GCN Circular 30578
Subject
GRB 210731A: MASTER optical afterglow detection
Date
2021-08-01T18:45:53Z (3 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, N.Tyurina, K.Minkina, I.Gorbunov,
P.Balanutsa,V.Vladimirov, A.Kuznetsov, D.Cheryasov (Lomonosov Moscow State
University,SAI, Physics Department),
O.A. Gres, N.M. Budnev (Irkutsk State University, API),
R. Podesta, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar
OAFA),
R. Rebolo, M. Serra, N. Lodiu (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
R. Podesta, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar
OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
Three MASTER robotic telescopes (Global MASTER-Net:
http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy,
vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan
National University) in Spain (IAC, Canary) and South Africa (SAAO observatory) automatically
observed Swift GRB 210801A (Troja et al., GCN 30568) started 60-70s after
trigger (Lipunov ) up to 2021-08-01 09:16:46 (Lipunov et al., GCN 30567).
MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic
Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 20h 01m 13.07s , -28d 03m 39s.6
(err = +-0".9).
The OT magnitude in 'clear' filter is 18.3m (mlim = 19.8) at plato ( see
detection de Wet et al., GCN 30570).
The OT is seen in dozeens images. There is no minor planet at this place.
We have reference image on 2017-08-22.12663 UT with 'clear' filter 19.7m.