43 00 ARP220 13 05 39 55.0 104.2 -2.5 -55.9 -34 1 6 15200 14 43 00 15 02 00 --- 13 24 42 58.6 108.8 -2.2 -54.0 1106 R 1 0 15 05 00 ARP220 13 27 43 59.1 109.6 -2.1 -53.6 161 1 7 0 15 05 00 15 27 00 --- 13 49 46 63.1 116.0 -1.8 -50.1 1320 F 1 17600 15 30 00 ARP220 13 52 47 63.6 117.0 -1.7 -49.5 161 1 8 17600 15 30 00 15 52 00 --- 14 14 50 67.3 125.4 -1.3 -44.1 1320 R 1 0 15 55 00 ARP220 14 17 51 67.8 126.7 -1.3 -43.2 161 1 9 0 15 55 00 16 17 00 --- 14 39 54 71.0 137.8 -0.9 -35.0 1320 F 1 17600 Schedule for GBT_VLBA (Code Gb ) Page 3 GL026B VLBA format, 18 cm, Arp 220, Colin Lonsdale, November 2002 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Sat 16 Nov 2002 Day 320 --- 16 20 00 1516+193 14 42 55 69.7 156.2 -0.6 -19.6 132 1 10 17600 16 20 00 16 26 00 --- 14 48 56 70.1 160.2 -0.5 -16.4 360 R 1 12800 16 26 00 ARP220 14 48 56 72.1 143.3 -0.8 -30.7 -45 1 10 12800 16 26 00 16 42 00 --- 15 04 58 73.7 154.6 -0.5 -21.5 915 R 1 0 16 45 00 ARP220 15 07 59 74.0 156.9 -0.5 -19.5 159 1 11 0 16 45 00 17 07 00 --- 15 30 03 75.0 175.6 -0.1 -3.8 1320 F 1 17600 17 10 00 ARP220 15 33 03 75.1 178.2 0.0 -1.5 159 1 12 17600 17 10 00 17 32 00 --- 15 55 07 74.5 197.4 0.3 14.8 1320 R 1 0 17 35 00 1613+341 15 58 07 84.7 142.1 -0.3 -35.6 71 1 13 0 17 35 00 17 38 00 --- 16 01 08 85.1 148.0 -0.2 -30.1 180 F 1 2400 17 38 00 ARP220 16 01 08 74.1 202.3 0.4 18.9 -107 1 13 2400 17 38 00 17 57 00 --- 16 20 11 72.2 216.0 0.8 30.2 1033 F 1 17600 18 00 00 ARP220 16 23 11 71.9 217.9 0.8 31.7 160 1 14 17600 18 00 00 18 22 00 --- 16 45 15 68.9 230.1 1.2 40.9 1320 R 1 0 ----------- Tape Change ------------ 18 40 00 1613+341 17 03 18 79.2 250.8 0.8 63.5 1028 2 1 0 18 40 00 18 43 00 --- 17 06 18 78.6 252.2 0.9 64.4 180 F 1 2400 18 43 00 ARP220 17 06 18 65.5 239.1 1.5 47.1 -61 2 1 2400 18 43 00 19 02 00 --- 17 25 21 62.2 245.6 1.8 51.0 1079 F 1 17600 19 05 00 ARP220 17 28 22 61.7 246.5 1.9 51.5 161 2 2 17600 19 05 00 19 27 00 --- 17 50 26 57.6 252.5 2.3 54.5 1320 R 1 0 19 30 00 ARP220 17 53 26 57.1 253.2 2.3 54.9 161 2 3 0 19 30 00 19 52 00 --- 18 15 30 52.9 258.2 2.7 56.7 1320 F 1 17600 19 55 00 ARP220 18 18 30 52.3 258.8 2.7 56.9 161 2 4 17600 19 55 00 20 17 00 --- 18 40 34 48.0 263.0 3.1 58.0 1320 R 1 0 20 20 00 1613+341 18 43 34 59.7 273.7 2.5 71.0 124 2 5 0 20 20 00 20 23 00 --- 18 46 35 59.1 274.1 2.5 70.9 180 F 1 2400 20 23 00 ARP220 18 46 35 46.9 264.1 3.2 58.2 -58 2 5 2400 20 23 00 20 42 00 --- 19 05 38 43.1 267.4 3.5 58.6 1082 F 1 17600 Schedule for GBT_VLBA (Code Gb ) Page 4 GL026B VLBA format, 18 cm, Arp 220, Colin Lonsdale, November 2002 UP: D => Below limits; H => Below horizon mask. blank => Up. Early: Seconds between end of slew and start. Dwell: On source seconds. Tapes: Drive, Index, Start footage / Direction, Head Group, End footage. TPStart: Tape motion start time. Frequencies are LO sum (band edge). Automatic tape allocation specified. Tape positions are just estimates. ---------------------------------------------------------------------------------------- Start UT Source Start / Stop Early Tapes TPStart Stop UT LST EL AZ HA UP ParA Dwell (see above) ---------------------------------------------------------------------------------------- --- Sat 16 Nov 2002 Day 320 --- 20 45 00 ARP220 19 08 38 42.5 267.9 3.6 58.6 161 2 6 17600 20 45 00 21 07 00 --- 19 30 42 38.2 271.3 3.9 58.6 1320 R 1 0 21 10 00 ARP220 19 33 42 37.6 271.8 4.0 58.6 161 2 7 0 21 10 00 21 32 00 --- 19 55 46 33.3 275.0 4.3 58.3 