GCN Circular 33003

Subject

GCN: GRB 221201A: Swift/UVOT Upper Limits

Event

Date

2022-12-02T13:27:29Z (4 years ago)

From

Samantha Oates at MSSL <samantha.oates@alumni.ucl.ac.uk>

S. R. Oates (U.Birmingham) and E. Troja (NASA/GSFC/UMCP)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 221201A
179 s after the BAT trigger (Troja et al., GCN Circ. 32998Loading...
 
 ).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 33001Loading...
 
 )
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           179          329          147         >20.1
white              179         1970          225         >20.2
v                 1479         2020           78         >17.8
b                 1404         2107           85         >18.8
u                  337         2094          277         >19.2
w1                1529         2069           78         >18.4
m2                1504         2045           78         >18.5
w2                1454         1996           78         >18.6

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.066 in the direction of the burst
(Schlegel et al. 1998).