{
  "bibcode": "2023GCN.33347....1L",
  "body": "V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, \nG.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin\n(Lomonosov Moscow State University, SAI, Physics Department),\n\nR. Podesta, C.Lopez, F. Podesta, C.Francile \n(Observatorio Astronomico Felix Aguilar OAFA),\n\nR. Rebolo, M. Serra \n(The Instituto de Astrofisica de Canarias),\n\nD. Buckley \n(South African Astronomical Observatory),\n\nO.A. Gres, N.M. Budnev\n(Irkutsk State University, API),\n\nL.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez \n(INAOE, Guillermo Haro Astrophysics Observatory),\n\nA. Tlatov, D. Dormidontov \n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nA. Gabovich, V.Yurkov \n(Blagoveschensk Educational State University)\n\n\nMASTER-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB230218.66 (trigger No 698427992,02h 38m 19.20s , +55d 06m 00.0s, R=16.02) errorbox  10024 sec after notice time and 10058 sec after trigger time at 2023-02-18 18:34:06 UT, with upper limit up to  17.8 mag. Observations started at twilight.  The observations began at zenith distance = 79 deg. The sun  altitude  is -14.4 deg. \n\nThe galactic latitude b = -4 deg., longitude l = 138 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=2200066\n\nWe obtain a following upper limits.  \n\nTmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____________________|____________________________________|_____|_______|_______|________\n\n   10089 | 2023-02-18 18:34:06 |         MASTER-SAAO | (03h 35m 28.72s , +41d 02m 43.9s) |   C |    60 | 17.5 |        \n   10089 | 2023-02-18 18:34:06 |         MASTER-SAAO | (03h 36m 33.25s , +41d 02m 39.7s) |   C |    60 | 17.8 |        \n   10397 | 2023-02-18 18:39:14 |         MASTER-SAAO | (03h 46m 09.82s , +41d 02m 49.4s) |   C |    60 | 17.8 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.",
  "circularId": 33347,
  "createdOn": 1676790018000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "Fermi  trigger No 698427992: Global MASTER-Net observations report",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>"
}