TITLE: GCN CIRCULAR NUMBER: 7512 SUBJECT: GRB 080325: Swift detection of a burst DATE: 08/03/25 04:25:22 GMT FROM: David Palmer at LANL L. Vetere (PSU), P. J. Brown (PSU), D. Grupe (PSU), C. B. Markwardt (CRESST/GSFC/UMD), C. Pagani (PSU), D. M. Palmer (LANL), J. L. Racusin (PSU), M. C. Stroh (PSU) and T. N. Ukwatta (GSFC/GWU) report on behalf of the Swift Team: At 04:09:17 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 080325 (trigger=307604). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 277.895, +36.511 which is RA(J2000) = 18h 31m 35s Dec(J2000) = +36d 30' 38" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). Because this is a 64-sec long image trigger, the TDRSS lightcurve does not show any significant signal (as is typical). The XRT began observing the field at 04:11:49.2 UT, 151.9 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 277.8920, +36.5221 which is equivalent to: RA(J2000) = 18h 31m 34.0s Dec(J2000) = +36d 31' 19.5" with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 40 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to assess possible redshift constraints using X-ray spectroscopy and the nH-z relation from Grupe et al. (2007). UVOT took a finding chart exposure of 100 seconds with the White (160-650 nm) filter starting 162 seconds after the BAT trigger. No afterglow candidate has been found in the initial data products. Image catalog data are not available at this time. 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 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.06. Burst Advocate for this burst is L. Vetere (vetere 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.)