[vsnet-grb-info 14538] GRB 140215A: Swift/UVOT Detection

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  15852
SUBJECT: GRB 140215A: Swift/UVOT Detection
DATE:    14/02/17 00:15:50 GMT
FROM:    Lea Hagen at PSU  <lea.zernow.hagen at gmail.com>

L. M. Z. Hagen (PSU) and C. B. Markwardt (NASA/GSFC) report on behalf of
the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 140215A 126 s
after the BAT trigger (Markwardt et al., GCN Circ. 15837). A source
consistent with the XRT position (Evans et al. GCN Circ. 15842) is detected
in the initial UVOT exposures.

The preliminary UVOT position is:
    RA  (J2000) =  06:56:35.81 = 104.14920 (deg.)
    Dec (J2000) = +41:47:11.7  =  41.78659 (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)         125          275          147         15.01 +/- 0.04
white              617          637           19         16.26 +/- 0.07
v                  106          117           10         14.34 +/- 0.09
b                  593          612           19         16.19 +/- 0.09
u                  337          587          245         15.53 +/- 0.05
w1                4611         4811          196        >19.86
m2                4406         4606          196        >19.51
w2                 642          662           19        >17.93

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.09 in the direction of the burst
(Schlegel et al. 1998). We note that the white photometry may be affected
by a nearby bright foreground star.