{
  "bibcode": "2016GCN.19292....1Y",
  "body": "R Yates, T-W Chen, and J Greiner (all MPE Garching) report on behalf of\nthe GROND team:\n\nWe observed the field of GRB 160411A (Swift trigger 682339; Page et al.,\nGCN #19279) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008,\nPASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla\nObservatory (Chile).\n\nObservations started at 09:14 UT on 11-04-2016, 7 hr 45 min after the GRB\ntrigger. They were performed at an average seeing of 1.9\" in the r'-band\nand at an average airmass of 1.8.\n\nBased on the first 49 min of total exposures, we do not detect a source\nwithin the 4.0\" Swift-XRT error circle reported by Perri et al. (GCN\n#19281) down to (all in the AB system):\n\ng' > 23.7 mag,\nr' > 23.9 mag,\ni' > 23.1 mag,\nz' > 22.9 mag,\nJ > 21.3 mag,\nH > 20.8 mag, and\nK > 19.9 mag.\n\nThe given limits are derived based on calibrating the images against GROND\nzeropoints and 2MASS field stars and are not corrected for the Galactic\nforeground extinction corresponding to a reddening of E_(B-V)=0.02 mag in\nthe direction of the burst (Schlafly & Finkbeiner 2011).",
  "circularId": 19292,
  "createdOn": 1460398750000,
  "email": "robyates@mpe.mpg.de",
  "subject": "GRB 160411A: GROND Optical/NIR upper limits",
  "submitter": "Robert Yates at MPE/Swift  <robyates@mpe.mpg.de>",
  "eventId": "GRB 160411A"
}