{
  "submittedHow": "email",
  "bibcode": "2025GCN.39395....1F",
  "editedOn": 1740150105855,
  "body": "C.Francile,  F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),\nV.Lipunov, E.Gorbovskoy, K.Zhirkov, N.Tiurina, P.Balanutsa, D.Vlasenko, I.Panchenko, A.Kuznetsov, G.Antipov, A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin, V.Senik, A.Chasovnikov, K.Labsina (Lomonosov MSU),\nO.Gress, N.Budnev(ISU),\nA. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),\nA. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)\nD.Buckley (SAAO),\nR.Rebolo (The Instituto de Astrofisica de Canarias),\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory)\n\nMASTER-OAFA robotic telescope (Global 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 pointed to the  GRB250221.15 60 sec after notice time and 93 sec after trigger time at 2025-02-21 03:36:10 UT. On our first (20s exposure)  set we  found 1 optical transient within Swift error-box (ra=59.475 dec=-15.1383 r=0.05) brighter than  18.4.\n\n\n T-Tmid      Date      Time       Expt.        Ra                Dec           Mag\n---------|---------------------|-------|-----------------|-----------------|-------\n     103   2025-02-21 03:36:10      20   (03h 57m 51.13s , -15d 08m 00.7s)     16.5\n\nThe 5-sigma upper limit has been about  18.4mag\nThe message may be cited.\n",
  "eventId": "GRB 250221.15",
  "subject": "Swift GRB250221.15: Global MASTER-Net OT detection",
  "createdOn": 1740109424775,
  "version": 2,
  "format": "text/plain",
  "circularId": 39395,
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "editedBy": "Judith Racusin at NASA/GSFC <judith.racusin@nasa.gov> on behalf of Vladimir Lipunov at Lomonosov Moscow State University <lipunov@sai.msu.ru>"
}