GCN Circular 7642
Subject
GRB080426: Swift/UVOT upper limits
Event
Date
2008-04-26T20:37:54Z (18 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S.R. Oates (UCL-MSSL) and H. Ziaeepour (UCL-MSSL) report on behalf of
the Swift/UVOT team.
The Swift/UVOT began settled observations the field of GRB 080426
(trigger 310219) 226 seconds after the BAT trigger (Ziaeepour, et al.,
GCN Circ. 7639). No afterglow is detected at the enhanced XRT position
(Beardmore, et al., GCN Circ. 7641) in any of the UVOT filters. The 3
sigma upper limits are given below:
Filter T_start T_stop Exp. Mag UL (3sig)
(s) (s)
------------------------------------------------
white 226 326 98 >20.38
white 446 7457 362 >20.86
v 333 7868 1316 >19.98
b 431 7253 303 >20.01
u 407 7047 333 >19.79
uvw1 382 6843 352 >19.99
uvm2 357 7969 407 >19.94
uvw2 462 7663 510 >20.26
-------------------------------------------------
These upper limits are not corrected for the Galactic extinction in
the line of sight, corresponding to a reddening of E(B-V)= 0.798 mag
(Schlegel et al., 1998, ApJS, 500, 525). The photometry is based on
the UVOT photometric system described in Poole et al. (2008, MNRAS, 383,
627).