[vsnet-grb-info 26923] GRB 201209A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  29026
SUBJECT: GRB 201209A: Swift/UVOT Upper Limits
DATE:    20/12/11 13:01:06 GMT
FROM:    Kira Simpson at PSU  <kira.simpson1984 at gmail.com>

GRB 201209A: Swift/UVOT Upper Limits

K. K. Simpson (PSU) and J. D. Gropp (PSU)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 201209A
121 s after the BAT trigger (Gropp et al., GCN Circ. 29005).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 29009)
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           121          271          147         >20.1
u_FC               334          584          246         >20.3
white              121         1706          412         >20.9
v                  663         1583          117         >19.2
b                  590         1682          117         >19.5
u                  334         1657          343         >20.7
w1                 712         1632           97         >19.8
m2                 688         1260           39         >19.2
w2                1018         1211           39         >19.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.04 in the direction of the burst
(Schlegel et al. 1998).