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MASTER-OAFA: SN detection during IPN Fermi soft short GRB171030A inspection

ATel #10929; V. Lipunov, V. Shumkov (Lomonosov MSU), D. Svinkin (Ioffe Institute), E. Gorbovskoy, V. Kornilov, N. Tiurina (Lomonosov MSU), R. Podesta (OAFA), H. Levato (ICATE), P. Balanutsa, A. Kuznetsov, D. Zimnukhov, V. Chazov, D. Vlasenko, V. Vladimirov, O. Gress, I. Gorbunov, A. Krylov, D. Kuvshinov (Lomonosov Moscow State University, SAI), C. Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar San Juan University), C. Saffe (Instituto de Ciencias Astronomicas, de la Tierra y del Espacio), T. Pogrosheva, V. Gorelkina
on 6 Nov 2017; 12:11 UT
Credential Certification: Nataly Tyurina (tiurina@sai.msu.ru)

Subjects: Optical, Gamma Ray, Request for Observations, Gamma-Ray Burst, Supernovae, Transient, Variables

Referred to by ATel #: 10935, 10940

MASTER OT J034412.48-263556.5 discovery - PSN in 0"W,21"S of PGC134086

MASTER-OAFA auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L )
discovered OT source at (RA, Dec) = 03h 44m 12.48s -26d 35m 56.5s on 2017-11-06.23799 UT
during IPN Fermi soft short GRB171030A
(Fermi T_trig=2017-10-30 17:29:45.12 UT, Hamburg et al. GCN #22079, Kozlova et al. GCN #22076, Kienlin et al. GCN #21520)
inspection by MASTER Global Robotic Net (Lipunov et al. GCN #22080 , Lipunov et al. GCN#22102 ) .

This was soft short GRB, that can be off-axis gamma emission, produced by near (<50-100 Mpc) Neutron Stars merging (Burgess et al., Viewing short Gamma-ray Bursts from a different angles, arXiv:1710.05823 https://arxiv.org/abs/1710.05823 ).

The OT unfiltered magnitude is 18.7m (mlim=18.7m).
This PSN is in 0"W,21"S of PGC134086 (Btc=16.2, V_GSR,LG=19958km/s, M_B=-21.1+-0.9 )
There are 5 images with PSN:
2017-11-06 05:27:16UT - 2017-11-06 07:42:22UT
We have reference images without OT on 2017-09-27.19196 UT with unfiltered magnitude limit 20.1m, on 2017-11-03 06:18:44 with mlim=17.7.
Spectral observations are required.

The discovery and reference images are available at
http://master.sai.msu.ru/static/OT/034412.48-263556.5.png

List of Optical Transients discovered by MASTER

MASTER Global Robotic Net