[AAVSO-HEN] GRB 080802: Swift/UVOT Upper Limits

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  8055
SUBJECT: GRB 080802: Swift/UVOT Upper Limits
DATE:    08/08/03 05:56:21 GMT
FROM:    Patricia Schady at MSSL/Swift  <ps at mssl.ucl.ac.uk>

P. Schady (MSSL-UCL) and W.H. Baumgartner (GSFC/UMBC) report on behalf of 
the Swift/UVOT team:

The Swift/UVOT observed the field of GRB 080802 starting 87 s after the 
BAT trigger (Baumgartner et al., GCN Circ. 8051).  We do not find a source 
in any of the UVOT observations inside the XRT error circle (Baumgartner 
et al., GCN Circ. 8051). The 3-sigma upper limits for detecting a source 
in the first white and v finding charts (FC) exposure and co-added frames 
are:

Filter          T_start T_stop  Exp     Mag (3-sigma UL)
                 (s)     (s)     (s)
=========================================================
white (FC)      87      186     100     > 20.0
white           4803    5002    200     > 20.4
v (FC)          193     406     213     > 18.7
v               5214    5413    200     > 18.7
b               4598    6189    356     > 20.1
u               4393    6028    400     > 19.9
uvw1            4188    5822    400     > 19.8
uvm2            3983    5618    400     > 19.7
uvw2            5009    5208    200     > 19.5

The values quoted above are not corrected for the expected Galactic 
extinction corresponding to a reddening of E(B-V) = 0.80 mag in the 
direction of the burst (Schlegel et al. 1998).