{
  "bibcode": "2021GCN.30762....1L",
  "body": "V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, \nV.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva,\nD.Kuvshinov,  D. Cheryasov\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, O.Ershova \n(Irkutsk State University, API),\n\nA. Tlatov, D. Dormidontov \n(Kislovodsk Solar Station of the Pulkovo Observatory),\n\nV. Yurkov, A. Gabovich, Yu. Sergienko \n(Blagoveschensk Educational State University)\n\n\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 GRB210903.59 (trigger No 1071768,19h 58m 08.69s , +34d 58m 31.8s, R=0.0013) errorbox  10573 sec after notice time and 10763 sec after trigger time at 2021-09-03 17:06:18 UT, with upper limit up to  18.4 mag. Observations started at twilight.  The observations began at zenith distance = 21 deg. The sun  altitude  is -9.6 deg. \n\nMASTER-Kislovodsk robotic telescope  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB210903.59 errorbox  17837 sec after notice time and 18026 sec after trigger time at 2021-09-03 19:07:21 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 13 deg. The sun  altitude  is -32.4 deg. \n\nMASTER-OAFA robotic telescope  located in Argentina (OAFA observatory of San Juan National University) was pointed to the Swift GRB210903.59 errorbox  34110 sec after notice time and 34300 sec after trigger time at 2021-09-03 23:38:35 UT, with upper limit up to  16.6 mag. The observations began at zenith distance = 72 deg. The sun  altitude  is -17.6 deg. \n\nThe galactic latitude b =  3 deg., longitude l = 71 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=1708701\n\nWe obtain a following upper limits.  \n\nTmid-T0  |          Site       |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n   10854 |      MASTER-Tavrida |   C |   180 | 16.0 |        \n   11468 |      MASTER-Tavrida |   C |   180 | 17.4 |        \n   12664 |      MASTER-Tavrida |   C |   180 | 17.9 |        \n   14017 |      MASTER-Tavrida |   C |   180 | 18.0 |        \n   14475 |      MASTER-Tavrida |   C |   180 | 18.2 |        \n   16334 |      MASTER-Tavrida |   C |   180 | 16.6 |        \n   18117 |   MASTER-Kislovodsk |   C |   180 | 16.8 |        \n   18117 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        \n   18263 |      MASTER-Tavrida |   C |   180 | 18.2 |        \n   20001 |   MASTER-Kislovodsk |   C |   180 | 18.0 |        \n   20001 |   MASTER-Kislovodsk |   C |   180 | 17.7 |        \n   20140 |      MASTER-Tavrida |   C |   180 | 18.4 |        \n   21805 |   MASTER-Kislovodsk |   C |   180 | 17.7 |        \n   21805 |   MASTER-Kislovodsk |   C |   180 | 18.0 |        \n   22143 |      MASTER-Tavrida |   C |   180 | 17.1 |        \n   23689 |   MASTER-Kislovodsk |   C |   180 | 17.5 |        \n   23689 |   MASTER-Kislovodsk |   C |   180 | 17.8 |        \n   24010 |      MASTER-Tavrida |   C |   180 | 18.2 |        \n   25493 |   MASTER-Kislovodsk |   C |   180 | 17.2 |        \n   25494 |   MASTER-Kislovodsk |   C |   180 | 17.6 |        \n   25959 |      MASTER-Tavrida |   C |   180 | 18.2 |        \n   27299 |   MASTER-Kislovodsk |   C |   180 | 16.6 |        \n   27299 |   MASTER-Kislovodsk |   C |   180 | 17.4 |        \n   27952 |      MASTER-Tavrida |   C |   180 | 18.1 |        \n   29103 |   MASTER-Kislovodsk |   C |   180 | 16.0 |        \n   29103 |   MASTER-Kislovodsk |   C |   180 | 17.0 |        \n   29947 |      MASTER-Tavrida |   C |   180 | 18.1 |        \n   31940 |      MASTER-Tavrida |   C |   180 | 18.2 |        \n   33748 |      MASTER-Tavrida |   C |   180 | 17.8 |        \n   34390 |         MASTER-OAFA |   C |   180 | 16.0 |        \n   35611 |      MASTER-Tavrida |   C |   180 | 17.6 |        \n   36466 |         MASTER-OAFA |   C |   180 | 16.5 |        \n   37511 |      MASTER-Tavrida |   C |   180 | 17.9 |        \n   37844 |   MASTER-Kislovodsk |   C |   180 | 12.6 |        \n   38341 |         MASTER-OAFA |   C |   180 | 16.6 |        \n   39331 |      MASTER-Tavrida |   C |   180 | 17.2 |        \n   40219 |         MASTER-OAFA |   C |   180 | 16.6 |        \n   41730 |      MASTER-Tavrida |   C |   180 | 17.2 |        \n   42215 |         MASTER-OAFA |   C |   180 | 16.4 |        \n   51950 |         MASTER-OAFA |   C |   180 | 15.9 |        \nFilter C is a clear (unfiltred) band. \n\n\nThe observation and reduction will continue. \nThe message may be cited.",
  "circularId": 30762,
  "createdOn": 1630764368000,
  "email": "lipunov@xray.sai.msu.ru",
  "subject": "Swift GRB210903.59: Global MASTER-Net observations report",
  "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov@xray.sai.msu.ru>",
  "eventId": "GRB 210903.59"
}