GCN Circular 8478
Subject
GRB081104: Swift/UVOT Upper Limits
Date
2008-11-04T20:35:43Z (15 years ago)
From
Peter Brown at PSU <pbrown@astro.psu.edu>
P. J. Brown, C. A. Swenson (PSU), S. T. Holland, and A. M. Parsons (GSFC),
on behalf of the Swift/UVOT team.
The Swift Ultra-Violet/Optical Telescope (UVOT) began settled
observations of GRB 081104 (trigger 333666) 2638 seconds after the BAT
trigger (Parsons et al., GCN Circ. 8473). No afterglow is detected at the
XRT position (Mangano et al., GCN Circ. 8474) in any filter.
The limiting magnitudes (3-sigma in 5" radius apertures) in each
of the UVOT filters are as follows:
Filter T_start(s) T_stop(s) Exp(s) Mag UL (3sig)
white 2638 3882 209 >21.1
v 2794 9582 1082 >20.5
b 3614 3814 197 >20.4
u 3409 3609 197 >20.1
uvw1 3204 3404 197 >19.8
uvm2 2999 9874 479 >20.1
uvw2 2788 5368 197 >19.9
The values quoted above are in the UVOT photometric system (Poole et al.
2008, MNRAS, 383, 627). They are not corrected for the expected
Galactic extinction corresponding to a reddening of E(B-V)=0.11 mag in
the direction of the burst (Schlegel et al. 1998).