{
  "bibcode": "2018GCN.23504....1B",
  "body": "J. Bolmer (MPE, Garching) and P. Schady (Univ. of Bath) report:\n\nWe observed again the field of GRB 181201A (INTEGRAL trigger; Mereghetti et al., GCN #23469)\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 01:01 UT on 4. of Dezember 2018, about three days after the\nGRB trigger, and were performed under poor seeing conditions, 2.2'', and at an average\nairmass of 2.0.\n\nWe still detect the afterglow and based on 17 min of total exposure time,\nwe measure the following preliminary r'-band AB magnitude, indicating\nthat the afterglow is still reltively bright, even three days after the\ndetection of the prompt emission:\n\nr' = 19.43 +/- 0.03 mag\n\nGiven magnitude is calibrated against SDSS and not corrected for the\nexpected Galactic foreground extinction corresponding to a reddening of\nE_(B-V)=0.05 in the direction of the burst (Schlafly & Finkbeiner 2011).",
  "circularId": 23504,
  "createdOn": 1543936009000,
  "email": "jan@bolmer.de",
  "subject": "GRB 181201A: Continued GROND observations show that afterglow is still bright",
  "submitter": "Jan Bolmer at MPE/Garching  <jan@bolmer.de>",
  "eventId": "GRB 181201A"
}