[vsnet-grb-info 12802] GRB 130122A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  14149
SUBJECT: GRB 130122A: Swift/UVOT Detection
DATE:    13/01/24 12:16:16 GMT
FROM:    Patricia Schady at MPE/Swift  <msslba at googlemail.com>

A. A. Breeveld (MSSL-UCL) and A. Y. Lien (NASA/GSFC/ORAU) report on behalf
of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 130122A 121 s
after the BAT trigger (Lien et al., GCN Circ. 14140). A source consistent
with the XRT position reported in (Beardmore et al., GCN Circ. 14143) is
seen in the initial exposures.

The preliminary UVOT position is:
    RA  (J2000) =  12:57:08.30 = 194.28459 (deg.)
    Dec (J2000) = +59:00:53.5  =  59.01487 (deg.)
with an estimated uncertainty of 0.53 arc sec. (radius, 90% confidence).

Preliminary detections and 3-sigma upper limits using the UVOT photometric
system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the finding
chart (FC) and earliest exposures are:

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

white_FC           121          271          148         18.75 ± 0.09
white              559          579           19         18.57 ± 0.23
v                  609          629           19        >17.9
b                  535          555           19         18.35 ± 0.32
u                  279          529          246         18.49 ± 0.14
uvw1              3974         5610          393        >20.9
uvm2              5205         5404          197        >20.0
uvw2              4795         4995          197        >20.4

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).