{
  "bibcode": "2013GCN.15328....1S",
  "body": "V. Sudilovsky, M. Tanga,\nand J. Greiner (all MPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 131011A (Kasliwal et al., GCN #15324)\nsimultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120,\n405) mounted at the 2.2 m MPG telescope at La Silla Observatory\n(Chile).\n\nObservations started at 03:30 UT on 13 October 2013.\nThey were performed at an average seeing of 1.3\" and at and\naverage airmass of 1.2. We find the afterglow candidate reported by Kasliwal et al.\n\nBased on the first 1500 sec g'r'i'z' and 1200 sec JHK exposure,\nwe estimate preliminary magnitudes (all in AB) of\n\ng' = 21.9 � 0.1 mag\nr' = 21.7 � 0.1 mag,\ni' = 21.5 � 0.1 mag,\nz' = 21.3 � 0.1 mag,\nJ = 21.1 � 0.1 mag,\nH = 20.5 � 0.2 mag,\nK = 20.2 � 0.4 mag,\n\nMagnitudes are calibrated against nearby SDSS (griz) and 2MASS (JHK) stars, and\nare not corrected for the Galactic foreground extinction corresponding to\na reddening of E_(B-V)= 0.02 mag in the direction of the burst\n(Schlegel et al. 1998).",
  "circularId": 15328,
  "createdOn": 1381650109000,
  "email": "vsudilov@mpe.mpg.de",
  "subject": "GRB 131011A: GROND afterglow observations",
  "submitter": "Vladimir Sudilovsky at MPE  <vsudilov@mpe.mpg.de>",
  "eventId": "GRB 131011A"
}