{
  "bibcode": "2014GCN.16872....1G",
  "body": "J. Graham (MPE Garching), A. Nicuesa Guelbenzu (TLS Tautenburg), J. Bolmer \nand J. Greiner (both at MPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 140930B (Swift trigger 614094; De Pasquale et \nal., GCN #16857) 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 La Silla \nObservatory (Chile).\n\nObservations started at 02:25 UT on 1 October 2014, around 7 hours after \nthe GRB trigger. They were performed at an average seeing of 1.4\" and at \nan average airmass of 1.9.\n\nWe detect the afterglow candidate reported by Tanvir et al. (GCN #16861) \nand confirmed by Fong et al. (GCN #16863). At a midtime of 03:00 UT we \nmeasure a preliminary AB magnitude of\n\nr' = 23.2 +/- 0.2 mag.\n\nThe analysis of the other GROND photometric bands is still on-going. We \nnote that the photometry is slightly affected by a bright star next to the \nafterglow.\n\nThe given magnitude is calibrated against SDSS field stars and not \ncorrected for the expected Galactic foreground extinction corresponding to \na reddening of E_(B-V)=0.04 mag in the direction of the burst (Schlegel et \nal. 1998).",
  "circularId": 16872,
  "createdOn": 1412194578000,
  "email": "klose@tls-tautenburg.de",
  "subject": "GRB 140930B: GROND observations",
  "submitter": "Sylvio Klose at TLS Tautenburg  <klose@tls-tautenburg.de>",
  "eventId": "GRB 140930B"
}