[vsnet-grb-info 8774] GRB091208A: Swift/UVOT refined analysis
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Dec 9 22:43:33 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 10274
SUBJECT: GRB091208A: Swift/UVOT refined analysis
DATE: 09/12/09 13:43:27 GMT
FROM: Massimiliano de Pasquale at MSSL-UCL <mdp at mssl.ucl.ac.uk>
M. De Pasquale (MSSL/UCL) and E. Hoversten (PSU) report on the behalf of
the Swift team:
Swift/UVOT observed the field of GRB091208A from 4.32 ks to 4.33 ks after
the BAT trigger in the v filter and then from 26.01 to 26.71 ks after the
trigger in u, v and white filters. No new source is detected in the BAT
error circle (Barthelmy et al., GCN Circ. 10264). We caution though that
a small fraction of BAT error circle is not covered by UVOT exposures.
3 sigma upper limits on magnitudes are as follows:
Filter T_start(s) T_stop(s) Exp(s) Mag
v 4318 4328 10 >17.4
v 26513 26717 200 >19.4
wh 26261 26507 243 >21.1
u 26008 26255 243 >20.1
The values quoted above are on the UVOT Photometric System
(Poole et al., 2008, MNRAS 383,627). They are not corrected for
the expected strong Galactic extinction, corresponding to a reddening
of E(B-V)=1.6.
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