GRB 200412B: continued AbAO, Mondy, TSHAO, Terskol optical observations
Abstract
We observed the field of GRB 200412B (Fermi GBM team, GCN 27547; Mailyan et al., GCN 27558; see also Burgess et al., GCN 27548; Longo et al., GCN 27557; Page et al., GCN 27561; Gupta et al., GCN 27563; Zheng et al., GCN 27565) with Zeiss-2000 of Mt.Terskol observatory, Zeiss-1000 1-m telescope of Tien Shan Astronomical Observatory, AZT-33IK 1.5-m telescope of Sayan observatory (Mondy) and AS-32 (0.7m) telescope of Abastumani Observatory. We still detected the afterglow of GRB 200412B (Lipunov et al., GCNs 27555, 27556; see also e.g. Kumar et al., GCN 27564; Belkin et al., GCN 27566, Stecklum et al., GCN 27567, Moskvitin GCN 27570; Xin et al., GCN 27571). Preliminary photometry of the afterglow is following. Date UT start t-T0 Filter OT Err. UL Observatory (mid, days) 2020-04-13 23:10:27 1.59707 18*120 R 20.57 0.03 22.8 Terskol Z-2000 2020-04-15 14:55:11 3.25105 15*120 V 21.95 0.14 22.8 Mondy AZT-33IK 2020-04-16 17:04:23 4.33800 11*120 R n/d n/d 20.5 Mondy AZT-33IK 2020-04-16 22:30:40 4.57812 61*60 R n/d n/d 22.2 AbAO AS-32 2020-04-17 14:51:32 5.25754 28*120 R 23.22 0.28 23.4 Mondy AZT-33IK 2020-04-17 19:53:06 5.47912 91*60 R n/d n/d 22.3 TSHAO Z-1000 2020-04-17 20:12:07 5.48573 36*120 R 23.29 0.29 23.4 Terskol Z-2000 The photometry is based on nearby USNO-B1.0 stars. The light curve based on on above photometry and photometry published earlier (Belkin et al., GCN 27574; Belkin et al., GCN 27566; Belkin et al., GCN 27583) can be found at http://grb.rssi.ru/GRB200412B/GRB200412B_LC.png (For reference, we also posted the photometric results of the Tautenburg Observatory (Klose et al., GCN 27593; Stecklum et al., GCN 27582; Klose et al., GCN 27575; Stecklum et al., GCN 27567). The index of power law decay taken from our R-filter observations up to 2.3 days is -1.58+/-0.07 (see also Xin et al. GCN 27571; Klose et al., GCN 27575). Later we may assume a jet break previously suggested by Klose et al. (GCN 27575) and Stecklum et al. (GCN 27567).
- Publication:
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GRB Coordinates Network
- Pub Date:
- April 2020
- Bibcode:
- 2020GCN.27604....1B