GRB 080725

H. A. Krimm (CRESST/GSFC/USRA), W. H. Baumgartner (GSFC/UMBC),
A. P. Beardmore (U Leicester), P. A. Evans (U Leicester),
S. D. Hunsberger (PSU), S. Immler (CRESST/GSFC/UMD),
J. Mao (INAF-OAB), P. T. O'Brien (U Leicester),
K. L. Page (U Leicester), D. M. Palmer (LANL),
D. Perez (U Leicester), B. Preger (ASDC),
R. L. C. Starling (U Leicester), G. Stratta (ASDC) and
L. Vetere (PSU) report on behalf of the Swift Team:

At 10:26:14 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 080725 (trigger=317888).  The BAT on-board calculated location is 
RA, Dec 121.715, -13.990 which is 
   RA(J2000) = 08h 06m 52s
   Dec(J2000) = -13d 59' 23"
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 60 sec.  The peak count rate
was ~2800 counts/sec (15-350 keV), at ~3 sec after the trigger. 

Due to proximity to the Sun, Swift cannot slew to the BAT position. 
The source will not be observable until September. There will thus 
be no XRT or UVOT data for this trigger. 

Burst Advocate for this burst is H. A. Krimm (krimm AT milkyway.gsfc.nasa.gov). 
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.)

P. D'Avanzo, D. Fugazza, L.A. Antonelli, L.  Calzoletti,  S. Campana, 
G.  Chincarini, S. Covino, M.L. Conciatore, S. Cutini, V. D'Elia,  F. 
D'Alessio, F.  Fiore, P. Goldoni, D. Guetta,  C. Guidorzi, G.L. Israel, 
E. Maiorano, N. Masetti, A. Melandri, E. Meurs, L. Nicastro, E. Palazzi, 
E. Pian, S. Piranomonte, L.  Stella, G.  Stratta, G. Tagliaferri, G. 
Tosti, V.Testa, S.D. Vergani, F. Vitali report on behalf of the REM team:

The robotic 60-cm REM telescope located at La Silla (Chile) observed 
automatically the field of the GRB 080725 (Krimm et al. GCN 8014
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 ) on 
July 25 starting at 10:34:23 UT (about 8 minutes after the burst, 23 
second after the trigger). Observations were carried out during twilight 
and at high airmass. We do not identify any obvious afterglow candidate 
down to R > 16.1 and H > 14.5 (3sigma c.l.) inside the BAT error box.

T. Ukwatta (GWU), S. D. Barthelmy (GSFC), W. Baumgartner (GSFC/UMBC),
J. Cummings (GSFC/UMBC), E. Fenimore (LANL), N. Gehrels (GSFC),
H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD), K. McLean (GSFC/UMD),
D. Palmer (LANL), A. Parsons (GSFC), T. Sakamoto (GSFC/UMBC),
G. Sato (ISAS), M. Stamatikos (GSFC/ORAU), J. Tueller (GSFC),
(i.e. the Swift-BAT team):

Using the data set from T-240 to T+130 sec from the recent telemetry 
downlink, we report further analysis of BAT GRB 080725 (trigger #317888)
(Krimm, et al., GCN Circ. 8014
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 ).  The BAT ground-calculated position is
RA, Dec = 121.699, -13.984 deg which is
   RA(J2000)  =  08h 06m 47.7s
   Dec(J2000) = -13d 59' 03.4"
with an uncertainty of 1.3 arcmin, (radius, sys+stat, 90% containment).
The partial coding was 42%.

The mask-weighted light curve starts with a short, faint precursor from
T-105 to T-100 sec.  The main emission peak begins at T-20 sec and rises 
to a peak at T+2 sec.  There is a second peak at T+13 sec, and the 
emission falls to background levels by T+25 sec. T90 (15-350 keV) is 120 
(+5, -75) sec (estimated error including systematics).  The spacecraft 
slewed away from the burst location starting at T+100 sec, so there is 
no data beyond T+130 sec.

The time-averaged spectrum from T-105.5 to T+51.8 sec is best fit by a 
simple power-law model.  The power law index of the time-averaged 
spectrum is 1.50 +- 0.10.  The fluence in the 15-150 keV band is 3.7 +- 
0.2 x 10-6 erg/cm2. The 1-sec peak photon flux measured from T+3.54 sec 
in the 15-150 keV band is 2.3 +- 0.3 ph/cm2/sec.  All the quoted errors 
are at the 90% confidence level.

The results of the batgrbproduct analysis are available at
http://gcn.gsfc.nasa.gov/notices_s/317888/BA/