GCN Circular 8874
Subject
GRB090201: Swift UVOT upper limits
Date
2009-02-02T11:05:00Z (15 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL-UCL) and S. Oates (MSSL-UCL) report on behalf of the
Swift UVOT team
The Swift/UVOT began settled observations of the field of GRB 090201
3668s after the BAT trigger (Oates et al., GCN 8865). We do not detect
any source at the enhanced Swift XRT position (Beardmore et al. GCN
8872) or at the VLT optical and NIR afterglow candidate (D'Avanzo et
al. GCN 8873) down to the following 3-sigma upper limits:
Filter T_start(s) T_stop(s) Exp(s) Mag (3-sigma upper limit)
-------------------------------------------------------------
White 3668 5051 344 > 21.53
v 3825 10589 1159 > 20.63
b 4646 16906 834 > 21.38
u 4440 16245 1082 > 21.15
uvw1 4235 14730 448 > 20.16
uvm2 4030 11123 717 > 20.53
uvw2 5056 5256 197 > 20.03
The quoted upper limits have not been corrected for the expected
Galactic extinction along the line of sight of E_(B-V) = 0.07 mag. All
photometry is on the UVOT photometric system described in Poole et al.
(2008, MNRAS, 383, 627).