GCN Circular 12821

Subject

GRB 120106A: Swift/UVOT Upper Limits

Event

GRB 120106A

Date

2012-01-09T14:10:13Z (14 years ago)

From

Stefan Immler at NASA/GSFC <stefan.m.immler@nasa.gov>

S. Immler (CRESST/GSFC/UMD) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 120106A
65 s after the BAT trigger (Immler et al., GCN Circ. 12810Loading...
 
 ).
No optical afterglow consistent with the XRT position
(Evans et al., GCN Circ. 12813Loading...
 
 ) 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 coadded exposures are:

Filter         T_start(s)   T_stop(s)      Exp(s)         Mag

white              687         6326          451   >20.3
v                   65         11570         619   >20.0
b                  551         6736          452   >20.8
u                  296         6531          924   >20.8
w1                 678         6326          452   >20.3
m2                 652         6121          454   >20.2
w2                 603         11220         1239   >21.1

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.195 in the direction of the burst
(Schlegel et al. 1998).