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 33240

ZTF23aaarlti/AT2023avj: Assy continued optical observations
2023-01-31T17:15:27Z (a year ago)
Alexei Pozanenko at IKI, Moscow <>
N. Pankov (HSE, IKI), V. Kim (FAI, Pulkovo Observatory), A. Pozanenko 
(IKI), M. Krugov (FAI), S. Belkin (IKI) report on behalf of GRB IKI FuN:

We observed the  optical source ZTF23aaarlti/AT2023avj (Wang et al., GCN 
33226) with AZT-20 telescope of Assy-Turgen observatory starting on 
2023-01-28 (UT) 13:40:30.

We clearly detect the optical source (Wang et al., GCN 33226; Pankov et 
al., GCN 33227) which is also detected in radio (Perley  et al., GCN 
33233) and in X-ray (Ho et al., GCN 33238).

Preliminary photometry of the optical afterglow in a stacked image is 

Date       UT start  MJD        Exp.  Filter   OT     Err.  UL(3sigma)
                    (mid, days)  (s)

2023-01-28 13:40:30  59972.5698 90*60 r'(AB)   23.10  0.15   24.1

The photometry is based on nearby PS1 stars.
Looking for U.S. government information and services? Visit