TITLE: GCN CIRCULAR NUMBER: 9666 SUBJECT: GRB 090715: Swift detection of a short hard burst DATE: 09/07/15 17:44:43 GMT FROM: David Palmer at LANL J. L. Racusin (PSU), W. H. Baumgartner (GSFC/UMBC), N. Gehrels (NASA/GSFC), C. Gronwall (PSU), D. Grupe (PSU), S. T. Holland (CRESST/USRA/GSFC), R. Margutti (Univ Bicocca&OAB), K. L. Page (U Leicester), D. M. Palmer (LANL), P. Romano (INAF-IASFPA), M. H. Siegel (PSU), M. Stamatikos (NASA/ORAU) and L. Vetere (PSU) report on behalf of the Swift Team: At 17:25:39 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 090715 (trigger=357498). The BAT on-board calculated location is RA, Dec 152.122, +9.997 which is RA(J2000) = 10h 08m 29s Dec(J2000) = +09d 59' 51" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 0.4 sec. The peak count rate was ~11,000 counts/sec (15-350 keV), at ~0.3 sec after the trigger. Due to current problems with the Solid State Recorder (GCN 9664), automatic slewing to sources is disabled. However, this burst location is also in Sun constraint and will not come out of constraint until October 9, 2009. There will thus be no XRT or UVOT data for this trigger. We note the existence of an S0/A galaxy NGC 3130 (z=0.027) near the edge of the BAT error circle (nominal position of the galaxy is 4.33 arcminutes from the center of the error circle, with NED reporting a radius of 1.0 arcmin for the galaxy). Burst Advocate for this burst is J. L. Racusin (racusin AT astro.psu.edu). 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.)