GCN Circular 31974
Subject
GRB 220430A: MeerLICHT optical upper limits
Event
Date
2022-04-30T19:04:51Z (4 years ago)
From
Paul Groot at Radboud University Nijmegen <p.groot@astro.ru.nl>
P.J. Groot (Radboud/UCT/SAAO), S.de Wet (UCT), D.B. Malesani
(Radboud, DAWN/NBI), A.J. Levan (Radboud), P.M. Vreeswijk (Radboud),
report on behalf of the MeerLICHT consortium:
GRB220430A (Ambrosi et al., GCN 31972) triggered automatic observations
with the 0.6m wide-field MeerLICHT telescope, located at Sutherland,
South Africa. Observations started at 2022-04-30, 17:10:19 UT in a
series of 60s integrations in an alternating sequence of the
u,g,q,r,i,z bands. Observations were stopped after 2022-04-30,
17:27:48 UT due to the visibility of the source location.
A preliminary analysis of the u, q and i-band images shows no new
optical transient in these bands within the Swift-BAT error circle,
including the position of the new X-ray source detected in the Swift-XRT
observations.
Five-sigma limiting magnitudes for an optical transient located at the
Swift-XRT position are:
u > 19.0 at 17:11:46 UT,
q > 20.4 at 17:13:14 UT,
i > 18.6 at 17:20:32 UT.
Further analysis is ongoing
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.