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GCN Circular 18381

Subject
GRB 151001A: Swift/UVOT Detection
Date
2015-10-02T12:44:45Z (9 years ago)
From
Alice Breeveld at MSSL-UCL <a.breeveld@ucl.ac.uk>
A. A. Breeveld (UCL-MSSL) and M. Stamatikos (OSU/NASA/GSFC) report on 
behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 151001A 46 
s after the BAT trigger (Stamatikos et al., GCN Circ. 18373).
A fading source consistent with the enhanced XRT position (Beardmore et 
al. GCN Circ. 18376) is detected in the initial UVOT exposures.

The preliminary UVOT position is:
     RA  (J2000) =  15:34:54.90 = 233.72875 (deg.)
     Dec (J2000) = +10:58:02.2  =  10.96728 (deg.)
with an estimated uncertainty of 0.43 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               67          217          147         17.82 �� 0.06
white              559          578           20         19.5  �� 0.3
v                   46         1403          110         18.78 �� 0.29
b                  534         1502           97         19.60 �� 0.29
u                  279          529          246         19.13 �� 0.15
w1                 657         1453           97        >19.3
m2                 806         1428           39        >18.0
w2                1358         1552           39        >18.4

The magnitudes in the table are not corrected for the Galactic 
extinction due to the reddening of E(B-V) = 0.04 in the direction of the 
burst (Schlegel et al. 1998).
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