{
  "bibcode": "2015GCN.17381....1D",
  "body": "C. Delvaux, K. Varela and J. Greiner (all MPE Garching) report on behalf\nof the GROND team:\n\nWe observed the field of GRB 150202A (SWIFT-629547; Krimm et al., GCN\n#17376) simultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008,\nPASP 120, 405) mounted at the 2.2m MPG telescope at ESO La Silla\nObservatory (Chile).\n\nObservations started on February 3rd, 2015, at 00:43 UT, 1.5 hrs after the\nGRB trigger. They were performed at an average seeing of 1.1\" and at an\naverage airmass of 1.7.\n\nWe do not detect a source inside the 2.1� error circle reported by Krimm\net al. (GCN #17376). Based on a total exposure of 2.07 hours in\ng'r'i'z'and 1.73 hours in JHK, at a midtime of 2 hours after the burst, we\nmeasure the following preliminary upper limits (AB magnitudes system):\n\ng' > 24.2 mag,\nr' > 24.7 mag,\ni' > 24.4 mag,\nz' > 24.4 mag,\nJ  > 22.1 mag,\nH  > 21.5 mag, and\nK  > 18.0 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) = 0.02 mag in the\ndirection of the burst (Schlegel et al. 1998).",
  "circularId": 17381,
  "createdOn": 1422941039000,
  "email": "delvaux@mpe.mpg.de",
  "subject": "GRB 150202A: GROND Upper limits",
  "submitter": "Corentin Delvaux at MPE  <delvaux@mpe.mpg.de>",
  "eventId": "GRB 150202A"
}