TITLE: GCN CIRCULAR NUMBER: 23322 SUBJECT: GRB 181008B: Global MASTER Net optical inspection DATE: 18/10/11 07:59:47 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa,A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute D.Svinkin (Ioffe Institute, Russia) R. Podesta, F. Podesta, C. Lopez, C.Francile Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato 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 D. Buckley, South African Astronomical Observatory A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory O. Gres, N.M. Budnev, Yu.Ishmuhametova Applied Physics Institute of Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk MASTER-SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) was starting survey on the IPN GRB181008.88 error-box (Svinkin et al., GCN 23318) 26827 sec after notice time and 1 days 8072 sec after trigger time at 2018-10-09 23:19:04 UT. The 5-sigma upper limit on our first (180s exposure) set is about 19.0 mag Link to GRB181008.88 page: https://master.sai.msu.ru/site/master2/ligo.php?af=1&wh=tabs(grbtime-'2018-10-08+21:04:32')%3C'1+minutes'::interval The message may be cited. The galactic latitude b = -60 deg., longitude l = 98 deg. The observations made on zenit distance = 42 deg.The moon ( 1 % bright part) below the horizon (The altitude of the Moon is -52 deg. ). The sun altitude is -49.0 deg. The object can be observed till 2018-10-10 03:24:40 MASTER-Kislovodsk robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was starting survey on the IPN GRB181008.88 error-box 28923 sec after notice time and 1 days 10168 sec after trigger time at 2018-10-09 23:54:00 UT. The 5-sigma upper limit on our first (180s exposure) set is about 17.4 mag Link to GRB181008.88 page: https://master.sai.msu.ru/site/master2/ligo.php?af=1&wh=tabs(grbtime-'2018-10-08+21:04:32')%3C'1+minutes'::interval The message may be cited. The observations made on zenit distance = 69 deg.The moon ( 1 % bright part) below the horizon (The altitude of the Moon is -43 deg. ). The sun altitude is -36.1 deg. The object can be observed till 2018-10-10 01:57:56 MASTER-Tavrida robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was starting survey on the IPN GRB181008.88 error-box 32631 sec after notice time and 1 days 13876 sec after trigger time at 2018-10-10 00:55:48 UT. The 5-sigma upper limit on our first (180s exposure) set is about 17.9 mag The galactic latitude b = -60 deg., longitude l = 98 deg. The observations made on zenit distance = 74 deg.The moon ( 1 % bright part) below the horizon (The altitude of the Moon is -39 deg. ). The sun altitude is -31.3 deg. The object can be observed till 2018-10-10 02:32:31 MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Argentina (OAFA observatory of San Juan National University) was starting survey on the IPN GRB181008.88 error-box 1 days 33629 sec after trigger time at 2018-10-10 03:35:27 UT. The 5-sigma upper limit on our 3-th (180s exposure) set is about 17.6 mag Link to GRB181008.88 page: https://master.sai.msu.ru/site/master2/ligo.php?af=1&wh=tabs(grbtime-'2018-10-08+21:04:32')%3C'1+minutes'::interval The message may be cited. The galactic latitude b = -60 deg., longitude l = 98 deg. The observations made on zenit distance = 32 deg.The moon ( 1 % bright part) below the horizon (The altitude of the Moon is -44 deg. ). The sun altitude is -50.0 deg. The object can be observed till 2018-10-10 09:24:14 The total MASTER cover map is available at http://master.sai.msu.ru/static//IPN/db/GRB181008.88/img/ligo_master_2018-10-10-08-31-15.eb.zoom.1.png MASTER OT J075512.66-414512.0 detection - long variable star MASTER-SAAO auto-detection system ( Lipunov et al., "MASTER Global Robotic Net", Advances in Astronomy, 2010, 30L ) discovered OT source at (RA, Dec) = 07h 55m 12.66s -41d 45m 12.0s on 2018-10-09.99672 UT. The OT unfiltered magnitude is 12.2m (mlim=19.0). The OT is seen in 4 images. This OT was observed at MASTER-OAFA on 2017-09-23 08:08:47 with unfiltered m_OT=12.4. We have reference image on on 2015-01-11 21:25:04.129 UT with unfiltered m_OT=14.9m (MASTER-SAAO). The discovery and reference images are available at http://master.sai.msu.ru/static/OT/075512.66-414512.0.png This message can be cited.