[vsnet-grb-info 2938] GRB 060218: Swift-BAT detection of a possible burst

[GCN Circulars]

TITLE:   GCN GRB OBSERVATION REPORT
NUMBER:  4775
SUBJECT: GRB 060218: Swift-BAT detection of a possible burst
DATE:    06/02/18 04:28:55 GMT
FROM:    Scott Barthelmy at NASA/GSFC  <Scott at lheamail.gsfc.nasa.gov>

G. Cusumano (IASF-Pa INAF), S. Barthelmy (GSFC), N. Gehrels (GSFC),
S. Hunsberger (PSU), S. Immler (GSFC), F. Marshall (GSFC),
D. Palmer (LANL), T. Sakamoto (GSFC/ORAU)
on behalf of the Swift team:

At 03:34:30 UT, the Swift Burst Alert Telescope (BAT) triggered and
located GRB 060218 (trigger=191157).  Swift slewed immediately to the burst.
The BAT on-board calculated location is RA,Dec 50.404, +16.866 deg
{03h 21m 37s, +16d 51' 58"} (J2000) with an uncertainty of 3 arcmin
(radius, 90% containment, including systematic uncertainty).  The TDRSS
lightcurve shows nothing, which is consistent and common for an image trigger.

The XRT began taking data at 03:37:04 UT, 153 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.

The UVOT began taking data 152 seconds after the BAT trigger.
There is an indication of an afterglow candidate at RA,Dec
03h 21m 39.8s,+16d 52' 06" +/- 1 arcsec with an estimated B magnitude of 19.4.