GCN Circular 7307
Subject
Swift/UVOT refined analysis of GRB080212
Event
Date
2008-02-13T13:55:09Z (18 years ago)
From
Massimiliano de Pasquale at MSSL-UCL <mdp@mssl.ucl.ac.uk>
M. De Pasquale and H. Ziaeepour (MSSL/UCL)
report on behalf of the Swift team:
The Swift/UVOT observed the field of GRB 080212 (trigger 303105)
starting 110 seconds after the BAT trigger (Ziaeepour et al
GCN Circ. 7296), which occurred at 17:34:33 UT.
A source is detected in the enhanced XRT error circle reported
by Evans et al (GCN circ. 7300), blended with the K-type star
mentioned in GCN 7304 by Berger et al.
The detection is only in the early V band exposures. There was
no other 3-sigma detection of the afterglow in any exposure
in any of the UVOT filters.
We do caution that photometry for this burst has been
carried out in very difficult conditions. Furthermore, no
correction has been made for the non-negligible Galactic
extinction towards the burtst, which amounts to E(B-V) = 0.16
The detections and 3-sigma upper limits in the UVOT photometric
system (Poole et al MNRAS 383, 627 (2008)) are summarized in
the following table:
Filter Tstart(s) Tstop(s) Exp(s) Mag / Upper limit
V 110 510 393 17.8 +/- 0.1
V 4734 6166 393 19.3 +/- 0.3
V 21968 22876 893 >20.3
B 4323 4522 393 >20.7
B 11320 40999 1774 >21.2
U 4119 5548 393 >20.3
U 10408 40703 3400 >21.5
UW1 3919 5344 393 >20.0
UW1 9502 50920 4309 >21.2
UM2 3741 6300 323 >19.3
UM2 15290 45066 3413 >20.6
UW2 4529 5961 393 >19.4
UW2 21062 21961 893 >20.7