[vsnet-grb-info 24065] GRB 191101A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26164
SUBJECT: GRB 191101A: Swift/UVOT Upper Limits
DATE:    19/11/04 19:01:00 GMT
FROM:    Sam LaPorte at PSU  <sjl5346 at psu.edu>

GRB 191101A: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and A. D'Ai (INAF-IASFPA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 191101A
110 s after the BAT trigger (D'Ai et al., GCN Circ. 26135).
No optical afterglow consistent with the XRT position
(Beardmore et al. GCN Circ. 26140)
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           110          259          147         >21.1
u_FC               268          517          246         >20.3
white              110         5863          589         >21.6
v                  597         1588          110         >19.6
b                  523         5658          294         >21.2
u                  268         5453          540         >20.9
w1                 646         5248          294         >19.3
m2                 622         5043          300         >19.8
w2                 573         1564          117         >19.3

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).