{
  "bibcode": "2007GCN..6917....1K",
  "body": "D. A. Kann, C. Hoegner & R. Filgas (TLS Tautenburg) report:\n\nWe observed the field of GRB 071013 (Marshall et al., GCN 6907) with the \nTautenburg 1.34m Schmidt telescope under good conditions, obtaining 13 600 \nsecond images in the Rc band. Within the revised BAT error circle (Palmer \net al., GCN 6911), we find no new sources in comparison to the DSS. We \nnote that our stacked image is much deeper than the DSS, and contains many \nadditional faint sources. More precise analysis awaits the publication of \na Swift XRT position.\n\nAssuming the USNO B1.0 star at RA (J2000) = 18:38:05.67, Dec. (J2000) = \n+33:54:14.61 to have R2=17.22, we derive the following magnitude limit for \nregions not close to bright stars:\n\nDate\t\tMid-Time\tRc limit (2 sigma)\n\n13.79254\t0.28608\t\t23.0\n\nThis message may be cited.",
  "circularId": 6917,
  "createdOn": 1192478921000,
  "email": "kann@tls-tautenburg.de",
  "subject": "GRB 071013: TLS Upper Limit",
  "submitter": "Alexander Kann at TLS Tautenburg  <kann@tls-tautenburg.de>",
  "eventId": "GRB 071013"
}