{
  "bibcode": "2015GCN.18598....1B",
  "body": "J. Bolmer, J. Graham, F. Knust and J. Greiner (all MPE Garching) report:\n\nWe reobserved the field of GRB 151111A (Swift trigger 663074; Page et al., GCN 18578) simultaneously in g���r���i���z���JHK\nwith GROND (Greiner et al. 2008, PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla Observatory (Chile).\n\nObservations started at 05:31:33 UT on November 13, about 1.9 days after the GRB trigger.\nThe initially reported source at the coordinates of RA, Dec = 56.84483, -44.16201 (+/- 0.2���) (Graham et al. GCN 18585)\nhas clearly faded (e.g. in the r��� band from 22.19 +/- 0.04 to 22.68 +/- 0.05 mag) and we thus conclude that this source is the optical afterglow of GRB 151111A.\n\nFurthermore, after correcting for the galactic foregorund E(B-V)=0.01 mag, and\nfitting a powerlaw model to the 7-cannel GROND SED from the first night,\nwe derive a photometric redshift of z = 3.5 +/- 0.3, according to the g'-band dropout\nwith g'-r��� =  1.3 mag.",
  "circularId": 18598,
  "createdOn": 1447437687000,
  "email": "jan@bolmer.de",
  "subject": "GRB 151111A: GROND confirmation of the afterglow and photometric redshift estimate",
  "submitter": "Jan Bolmer at MPE/Garching  <jan@bolmer.de>",
  "eventId": "GRB 151111A"
}