{
  "bibcode": "2014GCN.16899....1S",
  "body": "S. Schmidl (TLS Tautenburg), J. F. Graham, and J. Greiner\n(both MPE Garching) report on behalf of the GROND team:\n\nWe observed the field of GRB 141004A (Swift trigger 614390; V. D'Elia et\nal., GCN #16878) 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\nWe detect the afterglow at the UVOT position reported by V. D'Elia et al.\n(GCN #16878). From coadded observations, starting on October 06 and\nspanning from 05:31 to 09:09 UT, we report the following preliminary AB\nmagnitudes of:\n\ng' = 24.6 +/- 0.3,\nr' = 24.0 +/- 0.2,\ni' = 23.5 +/- 0.2, and\nz' = 23.4 +/- 0.2.\n\nGiven magnitudes are calibrated against GROND zeropoints and\nare not corrected for the expected Galactic foreground extinction\ncorresponding to a reddening of E_(B-V)=0.32 mag in the direction of the\nburst (Schlegel et al. 1998).",
  "circularId": 16899,
  "createdOn": 1412623399000,
  "email": "schmidl@tls-tautenburg.de",
  "subject": "GRB 141004A: GROND observations",
  "submitter": "Sebastian Schmidl at TLS Tautenburg  <schmidl@tls-tautenburg.de>",
  "eventId": "GRB 141004A"
}