[vsnet-grb-info 7920] GRB 090831B: Swift-XRT candidate afterglow position
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Mon Jun 1 05:27:56 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9463
SUBJECT: GRB 090831B: Swift-XRT candidate afterglow position
DATE: 09/05/31 20:27:50 GMT
FROM: Boris Sbarufatti at INAF-IASF-Pa <sbarufatti at ifc.inaf.it>
B. Sbarufatti, V. Mangano (INAF-IASFPA) and
J. R. Cummings (NASA/UMBC) report on behalf of the
Swift-XRT team
The XRT began observing the field of GRB 090531B
(trigger 353728, Cummins, et al., GCN Circ 9461) at
19:26:22 UT, 3026 seconds after the BAT trigger, as
soon as the burst went outside the Earth limb observing
constraint.
Using promptly downlinked data we find an X-ray
source with an enhanced position: RA,Dec = 252.0748, -36.0350
(degrees) which is equivalent to:
RA (J2000.0) = 16 48 17.95
DEC (J2000.0) = -36 02 06.0
with an uncertainty of 3.4 arcsec (radius, 90% containment).
This location is 47.8 arcseconds from the BAT onboard position, inside
the BAT
error circle.
This circular is an official product of the Swift-XRT team.
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