{
  "bibcode": "2010GCN.11209....1U",
  "body": "A. Updike (Clemson Univ.), A. Nicuesa Guelbenzu, S. Klose (both TLS \nTautenburg), and J. Greiner (MPE Garching), report on behalf of the GROND \nteam:\n\nGROND (Greiner et al. 2008, PASP 120, 405), the 7-channel imager mounted \nat the 2.2m ESO/MPI telescope on La Silla, started follow-up observations \nof GRB 100902A (Sakamoto et al. 2010, GCN 11181) on September 4 at 7:40 UT \n(about 1.5 days after the trigger). Airmass was around 2. Due to bad \nweather on La Silla no earlier observations were possible.\n\nWithin the enhanced 1.5 arcsec XRT error circle (Beardmore et al. 2010, \nGCN 11188) we find a faint source at coordinates RA, DEC (J2000) = \n03:14:30.96, +30:58:44.8 (+/-0.5 arcsec).\n\nPreliminary measured AB mags are:\n\nr' = 24.1 +/- 0.3\ni' = 24.0 +/- 0.4\n\nusing GROND zeropoints.\n\nAt present it is not clear if this is the afterglow or the underling host. \nNo statements about variability or fading can be made at the moment.",
  "circularId": 11209,
  "createdOn": 1283614289000,
  "email": "klose@tls-tautenburg.de",
  "subject": "GRB 100902A: GROND observations; afterglow candidate",
  "submitter": "Sylvio Klose at TLS Tautenburg  <klose@tls-tautenburg.de>",
  "eventId": "GRB 100902A"
}