[vsnet-grb-info 25985] GRB 200711A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28085
SUBJECT: GRB 200711A: Swift/UVOT Upper Limits
DATE:    20/07/13 02:22:08 GMT
FROM:    Kira Simpson at PSU  <kira.simpson1984 at gmail.com>

GRB 200711A: Swift/UVOT Upper Limits

K. K. Simpson (PSU) and F. E. Marshall (NASA/GSFC)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200711A
170 s after the BAT trigger (Marshall et al., GCN Circ. 28078).
No optical afterglow consistent with the BAT position
(Marshall et al. GCN Circ 28078)
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           170          319          147         >20.2
white              170          999          310         >20.6
v                  404         4651          255         >18.7
b                  503          868           58         >19.1
u                  477         5088           80         >19.0
w1                 453         5061          255         >19.3
m2                 428          448           19         >18.0
w2                 379         4446          255         >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.96 in the direction of the burst
(Schlegel et al. 1998).