GCN Circular 8819
Subject
GRB090117 Swift/UVOT upper limits
Date
2009-01-18T03:23:36Z (15 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL-UCL) reports on behalf of the Swift/UVOT team:
The Swift/UVOT began observing the field of SuperAGILE GRB 090117
(Donnarumma et al., GCN 8817) at 2009-01-017 19:10:14 UT, 13.7 ks
after the burst. We do not detect any source at the Swift XRT position
(Beardmore et al., GCN 8818), although we note that there is a bright
star with v-band magnitude v = 17.7 that lies within the XRT error
circle.
The UVOT 3-sigma upper limits are reported below:
Filter T_start Exp(s) Mag (3-sigma upper limit)
-------------------------------------------------------------
white 14.4 455 > 17.18
v 15.1 595 > 16.18
b 13.8 627 > 17.08
u 13.7 63 > 17.27
-------------------------------------------------------------
The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 1.63 mag. All
photometry is on the UVOT photometric system described in Poole et al.
(2008, MNRAS, 383, 627).