GCN Circular 4717
Subject
GRB 060209(?): Swift-BAT detection of a possible burst
Date
2006-02-09T19:44:31Z (19 years ago)
From
Scott Barthelmy at NASA/GSFC <Scott@lheamail.gsfc.nasa.gov>
J. Osborne (U Leicester), S. Barthelmy (GSFC), N. Gehrels (GSFC),
J. Kennea (PSU), H. Krimm (GSFC/USRA), C. Markwardt (GSFC/UMD),
F. Marshall (GSFC), K. Page (U Leicester), D. Palmer (LANL),
T. Sakamoto (GSFC/ORAU), P. Schady (PSU/UCL-MSSL)
on behalf of the Swift team:
At 19:08:55 UT, Swift-BAT triggered and located GRB 060209 (trigger=180931).
The spacecraft slewed immediately. The BAT on-board calculated location is
RA,Dec 65.454,+58.730d {04h 21m 49s,+58d 43' 47"} (J2000), with an uncertainty
of 3 arcmin (radius, 90% containment, stat+sys). The TDRSS lightcurve
does not show anything significant (in T-20 to T+128 sec) which is consistant
with a weak short burst and with a cosmic ray shower. We will not be able
to distinguish these until we get the full data in about an hour.
The XRT began taking data at 19:10:00 UT, 64 seconds after the BAT
trigger. The XRT on-board centroid algorithm did not find a source in the
image and no prompt position is available. We are waiting for down-linked
data to detect and determine a position for the source.
UVOT took a finding chart exposure of 200 seconds with the V filter
starting 65 seconds after the BAT trigger. No afterglow candidate
has been found in the initial data products. The 2.7'x2.7' sub-image
covers 25% of the BAT error circle. The typical 3-sigma upper limit
has been about 18th mag. The 8'x8' region for the list of sources
generated on-board covers 100% of the BAT error circle. The list
of sources is typically complete to about 18.0 mag. No correction
has been made for the expected extinction of about 2.9 magnitudes.