COVER INFORMATION Station: VLBA_NL (Code Nl ) Experiment: Parsec scale structure in ISM and the nature of 21-cm absorbers Exp. Code: GG074 Schedule Version: 1.00 Processed by SCHED version: 9.40 Release Jan. 13, 2011. PI: Neeraj Gupta Address: ASTRON Postbus 2 7990 AA Dwingeloo The Netherlands Phone: +31-521-595782 EMAIL: gupta@astron.nl Fax: Phone during observation: +31-521-595782 Observing mode: Notes: Concerning this schedule you can also contact Yurii Pidopryhora, pidopryhora@jive.nl, +31-521-596548 COVER LETTER: Block schedule quote: GG074 Eb Wb Jb1 On25 Mc Tr -- EVN Eu 159 1700(08/06)-0300(09/06) 21cm (1396.5 MHz) US 159 1700(08/06)-0500(09/06) VLBA Target: J1243+4043 Delay calibrator: J1242+3751 Bandpass claibrators/fringe-finders: 4C39.25, 3C345 WSRT calibrator: 3C286 In this experiment we observe an HI absorber (with z~0.0169) in front of a ~196 mJy quasar. The peak absorption is at ~1396.47 MHz, which is centered at one of the observation subbands (with 0 frequency offset). !!! PCAL is OFF for this experiment !!! Schedule for VLBA_NL (Code Nl ) Page 2 Parsec scale structure in ISM and the nature of 21-cm absorbers 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 ---------------------------------------------------------------------------------------- --- Wed 8 Jun 2011 Day 159 --- Next scan frequencies: 1390.83 1390.83 1394.77 1394.77 1398.70 1398.70 1402.63 1402.63 Next BBC frequencies: 709.17 709.17 705.23 705.23 701.30 701.30 697.37 697.37 Next scan bandwidths: 4.00 4.00 4.00 4.00 4.00 4.00 4.00 4.00 18 02 40 J1243+4043 05 03 28 11.1 44.4 -7.7 -43.4 0 0 18 02 35 18 14 10 --- 05 14 59 12.6 46.0 -7.5 -45.0 690 11 18 02 36 18 14 40 J1243+4043 05 15 30 12.7 46.0 -7.5 -45.0 24 11 18 14 35 18 26 10 --- 05 27 01 14.3 47.6 -7.3 -46.6 690 22 18 14 36 18 27 10 J1242+3751 05 28 02 12.6 50.0 -7.3 -46.3 48 22 18 27 05 18 29 10 =1240+381 05 30 02 12.9 50.3 -7.2 -46.6 120 24 18 27 06 18 30 10 J1243+4043 05 31 02 14.8 48.1 -7.2 -47.1 48 24 18 30 05 18 41 40 --- 05 42 34 16.4 49.7 -7.0 -48.5 690 36 18 30 06 18 42 10 J1243+4043 05 43 04 16.5 49.7 -7.0 -48.6 24 36 18 42 05 18 53 40 --- 05 54 36 18.2 51.2 -6.8 -50.0 690 47 18 42 06 18 54 40 J1242+3751 05 55 36 16.6 53.8 -6.8 -49.6 49 47 18 54 35 18 56 40 =1240+381 05 57 36 16.9 54.1 -6.8 -49.8 120 49 18 54 36 19 04 50 4C39.25 06 05 48 52.0 76.9 -3.4 -69.1 411 49 19 04 45 19 09 50 --- 06 10 49 52.9 77.4 -3.3 -69.5 300 54 19 04 46 19 17 20 J1243+4043 06 18 20 21.7 54.2 -6.4 -52.9 375 54 19 17 15 19 28 50 --- 06 29 52 23.5 55.6 -6.2 -54.2 690 65 19 17 16 19 29 20 J1243+4043 06 30 22 23.5 55.7 -6.2 -54.3 24 65 19 29 15 19 40 50 --- 06 41 54 25.3 57.0 -6.0 -55.6 690 76 19 29 16 19 41 50 J1242+3751 06 42 54 24.0 59.9 -6.0 -54.7 49 76 19 41 45 19 43 50 =1240+381 06 44 54 24.3 60.1 -6.0 -54.9 120 78 19 41 46 19 44 50 J1243+4043 06 45 54 26.0 57.5 -6.0 -56.0 49 78 19 44 45 19 56 20 --- 06 57 26 27.8 58.9 -5.8 -57.3 690 89 19 44 46 19 56 50 J1243+4043 06 57 56 27.9 58.9 -5.8 -57.4 24 89 19 56 