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 21115

GRB 170519A: KAIT Optical Observations
2017-05-19T18:44:38Z (7 years ago)
Weikang Zheng at UC Berkeley <>
WeiKang Zheng, Max Genecov, and Alex Filippenko (UC Berkeley) report on
behalf of the KAIT GRB team:

The 0.76-m Katzman Automatic Imaging Telescope (KAIT) at
Lick Observatory responded to Swift GRB 170519A (Ukwatta et al.,
GCN 21106) starting at 05:14:24 UT, 262s after the burst.
Observations were performed with an automatic sequence in the
V, I, and clear (roughly R) filters, and the exposure time was
20 s per image, observations lasted about 2 hours.
The optical afterglow (Ukwatta et al., GCN 21106; Izzo et al.,
GCN 21108; Butler et al., GCN 21109; Guidorzi et al., GCN 21110;
Xu et al., GCN 21111; Hentunen & Nissinen, GCN 21113) was well
detected in our V, I and clear filter images. A preliminary
analysis shows that the afterglow rises at early time and peaked
around 1 ks. After 3 ks after the burst, the light curve can be
fitted by a power law with index of -0.83.
A preliminary light curve is posted at:
Looking for U.S. government information and services? Visit