{
  "bibcode": "2021GCN.30775....1B",
  "body": "S. Belkin (IKI), A. Pozanenko (IKI), O. Burhonov (UBAI), R. Ya. \nInasaridze (AbAO),  N. Pankov (IKI), V. R. Ayvazian (AbAO),  D. \nDatashvili (AbAO), G. V. Kapanadze (AbAO), Sh. Ehgamberdiev (UBAI) \nreport on behalf of IKI-GRB-FuN:\n\nWe observed the field of GRB 210610A (Page et al., GCN  30160) with \nAZT-22 telescope of Maidanak Observatory and AS-32 telescope of \nAbastumani observatory (AbAO). The optical afterglow (Page et al., GCN \n30160; Hosokawa et al., GCN 30161; Xu et a., GCN 30162; Kumar et al., \nGCN 30163; Lipunov et al., GCN 30166; de Wet et al., GCN 30168; Hosokawa \net al., GCN 30169; Sun et al., GCN 30185; Watson et al., GCN 30191; \nZheng et al., GCN 30203; Kann et al., GCN 30211; Belkin et al., GCN \n30214; Moskvitin et al., GCN 30229; Kann et al., GCN 30232; Siegel et \nal., GCN 30246) is clearly detected in the stacked images. Preliminary \nphotometry of the afterglow is following.\n\nDate UT start t-T0 Filter Exp. OT UL(3sigma) Telescope\n                         (mid, days) (s)\n\n2021-06-10 17:57:56 0.14529 R 14*300 19.62 0.03 24.0 AZT-22\n2021-06-10 20:24:59 0.23769 R 42*60  20.46 0.25 20.6 AS-32\n2021-06-12 16:34:08 2.07494 R 7*300  23.09 0.20 23.5 AZT-22\n2021-06-13 16:44:01 3.09049 R 12*300 23.77 0.21 24.4 AZT-22\n2021-06-14 17:25:22 4.11920 R 12*300 24.08 0.28 24.4 AZT-22\n\nPhotometry is based on the SDSS-DR12 nearby stars (Lupton transformations).\nSDSS-DR12_id RA DEC R(Lupton)\nJ133717.13+142854.9 204.32139900 +14.48192200 17.0295\nJ133703.62+142832.7 204.26512000 +14.47576300 17.7239\n\nUsing our data in the R filter, it was found that the light curve can be \ndescribed by a broken power-law with power law indices of -0.82 and \n-1.39. The break time is 0.23+/-0.17 days. These values are consistent \nwith the result reported by Kann et al. (GCN 30211).\n\nThe light curve can be found at\nhttp://grb.rssi.ru/GRB210610A/GRB210610A_LC.png",
  "circularId": 30775,
  "createdOn": 1630884197000,
  "email": "apozanen@iki.rssi.ru",
  "subject": "GRB 210610A: Maidanak and AbAO optical observations",
  "submitter": "Alexei Pozanenko at IKI, Moscow  <apozanen@iki.rssi.ru>",
  "eventId": "GRB 210610A"
}