[vsnet-grb-info 17502] GRB 160123A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  18931
SUBJECT: GRB 160123A: Swift/UVOT Upper Limits
DATE:    16/01/23 21:44:10 GMT
FROM:    Massimiliano de Pasquale at IASF-Palermo  <m.depasquale at 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. 18926).
No optical afterglow consistent with the XRT position (Beardmore et al.
GCN Circ. 18927) 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).