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GCN Circular 22102

GRB 171030A: MASTER inspection of the IPN error box of the short GRB.
2017-11-06T12:01:21Z (7 years ago)
Vladimir Lipunov at Moscow State U/Krylov Obs <>
V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, D.Kuvshinov, 
P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko, I.Gorbunov, A.V.Krylov
Lomonosov Moscow State University,
Sternberg Astronomical Institute, Moscow State University

Ioffe Institute, St Petersburg

R. Podesta, Carlos Lopez and F. Podesta
Observatorio Astronomico Felix Aguilar (OAFA)

Hugo Levato and Carlos Saffe
Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE)

R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias

K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk
Irkutsk State University

A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory

V. Yurkov, A. Gabovich, Yu. Sergienko
Blagoveschensk Educational State University, Blagoveschensk

D. Buckley, S. Potter, A. Kniazev, M. Kotze
South African Astronomical Observatory

GRB171030A was detected by Fermi (Hamburg  and C. Meegan, GCN 22079) at 
17:29:45.12 UT on 30 October 2017. This is was slightly soft short GRB can be 
off-axis gamma emission produced by near (<50-100 Mpc) mergin Neutron Stars 
(Burgess et al., Viewing short Gamma-ray Bursts from a different angles, 
arXiv:1710.05823, ).

MASTER Robotic Net inspected IPN error box (Kozlova et al., GCN 22076) and its 
common parts with NSs merging rate MAP inside local 50 Mpc distance (see 
Lipunov, V. et al., GCN 22080 ).
covered 99% of the full IPN error box 
(1248 square degrees).
The common region of the NSs merging rate MAP inside local 50 Mpc distance and 
IPN has 112 square degrees and 256 square degrees correspondingly.
The avarage upper limit during this inspection was 18.5. The best limit 
was 19.5, worst was 18.0.

The coverage map is available at

  We  found 3  OTs:

1). MASTER OT J031444.34-471210.0 detection - New Dwarf Nova (Lipunov et 
al., ATel 
- 10928).

MASTER-OAFA auto-detection system ( <A 
HREF="">Lipunov et al., "MASTER 
Global Robotic Net", Advances in Astronomy, 2010, 30L</A> )
  discovered OT source at (RA, Dec) = 03h 14m 44.34s -47d 12m 10.0s on 
2017-11-03.21736 UT.

The OT unfiltered magnitude is 17.1m (mlim=18.6m).

The discovery and reference images are available at

2) MASTER OT J034515.40-015216.5 detection - CSS 090219:034515-015216 U Gem + 
Ursae Majoris Type Variables  at  outburst .

MASTER-IAC auto-detection system discovered OT source at
(RA, Dec) = 03h 45m 15.40s -01d 52m 16.5s on 2017-10-31.14317 UT.
The OT B magnitude is 14.6m (limit 18.3m), R magnitude is 14.4 .

We have reference unfiltered images on
2015-12-03 00:28:33.686 m_OT=19.5
2016-08-15 05:24:15.584 m_OT=19.3
2017-03-15 20:57:59.196 m_OT=19.6.

This OT is also known as CSS UGSU

The discovery and reference images are available at:

3). MASTER OT J034412.48-263556.5 discovery - PSNIa before maximum   in 
0"W,21"S of  PGC134086 galaxy

MASTER-OAFA auto-detection system ( <A 
HREF="">Lipunov et al., "MASTER 
Global Robotic Net", Advances in Astronomy, 2010, 30L</A> )
  discovered OT source at (RA, Dec) = 03h 44m 12.48s -26d 35m 56.5s on 
2017-11-06.23799 UT.

The OT unfiltered magnitude is 18.7m (mlim=18.7m). 
This OT(PSN) is  in 0"W,21"S of PGC134086  (Btc=16.2, V_GSR,LG=19958km/s, 
). The galaxy distance is aboute 300 Mpc.

There are 5 images with PSN:

2017-11-06 05:27:16UT

2017-11-06 05:42:42UT

2017-11-06 07:34:52UT

2017-11-06  07:38:38UT

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 <b> 2017-11-03 06:18:44</b> with mlim=17.7.  It   gives 
possibility to be a young PSN before maximum.

Spectral observations are required.

The only third optical transient  MASTER OT J034412.48-263556.5 is 
can be connected with collapse processes produce fast rotating NS (see 
Lipunov, V.M.,2017,  Double O-Ne-Mg  white dwarfs merging as the source of the 
powerfull gravitational waves  for LIGO/VIRGO type interferometers, New 
Astronomy, Volume 56, p. 84-85). But it is very bright and
very late  for Kilonova after 30 October 2017 NSs merging.

Maps are available at

The possible Swift localisation (D'Elia etal.,  GCN 22078 ) is shown by green 
square. Its optical limit is 19.5 (unfiltered and B) and 18.0 (I) between 
2017-10-31 22:43:33 UT and  2017-11-01  02:37:44 UT

Common IPN + NSsMerging probability Map two regions are available

The message may be cited.
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