[vsnet-grb-info 26710] GRB 201029A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  28810
SUBJECT: GRB 201029A: Swift/UVOT Upper Limits
DATE:    20/10/30 17:25:08 GMT
FROM:    Frank Marshall at Swift/UVOT  <marshall at milkyway.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and S. Dichiara (NASA/GSFC/UMCP)

report on behalf of the Swift/UVOT team:



The Swift/UVOT began settled observations of the field of GRB 201029A

131 s after the BAT trigger (Dichiara et al., GCN Circ. 28803).

No optical afterglow consistent with the XRT position

(Beardmore et al. GCN Circ. 28806)

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           131          281          147         >20.6

u_FC               289          539          246         >19.9

white              131         1708          412         >21.4

v                  619         1759          127         >19.2

b                  545         1858          136         >19.9

u                  289         1833          362         >20.0

w1                 842         1808           97         >19.5



The magnitudes in the table are not corrected for the Galactic extinction

due to the reddening of E(B-V) = 0.02 in the direction of the burst

(Schlegel et al. 1998).