GCN Circular 17392

Subject

GRB 150202A: Swift/UVOT Upper Limits

Event

Date

2015-02-03T19:14:39Z (11 years ago)

From

Margaret Chester at PSU <chester@swift.psu.edu>

M. M. Chester (PSU) and H. A. Krimm (CRESST/GSFC/USRA)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 150202A
93 s after the BAT trigger (Krimm et al., GCN Circ. 17376Loading...
 
 ).
No optical afterglow consistent with the XRT position (Beardmore et al. 
GCN Circ. 17382Loading...
 
 ) 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            93          243          147         >20.6
u_FC               305          555          246         >20.2
white               93         6568          624         >21.5
v                  634         6980          530         >20.4
b                  560         7617          350         >21.3
u                  305         7594          756         >20.7
w1                 683         7390          510         >20.9
m2                 658         7185          452         >21.7
w2                 610         6774          490         >20.7

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).