GCN Circular 19256

Subject

GRB 160401A: Swift/UVOT Upper Limits

Event

Date

2016-04-02T20:08:19Z (10 years ago)

From

Paul Kuin at MSSL <npkuin@gmail.com>

Paul Kuin (MSSL/UCL) and L.M. McCauley (PSU) report on behalf of the
Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160401A
43ks s after the INTEGRAL trigger (Mereghetti et al., GCN Circ.19251Loading...
 
 ).
No optical afterglow consistent with the INTEGRAL position is detected
in the initial UVOT exposures. The burst location was also observed by
MASTER-IAC (Rebolo et al., GCN Circ. no. 19252); LT (Guidorzi et al.
GCN Circ. no. 19254), and the Zadko observatory (Klotz et al. GCN
Circ. 19255Loading...
 
 ); none of whom observed an afterglow.
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

white            43678        44209          522         >20.8
v                44509        45370          843         >19.5
u                42847        43671          811         >19.9

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 1.13 in the direction of the burst
(Schlegel et al. 1998).

[GCN OPS NOTE(02apr16):  The letter 'A' was added to the GRB name.]