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GCN Circular 32217

Subject
GRB220611A: Gemini Optical Afterglow Confirmation
Date
2022-06-18T13:24:01Z (2 years ago)
From
Eleonora Troja at GSFC <eleonora.troja@nasa.gov>
B. O���Connor (UMD/GWU), E. Troja (U Tor Vergata/ASU) , S. Dichiara (PSU),
and S. B. Cenko (NASA/GSFC) report on behalf of a larger collaboration:

We carried out additional target of opportunity observations of GRB220611A
(Cenko et al.
GCN 32191) with the Gemini Multi Object Spectrograph (GMOS) mounted on the
Gemini-South
telescope. The observations began 5.7 d after the GRB trigger, and were
performed in
i-band for a total exposure of 540 s.

We detect the source reported by O���Connor et al. (GCN 32203) with magnitude
i~21 AB.
This source is not detected in archival images from the Dark Energy Survey
(Abbott et
al. 2021), and is likely the GRB afterglow. We determine that the X-ray,
optical,
and infrared data (O���Connor et al. GCN 32203, Rastinejad et al. GCN 32208)
can be
modeled by a power-law with spectral index beta~1.

Further observations are planned.

We thank the Gemini staff for rapid scheduling of these observations.
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