[vsnet-grb-info 4406] GRB070309: Swift/XRT possible afterglow detection

GCN Circulars gcncirc at capella.gsfc.nasa.gov
Sat Mar 10 09:15:21 JST 2007


TITLE:   GCN CIRCULAR
NUMBER:  6187
SUBJECT: GRB070309: Swift/XRT possible afterglow detection 
DATE:    07/03/10 00:14:35 GMT
FROM:    Pat Romano at OAB-Swift  <patrizia.romano at brera.inaf.it>

S.D. Vergani (Dunsink observatory-DIAS, DCU),
P. Romano (INAF-OAB, Univ. Bicocca),
C. Guidorzi (INAF-OAB, Univ. Bicocca) report on behalf
of the Swift-XRT team:

We have analyzed the Swift XRT data from the first 11ks observations
of INTEGRAL GRB 070309 (Paizis, et al. 2007, GCN Circ. 6182).
Inside the INTEGRAL error circle we find one source at the position

RA(J2000) = 17h 34m 39.1s
Dec(J2000) = -37d 55' 48.2"

with an estimated error radius of ~5 arcsec (90% confidence).
This is 81 arcseconds from the INTEGRAL position.
The source has a count rate of (2.0+-0.6)E-3 counts/s and, assuming
a crab spectrum, a flux of 5E-14 erg/cm2/s. We collected a total of
15 counts. More data are being collected that will be used to determine
whether the source is fading and to perform a spectral analysis.

This Circular is an official product of the Swift XRT Team.



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