GCN Circular 32943

Subject

GRB 221115B : MeerLICHT upper limits

Event

Date

2022-11-17T11:07:15Z (3 years ago)

From

Simon de Wet at UCT <dwtsim002@myuct.ac.za>

S. de Wet (UCT), P.J. Groot (Radboud/UCT/SAAO) report on behalf of the
MeerLICHT consortium:

We observed the Swift/BAT-GUANO localisation of GRB 221115B (DeLaunay et
al., GCN 32941Loading...
 
 ) with the 0.6m wide-field MeerLICHT optical telescope
situated in Sutherland, South Africa, obtaining 2x300s observations in the
q-band (roughly g+r) fully encompassing the 3' error box. Observations
began at 21:21:30 UT on 2022 November 16, 1.48 days post-trigger.

Employing our transient detection pipeline along with an archival reference
image, we detect no new transients within the GUANO error box down to a
5-sigma transient limiting magnitude of q > 20.80. Our new images had
full-frame 5-sigma limiting magnitudes of q = 22.10 and q = 22.18, while
our archival reference image had a limiting magnitude of q = 21.10. All
magnitudes are in the AB system.

MeerLICHT is built and run by a consortium consisting of Radboud
University, the University of Cape Town, the South African Astronomical
Observatory, the University of Oxford, the University of Manchester and the
University of Amsterdam.