{
  "bibcode": "2018GCN.23422....1B",
  "body": "J. Bolmer (MPE, Garching) and P. Schady (Univ. of Bath) report:\n\nWe observed the field of GRB 181110A (Swift trigger 871316; Evans et al., GCN #23413)\nsimultaneously in g'r'i'z'JHK with GROND (Greiner et al. 2008, PASP 120, 405) mounted\nat the 2.2 m MPG telescope at ESO La Silla Observatory (Chile).\n\nObservations started at 00:01 UT, 15.5 hrs after the GRB trigger, and were performed\nunder poor seeing conditions, 4.1���, and at an average airmass of 1.2.\n\nWe detect a source at a position consistent with the X-ray and optical afterglow\n(Evans et al., GCN #23413; Kuin et al., GCN #23419). Based on the first 17 min of\ntotal exposures in g'r'i'z' and 20 min in JHK, we measure the following preliminary\nAB magnitudes:\n\ng' = 21.25 +/- 0.06 mag\nr' = 20.58 +/- 0.05 mag\ni' = 19.91 +/- 0.08 mag\nz' = 20.08 +/- 0.09 mag\nJ = 20.16 +/- 0.20 mag\nH = 19.76 +/- 0.18 mag\nK = 19.27 +/- 0.18 mag\n\nGiven magnitudes are calibrated against USNO and 2MASS field stars and are not corrected\nfor the expected Galactic foreground extinction corresponding to a reddening of E_(B-V)=0.06\nin the direction of the burst (Schlafly & Finkbeiner 2011).",
  "circularId": 23422,
  "createdOn": 1541942224000,
  "email": "jan@bolmer.de",
  "subject": "GROND observations of GRB181110A",
  "submitter": "Jan Bolmer at MPE/Garching  <jan@bolmer.de>",
  "eventId": "GRB 181110A"
}