Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 19194

GRB 160313A: Swift/UVOT Upper Limits
2016-03-15T16:18:15Z (8 years ago)
Marissa McCaule at PSU <>
L. M. McCauley (PSU) and A. D'Ai (INAF-IASFPA) reports on behalf of the
Swift/UVOT team:

The Swift/UVOT began settled observations of the field of GRB 160313A
198 s after the BAT trigger (D'Ai et al., GCN Circ. 19171).
No optical afterglow consistent with the XRT position
(Goad et al. GCN Circ. 19174) 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              198         920         418        >20.77
white                 198        5756         664        >21.01
v                     355        6167         451        >19.78
b                     454        5552         254        >20.24
u                     430        6588         260        >19.44
uvw1                  405        6577         451        >19.93
uvm2                 4737        6372         393        >19.17
uvw2                 4328        5962         393        >19.99

The magnitudes in the table are not corrected for the Galactic extinction
due to the reddening of E(B-V) = 0.01 in the direction of the burst
(Schlegel et al. 1998).
Looking for U.S. government information and services? Visit