45 20 08 20 --- 07 09 28 29.7 60.2 -5.6 -58.6 690 101 19 56 46 Schedule for VLBA_NL (Code Nl ) Page 3 Parsec scale structure in ISM and the nature of 21-cm absorbers 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 ---------------------------------------------------------------------------------------- --- Wed 8 Jun 2011 Day 159 --- 20 09 20 J1242+3751 07 10 28 28.5 63.3 -5.5 -57.5 49 101 20 09 15 20 11 20 =1240+381 07 12 29 28.9 63.5 -5.5 -57.6 120 103 20 09 16 20 12 20 J1243+4043 07 13 29 30.4 60.7 -5.5 -59.0 49 103 20 12 15 20 23 50 --- 07 25 01 32.3 62.0 -5.3 -60.2 690 114 20 12 16 20 24 20 J1243+4043 07 25 31 32.3 62.0 -5.3 -60.3 24 114 20 24 15 20 35 50 --- 07 37 03 34.2 63.3 -5.1 -61.5 690 125 20 24 16 20 36 50 J1242+3751 07 38 03 33.2 66.6 -5.1 -60.0 50 125 20 36 45 20 38 50 =1240+381 07 40 03 33.5 66.8 -5.1 -60.2 120 127 20 36 46 20 39 50 J1243+4043 07 41 03 34.9 63.8 -5.1 -61.9 50 127 20 39 45 20 51 20 --- 07 52 35 36.9 65.0 -4.9 -63.0 690 138 20 39 46 20 51 50 J1243+4043 07 53 05 36.9 65.1 -4.9 -63.1 24 138 20 51 45 21 03 20 --- 08 04 37 38.9 66.3 -4.7 -64.2 690 150 20 51 46 21 04 20 J1242+3751 08 05 37 38.0 69.8 -4.6 -62.3 50 150 21 04 15 21 06 20 =1240+381 08 07 38 38.3 70.0 -4.6 -62.5 120 152 21 04 16 21 07 20 J1243+4043 08 08 38 39.6 66.7 -4.6 -64.6 50 152 21 07 15 21 18 50 --- 08 20 10 41.6 67.9 -4.4 -65.7 690 163 21 07 16 21 19 20 J1243+4043 08 20 40 41.7 68.0 -4.4 -65.7 24 163 21 19 15 21 30 50 --- 08 32 12 43.7 69.2 -4.2 -66.8 690 174 21 19 16 21 31 50 J1242+3751 08 33 12 42.8 73.0 -4.2 -64.5 49 174 21 31 45 21 33 50 =1240+381 08 35 12 43.2 73.2 -4.1 -64.6 120 176 21 31 46 21 38 00 4C39.25 08 39 23 80.4 102.8 -0.8 -69.3 165 176 21 37 55 21 43 00 --- 08 44 24 81.3 105.0 -0.7 -67.9 300 181 21 37 56 21 47 10 J1243+4043 08 48 34 46.5 70.9 -3.9 -68.3 168 181 21 47 05 21 58 40 --- 09 00 06 48.6 72.0 -3.7 -69.3 690 192 21 47 06 21 59 10 J1243+4043 09 00 36 48.6 72.1 -3.7 -69.3 24 192 21 59 05 22 10 40 --- 09 12 08 50.7 73.2 -3.5 -70.3 690 203 21 59 06 22 11 40 J1242+3751 09 13 08 50.0 77.7 -3.5 -67.2 49 203 22 11 35 22 13 40 =1240+381 09 15 09 50.4 77.9 -3.5 -67.3 120 205 22 11 36 22 14 40 J1243+4043 09 16 09 51.4 73.6 -3.5 -70.7 49 205 22 14 35 22 26 10 --- 09 27 41 53.5 74.8 -3.3 -71.6 690 217 22 14 36 Schedule for VLBA_NL (Code Nl ) Page 4 Parsec scale structure in ISM and the nature of 21-cm absorbers 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 ---------------------------------------------------------------------------------------- --- Wed 8 Jun 2011 Day 159 --- 22 26 40 J1243+4043 09 28 11 53.6 74.9 -3.3 -71.7 24 217 22 26 35 22 38 10 --- 09 39 43 55.7 76.0 -3.1 -72.6 690 228 22 26 36 22 39 10 J1242+3751 09 40 43 55.1 81.0 -3.0 -68.8 49 228 22 39 05 22 41 10 =1240+381 09 42 43 55.5 81.3 -3.0 -68.9 120 230 22 39 06 22 42 10 J1243+4043 09 43 43 56.4 76.4 -3.0 -72.9 49 230 22 42 05 22 53 40 --- 09 55 15 58.5 77.6 -2.8 -73.8 690 241 22 42 06 22 54 10 J1243+4043 09 55 45 58.6 77.6 -2.8 -73.8 24 241 22 54 