GCN Circular 27271
Subject
GRB 200228B: Liverpool Telescope imaging
Event
Date
2020-02-29T13:57:42Z (6 years ago)
From
Daniel Perley at Liverpool JMU <d.a.perley@ljmu.ac.uk>
D. A. Perley and A. M. Cockeram (LJMU) report:
On 2020-02-29 UT we obtained imaging of the position of GRB 200228B
(Fermi GBM team, GCN 27253; Laha et al., GCN 27254) using the 2m robotic
Liverpool Telescope. We collected 3x120s of exposure time in each of
the the i-band and z-band filters, beginning at 05:53:44 and ending at
06:07:33 (UTC).
No unambiguous source is detected in either stacked image, although a
possible marginal (~3-sigma) source is present close to the center of
the latest enhanced XRT error circle in the z-band image. Photometry of
this potential source (calibrating relative to PS1 catalog stars in the
field) gives an approximate magnitude of z = 21.7 +/- 0.3.
3-sigma limits are:
dt(days) filter mag
0.7794 i >22.6
0.7844 z >21.7
We additionally note that Pan-STARRS1 imaging of the field shows several
faint, probably-resolved sources close to the survey detection limit
inside or closely outside the XRT error circle, which could represent a
possible host galaxy or host group.
Imaging of the field is available at:
http://www.astro.ljmu.ac.uk/~aridperl/grb/200228b/GRB200228B_LT_PS1.png
(The enhanced XRT error circle is shown in cyan with the marginal
"detection" highlighted in red.)
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