TITLE: GCN CIRCULAR NUMBER: 22428 SUBJECT: GRB180221A: MASTER-OAFA optical observations DATE: 18/02/21 07:57:28 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E.Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov, D.Zimnukhov, V.Vladimirov, A.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.Chazov, D. Kuvshinov (Lomonosov Moscow State University, SAI), R.Podesta, C.Lopez, F. Podesta (Observatorio Astronomico Felix Aguilar (OAFA),National University of San Juan, Argentina), H. Levato, C. Saffe (Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE), San Juan, Argentina), D.Buckley, S. Potter (South African Astronomical Observatory), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), O.Gres, N.M.Budnev (Irkutsk State University), A. Tlatov, V.Senik, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory) V.Yurkov, A.Gabovich, Yu.Sergienko (Blagoveschensk Educational State University, Blagoveschensk), MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru) located in Argentina was pointed to the Swift possible GRB 180221A (Stamatikos et al GCN 22427) 119 sec after notice time and 257 sec after trigger time at 2018-02-21 06:35:01 UT. On our first (50s exposure) set we didn't find optical transient within SWIFT-BAT error-box (RA, Dec 326.772, -72.868, radius 3arcmin). The 5-sigma upper limit has been about 18.3 mag at single (50 sec) and 19.5 at coadd (310 sec) images. The message may be cited. ==================================================================== The observations were made on zenit distance 73 degrees, The Sun altitude is -40.6 degree. Dist. to Moon: 92.17 (Moon coord. 35.522966 d, 8.630816 d)