GCN Circular 30268
Subject
GRB 210619B: SARA-KP 0.9m Optical Afterglow Detection
Event
Date
2021-06-20T08:18:35Z (4 years ago)
From
Kyle Pellegrin at Clemson University <pelleg2@g.clemson.edu>
K. Pellegrin, S. Anandagoda, and D. Hartmann report:
We observed the field of GRB 210619B detected by Swift BAT (D���Avanzo et al.,
GCN #30261), Global MASTER-Net (Lipunov et al., GCN #30262), GECAM (Zhao et
al., GCN #30264), iTelescope (Kong, GCN #30265), and Ondrejov D50 (M.
Jelinek et al., GCN #30263) using the SARA 0.9m optical telescope located
at Kitt Peak, AZ, USA, equipped with the Alta-E6-1105 camera.
Observation started at 05:19:14 UTC on 2021-06-20 and ended at 06:13:23 UTC
on 2021-06-20. We obtained a series of 60s exposure frames in the
Johnson-Cousins R filter. We detect the optical afterglow of GRB 210619B at
the enhanced Swift-XRT position (Beardmore, et al., GCN #30267).
The estimated magnitude of the GRB afterglow was found by stacking 20
images of 60s each in the Johnson-Cousins R band filter. The GRB was
visible in each of the stacked images.
T_start-T0 (hrs) T_end-T0 (hrs) Start Date (UTC) Filter Magnitude
(mag)
----------------------------------------------------------------------------------------------------------------
----------------------------------------------------------------------------------------------------------------
5.32 5.70 2021-06-20T05:19:14 R 18.51
5.73 6.22 2021-06-20T05:43:59 R 18.77
Photometry is done based on the PanSTARRS catalog.
The Southeastern Association for Research in Astronomy (SARA) consortium
operates three telescopes: the 0.9-m SARA-KP at Kitt Peak in Arizona, and
the 0.6-m SARA-CT at Cerro Tololo in Chile, and the 1.0-m SARA-RM (formerly
the JKT) telescope at Roque de los Muchachos Observatory in the Canary
Islands. For more information see: Keel et al. (2016):
https://iopscience.iop.org/article/10.1088/1538-3873/129/971/015002
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