05 23 05 40 --- 10 07 17 60.7 78.8 -2.6 -74.7 690 252 22 54 06 23 06 40 J1242+3751 10 08 17 60.2 84.6 -2.6 -70.0 48 252 23 06 35 23 08 40 =1240+381 10 10 18 60.6 84.9 -2.6 -70.0 120 254 23 06 36 23 09 40 J1243+4043 10 11 18 61.4 79.2 -2.6 -75.0 48 254 23 09 35 23 21 10 --- 10 22 50 63.5 80.4 -2.4 -75.8 690 265 23 09 36 23 21 40 J1243+4043 10 23 20 63.6 80.5 -2.4 -75.9 24 265 23 21 35 23 33 10 --- 10 34 52 65.7 81.7 -2.2 -76.6 690 277 23 21 36 23 34 10 J1242+3751 10 35 52 65.3 88.6 -2.1 -70.6 47 277 23 34 05 23 36 10 =1240+381 10 37 52 65.7 88.9 -2.1 -70.7 120 279 23 34 06 23 37 10 J1243+4043 10 38 52 66.5 82.1 -2.1 -76.9 47 279 23 37 05 23 48 40 --- 10 50 24 68.6 83.4 -1.9 -77.6 690 290 23 37 06 --- Start: Wed 8 Jun 2011 Day 159 -- Stop: Thu 9 Jun 2011 Day 160 --- 23 49 10 J1243+4043 10 50 54 68.7 83.4 -1.9 -77.6 24 290 23 49 05 00 00 40 --- 11 02 26 70.8 84.7 -1.7 -78.3 690 301 23 49 06 00 01 40 J1242+3751 11 03 27 70.5 93.5 -1.7 -70.4 46 301 00 01 35 00 03 40 =1240+381 11 05 27 70.8 93.9 -1.6 -70.3 120 303 00 01 36 00 04 40 J1243+4043 11 06 27 71.6 85.2 -1.6 -78.5 46 303 00 04 35 00 16 10 --- 11 17 59 73.7 86.6 -1.4 -79.0 690 314 00 04 36 00 16 40 J1243+4043 11 18 29 73.8 86.7 -1.4 -79.0 24 314 00 16 35 00 28 10 --- 11 30 01 76.0 88.3 -1.2 -79.4 690 325 00 16 36 00 29 10 J1242+3751 11 31 01 75.6 100.0 -1.2 -68.3 44 325 00 29 05 00 31 10 =1240+381 11 33 01 75.9 100.6 -1.2 -68.1 120 327 00 29 06 Schedule for VLBA_NL (Code Nl ) Page 5 Parsec scale structure in ISM and the nature of 21-cm absorbers 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 ---------------------------------------------------------------------------------------- --- Thu 9 Jun 2011 Day 160 --- 00 36 10 3C345 11 38 02 34.2 64.5 -5.1 -61.2 204 327 00 36 05 00 41 10 --- 11 43 03 35.0 65.0 -5.0 -61.6 300 332 00 36 06 00 46 10 J1243+4043 11 48 04 79.3 91.2 -0.9 -79.5 201 332 00 46 05 00 57 40 --- 11 59 36 81.5 93.7 -0.7 -78.9 690 344 00 46 06 00 58 10 J1243+4043 12 00 06 81.6 93.8 -0.7 -78.9 24 344 00 58 05 01 09 40 --- 12 11 38 83.7 97.4 -0.5 -77.2 690 355 00 58 06 01 10 40 J1242+3751 12 12 38 82.9 121.4 -0.5 -53.6 35 355 01 10 35 01 12 40 =1240+381 12 14 38 83.2 123.4 -0.5 -52.0 120 357 01 10 36 01 13 40 J1243+4043 12 15 38 84.5 99.1 -0.5 -76.2 34 357 01 13 35 01 25 10 --- 12 27 10 86.6 107.2 -0.3 -69.9 690 368 01 13 36 01 25 40 J1243+4043 12 27 40 86.7 107.8 -0.3 -69.5 24 368 01 25 35 01 37 10 --- 12 39 12 88.5 137.4 -0.1 -41.7 690 379 01 25 36 01 38 10 J1242+3751 12 40 12 86.0 170.9 -0.1 -8.6 29 379 01 38 05 01 40 10 =1240+381 12 42 13 86.0 176.5 0.0 -3.3 120 381 01 38 06 01 46 10 J1243+4043 12 48 14 88.7 212.8 0.1 32.2 342 381 01 46 05 01 55 10 --- 12 57 15 87.4 246.4 0.2 64.3 540 390 01 46 06 01 55 40 J1243+4043 12 57 45 87.3 247.3 0.2 65.1 23 390 01 55 35 02 04 50 --- 13 06 57 85.6 257.3 0.4 73.6 550 399 01 55 36 02 05 50 J1242+3751 13 07 57 83.8 231.8 0.4 47.9 33 399 02 05 45 02 07 50 =1240+381 13 09 57 83.5 234.1 0.4 49.9 120 401 02 05 46 02 08 50 