{
  "bibcode": "2015GCN.18680....1W",
  "body": "P. Wiseman, T. Kruehler (both MPE Garching), D. A. Kann (TLS\nTautenburg), C. Delvaux, and J. Greiner (both MPE Garching) report on\nbehalf of the GROND team:\n\nWe observed the field of GRB 151210A (Swift trigger 666931; Evans et\nal., GCN #18678) simultaneously in g'r'i'z'JHK with GROND (Greiner et\nal. 2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La\nSilla Observatory (Chile).\n\nObservations started at 03:17:35 UT on 10/12/2015, 279 sec after the\nGRB trigger, and are ongoing.\n\nWe detect a source not seen in the DSS at the edge of the refined XRT\nerror circle (Evans et al., GCN #18678) at:\n\nRA (J2000) = 04:20:27.91\nDec. (J2000) = -71:15:02.6\n\nwith an error of 0\".5 in each coordinate. We suggest that this is the\nafterglow of the GRB, as we also detect fading between observations. This\nsource is also seen by LCOGT (Han et al., GCN #18679).\n\nBased on observations with an integration time of 594 sec (griz) and\n540 sec (JHK) centered 54 min after the GRB trigger, we derive\nmagnitudes\n\ng' = 23.9 +/- 0.2  mag,\nr' = 22.1 +/- 0.1 mag,\ni' = 21.7 +/- 0.1 mag,\nz' = 21.2 +/- 0.1 mag,\nJ = 20.3 +/- 0.2 mag, and\nH = 19.8 +/- 0.2 mag.\n\nThe given limits are derived based on calibrating the images against\nGROND zero points and 2MASS field stars and are not corrected for the\nGalactic foreground extinction corresponding to a reddening of E_(B-\nV)= 0.11 in the direction of the burst (Schlafly & Finkbeiner 2011).",
  "circularId": 18680,
  "createdOn": 1449725983000,
  "email": "kann@tls-tautenburg.de",
  "subject": "GRB 151210A: GROND Afterglow Confirmation",
  "submitter": "Alexander Kann at TLS Tautenburg  <kann@tls-tautenburg.de>",
  "eventId": "GRB 151210A"
}