Skip to main content
New Swift-BAT/GUANO and IceCube Notice Types Available! See news and announcements

GCN Circular 27271

Subject
GRB 200228B: Liverpool Telescope imaging
Date
2020-02-29T13:57:42Z (4 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.)










DisclaimerNone
Looking for U.S. government information and services? Visit USA.gov