{
  "bibcode": "2009GCN.10091....1F",
  "body": "Robert Filgas (Tautenburg Obs.), Adria Updike (Clemson University), Arne\nRau, and Jochen Greiner (both MPE Garching) report on behalf of the GROND\nteam:\n\nWe observed the field of GRB 091026 (Swift trigger 373871; Markwardt et\nal., GCN #10081) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.\n2008, PASP 120, 405) mounted at the 2.2 m ESO/MPI telescope at La Silla\nObservatory (Chile).\n\nObservations started at 00:48 UT on Oct 27, 2009, 11.6 hours after the GRB\ntrigger.  They were performed at an average seeing of 2\" and at an average\nairmass of 1.94.\n\nWe do not detect a source within the Swift-XRT error circle reported by\nEvans et al. (GCN #10084) down to\n\ng' > 24.8 mag,\n\nr' > 24.2 mag,\n\ni' > 23.9 mag,\n\nz' > 23.7 mag,\n\nJ > 22.2 mag,\n\nH > 21.3 mag and\n\nK > 20.2 mag.\n\nMagnitudes are given in the AB system and calibrated against USNO as well\nas 2MASS field stars, and are not corrected for the expected Galactic\nforeground extinction corresponding to a reddening of E_(B-V) = 0.13 mag\nin the direction of the burst (Schlegel et al. 1998).",
  "circularId": 10091,
  "createdOn": 1256621900000,
  "email": "aupdike@clemson.edu",
  "subject": "GRB 091026: GROND Upper Limits",
  "submitter": "Adria C. Updike at Clemson U  <aupdike@clemson.edu>",
  "eventId": "GRB 091026"
}