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GCN Circular 20478

Subject
GRB 170115A: Swift/UVOT Upper Limits
Date
2017-01-17T16:39:49Z (7 years ago)
From
Mike Siegel at PSU/Swift MOC <siegel@swift.psu.edu>
M. H. Siegel (PSU) and K. L. Page (U. Leicester)
report on behalf of the Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 170115A
100 s after the BAT trigger (Page et al., GCN Circ. 20462).
No optical afterglow consistent with the enhanced XRT position
(Osborne et al. GCN Circ. 20465) 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 first
finding chart (FC) exposure and subsequent exposures are:

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

white (fc)         100          250          147         >20.40
white             4804         6335          291         >20.66
v                 5214        35195          816         >19.67
b                 4599        40415          838         >20.68
u (fc)             260          328           67         >18.98
u                 5829         6029          196         >19.65
uvw1              5624         5824          196         >19.32
uvm2              5419         5619          196         >19.37
uvw2              5009        11435          992         >20.69

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.07 in the direction of the burst
(Schlegel et al. 1998).
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