{
  "bibcode": "2015GCN.17796....1S",
  "body": "T. Schweyer (MPE Garching), D. A. Kann (TLS Tautenburg), and J. Greiner\n(MPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 150430A (Swift trigger 639433; D'Elia et al.,\nGCN # 17789) simultaneously in g'r'i'z'JHK with GROND (Greiner et al.\n2008, PASP 120, 405) mounted at the 2.2 m MPG telescope at ESO La Silla\nObservatory (Chile).\n\nObservations started at 07:09 UT on 2015-04-30, 6.8 hrs after the GRB\ntrigger. They were performed at an average seeing of 0.9\" and at an\naverage airmass of 1.6.\n\nInside the 1.4\" enhanced XRT error circle (Burrows et al., GCN # 17792)\nand in the nearby surroundings we detect no sources.\n\nBased on 27 min of total exposure time in g'r'i'z' and 20 min in JHK\ncentered 7.56 hrs after the  GRB, we estimate the following preliminary\nupper limits (AB magnitudes):\n\ng' > 24.3 mag,\nr' > 24.3 mag,\ni' > 23.8 mag,\nz' > 23.5 mag,\nJ > 21.5 mag,\nH > 20.8 mag, and\nK > 19.5 mag.\n\nGiven magnitudes are calibrated against GROND zero points (g'r'i'z') as\nwell as 2MASS field stars (JHK) and are not corrected for the expected\nGalactic foreground extinction corresponding to a reddening of\nE_(B-V)=0.03 mag in the direction of the burst (Schlegel et al. 1998)",
  "circularId": 17796,
  "createdOn": 1430434045000,
  "email": "kann@tls-tautenburg.de",
  "subject": "GRB 150430A: GROND Upper Limits",
  "submitter": "Alexander Kann at TLS Tautenburg  <kann@tls-tautenburg.de>",
  "eventId": "GRB 150430A"
}