GCN Circular 7579
Subject
Swift/UVOT observations of GRB080409
Event
Date
2008-04-09T13:01:18Z (19 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
Swift/UVOT began settled observations of the field of GRB 080409 starting
88s after the BAT trigger (Holland et al., GCN Circ 7573). We do not
detect an optical/uv afterglow at the enhanced XRT position (Evans et al.,
GCN Circ. 7575) in the initial finding chart observations or subsequent
summed images down to the following 3 sigma upper limits:
Filter T_start T_stop Exp. Mag UL (3sig)
(s) (s) (s)
white 88 187 93 > 20.22
white 682 7079 494 > 21.16
v 188 587 393 > 19.45
v 721 12243 1099 > 20.03
b 667 676 412 > 20.42
u 642 661 432 > 20.13
uvw1 618 637 430 > 19.86
uvm2 593 12940 1070 > 20.23
uvw2 697 11330 1082 > 20.46
The above magnitudes are not corrected for the large Galactic extinction
in the line of sight to GRB 080409, corresponding to a reddening of
E(B-V)=0.78 mag (Schlegel et al., 1998, ApJS, 500, 525). The photometry is
on the UVOT flight system described in Poole et al. (2008, MNRAS, 383,
627).