MASTER: unique late maximum of optical counterpart from ultralong GRB 200612A
ATel #13803; V. Lipunov (Lomonosov MSU), D. Svinkin (Ioffe Institute), R. Podesta (OAFA), E. Gorbovskoy, V. Kornilov, N. Tyurina, I. Gorbunov, P. Balanutsa, A. Kuznetsov, F. Balakin, V. Vladimirov, D. Vlasenko, D. Zimnukhov, V. Senik, T. Pogrosheva, D. Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), F. Podesta, C. Francile (OAFA), H. Levato (ICATE), R. Rebolo, M. Serra (IAC), D. Buckley (SAAO), O. A. Gres, N. M. Budnev (ISU, API), A. Tlatov (KSS of the Pulkovo Observatory), A. Gabovich, Yu. Sergienko, V. Yurkov(BSPU)
on 12 Jun 2020; 20:17 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)
Subjects: Optical, X-ray, Gamma Ray, Request for Observations, Gamma-Ray Burst, Transient, Variables
MASTER OT J201048.64-452006.7 discovery - optical counterpart of ultralong GRB 200612A
MASTER Global Robotic Net ( Lipunov et al., "MASTER Global Robotic Net",
Advances in Astronomy, 2010, 30L )
started alert observation of Swift GRB 200612A (Sonbas et al. GCN #27915)
10s after notice time (Lipunov et al. GCN #27916, GCN #27917, GCN #27920)
at 2020-06-12 04:47:52 UT (495 sec after trigger time).
The optical counterpart MASTER OT J201048.64-452006.7 was discovered by MASTER auto-detection system (GCN #27917) more then 10 minutes after trigger time.
We report late optical maximum (~20 min after trigger time) of this
unique very long GRB , see Konus-Wind team report (Svinkin et al. GCN #27922)
Deep photometry is requested (5.2h later there is no OT up to 20.3 , Hu et al. GCN #27919).
MASTER Global Robotic Net
