{
  "subject": "GRB 180510B: GROND detection in all bands",
  "eventId": "GRB 180510B",
  "bibcode": "2018GCN.22701....1S",
  "createdOn": 1526037126000,
  "circularId": 22701,
  "submitter": "Patricia Schady at MPE/Swift  <pschady@mpe.mpg.de>",
  "email": "pschady@mpe.mpg.de",
  "body": "P. Schady (MPE, Garching) reports:\n\nWe observed the field of GRB 180510B (Swift trigger 831816; Tohuvavohu et\nal., GCN #22696) 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 23:14 UT on 10th May, 3.0 hours after the GRB\ntrigger. They were performed at an average seeing of 1.3\" and at an\naverage airmass of 1.8.\n\nA single point source is present within the 1.5\" Swift-XRT error circle\nreported by Beardmore et al. (GCN #22698) at\n\nRA (J2000.0) = 05:11:52.66\nDEC (J2000.0) = -62:19:26.4\n\nwith an uncertainty of 0.2\" in each coordinate.\n\nBased on 6.6 min of total exposures in g'r'i'z' and 6 min in JHK, the\nestimated AB magnitudes are\n\ng' = 20.5 +/- 0.1 mag\nr' = 20.0 +/- 0.1 mag\ni' = 19.8 +/- 0.1 mag\nz' = 19.6 +/- 0.1 mag\nJ = 18.8 +/- 0.1 mag\nH = 18.5 +/- 0.1 mag\nK = 18.0 +/- 0.1 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 in the direction\nof the burst (Schlafly & Finkbeiner 2011).\n\nI would like to thank Markus Rabus for his excellent support from La Silla."
}