{
  "bibcode": "2010GCN.11141....1D",
  "body": "P. D'Avanzo (INAF-OAB), A.J. Levan (U. Warwick), D. Malesani (DARK/NBI),\nN.R. Tanvir (U. Leicester), E. Palazzi (INAF-IASFBo), A. Fiorenzano\n(INAF-TNG), report:\n\nWe observed the field of GRB 100823A (Mangano et al. GCN 11135) using the\nItalian 3.6m TNG telescope, located in the Canary Islands. A set of J-band\nimages were acquired on Aug 24.03490 UT (~7.4 hours after the burst; mid\nexposure time) for a total exposure time of 16 minutes.\n\nWe detect the two objects reported by Levan et al. (GCN 11138) and Guziy\net al. (GCN 11140) with magnitudes J=21.0 for object \"A\" (the one within\nthe refined XRT error circle; Goad et al. GCN 11136) and J=19.4 for object\n\"B\", calibrated against the 2MASS catalogue.\n\nAlthough we have yet to photometrically calibrate the z-band image, from a\ncomparison of the TNG and WHT images (Levan et al. GCN 11138) we note that\nobject \"B\" has a z-J color significantly redder with respect to the\naverage color of field stars.\n\nAs suggested by Levan et al (GCN 11138) object \"B\" can thus be a red\nsource not visible in the DSS2 red image. In light of this, its location\noutside the XRT refined error circle would make it likely unrelated to the\nGRB.",
  "circularId": 11141,
  "createdOn": 1282651357000,
  "email": "paolo.davanzo@brera.inaf.it",
  "subject": "GRB 100823A: TNG NIR observations",
  "submitter": "Paolo D'Avanzo at INAF-OAB  <paolo.davanzo@brera.inaf.it>",
  "eventId": "GRB 100823A"
}