1320 F 1 17600 21 35 00 ARP220 19 58 47 32.7 275.4 4.4 58.2 161 2 8 17600 21 35 00 21 57 00 --- 20 20 50 28.4 278.6 4.8 57.6 1320 R 1 0 22 00 00 1613+341 20 23 51 40.4 285.5 4.2 65.9 123 2 9 0 22 00 00 22 06 00 --- 20 29 52 39.3 286.1 4.3 65.5 360 F 1 4800 22 06 00 ARP220 20 29 52 26.7 279.8 4.9 57.3 -59 2 9 4800 22 06 00 22 22 00 --- 20 45 54 23.6 282.0 5.2 56.7 901 F 1 17600 22 25 00 ARP220 20 48 55 23.0 282.4 5.2 56.5 161 2 10 17600 22 25 00 22 47 00 --- 21 10 58 18.9 285.5 5.6 55.4 1320 R 1 0 22 50 00 ARP220 21 13 59 18.3 285.9 5.6 55.2 161 2 11 0 22 50 00 23 12 00 --- 21 36 03 14.2 288.9 6.0 53.9 1320 F 1 17600 23 15 00 ARP220 21 39 03 13.6 289.4 6.1 53.7 161 2 12 17600 23 15 00 23 37 00 --- 22 01 07 9.6 292.5 6.4 52.1 1320 R 1 0 23 40 00 1613+341 22 04 07 22.1 296.9 5.8 57.7 121 2 13 0 23 40 00 23 43 00 --- 22 07 08 21.6 297.2 5.9 57.4 180 F 1 2400 23 43 00 ARP220 22 07 08 8.5 293.3 6.5 51.7 -61 2 13 2400 23 43 00 23 58 00 --- 22 22 10 5.8 295.5 6.8 50.4 839 F 1 14400 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: arp220.set Matches group gbt18cm in /usr/local/vlbi_sched/catalogs/freq.dat LO1=4.550, LO2=12.75, LO3=10.5 Setup group: 8 Station: GBT_VLBA Total bit rate: 256 Format: VLBA1:2 Bits per sample: 2 Sample rate: 16.000 Number of channels: 8 Passes/head pos: 1 Speedup factor: 1.00 Tape speeds: Low density - 266.660 ips, High density - 160.00 ips Time per pass for 17600 ft, High density tapes is: 00:22:00 1st LO= 2300.00 2300.00 2300.00 2300.00 2300.00 2300.00 2300.00 2300.00 Net 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= L L L L L L L L IF = A C A C A C A C The following frequency sets based on this setup were used. Frequency Set: 8 Setup file default. Used pcal sets: 1 LO sum= 1632.99 1632.99 1640.99 1640.99 1648.99 1648.99 1656.99 1656.99 BBC fr= 667.01 667.01 659.01 659.01 651.01 651.01 643.01 643.01 Bandwd= 8.000 8.000 8.000 8.000 8.000 8.000 8.000 8.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = 1MHZ PCALXB1= S1 S3 S5 S7 S1 S3 S5 S7 PCALXB2= S2 S4 S6 S8 S2 S4 S6 S8 PCALFR1= 10 10 10 10 6010 6010 6010 6010 PCALFR2= 10 10 10 10 6010 6010 6010 6010 Track assignments are: track1= 2, 10, 18, 26, 3, 11, 19, 27 barrel=roll_auto SOURCE LIST -- GL026B VLBA format, 18 cm, Arp 220, Colin Lonsdale, November 2002 Catalog positions marked with *. Precession of date coordinates is based on stop time of first scan. Names used in schedule marked with *. Short names used in VLA and SNAP files marked with +. Observation date used in B1950/J2000 coordinate conversion (PRECDATE): 1979.900 No adjustments are made for rates (DRA, DDEC). Source Source position (RA/Dec) (B1950) (J2000) (Date) * ARP220 15 32 46.880196 * 15 34 57.224670 15 35 02.406600 23 40 07.99276 * 23 30 11.56400 23 29 43.00602 From catalog imbedded in main SCHED input file. * 1516+193 15 14 40.987286 * 15 16 56.797600 15 17 02.300133 19 43 10.96935 * 19 32 13.01900 19 31 41.16431 From catalog imbedded in main SCHED input file. * 1613+341 16 11 47.914510 * 16 13 41.064500 16 13 45.236673 34 20 19.83496 * 34 12 47.91000 34 12 27.67864 From catalog imbedded in main SCHED input file. * 3C286 13 28 49.657708 * 13 31 08.288000 13 31 14.112421 30 45 58.64136 * 30 30 32.96000 30 29 43.43295 From catalog imbedded in main SCHED input file. 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) ARP220 42.3 1516+193 38.4 1613+341 54.2 3C286 56.6 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