{
  "bibcode": "2015GCN.18523....1K",
  "body": "F. Knust, J. Bolmer, T. Kruehler (all MPE Garching), S. Schmidl\n(TLS Tautenburg) and J. Greiner (MPE Garching) report:\n\nWe observed the field of GRB 151029A (Swift trigger 662086,\nUkwatta et al., GCN 18522)  simultaneously in g'r'i'z'JHK\nwith GROND (Greiner et al. 2008, PASP 120, 405) mounted at\nthe 2.2m MPG telescope at ESO La Silla Observatory (Chile).\n\nObservations started at October 29, 2015, 08:33, about\n40 minutes after the GRB trigger. Inside the X-ray error\n(Ukwatta et al., GCN 18522) circle we detect the UVOT\ncounterparts at coordinates\n\nRA: 02:34:06.75\nDecl: -35:23:08.6\n\nwith an error of around 0\".5.\n\nAt a mean time of October 29, 2015, 08:37 UTC, we measure\nthe following preliminary AB magnitudes and upper limits of:\n\n\ng' = 19.9 +- 0.1\nr' = 19.7 +- 0.1\ni' = 19.7 +- 0.1\nz' = 19.7 +- 0.1\nJ = 19.5 +- 0.2\nH > 19.4\nK > 19.4\n\nMagnitudes and upper limts are calibrated against GROND zeropoints\nand 2MASS field stars and are not corrected for the Galactic\nextinction corresponding to a reddening of E_B-V = 0.018 mag\n(Schlafly & Finkbeiner 2011) in the direction of the burst.",
  "circularId": 18523,
  "createdOn": 1446110129000,
  "email": "kruehler@mpe.mpg.de",
  "subject": "GRB 151029A: GROND afterglow observations",
  "submitter": "Thomas Kruehler at MPE Garching  <kruehler@mpe.mpg.de>",
  "eventId": "GRB 151029A"
}