GCN Circular 7660
Subject
GRB080430: Swift/UVOT observations
Date
2008-05-01T21:49:40Z (16 years ago)
From
Wayne Landsman at GSFC/SSAI <wayne.b.landsman@nasa.gov>
W.B. Landsman (NASA/GSFC) and C. Guidorzi (INAF-OAB) report on behalf
of the Swift/UVOT team
The Swift/UVOT observed the field of GRB 080430 starting at 58s after
the BAT trigger (Guidorzi et al., GCN 7647). We detect the afterglow in
all seven UVOT filters at the position
RA(J2000.0) = 11:01:14.66
DEC(J2000.0) = +51:41:08.4
with an estimated uncertainty of 0.5 arcsec (radius, 90% confidence).
This position is consistent with the enhanced XRT position (Guidorzi et
al. GCN 7653)
and the position reported from BOOTES obervations by Jelinek et al.
(GCN 7648). The detection in the UVW2 (1950 A) filter is consistent
with the
redshift of ~0.76 determined from spectroscopic observations by Deugarte
Postigo et al. (GCN 7650) and Cucchiara & Fox (GCN 7654). The temporal
slope in the white filter out to 30400 seconds is approximately alpha =
0.23.
UVOT photometry from early individual images is reported below.
Filter Tmid(s) Expo(s) Magnitude
-----------------------------------------------------
White 108 98 17.08 � 0.03
White 928 98 18.23 � 0.05
v 364 393 17.64 � 0.06
v 1184 393 18.50 � 0.09
b 5989 197 20.05 � 0.21
u 5784 197 18.92 � 0.12
w1 7014 197 18.89 � 0.16
m2 6809 197 18.88 � 0.22
w2 5684 197 19.24 � 0.20
-----------------------------------------------------
These magnitudes are not corrected for the Galactic extinction
corresponding to a reddening of E{B-V} = 0.012 mag (Schlegel et al.
1998). The photometry is on the UVOT flight system described in Poole
et al. (2008,MNRAS,383,627).