[vsnet-grb-info 26867] GRB 201128A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28970
SUBJECT: GRB 201128A: Swift/UVOT Upper Limits
DATE:    20/11/30 23:24:56 GMT
FROM:    Alexander Belles at PSU/Swift  <aub1461 at psu.edu>

GRB 201128A: Swift/UVOT Upper Limits

A. Belles (PSU) and A. Y. Lien (GSFC/UMBC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 201128A
130 s after the BAT trigger (Lien et al., GCN Circ. 28958).
No optical afterglow consistent with the XRT position
(Lien et al. GCN Circ. 28958)
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) exposures and subsequent exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white_FC           130          280          147         >20.0
u_FC               289          538          246         >19.3
white              130          761          186         >20.0
v                  619          639           19         >17.4
b                  544          737           39         >18.6
u                  289          538          246         >19.3
w1                 668          688           19         >18.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).