Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
New Announcement Feature, Code of Conduct, Circular Revisions. See news and announcements

GCN Circular 32245

GRB 220623A: iTelescope optical upper limit
2022-06-23T10:17:01Z (2 years ago)
Filipp Dmitrievich Romanov at Amateur astronomer <>
I observed the field of GRB 220623A (Sbarufatti et al., GCN Circ.
32243) remotely using telescope T24 (0.61-m f/6.5 reflector + CCD) of
iTelescope.Net in Sierra Remote Observatory (Auberry, California, USA)
on 2022-06-23. Three images (exposures 300 seconds, BINx1) were
obtained with Ic filter with mid time 09:26:42 UTC (8548 seconds after
the trigger). I did not detect any optical afterglow in the BAT and
the XRT (Kennea et al., GCN Circ. 32244) positions. The magnitude
limit is about 18 mag, compared to the magnitudes of nearby stars from
the USNO-B1.0 Catalog (Monet et al., 2003).
F. D. Romanov.
Looking for U.S. government information and services? Visit