MASTER OT J105242.66+152355.0 discovery as possibly optical counterpart of Fermi GRB 210120A
ATel #14339; V. Lipunov (Lomonosov MSU), R. Podesta (OAFA), V. Kornilov, E. Gorbovskoy, O. Gress, N. Tiurina, P. Balanutsa, F. Balakin, V. Vladimirov, A. Kuznetsov, K. Zhirkov, D. Vlasenko, I. Gorbunov, D. Zimnukhov, V. Senik, A. Chasovnikov, A. Pozdnyakov, V. Topolev, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), C. Lopez, F. Podesta, C. Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), N. M. Budnev (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V. Yurkov (Blagoveshchensk State Pedagogical University), T. Pogrosheva, V. Shumkov, E. Minkina, V. Grinshpun
on 20 Jan 2021; 21:06 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)
Subjects: Optical, Gamma Ray, Request for Observations, Gamma-Ray Burst, Transient, Variables
MASTER OT J105242.66+152355.0 discovery - optical counterpart of Fermi GRB 210120A
MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L)
automatically was pointed (Lipunov et al. GCN #29336)
to Fermi GRB210120A (Ttrigger=07:10:44UT, Fermi GCN #29334, BALROG localization Biltzinger et al. GCN #29335,
Barthelmy GRB210120A page https://gcn.gsfc.nasa.gov/other/210120A.gcn3)
80s after notice time (143s after trigger time) at 2021-01-20 07:13:07UT
(see cover map and OT position)
MASTER auto-detection system (Lipunov et al. 2010)
discovered fast changing optical transient
MASTER OT J105242.66+152355.0 / AT2021axc
at (RA, Dec) = 10h 52m 42.66s +15d 23m 55.0s at 2021-01-20 07:20:30UT
with unfiltered m_OT=18.6 at the beginning stage.
The OT is seen at several images.
There is no any sources at this place in MASTER database since 2004.
The nearest source in VIZIER is SDSS galaxy in 4.9" with rmag(as most
closest to MASTER unfiltered)=22.217 (22.088 in PanSTARRS).
Deep photometry and spectral observations are required
MASTER Global Robotic Net
