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GCN Circular 7112

Subject
Swift/UVOT upper limits for GRB 071117
Date
2007-11-19T13:08:48Z (17 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).
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