GCN Circular 36824

 A. Volnova (IKI), A. Moskvitin (SAO RAS), A. Pozanenko (IKI), D. Oparin
(SAO RAS), N. Pankov (IKI, HSE), S. Belkin (IKI, HSE) on behalf of GRB IKI
FuN report:

We observed the TRT candidate afterglow position (An et al., GCN 36815
Not found
 
 
) of
the X-ray transient EP240703a (Wang et al., GCN 36807
Not found
 
 
) and probable
gamma-ray burst GRB 240703A (Frederiks et al., GCN 36809
Not found
 
 
) with BTA SAO RAS
telescope equipped with SCORPIO-1 camera in Ic filter starting on
2024-07-03 (UT) 20:50:07, i.e. 0.856 days after burst.
We did not detect the TRT candidate afterglow (An et al., GCN 36815
Not found
 
 
) which
might be a spurious event (An et al., GCN 36820
Not found
 
 
). At the stacked images of
9x180 s we obtained an upper limit of Ic= 24.6m (3 sigma). We cannot
confirm that the TRT afterglow candidate (An et al., GCN 36815
Not found
 
 
) is real.
Our result is consistent with reported results (Aryan et al., GCN 36819
Not found
 
 
,
Bochenek and Perley GCN 36821
Not found
 
 
; Fernandez-Garcia et al., GCN 36822
Not found
 
 
).

We are grateful to the Directorate of the Special Astrophysical Observatory
for allocation of  the TOO observation.