GCN Circular 25657
Subject
GRB 190829A: Liverpool Telescope observations of a slow supernova rise
Event
Date
2019-09-04T16:36:59Z (6 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 another epoch of r/i/z imaging of the optical counterpart of
GRB 190829A (Dichiara et al., GCN 25552; Lesage et al., GCN 25575; Xu et
al., GCN 25555) with IO:O on the Liverpool Telescope Telescope on
2019-09-04 between 04:43 and 05:32 UT. Image subtraction was performed
using PS1 imaging as a template. We report the following photometry:
t-t0 filt mag unc
------ ---- ----- ----
5.3707 i 21.32 +/- 0.09
5.3941 z 20.61 +/- 0.10
This is consistent with a continued, slight rise compared to our
previous two LT epochs (e.g., i = 21.45 at t = 4.29 days; GCN 25623) and
with our earlier interpretation of the light curve flattening as the
appearance of an associated supernova. Spectroscopic confirmation is
still necessary to solidify this interpretation.
We note that our z-band measurement is 1 magnitude fainter than that
reported by Bolmer et al. (GCN 25651) at a similar epoch, and we do not
confirm the sharp, short-timescale rise that they report. It is
possible that the difference arises due to lack of host galaxy
subtraction in the GROND photometry.
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