GCN Circular 4917
Subject
GRB 060323: Swift/UVOT Observations
Date
2006-03-24T20:56:10Z (18 years ago)
From
Frank Marshall at GSFC <marshall@milkyway.gsfc.nasa.gov>
F. Marshall (GSFC/NASA) and L. Vetere (ASDC) on behalf of the Swift/UVOT team
The Swift/UVOT began taking data on the field of GRB 060323 at 14:37:30 UT on
2006-03-23, approximately 294s after the BAT trigger (Vetere et al., GCN 4904).
There are marginal detections at the position of the optical afterglow
(Covino et al. GCN 4911; Jensen et al. GCN 4915; Covino et al. GCN 4916)
in the White, V, and B filters. The table below provides the results
for the initial finding chart exposure using the White filter and for
summed exposures.
The UVOT on-board detection of a weak source suggested as a possible afterglow
by Vetere et al. is not confirmed in ground analysis of the complete
finding chart image.
Filter T_range(s) Exp(s) 3-sigma UL Possible Detection
Mag sigma
White 294-393 100 20.0 21.1 1.8
White 486-17446 2171 21.9
V 525-22318 2012 20.6 21.6 2.1
B 473-16535 1308 21.3 22.1 2.6
U 449-6313 453 21.2
UVW1 425-23955 1163 21.3
These magnitudes are uncorrected for the expected Galactic extinction corresponding
to E(B-V) = 0.015.