GCN Circular 22086

Subject

GRB 171102B: Swift/UVOT Upper Limits

Event

Date

2017-11-03T05:32:40Z (9 years ago)

From

Sam LaPorte at PSU <sjl5346@psu.edu>

GRB 171102B: Swift/UVOT Upper Limits

S. J. LaPorte (PSU) and T. N. Ukwatta (LANL)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 171102B
125 s after the BAT trigger (Ukwatta et al., GCN Circ. 22082Loading...
 
 ).
No optical afterglow consistent with the XRT position
(Osborne et al. GCN Circ. 22084Loading...
 
 )
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          4979         5129          147         >20.2
u_FC               125          375          246         >19.8
white             4979         5749          344         >20.5
v                  432        11930         1160         >19.3
b                  381        18368         1057         >20.5
u                  125        24106         2391         >21.5
w1                 481        23421         2042         >20.7
m2                 456        22515         1843         >21.3
w2                 407        11017         1179         >20.7

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.75 in the direction of the burst
(Schlegel et al. 1998).