TITLE: GCN CIRCULAR NUMBER: 14953 SUBJECT: GRB 130701A: Swift detection of a burst DATE: 13/07/01 04:31:19 GMT FROM: David Palmer at LANL N. P. M. Kuin (UCL-MSSL), D. Malesani (DARK/NBI), K. L. Page (U Leicester), D. M. Palmer (LANL), T. Sakamoto (AGU), M. Stamatikos (OSU/NASA/GSFC) and T. N. Ukwatta (MSU) report on behalf of the Swift Team: At 04:17:43 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 130701A (trigger=559482). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 357.216, +36.099 which is RA(J2000) = 23h 48m 52s Dec(J2000) = +36d 05' 58" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a double-peaked structure with a duration of about 8 sec. The peak count rate was ~10304 counts/sec (15-350 keV), at ~1 sec after the trigger. The XRT began observing the field at 04:19:09.1 UT, 85.5 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 357.2287, 36.0997 which is equivalent to: RA(J2000) = +23h 48m 54.89s Dec(J2000) = +36d 05' 58.9" with an uncertainty of 5.3 arcseconds (radius, 90% containment). This location is 37 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. UVOT took a finding chart exposure of 250 seconds with the U filter starting 150 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.2 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18.0 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.09. Burst Advocate for this burst is N. P. M. Kuin (n.kuin AT ucl.ac.uk). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)