GCN Circular 18931

Subject

GRB 160123A: Swift/UVOT Upper Limits

Event

Date

2016-01-23T21:44:10Z (10 years ago)

From

Massimiliano de Pasquale at IASF-Palermo <m.depasquale@ucl.ac.uk>

M. De Pasquale (UCL-MSSL) and D. Malesani (DARK/NBI)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160123A
82 s after the BAT trigger (Malesani et al., GCN Circ. 18926Loading...
 
 ).
No optical afterglow consistent with the XRT position (Beardmore et al.
GCN Circ. 18927Loading...
 
 ) 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            82          231          147         >20.7
u_FC               296          545          246         >19.9
white               82         1196         1041         >21.8
v                  626        11136         1191         >20.3
b                  551        17792         1337         >21.4
u                  296        17792         1563         >20.4
w1                 675        12760         1152         >19.2
m2                 650        12040         1160         >20.0
w2                 601         6977          471         >21.0

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.10 in the direction of the burst
(Schlegel et al. 1998).