COVER INFORMATION Station: GBT_VLBA (Code Gb ) Experiment: RadioAstron AGN polarization imaging Exp. Code: gg079a Schedule Version: 1.00 Processed by SCHED version: 11.40 Release 11.4. March 14, 2015 PI: Jose L. Gomez, Andrei Lobanov Address: Instituto de Astrofisica de Andalucia-CSIC Glorieta de la Astronomia E-18008 Granada, Spain Phone: +79165452842 EMAIL: jlgomez@iaa.es, alobanov@mpifr-bonn.mpg.de Fax: Phone during observation: +79165452842 Observing mode: L-band, dual-pol Notes: L-band, Radioastron-compatible frequency setup P-CAL is ON Tsys is ON auto-level (AGC) is ON Schedule for GBT_VLBA (Code Gb ) Page 2 RadioAstron AGN polarization imaging 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 31 Mar 2016 Day 91 --- ---------- This is an 10-min scan for GBT to do POINTING ---------- Next scan frequencies: 1636.00 1636.00 1636.00 1636.00 1668.00 1668.00 1668.00 1668.00 Next BBC frequencies: 764.00 764.00 764.00 764.00 732.00 732.00 732.00 732.00 Next scan bandwidths: 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 06 30 00 1641+399 13 46 54 56.1 73.5 -2.9 -77.8 0 0 Stopped 06 40 00 --- 13 56 56 57.9 74.2 -2.8 -78.8 600 0 06 40 30 1641+399 13 57 26 58.0 74.3 -2.8 -78.8 9 0 06 40 30 06 50 00 --- 14 06 58 59.8 74.9 -2.6 -79.8 570 37 06 40 31 06 50 30 1641+399 14 07 28 59.9 75.0 -2.6 -79.8 9 37 06 50 30 07 00 00 --- 14 16 59 61.7 75.6 -2.4 -80.8 570 73 06 50 31 07 00 30 1641+399 14 17 29 61.8 75.6 -2.4 -80.9 9 73 07 00 30 07 10 00 --- 14 27 01 63.6 76.2 -2.3 -81.9 570 110 07 00 31 07 10 30 1641+399 14 27 31 63.7 76.3 -2.3 -81.9 9 110 07 10 30 07 20 00 --- 14 37 03 65.6 76.8 -2.1 -82.9 570 147 07 10 31 07 20 30 1641+399 14 37 33 65.6 76.8 -2.1 -83.0 9 147 07 20 30 07 30 00 --- 14 47 04 67.5 77.4 -1.9 -84.0 570 184 07 20 31 07 30 30 1641+399 14 47 34 67.6 77.4 -1.9 -84.1 9 184 07 30 30 07 40 00 --- 14 57 06 69.4 77.9 -1.8 -85.2 570 220 07 30 31 07 40 30 1641+399 14 57 36 69.5 77.9 -1.8 -85.2 9 220 07 40 30 07 50 00 --- 15 07 07 71.3 78.3 -1.6 -86.4 570 257 07 40 31 07 50 30 1641+399 15 07 38 71.4 78.3 -1.6 -86.4 9 257 07 50 30 07 59 30 --- 15 16 39 73.1 78.6 -1.4 -87.6 540 292 07 50 31 ---------- L-band VLBI scans. Space segment 05 ---------- 08 00 00 1641+399 15 17 09 73.2 78.6 -1.4 -87.7 9 292 08 00 00 08 16 20 --- 15 33 32 76.4 78.8 -1.2 -90.1 980 355 08 00 01 08 16 50 1641+399 15 34 02 76.5 78.8 -1.2 -90.1 9 355 08 16 50 08 33 10 --- 15 50 25 79.6 78.4 -0.9 -93.2 980 418 08 16 51 08 33 40 1641+399 15 50 55 79.7 78.4 -0.9 -93.3 9 418 08 33 40 08 50 00 --- 16 07 17 82.8 76.3 -0.6 -97.9 980 481 08 33 41 Schedule for GBT_VLBA (Code Gb ) Page 3 RadioAstron AGN polarization imaging 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 31 Mar 2016 Day 91 --- ---------- Ground-only segment 06 ---------- 08 50 30 1641+399 16 07 47 82.9 76.2 -0.6 -98.1 9 481 08 50 30 09 00 00 --- 16 17 19 84.7 73.1 -0.4 -102.7 570 518 08 50 31 SETUP FILE INFORMATION: NOTE: If DOPPLER, FREQ, or BW were used, see the individual scans