GCN Circular 15768

Subject

GRB 140129A: Swift/UVOT Observations

Event

Date

2014-01-29T16:52:45Z (12 years ago)

From

Craig Swenson at PSU/Swift <cswenson@astro.psu.edu>

C. A. Swenson (PSU) and A. Melandri (INAF-OAB)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140129A
117 s after the BAT trigger (Melandri et al., GCN Circ. 15760Loading...
 
 ).
A source consistent with the XRT position (Evans et al. GCN Circ. 15764Loading...
 
 )
is detected in the initial UVOT exposures.

The preliminary UVOT position is:
     RA  (J2000) =  02:31:33.78 =  37.89076 (deg.)
     Dec (J2000) = -01:35:43.4  =  -1.59539 (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              117          267          147 16.51 � 0.03
v                  605         1250           78 18.69 � 0.24
b                  531          551           20 17.76 � 0.14
u                  275          525          246 16.98 � 0.04
w1                 654        17641         1357 20.77 � 0.22
m2                5292        13449         1054 >21.2
w2                 753        11858         1102 >22.0

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).