{
  "bibcode": "2015GCN.18595....1K",
  "body": "F. Knust, T.-W. Chen and J. Greiner (all MPE Garching) report on behalf of\nthe GROND team:\n\nWe observed the field of GRB 151112A (Swift trigger 663179; Malesani et\nal., GCN #18588) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.\n2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at the ESO La\nSilla Observatory (Chile).\n\nObservations started at 00:09 UT on 2015-11-13, 10.5hrs after the GRB\ntrigger, and are continuing. They were performed at an average seeing of\n1.8\" and at an average airmass of 1.2.\n\nWe found a single point source within the 1.4\" Swift-XRT error circle\nreported by Osborne et al. (GCN #18592) at\n\nRA (J2000.0) = 00h 08m 12.77s\n\nDEC (J2000.0) = -61d 39' 48.4\"\n\nwith an uncertainty of 0.5\" in each coordinate.\n\nBased on 11.50 min of total exposures in g'r'i'z' and 12.00 min in JHK, we\nestimate preliminary magnitudes (all in AB system) of\n\ng' > 23.9 mag,\nr' = 23.9 +/- 0.373 mag,\ni' = 22.4 +/- 0.169 mag,\nz' = 22.5 +/- 0.288 mag,\nJ  > 21.0 mag,\nH  > 20.5 mag, and\nK  > 19.0 mag.\n\n\nGiven magnitudes are calibrated against GROND zeropoints as well as 2MASS\nfield stars and are not corrected for the expected Galactic foreground\nextinction corresponding to a reddening of E_(B-V)=0.01 mag in the\ndirection of the burst (Schlegel et al. 1998).",
  "circularId": 18595,
  "createdOn": 1447378030000,
  "email": "fknust@mpe.mpg.de",
  "subject": "GRB 151112A: GROND Detection of the Optical/NIR Afterglow Candidate",
  "submitter": "Fabian Knust at MPE/GROND  <fknust@mpe.mpg.de>",
  "eventId": "GRB 151112A"
}