{
  "bibcode": "2016GCN.19054....1B",
  "body": "J. Bolmer, T. Kruehler, J. Greiner (all MPE Garching) report on behalf\nof the GROND team:\n\nWe observed the field of the INTEGRAL GRB 160221A (Mereghetti et al.,\nGCN #19046) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.\n2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla\nObservatory (Chile).\n\nObservations started at 05:12 UT on 2016-02-22, 5.4 hrs after the GRB\ntrigger. They were performed at an average seeing of 1.0\" and at an\naverage airmass of 1.4.\n\nNo source within the Swift-XRT error circle (Melandri et al.,\nGCN #19050) is detected. Based on 48.0 min of exposure in g'r'i'z'\nand 43.3 min in JHK, at a mid-time of 06:43 UT, we derive the\nfollowing preliminary upper limits:\n\ng' > 23.6 mag\nr' > 24.3 mag\ni' > 23.4 mag\nz' > 23.4 mag\nJ  > 21.8 mag\nH  > 21.1 mag\nK  > 20.0 mag\n\nGiven limits are in the AB system and calibrated against GROND\nzeropoints as well as 2MASS field stars. No correction for the expected\nGalactic foreground extinction corresponding to a reddening of\nE_(B-V)=0.26 mag in the direction of the burst (Schlafly &\nFinkbeiner 2011) has been applied.",
  "circularId": 19054,
  "createdOn": 1456156330000,
  "email": "kruehler@mpe.mpg.de",
  "subject": "GRB 160221A: GROND upper limits",
  "submitter": "Thomas Kruehler at MPE Garching  <kruehler@mpe.mpg.de>",
  "eventId": "GRB 160221A"
}