[vsnet-grb-info 6076] GRB 080319B: Further HST observations and
underlying host
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Tue May 13 03:35:42 JST 2008
TITLE: GCN CIRCULAR
NUMBER: 7710
SUBJECT: GRB 080319B: Further HST observations and underlying host
DATE: 08/05/12 18:35:30 GMT
FROM: Andrew Levan at U.of Leicester <anl at star.le.ac.uk>
A.J. Levan (U. Warwick), N.R. Tanvir (U. Leicester), A.S. Fruchter (STScI)
and J. Graham (STScI) report:
We have obtained a second epoch of HST observations of GRB 080319B on 11
May 2008. 2 orbits (3200s) of observations were taken in the F606W and
F814W filters. The afterglow has clearly faded from our first epoch of
observations and a faint host galaxy is now visible at the afterglow
location. We measure magnitudes for the combined (afterglow+host) source
of;
F606W(AB)=26.3 +/ -0.1
F814W(AB)=25.9 +/ -0.1
Relative astrometry between the two epochs of HST observations suggests
that the afterglow is marginally (0.1 +/- 0.05 arcseconds) offset from the
centroid of the host galaxy in the F606W image. This implies that the
afterglow may not be the dominant source of light at the current epoch,
and is likely significantly fainter than the magnitudes quoted above.
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