TITLE: GCN CIRCULAR NUMBER: 22102 SUBJECT: GRB 171030A: MASTER inspection of the IPN error box of the short GRB. DATE: 17/11/06 12:01:21 GMT FROM: 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 D.Svinkin 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, https://arxiv.org/abs/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 ). MASTER-OAFA, MASTER-IAC, MASTER-Tunka, MASTER-Kislovodsk and MASTER-SAAO 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 https://master.sai.msu.ru/site/master2/ligo_one.php?id=10072 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 ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) 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 http://master.sai.msu.ru/static/OT/031444.34-471210.0.png 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 http://www.aavso.org/vsx/index.php?view=detail.top&oid=193659 The discovery and reference images are available at: http://master.sai.msu.ru/static/OT/034515.40-015216.5.png 3). MASTER OT J034412.48-263556.5 discovery - PSNIa before maximum in 0"W,21"S of PGC134086 galaxy 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. 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, http://leda.univ-lyon1.fr/ledacat.cgi?PGC134086)_B=-21.1+-0.9 ). 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 2017-11-03 06:18:44 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 potentially 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 http://observ.pereplet.ru/images/VLNSmergrate.jpg 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 http://observ.pereplet.ru/images/GRB171030A_1.txt http://observ.pereplet.ru/images/GRB171030A_2.txt The message may be cited.