GCN Circular 9471
Subject
Corrections to GRB 090531B Swift/UVOT Upper Limits
Event
Date
2009-06-01T14:29:44Z (17 years ago)
From
Patricia Schady at MSSL/Swift <ps@mssl.ucl.ac.uk>
P. Schady (MSSL-UCL) and J. R. Cummings (NASA/UMBC) report on behalf of
the Swift/UVOT team:
We report a mistake in a few of the times provided in GCN 9469, including
the start time of the observations, which was in fact 3849 s after the BAT
trigger (Cummings et al., GCN Circ. 9461). Also, the exposure times of the
UVOT observations should have been two times the values given.
The corrected 3-sigma upper limits for the UVOT observations of the field
of GRB 090531B are provided below.
Filter T_mid(s) Exp(s) 3-sig Mag UL
white 3924 147 > 20.52
v 4105 197 > 19.08
b 4926 197 > 20.06
u 4721 197 > 19.74
uvw1 4515 197 > 19.65
uvm2 4310 197 > 19.32
uvw2 5336 197 > 19.61
The values quoted above are not corrected for the large Galactic
extinction due to the reddening of E(B-V)=1.12 in the direction of the
burst (Schlegel et al. 1998). The photometry is on the UVOT photometric
system described in Poole et al. (2008, MNRAS, 383, 627).