[vsnet-grb-info 26279] GRB 200906A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28379
SUBJECT: GRB 200906A: Swift/UVOT Upper Limits
DATE:    20/09/07 16:13:35 GMT
FROM:    Sam LaPorte at PSU  <sjl5346 at psu.edu>

GRB 200906A: Swift/UVOT Upper Limits

J. D. Gropp (PSU) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 200906A
76 s after the BAT trigger (Page et al., GCN Circ. 28371).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 28373)
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            76          226          147         >21.2
u_FC               289          538          246         >20.4
white               76         5054          472         >21.3
v                  618         1413           97         >19.4
b                  544         4948          274         >20.1
u                  289         1487          324         >20.4
w1                 668         1462           97         >19.3
m2                 643         1438           78         >20.1
w2                 594         1389           97         >19.5

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.05 in the direction of the burst
(Schlegel et al. 1998).