GCN Circular 4411
Subject
GRB 051227: Swift/UVOT Upper Limits (Possible U-band
Date
2005-12-28T19:40:53Z (18 years ago)
From
Pete Roming at PSU <roming@astro.psu.edu>
P. Roming (PSU), L. Barbier (GSFC), M. Trippico (GSFC-SSAI), J. Nousek
(PSU) on behalf of the Swift/UVOT team
We have created summed images from Swift UVOT exposures of GRB051227
(Barbier et al., GCN 4397) taken through each of the broadband filters. No
source was detected at the XRT position (Beardmore et al. GCN 4402) or the
R-band VLT position (Malesani, GCN 4404) down to the
following 5-sigma upper limits (no correction has been made for the
expected visual extinction of about 0.14 magnitudes):
Filter T_range(s) Tot Exp(s) 5sigUL(mag)
V 96-4092 496 19.0
B 462-10250 617 20.2
U 408-6370 502 19.6
UVW1 354-5904 950 19.6
UVM2 300-4996 950 19.7
UVW2 571-3988 113 18.5
White 516-565 100 19.2
We note that from the U-band summed image a source is detected by the Swift
analysis tool, uvotsource, at the 4.0-sigma confidence coincident with the
position reported by Malesani. The magnitude is 19.8+/-0.3.