GCN Circular 31643
S. Belkin (IKI, HSE), A. Pozanenko (IKI), N. Pankov (HSE), E. Klunko (ISTP) report on behalf of GRB IKI FuN: We observed ZTF22aabjpxh/AT2022cva discovered by ZTF (Ho et al., GCN 31619) with AZT-33IK telescope of Mondy observatory on 2022-02-21 and 2022-02-22. ZTF22aabjpxh/AT2022cva was observed also in optic (Kim et al., GCN 31628; Hu et al., GCN 31639) and in X-ray by NICER (Pasham et al., GCN 31635). ZTF22aabjpxh/AT2022cva is considered the likely afterglow of GRB 220219B (Ho et al., GCN 31619; Svinkin et al., GCN 31624). We clearly detect the SDSS galaxy at z=0.293 (Fremling et al., GCN 31629). Due to non-optimal seeing we could not discriminate the afterglow from the galaxy. We use aperture photometry and preliminary photometry of a source (afterglow+host galaxy) is following Date UT start JD Exp. Filter OT Err. UL(3sigma) (mid, days) (s) 2022-02-21 19:30:32 2.43966 30*120 R 19.19 0.03 22.8 2022-02-22 19:31:06 3.43936 29*120 R 19.34 0.03 22.8 The photometry is based on nearby SDSS DR12 stars id r R(Lupton) V(Lupton) J160337.10+311328.5 16.987 16.79 17.19 J160343.10+311452.9 18.700 18.51 18.90 Assuming the host galaxy has R = 19.7 we subtract a host galaxy flux from a flux of the source (afterglow+host galaxy) and estimated power law index of a light curve of the afterglow as -1.2, which is typical for a GRB afterglow.