GCN Circular 6730
Subject
GRB 070808: Swift/UVOT upper limits
Date
2007-08-09T22:21:31Z (18 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F.E. Marshall (NASA/GSFC) and J.R. Cummings (NASA/UMBC)
report on behalf of the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 070808 starting 119 s after
the BAT trigger (Cummings et al., GCN Circ. 6718). We do not find a source
in any of the UVOT observations inside the refined XRT error circle
(Starling and Cummings, GCN Circ. 6725). The 3-sigma upper limits for detecting
a source in the first finding chart (FC) exposure and co-added frames are:
Filter T_start(s) T_stop(s) Exp(s) Mag (3-sigma UL)
white (FC) 119 218 98 >20.6
white 119 7539 628 >20.9
v 225 6515 1051 >20.4
b 704 7334 461 >20.5
u 680 7129 490 >20.6
uvw1 655 6925 490 >20.3
uvm2 783 6720 452 >20.9
uvw2 734 7625 353 >20.8
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E(B-V) = 0.02 mag in
the direction of the burst (Schlegel et al. 1998).