GCN Circular 7458
Subject
GRB 080319D: Swift/UVOT Refined Analysis of the Fading Optical Afterglow Candidate
Date
2008-03-19T19:54:49Z (16 years ago)
From
Stefan Immler at NASA/GSFC <stefan.m.immler@nasa.gov>
S. Immler (CRESST/GSFC/UMD) and P. J. Brown (PSU) report on behalf
of the Swift UVOT team:
The Swift/UVOT observations of the field of GRB 080319D (trigger 306793)
starting 151 seconds after the BAT trigger (Brown, et al., GCN Circ. 7453)
reveal a fading optical afterglow candidate. The white and v-filter
magnitudes
are as follows:
Filter T_start (s) T_stop (s) Exp (s) Mag (3-sigma UL)
----------------------------------------------------------------------------------------------
White 151 251 100 19.7+/-0.3
White 866 966 100 20.2+/-0.4
v 257 657 400 >19.5
v 972 1362 400 >19.5
----------------------------------------------------------------------------------------------
No correction has been made for the expected Galactic extinction
corresponding
to E(B-V) of 0.19 (Schlegel, et al. 1998). The position of the optical
afterglow
candidate is
RA (2000) = 06h 37m 53.6s
Dec (2000) = +23d 56' 34.2"
with an uncertainty of 0.5 arcsec, which is 2.2 arcsec offset from the XRT
position (Brown, et al., GCN Circ. 7453).