{
  "bibcode": "2011GCN.12353....1E",
  "body": "J. Elliott (MPE Garching), D. A. Kann (Tautenburg Obs.), and J. Greiner\n(also MPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 110915A (Swift trigger 503219; Holland et\nal., GCN 12335) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.\n2008, PASP 120, 405) mounted at the 2.2m MPI/ESO telescope at La Silla\nObservatory (Chile).\n\nObservations started at 23:26 UT on 15 September, 10.1 hours after the GRB\ntrigger. They were performed at an average seeing of 1.1 and at an average\nairmass of 1.2.\n\nWe do not detect a source within the enhanced UVOT/Swift-XRT error circle\nreported by Evans et al. (GCN 12340). For a total exposure time of 6003 s\nin g'r'i'z' and 4800 s in JHK, we do not detect a source down to:\n\ng' > 25.5,\n\nr' > 25.4,\n\ni' > 24.3,\n\nz' > 23.8,\n\nJ > 21.2,\n\nH > 20.0, and\n\nK > 18.6\n\nThe given limits are derived based on calibrating the images against GROND\nzeropoints (g'r'i'z' are AB mags) and 2MASS field stars (JHK are Vega\nmags) and are not corrected for the Galactic foreground extinction\ncorresponding to a reddening of E(B-V) = 0.058 in the direction of the\nburst (Schlegel et al. 1998).\n\nThese upper limits are in agreement with the i/z upper limits from Perley\net al. (GCN 12346) and the J/Ks upper limits from Berger et al. (GCN\n12349).\n\n[GCN OPS NOTE(16sep11): Per author's request, the date in the second paragraph\nwas corrected from \"16 Sep\" to \"15 Sep\", and Perley citation was changed\nfrom \"12345\" to \"12346\".]",
  "circularId": 12353,
  "createdOn": 1316197962000,
  "email": "kann@tls-tautenburg.de",
  "subject": "GRB 110915A: GROND Upper limits",
  "submitter": "Alexander Kann at TLS Tautenburg  <kann@tls-tautenburg.de>",
  "eventId": "GRB 110915A"
}