for the final BBC settings. ======== Setup file: ra18cm2.set Matching groups in ./gg079a_freq.dat: g20cm_2 LO1=4.632, LO2=12.732, LO3=10.5 Setup group: 11 Station: GBT_VLBA Total bit rate: 512 Format: VDIF Bits per sample: 2 Sample rate: 32.000 Number of channels: 8 DBE type: RDBE_DDC Speedup factor: 1.00 Disk used to record data. 1st LO= 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 2400.00 Net SB= L L U U L L U U IF SB = L L L L L L L L Pol. = RCP LCP RCP LCP RCP LCP RCP LCP BBC = 1 2 3 4 5 6 7 8 BBC SB= U U L L U U L L IF = A C A C A C A C The following frequency sets based on these setups were used. Frequency Set: 55 Setup file default. Used with PCAL = 1MHz LO sum= 1636.00 1636.00 1636.00 1636.00 1668.00 1668.00 1668.00 1668.00 BBC fr= 764.00 764.00 764.00 764.00 732.00 732.00 732.00 732.00 Bandwd= 16.00 16.00 16.00 16.00 16.00 16.00 16.00 16.00 VLBA legacy crd files using 4 channels based on RDBE channels: 3 4 5 6 CRD fr= 764.01 764.01 731.99 731.99 CRD bw= 16.00 16.00 16.00 16.00 Matching frequency sets: 55 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) * FAKERA 11 57 21.769299 * 12 00 00.000000 12 00 56.741257 0.00 85 16 41.77889 * 85 00 00.00000 84 54 38.38204 0.00 From catalog imbedded in main SCHED input file. fake circumpolar target for a TS to look at 1328+307 13 28 49.657778 * 13 31 08.288070 13 31 54.206774 0.00 J1331+3030 30 45 58.64060 * 30 30 32.95924 30 25 28.58949 0.00 * 3C286 ./gg079a_sources.radioastron WSRT calibrator, not for 92cm, rfc_2013d Petrov, 2013, unpublished 542 observati 0316+413 03 16 29.567283 * 03 19 48.160114 03 20 51.642341 0.00 J0319+4130 41 19 51.91847 * 41 30 42.10559 41 34 05.47448 0.00 * 3C84 ./gg079a_sources.radioastron AGN, rfc_2013d Petrov, 2013, unpublished 15448 observations, RA-AO3-04, RA-AO2-1 0851+202 08 51 57.250618 * 08 54 48.874930 08 55 44.920816 0.00 J0854+2006 20 17 58.41733 * 20 06 30.64078 20 02 37.68080 0.00 * OJ287 ./gg079a_sources.radioastron AGN, rfc_2013d Petrov, 2013, unpublished 213710 observations, RA-AO3-04, RA-AO3- * 1641+399 16 41 17.606226 * 16 42 58.809963 16 43 32.203998 0.00 J1642+3948 39 54 10.81479 * 39 48 36.99385 39 46 41.97815 0.00 3C345 ./gg079a_sources.radioastron AGN, rfc_2013d Petrov, 2013, unpublished 51938 observations, RA-AO3-04, RA-AO3-0 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 FAKERA ra18cm2.set 12 4.083 0.000 3C286 ra18cm2.set 1 2 3 4 5 6 7 8 11 13 14 25 0.883 55.135 3C84 ra18cm2.set 25 0.083 3.750 ra6cm2.set 45 0.067 3.000 ra4cm2.set 15 0.083 3.750 ra2cm2.set 35 0.100 4.500 OJ287 ra18cm2.set 25 1.000 29.800 ra6cm2.set 45 0.767 21.933 ra4cm2.set 15 0.944 28.967 ra2cm2.set 35 1.256 34.817 1641+399 ra18cm2.set 1 2 3 4 5 6 7 8 11 13 14 25 + 10.694 1261.236 ra6cm2.set 45 0.333 15.000 ra4cm2.set 15 0.417 18.750 ra2cm2.set 35 0.500 22.475 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) FAKERA 90.7 3C286 143.1 3C84 51.7 OJ287 119.8 1641+399 109.0 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