GCN Circular 15894
Subject
GRB 140226A/iPTF14yb: Swift/UVOT Observations
Event
Date
2014-02-28T16:39:17Z (12 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU), F. E. Marshall (NASA/GSFC) and A. P. Beardmore (U. Leicester)
report on behalf of the Swift/UVOT team:
Swift/UVOT started observations of GRB140226A/iPTF14yb (Cenko et al., GCN Circ.
15833) 25718 s after the IPN trigger (Hurley et al., GCN Circ. 15888).
No optical counterpart is detected at the position of the iPTF or
XRT positions (Beardmore et al., GCN Circ 15884) in summed
exposures.
Preliminary 3-sigma upper limit using the UVOT photometric system
(Breeveld et al al. 2011, AIP Conf. Proc. 1358, 373) is:
Filter T_start (s) T_stop (s) Exp(s) Mag
uvm2 25718 43672 2180 >21.24
v 124093 136265 4877 >20.96
v 147705 154552 1822 >20.54
No correction has been made for the expected Galactic extinction
corresponding to E(B-V) = 0.02 in the direction of the burst (Schlegel et al. 1998).