[vsnet-grb-info 17729] GRB 160310A: Swift/UVOT Upper Limits

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  19168
SUBJECT: GRB 160310A: Swift/UVOT Upper Limits
DATE:    16/03/11 22:47:55 GMT
FROM:    Frank Marshall at GSFC  <femarsha at khamseen.gsfc.nasa.gov>

F. E. Marshall (NASA/GSFC) and A. Maselli (INAF/IASF)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160310A
40247 s after the LAT trigger (Vianello et al., GCN Circ. 19158).
No source is detected in the initial UVOT exposures
at a position consistent with the position
of the possible XRT afterglow (Gibson et al., GCN Circ. 19162)
or the possible optical counterpart (Kruehler et al., GCN Circ. 19164).
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

u                40247        46726         1273         >20.4
white            41072        41890          805         >21.3
v                41897        42757          843         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.53 in the direction of the burst
(Schlegel et al. 1998).