{
  "bibcode": "2013GCN.15101....1V",
  "body": "K. Varela (MPE Garching), D.A. Kann, S. Klose (both TLS Tautenburg), \nJ. Elliott and J. Greiner (both MPE Garching) report on behalf of \nthe GROND team:\n  \nWe observed the field of GRB 130816A (Holland et al., GCN #15097)\nsimultaneously in g'r'i'z'JHKs with GROND (Greiner et al. 2008, PASP 120,\n405) mounted at the 2.2 m MPG/ESO telescope at La Silla Observatory \n(Chile). \n  \nObservations started at 01:49 UT on 16 August 2013, 3 min after the GRB\ntrigger. We confirm the presence of the NIR source inside the 2.2 arcsec\nSwift-XRT error circle (Holland et al.) found by Covino et al. \n(GCN 15098).\n  \nBased on the first 140 sec g'r'i'z and 240 sec JHK exposure,\nwe estimate preliminary magnitudes (all in AB) of      \n  \ng' = 21.8 +/- 0.2 mag,\nr' = 20.3 +/- 0.1 mag,\ni' = 19.5 +/- 0.1 mag,         \nz' = 18.9 +/- 0.1 mag,         \nJ = 18.0 +/- 0.1 mag,\nH = 17.4 +/- 0.1 mag, and      \nK = 17.1 +/- 0.1 mag,\n  \ncalibrated against GROND zero points (g'r'i'z') and 2MASS (JHK).\nCorrecting for the Galactic foreground extinction corresponding to \na reddening of E_(B-V)= 0.80 in the direction of the burst \n(Schlegel et al. 1998), the SED is well fit with a powerlaw of\nslope 0.8, typical of GRB afterglows.\n\nThe object rapidly faded (by about 1.5 mag) during the following \n40 min., leaving no doubt that this is the afterglow of GRB 130816A.",
  "circularId": 15101,
  "createdOn": 1376649548000,
  "email": "jcg@mpe.mpg.de",
  "subject": "GRB 130816A: GROND confirmation of afterglow",
  "submitter": "Jochen Greiner at MPI  <jcg@mpe.mpg.de>",
  "eventId": "GRB 130816A"
}