GCN Circular 7112
Subject
Swift/UVOT upper limits for GRB 071117
Event
Date
2007-11-19T13:08:48Z (18 years ago)
From
Samantha Oates at MSSL <sro@mssl.ucl.ac.uk>
S. R. Oates (MSSL-UCL) and T. N. Ukwatta (GSFC/GWU) report on behalf of
the Swift/UVOT team:
The Swift/UVOT observed the field of GRB 071117 (Ukwatta et al., GCN 7098)
48 minutes after the BAT trigger, once the Earth had come out of observing
constraint. No new source is found in any of the UVOT observations in
either single or co-added exposures at the position of s2 reported by
Bloom et al. (GCN 7110) or within the XRT error circle (Guidorzi et al.,
GCN 7103).
The following 3-sigma upper limits were determined at the position
of the Gemini detection (RA=22:20:10.42, DEC=-63:26:35.5, J2000 ):
Filter Tstart Tend Exp Magnitude
(s) (s) (s) (3-sigma UL)
-------------------------------------------------
v 2960 44497 1608 >21.2
white 2852 62512 1812 >22.9
b 3779 61600 3125 >22.5
u 3574 56599 3075 >22.2
uvw1 3369 55834 4154 >22.4
uvm2 3164 32613 2368 >21.8
uvw2 4190 62783 2227 >22.1
-------------------------------------------------
The values quoted above are not corrected for the expected Galactic
extinction corresponding to a reddening of E(B-V) =
0.024 mag in the direction of the GRB (Schlegel et al. 1998).