[vsnet-grb-info 21482] GRB 181228A: Swift/UVOT Upper Limits
GCN Circulars
gcncirc at capella2.gsfc.nasa.gov
Sat Dec 29 01:55:38 JST 2018
TITLE: GCN CIRCULAR
NUMBER: 23581
SUBJECT: GRB 181228A: Swift/UVOT Upper Limits
DATE: 18/12/28 16:53:43 GMT
FROM: Sam LaPorte at PSU <sjl5346 at psu.edu>
GRB 181228A: Swift/UVOT Upper Limits
S. J. LaPorte (PSU) and M. J. Moss (George Washington University)
report on behalf of the Swift/UVOT team:
The Swift/UVOT began settled observations of the field of GRB 181228A
93 s after the BAT trigger (Moss et al., GCN Circ. 23570).
No optical afterglow consistent with the XRT position
(Moss et al. GCN Circ. 23570)
is detected in the initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first
finding chart (FC) exposure and subsequent exposures are:
Filter T_start(s) T_stop(s) Exp(s) Mag
white_FC 93 243 147 >20.4
u_FC 305 555 246 >20.6
white 93 1354 373 >21.0
v 634 1404 97 >19.1
b 561 1330 78 >20.5
u 305 1305 304 >20.5
w1 684 1280 39 >18.4
The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.51 in the direction of the burst
(Schlegel et al. 1998).
More information about the vsnet-grb-info
mailing list