{
  "bibcode": "2015GCN.17602....1W",
  "body": "P. Wiseman, K. Varela, M.Salvato and J. Greiner (all MPE Garching) report\non behalf of the GROND team:\n\nWe observed the field of GRB 150318A (SWIFT-635289; Pagani et al.,\nGCN#17599) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.\n2008,PASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla\nObservatory (Chile). Observations started on March 18rd, 2015, at 08:27UT,\n83 minutes after the GRB trigger. They were performed at an average seeing\nof 1.3\" and at an average airmass of 2.0.\n\nWe do not detect a source inside the 1.9 arcsec error circle reported by\nEvans et al. (GCN #17600). Based on a total exposure of 0.67 hours in\ng�r'i'z'and 0.73 hours in JHK, we measure the following preliminary upper\nlimits (AB magnitudes system):\n\ng' > 24.9 mag,\nr' > 24.8 mag,\ni' > 24.2 mag,\nz' > 23.9 mag,\nJ > 21.4 mag,\nH > 20.9 mag, and\nK > 18.9 mag.\n\nGiven magnitudes are calibrated against GROND zeropoints as well as 2MASS\nfield stars and are not corrected for the expected Galactic foreground\nextinction corresponding to a reddening of E_(B-V) = 0.03 mag in the\ndirection of the burst (Schlegel et al. 1998).",
  "circularId": 17602,
  "createdOn": 1426684478000,
  "email": "kvarela@mpe.mpg.de",
  "subject": "GRB 150318A : GROND upper limits",
  "submitter": "Karla Varela at MPE  <kvarela@mpe.mpg.de>",
  "eventId": "GRB 150318A"
}