[vsnet-grb-info 8201] GRB 090727: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella.gsfc.nasa.gov
Wed Jul 29 11:01:04 JST 2009
TITLE: GCN CIRCULAR
NUMBER: 9731
SUBJECT: GRB 090727: Swift/UVOT Upper Limits
DATE: 09/07/29 02:00:58 GMT
FROM: Margaret Chester at PSU <chester at astro.psu.edu>
M.M. Chester (PSU) and P. A. Evans (U Leicester) report on behalf of the
Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 090727
92 s after the BAT trigger (Evans et al., GCN Circ. 9718). We do not find
any new source at the position of the XRT afterglow (Goad et al., GCN Circ.
9721). Preliminary 3-sigma upper limits for the white finding chart and the
co-added images, using the UVOT photometric system (Poole et al. 2008,
MNRAS, 383, 627), are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 92 241 147 >20.6
white 92 5987 541 >21.5
v 4760 57429 3737 >21.1
b 4145 46543 1752 >21.3
u 3939 52323 4261 >21.8
w1 5171 51651 4625 >22.1
m2 4965 57845 4989 >22.3
w2 4556 56519 3825 >21.7
The values quoted above are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.54 in the direction of the burst
(Schlegel et al. 1998).
More information about the vsnet-grb-info
mailing list