J1243+4043 13 10 57 84.9 259.7 0.4 75.4 34 401 02 08 45 02 17 20 --- 13 19 29 83.3 263.4 0.6 77.6 510 409 02 08 46 02 17 50 J1243+4043 13 19 59 83.2 263.6 0.6 77.7 24 409 02 17 45 02 26 20 --- 13 28 30 81.7 266.1 0.7 78.8 510 418 02 17 46 02 27 20 J1242+3751 13 29 30 80.3 249.5 0.8 62.2 40 418 02 27 15 02 29 20 =1240+381 13 31 31 80.0 250.6 0.8 62.9 120 420 02 27 16 02 30 20 J1243+4043 13 32 31 80.9 267.0 0.8 79.1 40 420 02 30 15 02 38 50 --- 13 41 02 79.3 268.8 0.9 79.5 510 428 02 30 16 02 39 20 J1243+4043 13 41 32 79.2 268.9 1.0 79.5 24 428 02 39 15 02 47 50 --- 13 50 04 77.6 270.4 1.1 79.5 510 436 02 39 16 Schedule for VLBA_NL (Code Nl ) Page 6 Parsec scale structure in ISM and the nature of 21-cm absorbers 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 ---------------------------------------------------------------------------------------- --- Thu 9 Jun 2011 Day 160 --- 02 48 50 J1242+3751 13 51 04 76.4 258.5 1.1 67.6 43 436 02 48 45 02 50 50 =1240+381 13 53 04 76.1 259.1 1.2 67.9 120 438 02 48 46 02 55 40 3C345 13 57 55 58.9 439.6 -2.8 -72.7 151 438 02 55 35 03 00 00 --- 14 02 16 59.7 440.1 -2.7 -73.0 260 443 02 55 36 03 02 30 J1243+4043 14 04 46 74.9 272.5 1.3 79.2 20 443 03 02 25 03 14 00 --- 14 16 18 72.8 274.0 1.5 78.8 690 454 03 02 26 03 14 30 J1243+4043 14 16 48 72.7 274.1 1.5 78.8 24 454 03 14 25 03 26 00 --- 14 28 20 70.5 275.5 1.7 78.2 690 465 03 14 26 03 29 50 J1243+4043 14 32 11 69.8 275.9 1.8 78.0 224 465 03 29 45 03 41 20 --- 14 43 43 67.7 277.2 2.0 77.3 690 476 03 29 46 03 41 50 J1243+4043 14 44 13 67.6 277.3 2.0 77.3 24 476 03 41 45 03 53 20 --- 14 55 45 65.4 278.5 2.2 76.5 690 487 03 41 46 03 54 10 J1242+3751 14 56 35 64.3 272.2 2.2 70.6 38 487 03 54 05 03 56 10 =1240+381 14 58 35 63.9 272.5 2.3 70.5 120 489 03 54 06 03 57 10 J1243+4043 14 59 35 64.7 278.9 2.3 76.3 48 489 03 57 05 04 08 40 --- 15 11 07 62.6 280.1 2.4 75.5 690 501 03 57 06 04 09 10 J1243+4043 15 11 37 62.5 280.2 2.5 75.4 24 501 04 09 05 04 20 40 --- 15 23 09 60.4 281.3 2.6 74.6 690 512 04 09 06 04 21 30 J1242+3751 15 23 59 59.2 276.1 2.7 69.8 38 512 04 21 25 04 23 30 =1240+381 15 26 00 58.8 276.4 2.7 69.7 120 514 04 21 26 04 24 30 J1243+4043 15 27 00 59.7 281.7 2.7 74.3 48 514 04 24 25 04 36 00 --- 15 38 32 57.6 282.9 2.9 73.4 690 525 04 24 26 04 36 30 J1243+4043 15 39 02 57.5 283.0 2.9 73.4 24 525 04 36 25 04 48 00 --- 15 50 34 55.4 284.1 3.1 72.5 690 536 04 36 26 04 48 50 J1242+3751 15 51 24 54.1 279.6 3.1 68.5 39 536 04 48 45 04 50 50 =1240+381 15 53 24 53.7 279.9 3.2 68.4 120 538 04 48 46 04 55 10 3C345 15 57 45 81.1 99.1 -0.8 -73.4 120 538 04 55 05 05 00 00 --- 16 02 36 82.0 101.0 -0.7 -72.3 290 543 04 55 06 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. Setup file: sess211.H128 Matching groups in /aps3/sched9.4/catalogs/freq.dat: v20cm_1 FD and KP filtered below 1330. SC filtered above 1440 Setup group: 8 Station: VLBA_NL Total bit rate: 128 Format: VLBA1:1 Bits per sample: 2 Sample rate: 8.000 Number of channels: 8 DBE type: