{
  "bibcode": "2011GCN.12096....1F",
  "body": "R. Filgas (MPE Garching), A. Rossi, A.D. Kann (both TLS Tautenburg), \nA. Rau and J. Greiner (both MPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 110625A (Swift trigger 456073; Page et\nal., GCN #12088) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.\n2008, PASP 120, 405) mounted at the 2.2 m MPI/ESO telescope at La Silla\nObservatory (Chile).\n\nObservations started at 02:24 UT on June 26, 5.3 hours after the GRB\ntrigger, continued until 03:11 UT, and were obtained at high airmass. \nA second epoch was obtained starting at 05:35, 8.46 hours after the burst, \nand finished at 07:06 UT.\n\nInside the refined XRT error circle (Page et al., GCN #12092) we found a \nsingle source at\n\n RA,DEC (J2000)= 19:06:55.89, +06:45:19.5\n\n(+-0.3\"), consistent with the source reported by Im at al., GCN #12095.\nOver the course of 5 hrs, no variability is detected in relative photometry \nmeasured against a field star at RA,DEC(J200)=19:06:56.99,+06:45:20.4 \nwith z_AB = 19.4 mag.\n\nWe measure the following magnitudes (all in AB) from the first 1440s and \n1200s of exposure in g'r'i'z' and JHK, respectively:\n\ng' > 24.3\nr' = 24.1 +/- 0.2\ni' = 22.6 +/- 0.1\nz' = 21.5 +/- 0.1\nJ =  21.1 +/- 0.7\nH > 18.6\nK > 17.8\n\nThe photometry were derived by calibration against GROND zeropoints and \n2MASS field stars and are not corrected for the Galactic foreground extinction \ncorresponding to a reddening of E_(B-V) ~ 10.5 mag in the direction of the burst \n(Schlegel et al. 1998).\n\nGiven the lack of variability and a color much bluer than would be expected\naccording to the strong foreground extinction, we suggest that this \noptical/near-IR source is likely a Galactic object unrelated to GRB 110625A.",
  "circularId": 12096,
  "createdOn": 1309104781000,
  "email": "jcg@mpe.mpg.de",
  "subject": "GRB 110625A: GROND detection of a source inside the XRT error circle",
  "submitter": "Jochen Greiner at MPI  <jcg@mpe.mpg.de>",
  "eventId": "GRB 110625A"
}