GCN Circular 18017

Subject

GRB 150711A: Swift/UVOT Upper Limits

Event

Date

2015-07-12T09:05:59Z (11 years ago)

From

Paul Kuin at MSSL <npkuin@gmail.com>

N. P. M. Kuin (UCL-MSSL) and M. G. Bernardini (INAF-OAB) report
on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150711A
117 s after the BAT trigger (Bernardini et al., GCN Circ. 18011Loading...
 
 ).
No optical afterglow consistent with the XRT position (Osborne et al.
GCN Circ. 18012Loading...
 
 )  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           117          267          147         >21.4
u_FC               330          580          246         >20.2
white              117          909          235         >21.9
v                  660          852           39         >19.0
b                  585          778           39         >19.9
u                  330          753          265         >20.2
w1                 709          729           19         >18.8
m2                 684          704           19         >18.9
w2                 636          828           39         >18.8

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.09 in the direction of the burst
(Schlegel et al. 1998).