Speedup factor: 1.00 Disk used to record data. 1st LO= 2100.00 2100.00 2100.00 2100.00 2100.00 2100.00 2100.00 2100.00 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 VLBA FE= 20cm omit 20cm omit VLBA Synth= 15.4 2.1 15.4 The following frequency sets based on this setup were used. Frequency Set: 9 Based on FREQ, BW, and/or DOPPLER in schedule. Used pcal sets: 1 LO sum= 1390.83 1390.83 1394.77 1394.77 1398.70 1398.70 1402.63 1402.63 BBC fr= 709.17 709.17 705.23 705.23 701.30 701.30 697.37 697.37 Bandwd= 4.000 4.000 4.000 4.000 4.000 4.000 4.000 4.000 The following pulse cal sets were used with this setup: Pulse cal detection set: 1 PCAL = OFF PCALXB1= S1 S2 S3 S4 S5 S6 S7 S8 PCALXB2= M1 M2 M3 M4 M5 M6 M7 M8 PCALFR1= 0 0 0 0 0 0 0 0 PCALFR2= 0 0 0 0 0 0 0 0 Track assignments are: track1= 2, 6, 10, 14, 18, 22, 26, 30 barrel=roll_off SOURCES USED IN RECORDING SCANS -- Parsec scale structure in ISM and the nature of 21-cm absorbers 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). Scan hours are for recording scans only. Baseline hours are only counted for scans above horizon at both ends. Source Source position (RA/Dec) Error (B1950) (J2000) (Date) (mas) * J1243+4043 12 41 32.734570 * 12 43 55.781600 12 44 29.987313 0.00 41 00 22.94680 * 40 43 58.43500 40 40 17.96403 0.00 From catalog imbedded in main SCHED input file. Doppler based on heliocentric frame and optical definition. Velocities: 5051.90 5051.90 5051.90 5051.90 5051.90 5051.90 5051.90 5051.90 8.931 scan and 700.258 baseline hours in setup: sess211.H128 J0927+3902 09 23 55.319213 * 09 27 03.013934 09 27 46.245428 0.29 0923+392 39 15 23.56646 * 39 02 20.85186 38 59 24.55706 0.16 * 4C39.25 /aps3/sched9.4/catalogs/sources.vlba J0927+39 GSFC 2010a astro solution 231732 Observations Doppler based on other sources. 0.167 scan and 18.750 baseline hours in setup: sess211.H128 * J1242+3751 12 40 27.034314 * 12 42 51.369077 12 43 25.855934 0.04 1240+381 38 07 25.41734 * 37 51 00.02525 37 47 18.58321 0.03 J1242+37 /aps3/sched9.4/catalogs/sources.vlba GSFC 2010a astro solution 1290 Observations Doppler based on other sources. 0.800 scan and 62.633 baseline hours in setup: sess211.H128 J1331+3030 13 28 49.657759 * 13 31 08.288051 13 31 41.716249 0.19 * 3C286 30 45 58.64061 * 30 30 32.95925 30 27 03.00073 0.17 1328+307 /aps3/sched9.4/catalogs/sources.vlba J1331+30 GSFC 2010a astro solution 276 Observations Doppler based on other sources. 0.167 scan and 0.833 baseline hours in setup: sess211.H128 J1642+3948 16 41 17.606228 * 16 42 58.809965 16 43 24.330295 0.81 * 3C345 39 54 10.81494 * 39 48 36.99400 39 47 20.92672 0.54 1641+399 /aps3/sched9.4/catalogs/sources.vlba J1642+39 GSFC 2010a astro solution 52595 Observations Doppler based on other sources. 0.236 scan and 18.792 baseline hours in setup: sess211.H128 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) J1243+4043 92.0 4C39.25 57.0 J1242+3751 93.4 3C286 105.8 3C345 117.1 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