GCN Circular 32516
Subject
GRB 220831A: DECam detection of a possible optical counterpart
Event
Date
2022-09-02T15:47:51Z (3 years ago)
From
Anais Moller at Australian National U <anais.moller@anu.edu.au>
GRB 220831A: DECam detection of a possible optical counterpart
J. Freeburn, N. Van Bemmel, D. Dobie, A. Moller, J. Cooke (Swinburne/OzGrav), M. Suhr (Swinburne/ASTRO 3D) report on behalf of the Deeper Wider Faster Collaboration
We have observed the Swift/BAT-GUANO localisation of GRB 220831A (GCN 32506) with the Dark Energy Camera (DECam) on the V. M. Blanco 4-m telescope. Imaging in g, r, i were carried out on UT dates 2022-08-31 and 2022-09-01 as part of an ongoing Deeper, Wider, Faster (DWF) program observing run.
We detect a source that is spatially coincident with the X-ray (GCN 32510) and near-infrared (GCN 32513) candidate counterpart and is not detected in archival imaging of the field.
RA = 01:37:0.965
DEC = -41:35:34.60
We measure:
59823.3 i = 23.13 +/-0.15
59824.3 i = 24.12 +/-0.28
59823.3 r = 23.06 +/-0.12
59824.3 r = 24.32 +/-0.20
59823.1 g < 23.9
59824.3 g < 24.6
Deep spectroscopy is encouraged. We will continue to monitor this source with DECam as part of DWF.