G. Sato (GSFC/ISAS), S. Campana (INAF-OAB), P. A. Evans (U Leicester),
C. Guidorzi (Univ Bicocca&INAF-OAB), C. B. Markwardt (GSFC/UMD),
P. T. O'Brien (U Leicester), J. P. Osborne (U Leicester),
K. L. Page (U Leicester), D. M. Palmer (LANL),
R. L. C. Starling (U Leicester) and H. Ziaeepour (UCL-MSSL) report on
behalf of the Swift Team:
At 08:31:08 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 070427 (trigger=277356). This burst was too close to
the Sun (42 degrees) for Swift to slew to it.
The BAT on-board calculated location is
RA, Dec 28.862, -27.633 which is
RA(J2000) = 01h 55m 27s
Dec(J2000) = -27d 37' 57"
with an uncertainty of 3 arcmin (radius, 90% containment, including
systematic uncertainty). The BAT light curve showed a multiple-peaked
structure with a duration of about 15 sec. The peak count rate
was ~3500 counts/sec (15-350 keV), at ~5 sec after the trigger.
The GRB will become observable by the XRT and UVOT on May 5.