GCN Circular 8386
Subject
GRB 081016B: Swift/UVOT Upper Limits
Date
2008-10-17T15:47:39Z (16 years ago)
From
Wayne Landsman at GSFC/SSAI <wayne.b.landsman@nasa.gov>
W.Landsman (GSFC) and K. L. Page (U Leicester), on behalf of the
Swift/UVOT team.
The Swift Ultra-Violet/Optical Telescope (UVOT) began settled
observations of GRB 081016B (trigger 331856) 93 seconds after the BAT
trigger (Page et al.,GCN Circ. 8381). No afterglow is detected at the
enhanced XRT position (Osborne et al., GCN Circ. 8383) in the initial
white finding chart or subsequent images. The limiting magnitudes
(3-sigma in 3" radius
apertures) in each of the UVOT filters are as follows:
Filter T_start(s) T_stop(s) Exp(s) Mag UL (3sig)
white 93 243 150 >21.5
b 4710 4823 113 >20.6
v 5373 5572 197 >20.0
u 5988 11724 960 >21.5
uvw1 5783 5982 197 >20.3
uvm2 5577 5777 197 >20.0
uvw2 5168 5368 197 >20.3
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)=0.01 mag in
the direction of the burst (Schlegel et al. 1998).