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GCN Circular 16662

Subject
GRB 140801A: Swift/UVOT Upper Limits
Date
2014-08-02T18:10:39Z (10 years ago)
From
Lea Hagen at PSU <lea.zernow.hagen@gmail.com>
L. M. Z. Hagen (PSU) and E. Troja (NASA/GSFC/UMCP) report on behalf
of the Swift/UVOT team:

The Swift/UVOT observed the field of the Fermi/GBM-detected burst GRB 140801A
beginning 36.4 ks after the trigger (Pelassa, GCN Circ. 16658). No optical
afterglow consistent with the XRT candidate (Maselli, GCN Circ. 16661) or
MASTER candidate (Gorbovskoy et al., GCN Circ. 16653) is detected in the
initial UVOT exposures.
Preliminary 3-sigma upper limits using the UVOT photometric system
(Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the initial exposures are:

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

uvw1             36391        47996         1944        >20.70

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.226 in the direction of the burst
(Schlegel et al. 1998).
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