[vsnet-grb-info 6777] Detection of flare star Algol in Swift-BAT slew data
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Oct 15 03:47:52 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 8375
SUBJECT: Detection of flare star Algol in Swift-BAT slew data
DATE: 08/10/14 18:47:45 GMT
FROM: Antonio Copete at Harvard U <acopete at head.cfa.harvard.edu>
A. Copete, J. Grindlay (Harvard), S. Barthelmy (GSFC)
We report on an independent detection of the flare star Algol from
Swift-BAT slew data that precedes the BAT detection reported by L.
Vetere et al (GCN 8371). On the slew that began on 10/13/08 at
21:16:47 UT and lasted 129sec, ending 4sec before the trigger in
spacefraft pointing mode, Algol had an exposure time of 80.60sec and
is detected as a high-significance source in both the 15-50keV and
15-150keV energy bands (12.6 and 10.7 sigma, respectively). The
calculated location is:
RA(J2000) = 03h 08m 11s
Dec(J2000) = +40d 59' 42"
with an uncertainty of 3.0arcmin (90% radius). The derived 15-50keV
band flux is 343 mCrab. Prior to this detection, Algol fell within the
BAT slew survey field-of-view in the slews that began at 20:54:02 UT
and lasted 158sec, and at 19:57:02 UT and lasted 109sec, but in
neither case was it detected at a significance greater than 3.5sigma.
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