{
  "bibcode": "2013GCN.14309....1S",
  "body": "B. Stecklum, D. A. Kann and C. Hoegner (TLS Tautenburg) report:\n\nFollowing the announcement of the ground-detection of the bright GRB\n130305A by Swift BAT (Cummings & Palmer 2013, GCN 14257), which was also\ndetected by Fermi LAT (Guiriec et al. 2013, GCN 14260), Fermi GBM (Yu &\nXiong 2013, GCN 14261) and Konus-Wind (Golenetskii et al. 2013, GCN\n14262), we initiated observations with the 1.34m Schmidt telescope of the\nThueringer Landessternwarte Tautenburg under excellent weather conditions\nat 18:11 UT, 22 minutes after the GCN notice.\n\nWe obtained 6 x 600 sec exposures in the Rc band, centered 0.29299 days\nafter the GRB. At the position of the XRT afterglow (Malesani et al. 2013,\nGCN 14263, Zhang et al. 2013, GCN 14276), we detect no source down to a 2\nsigma upper limit of Rc > 23.2. Photometric calibration was obtained with\nrespect to several SDSS stars in the field, using the transformations of\nLupton (2005).\n\nThis upper limit is deeper than the one obtained by Kumar & Pandey (2013,\nGCN 14274) at a similar time and earlier than several other reported\nobservations (Cenko 2013, GCN 14265; Butler et al. 2013, GCN 14267;\nBreeveld et al. 2013, GCN 14268). We detect all the surrounding sources\nseen in the deep Gemini image (Cucchiara et al. 2013, GCN 14272).\n\nA second observation was attempted a day later, but due to inclement\nweather conditions only a single 600 sec image could be successfully\nobtained. It is significantly shallower than the stack of the first night\nand shows no changes.\n\nThis message may be cited.",
  "circularId": 14309,
  "createdOn": 1363306812000,
  "email": "kann@tls-tautenburg.de",
  "subject": "GRB 130305A: TLS Tautenburg observations",
  "submitter": "Alexander Kann at TLS Tautenburg  <kann@tls-tautenburg.de>",
  "eventId": "GRB 130305A"
}