[vsnet-grb-info 14376] GRB 140102A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15690
SUBJECT: GRB 140102A: Swift/UVOT Detection
DATE:    14/01/06 03:33:36 GMT
FROM:    Mike Siegel at PSU/Swift MOC  <siegel at swift.psu.edu>

L. M. Z. Hagen (PSU) reports on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140102A 65 s
after the BAT trigger (Hagen et al., GCN Circ. 15653). We detect a fading
source consistent with the XRT position (Goad et al. GCN Circ. 15657) that
is detected in all but the bluest UVOT filters.

The preliminary UVOT position is:
    RA  (J2000) =  14:07:40.65 = 211.91939 (deg.)
    Dec (J2000) = +01:19:59.8  =   1.33329 (deg.)
with an estimated uncertainty of 0.50 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 early exposures are:

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

white (fc)          65          215          147         16.07 +/- 0.03
white              557         2215          322         18.38 +/- 0.05 
white             6222         7858          393         20.08 +/- 0.21
v                  607         2265          194         18.21 +/- 0.23
b                  533         2191          175         18.50 +/- 0.15
u (fc)             278          527          245         16.90 +/- 0.05
u                  681         2166          155         17.97 +/- 0.14
w1                 657         2142          175         19.10 +/- 0.33 
m2                 631         2117          175        >19.34
w2                6428         8034          364        >19.96

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.03 in the direction of the burst
(Schlegel et al. 1998).