TITLE: GCN CIRCULAR NUMBER: 18058 SUBJECT: Swift IGR J00291+5934: MASTER Optical flare detection DATE: 15/07/24 16:46:47 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs ---------- Forwarded message ---------- Date: Fri, 24 Jul 2015 19:44:33 +0300 (MSK) From: Lipunov V.M. To: gcncirc@capella.gsfc.nasa.gov Subject: IGR J00291+5934: Optical flare detection R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias V. Lipunov, E. Gorbovskoy, N.Tyurina, V.Kornilov, P.Balanutsa,A.Kuznetsov,D.Kuvshinov, Lomonosov Moscow State University, Sternberg Astronomical Institute D.Buckley, S. Potter, A.Kniazev, M.Kotze South African Astronomical Observatory A. Tlatov, A.V. Parhomenko, D. Dormidontov, V.Sennik Kislovodsk Solar Station of the Pulkovo Observatory K.Ivanov, O.Gres, N.M.Budnev, S.Yazev, O.Chuvalaev, V.A.Poleshchuk Irkutsk State University V.Yurkov, Yu.Sergienko, D.Varda, E.Sinyakov, A.Gabovich Blagoveschensk Educational State University, Blagoveschensk V.Krushinski, I.Zalozhnih Ural Federal University, Kourovka Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) Claudio Mallamaci, Carlos Lopez and Federico Podest Observatorio Astronomico Felix Aguilar (OAFA) MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in IAC was pointed to the IGR J00291+5934 (Cummings et al., GCN 18051) 24 sec after notice time and 1103 sec after trigger time at 2015-07-24 05:42:03 UT. On our first (180s exposure) set we haven`t found optical transient within SWIFT error-box. The 5-sigma upper limit has been about 17.2 mag MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Tunka was pointed to the IGR J00291+5934 Swift Trigger 35223 sec after notice time and 36279 sec after trigger time at 2015-07-24 15:28:16 UT. On our first (180s exposure) set we found 1 optical transient within Swift error-box ~ 17.5 unfileterd mag (CCD is red, m=0.2B+0.8R with respect to USNO B ). The 5-sigma upper limit has been about 19.4 mag . The message may be cited.