{
  "bibcode": "2015GCN.17286....1V",
  "body": "A.J. van der Horst (Univ. of Amsterdam), K. Wiersema (Univ. of Leicester),\nA.J. Levan (Univ. of Warwick), J. Hjorth (DARK/NBI), N.R. Tanvir (Univ.\nof Leicester) report on behalf of a large collaboration:\n\n\"We observed the position of GRB 150101B/Swift J123205.1-105602 at 4.9 GHz\nwith the Westerbork Synthesis Radio Telescope at January 7 00.30 to 09.15\nUT, i.e. 5.38 - 5.74 days after the burst (GCN 17267).\nWe detect two radio sources within the BAT error circle (GCN 17267), with\nflux densities of 7.21 +/- 0.07 and 0.99 +/- 0.18 mJy. The brightest\nsource coincides with the XRT position (GCN 17268), the position of the\ngalaxy 2MASX J12320498-1056010 (GCN 17271), and the NRAO VLA Sky Survey\nsource at 1.4 GHz (GCN 17285). The spectral index from 1.4 to 4.9 GHz of\nthis source is -0.3, consistent with the radio emission emanating from\nan AGN (GCN 17285).\nThe second source is located at\nRA (J2000) = 12:32:08.2\nDec (J2000) = -10:56:14\nwith an uncertainty of 5\", which is large because of its low declination.\nThere is no counterpart of this source in a stacked XRT image, no optical\ncounterpart in our VLT observation (GCN 17281), and also not at 1.4 GHz\nin the NRAO VLA Sky Survey.\n\nWe would like to thank the WSRT staff for scheduling and obtaining\nthese observations.\"",
  "circularId": 17286,
  "createdOn": 1420662351000,
  "email": "A.J.vanderHorst@uva.nl",
  "subject": "GRB 150101B/Swift J123205.1-105602: WSRT radio observation",
  "submitter": "Alexander van der Horst at U of Amsterdam  <A.J.vanderHorst@uva.nl>",
  "eventId": "GRB 150101B"
}