{
  "bibcode": "2018GCN.22428....1G",
  "body": "E.Gorbovskoy, V. Lipunov, N.Tyurina, V.Kornilov, D.Zimnukhov, V.Vladimirov, \nA.Krylov, I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.Chazov, D. Kuvshinov\n(Lomonosov Moscow State University, SAI),\n\nR.Podesta, C.Lopez, F. Podesta\n(Observatorio Astronomico Felix Aguilar (OAFA),National University of San Juan, \nArgentina),\n\nH. Levato, C. Saffe\n(Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE), San \nJuan, Argentina),\n\nD.Buckley, S. Potter\n(South African Astronomical Observatory),\n\nR. Rebolo, M. Serra\n(The Instituto de Astrofisica de Canarias),\n\nO.Gres,  N.M.Budnev\n(Irkutsk State University),\n\nA. Tlatov, V.Senik, D. Dormidontov\n(Kislovodsk Solar Station of the Pulkovo Observatory)\n\nV.Yurkov, A.Gabovich, Yu.Sergienko\n(Blagoveschensk Educational State University, Blagoveschensk),\n\n\nMASTER-OAFA  robotic telescope (MASTER-Net: http://observ.pereplet.ru) located \nin Argentina was pointed to the Swift possible GRB 180221A (Stamatikos et al GCN 22427)\n  119 sec after notice time and 257 sec after trigger time at 2018-02-21 06:35:01 UT.\nOn our first (50s exposure)  set we didn't find optical transient  within \nSWIFT-BAT error-box (RA, Dec 326.772, -72.868, radius 3arcmin).\n\nThe 5-sigma upper limit has been about 18.3  mag at single (50 sec) and \n19.5  at coadd (310 sec) images.\n\nThe message may be cited.\n\n====================================================================\nThe observations were made on\nzenit distance 73 degrees,\nThe Sun  altitude  is -40.6 degree.\nDist. to Moon: 92.17 (Moon coord. 35.522966 d, 8.630816 d)",
  "circularId": 22428,
  "createdOn": 1519199848000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "GRB180221A: MASTER-OAFA optical observations",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 180221A"
}