TITLE: GCN CIRCULAR NUMBER: 23411 SUBJECT: Fermi GRB 181105.31: Global MASTER Net optical observations DATE: 18/11/06 13:17:47 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, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk 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 D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory MASTER-Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Applied Physics Institute, Irkutsk State University) was starting survey on the FERMI GRB181105.31 error-box (ra=21 12 52 dec=+78 31 00 r=4.88) 11567 sec after notice time and 11611 sec after trigger time at 2018-11-05 10:46:46 UT. The 5-sigma upper limit on our first (60s exposure) set is about 17.1mag The OT candidate available here https://90.188.52.90:20103//master2/trans.php?wh=transients.coord2000@%27%3C%28318.217d%2C78.5167d%29%2C12.76d%3E%27%3A%3Ascircle+and+transients.datetime%3E%3D%272018-11-05+07%3A33%3A15%27&class=9&t2=FERMI+GRB181105.31+optical+counterpart+candidate The full information about this GRB181105.31 available here https://90.188.52.90:20103//master2/grb.php?not=2018-11-05+07%3A33%3A59.700222&sat=FERMI&gcrd=%28318.217d%2C78.5167d%29&eb=4.88&trig=2018-11-05+07%3A33%3A15&n=GRB181105.31 The message may be cited. ==================================================================== The galactic latitude b = 20 deg., longitude l = 113 deg. The observations made on zenit distance = 27 deg.The moon ( 6 % bright part) below the horizon (The altitude of the Moon is -16 deg. ). Observations started at twilight. The sun altitude is -11.7 deg. The object can be observed till sunrise at 2018-11-05 00:11:25 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 FERMI GRB181105.31 error-box (ra=21 12 52 dec=+78 30 59 r=4.8833) 30182 sec after notice time and 30236 sec after trigger time at 2018-11-05 15:57:12 UT. The 5-sigma upper limit on our first (60s exposure) set is about 18.36mag The OT candidate available here https://195.20.29.135:1243/master2/trans.php?wh=transients.coord2000@%27%3C%28318.217d%2C78.5164d%29%2C12.7666d%3E%27%3A%3Ascircle+and+transients.datetime%3E%3D%272018-11-05+07%3A33%3A15.63%27&class=9&t2=FERMI+GRB181105.31+optical+counterpart+candidate The full information about this GRB181105.31 available here https://195.20.29.135:1243/master2/grb.php?not=2018-11-05+07%3A34%3A10.309105&sat=FERMI&gcrd=%28318.217d%2C78.5164d%29&eb=4.8833&trig=2018-11-05+07%3A33%3A15.63&n=GRB181105.31 The message may be cited. ==================================================================== The galactic latitude b = 20 deg., longitude l = 113 deg. The observations made on zenit distance = 34 deg.The moon ( 5 % bright part) below the horizon (The altitude of the Moon is -23 deg. ). Observations started at twilight. The sun altitude is -16.4 deg. The object can be observed till sunrise at 2018-11-06 04:25:45 . 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 FERMI GRB181105.31 error-box (ra=21 12 52 dec=+78 30 59 r=4.8833) 33733 sec after notice time and 33787 sec after trigger time at 2018-11-05 16:56:23 UT. The 5-sigma upper limit on our first (60s exposure) set is about 19.03mag The OT candidate available here https://37.29.115.162//master2/trans.php?wh=transients.coord2000@%27%3C%28318.217d%2C78.5164d%29%2C12.7666d%3E%27%3A%3Ascircle+and+transients.datetime%3E%3D%272018-11-05+07%3A33%3A15.63%27&class=9&t2=FERMI+GRB181105.31+optical+counterpart+candidate The full information about this GRB181105.31 available here https://37.29.115.162//master2/grb.php?not=2018-11-05+07%3A34%3A10.309105&sat=FERMI&gcrd=%28318.217d%2C78.5164d%29&eb=4.8833&trig=2018-11-05+07%3A33%3A15.63&n=GRB181105.31 The message may be cited. ==================================================================== The galactic latitude b = 20 deg., longitude l = 113 deg. The observations made on zenit distance = 36 deg.The moon ( 5 % bright part) below the horizon (The altitude of the Moon is -37 deg. ). The sun altitude is -33.2 deg. The object can be observed till sunrise at 2018-11-06 03:49:15 MASTER-IAC robotic telescope (MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was starting survey on the FERMI GRB181105.31 error-box (ra=21 12 52 dec=+78 30 59 r=4.8833) 44407 sec after notice time and 44462 sec after trigger time at 2018-11-05 19:54:17 UT. The 5-sigma upper limit on our first (60s exposure) set is about 18.5mag The OT candidate available here https://161.72.133.2//master2/trans.php?wh=transients.coord2000@%27%3C%28318.217d%2C78.5164d%29%2C12.7666d%3E%27%3A%3Ascircle+and+transients.datetime%3E%3D%272018-11-05+07%3A33%3A15.63%27&class=9&t2=FERMI+GRB181105.31+optical+counterpart+candidate The full information about this GRB181105.31 available here https://161.72.133.2//master2/grb.php?not=2018-11-05+07%3A34%3A10.309105&sat=FERMI&gcrd=%28318.217d%2C78.5164d%29&eb=4.8833&trig=2018-11-05+07%3A33%3A15.63&n=GRB181105.31 The message may be cited. ==================================================================== The galactic latitude b = 20 deg., longitude l = 113 deg. The observations made on zenit distance = 50 deg.The moon ( 4 % bright part) below the horizon (The altitude of the Moon is -34 deg. ). The sun altitude is -21.6 deg. The object can be observed till sunrise at 2018-11-06 07:19:00 . The cover map is available at http://master.sai.msu.ru/static/MASTER_GRB181105.31.png One possible short OT candidate not connected with GRB was found: MASTER OT J203829.37+811113.7 MASTER-Tunka auto-detection system discovered OT source at (RA, Dec) = 20h 38m 29.37s +81d 11m 13.7s on 2018-11-05.47844 UT. The OT unfiltered magnitude is 16.0m (limit 17.7m). The OT is seen in 1 image. There is no minor planet at this place. We have reference image without OT on 2011-08-15.62329 UT with unfiltered magnitude limit 19.2m. Discovery and references images are available at htttp://www.pereplet.ru/lipunov/images/203829.37811113.7.png This message can be cited.