GCN Circular 25623
Subject
GRB 190829A: Flattening of optical light curve from continued Liverpool Telescope photometry
Date
2019-09-03T05:28:44Z (5 years ago)
From
Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>
D. A. Perley and A. M. Cockeram (LJMU) report:
We obtained further observations of the afterglow of GRB 190829A
(Dichiara et al., GCN 25552; Lesage et al., GCN 25575; Xu et al., GCN
25555) with the IO:O imager on the 2m robotic Liverpool Telescope.
Observations were conducted on 2019-09-02 (03:33-04:03 UT) and
2019-09-03 (02:46-03:36 UT).
In all three filters, the optical afterglow has slowed its decay from
its previous power-law decline (GCN 25597), with little additional
evolution in flux over the past 48 hours. There is tentative evidence
for rebrightening in the i-band. We interpret this as the beginning of
the rise of an associated supernova, but this still requires
spectroscopic confirmation.
Additional i-band photometry (all subtracted versus PS1 reference
imaging, with times in days referenced to the Swift trigger) is as follows:
t-t0 filt mag unc
------ ---- ----- ----
3.3193 i = 21.69 +/- 0.12
4.2889 i = 21.45 +/- 0.12
DisclaimerNone