TITLE: GCN CIRCULAR NUMBER: 10837 SUBJECT: GRB 100614A: Swift detection of a burst DATE: 10/06/14 22:09:01 GMT FROM: Scott Barthelmy at NASA/GSFC G. Stratta (ASDC), S. D. Barthelmy (GSFC), W. H. Baumgartner (GSFC/UMBC), D. N. Burrows (PSU), V. D'Elia (ASDC), J. M. Gelbord (PSU), C. Gronwall (PSU), S. T. Holland (CRESST/USRA/GSFC), J. A. Kennea (PSU), H. A. Krimm (CRESST/GSFC/USRA), N. P. M. Kuin (UCL-MSSL), W.B Landsman (GSFC), J. Mao (INAF-OAB), F. E. Marshall (NASA/GSFC), J. P. Osborne (U Leicester), T. Sakamoto (NASA/UMBC), C. J. Saxton (UCL-MSSL), B. Sbarufatti (INAF-OAB/IASFPA), M. Stamatikos (OSU/NASA/GSFC), T. N. Ukwatta (GSFC/GWU) and L. Vetere (PSU) report on behalf of the Swift Team: At 21:38:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 100614A (trigger=424716). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 263.519, +49.227, which is RA(J2000) = 17h 34m 05s Dec(J2000) = +49d 13' 36" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is typical for image triggers, the TDRSS lightcurve does not show anything significant. The XRT began observing the field at 21:40:39.1 UT, 133.0 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source with an enhanced position: RA, Dec 263.4992, 49.2347 which is equivalent to: RA(J2000) = 17h 33m 59.81s Dec(J2000) = +49d 14' 05.1" with an uncertainty of 2.1 arcseconds (radius, 90% containment). This position may be improved as more data are received; the latest position is available at http://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density in excess of the Galactic value (2.2e+20 cm^-2, Kalberla et al. 2005), with an excess column of 1.3 (+1.11/-1.03) x 10^21 cm^-2 (90% confidence). The initial flux in the 0.1 s image was 4.41e-08 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of nominal 250 seconds with the U filter starting 873 seconds after the BAT trigger. No white observations were taken because there is a V = 7.4 star in the UVOT field of view. The UVOT image covers 100% of the XRT error circle. No credible afterglow candidate has been found in the initial data products to an estimated magnitude limit of u > 19.2. No correction has been made for the expected extinction corresponding to E(B-V) of 0.03 mag. Burst Advocate for this burst is G. Stratta (giulia.stratta AT asdc.asi.it). 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.)