GCN Circular 8406
Subject
Swift UVOT observations of GRB 081024
Date
2008-10-25T11:53:56Z (16 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
M. De Pasquale (MSSL/UCL) and G. Stratta (ASDC) report on behalf of
the Swift UVOT team.
The Swift UltraViolet/Optical Telescope (UVOT) began its finding chart
exposure of GRB081024 (Swift BAT trigger
number 332516, Stratta et al., GCN Circ. 8398), 77s after the trigger.
We do not detect any new source at the XRT position reported in GCN
Circ. 8403 (Beardmore et al.) either
in the finding chart nor in in successive coadded observations.
The magnitude 3 sigma upper limits for detecting GRB081024 at the XRT
position are given below.
Filter Tstart(s) Tstop(s) Exp(s) Magnitude
wh 77 227 147 >20.8
wh 516 13395 1258 >22.0
v 565 758 39 >18.5
v 1041 7298 490 >19.9
b 491 856 58 >19.6
b 1140 12771 1358 >21.4
u 235 485 250 >20.1
u 639 11859 807 >21.0
uvw1 615 7615 436 >20.2
uvm2 590 7503 529 >20.5
uvw2 541 7093 529 >20.6
The values quoted above are on the UVOT Photometric System (Poole et
al, 2008, MNRAS 383,627). They are not
corrected for the unknown but expected large Galactic extinction in
the direction of this burst.