{
  "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-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB230818.98 (trigger No 1186032,19h 03m 31.90s , +40d 52m 34.7s, R=0.05) errorbox  19 sec after notice time and 37 sec after trigger time at 2023-08-18 23:28:11 UT, with upper limit up to  18.6 mag. The observations began at zenith distance = 48 deg. The sun  altitude  is -28.4 deg. \n\nMASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB230818.98 errorbox  24 sec after notice time and 41 sec after trigger time at 2023-08-18 23:28:15 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 54 deg. The sun  altitude  is -26.2 deg. \n\nThe galactic latitude b = 15 deg., longitude l = 72 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=2256038\n\nWe obtain a following upper limits.  \n\nTmid-T0  |          Site       |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n      42 |      MASTER-Tavrida |   C |    10 | 17.3 |        \n      47 |   MASTER-Kislovodsk |  P- |    10 | 14.2 |        \n      47 |   MASTER-Kislovodsk |  P| |    10 | 16.4 |        \n      57 |   MASTER-Kislovodsk |  P| |    30 | 17.1 |  Coadd \n      59 |      MASTER-Tavrida |   C |    10 | 17.9 |        \n      65 |   MASTER-Kislovodsk |  P- |    10 | 14.2 |        \n      65 |   MASTER-Kislovodsk |  P| |    10 | 16.5 |        \n      76 |      MASTER-Tavrida |   C |    10 | 18.0 |        \n      83 |   MASTER-Kislovodsk |  P- |    10 | 14.5 |        \n      83 |   MASTER-Kislovodsk |  P| |    10 | 16.5 |        \n      99 |      MASTER-Tavrida |   C |    20 | 18.3 |        \n     105 |   MASTER-Kislovodsk |  P- |    20 | 16.0 |        \n     105 |   MASTER-Kislovodsk |  P| |    20 | 17.2 |        \n     130 |   MASTER-Kislovodsk |  P| |    70 | 17.8 |  Coadd \n     126 |      MASTER-Tavrida |   C |    20 | 18.3 |        \n     134 |   MASTER-Kislovodsk |  P- |    20 | 16.0 |        \n     134 |   MASTER-Kislovodsk |  P| |    20 | 17.0 |        \n     159 |      MASTER-Tavrida |   C |    30 | 18.4 |        \n     167 |   MASTER-Kislovodsk |  P- |    30 | 16.1 |        \n     167 |   MASTER-Kislovodsk |  P| |    30 | 17.5 |        \n     201 |      MASTER-Tavrida |   C |    40 | 18.6 |        \n     210 |   MASTER-Kislovodsk |  P- |    40 | 16.1 |        \n     210 |   MASTER-Kislovodsk |  P| |    40 | 17.7 |        \n     253 |      MASTER-Tavrida |   C |    50 | 18.6 |        \n     263 |   MASTER-Kislovodsk |  P- |    50 | 16.2 |        \n     263 |   MASTER-Kislovodsk |  P| |    50 | 17.8 |        \n     326 |   MASTER-Kislovodsk |  P- |    60 | 16.2 |        \n     326 |   MASTER-Kislovodsk |  P| |    60 | 17.9 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.\n\n",
  "eventId": "GRB 230818.98",
  "subject": "Swift GRB230818.98: Global MASTER-Net observations report",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>",
  "circularId": 34477,
  "createdOn": 1692401785971,
  "bibcode": "2023GCN.34477....1L",
  "submittedHow": "email-legacy"
}