GCN Circular 7044
Subject
GRB 071104: Possible Swift UVOT Afterglow Candidate
Date
2007-11-05T05:56:30Z (17 years ago)
From
Stefan Immler at NASA/GSFC <immler@milkyway.gsfc.nasa.gov>
S. Immler (NASA/CRESST/GSFC) reports on behalf of the Swift
UVOT team:
Swift UVOT started observing the field of the SuperAGILE burst GRB
071104 (Donnarumma et al., GCN Circ. 7042), 20.6 ks after the AGILE
trigger. In the first 120-s and co-added 5037-s of data obtained in the
white
filter, a possible UVOT afterglow candidate is found consistent with the
XRT position (Page, GCN 7043), with a magnitude of 20.6+/-0.1 mag,
overlaying the coincidence-loss structure of a nearby bright star.
The value quoted above is not corrected for the expected Galactic
extinction corresponding to a reddening of E_{B-V} = 0.54 mag in the
direction of the burst (Schlegel et al. 1998).
Further analysis is required due to possible contamination with the
coincidence-loss structure of the nearby star and the high source
density of the field in the Galactic plane.