{ "bibcode": "2021GCN.30562....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 GRB 210730A ( E. Sonbas et al., GCN 30548) errorbox 47961 sec after notice time and 47903 sec after trigger time at 2021-07-30 18:17:14 UT, with upper limit up to 19.2 mag. Observations started at twilight. The observations began at zenith distance = 54 deg. The sun altitude is -11.0 deg. \n\nMASTER-IAC robotic telescope located in Spain (IAC Teide Observatory) was pointed to the Swift GRB 210730A errorbox 64883 sec after notice time and 64826 sec after trigger time at 2021-07-30 22:59:17 UT, with upper limit up to 17.7 mag. The observations began at zenith distance = 76 deg. The sun altitude is -34.0 deg. \n\nMASTER-Kislovodsk robotic telescope located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) was pointed to the Swift GRB 210730A errorbox 71489 sec after notice time and 71432 sec after trigger time at 2021-07-31 00:49:22 UT, with upper limit up to 16.5 mag. Observations started at twilight. The observations began at zenith distance = 65 deg. The sun altitude is -11.7 deg. \n\nThe galactic latitude b = 41 deg., longitude l = 141 deg.\n\n\nReal time updated cover map and OT discovered available here: \nhttps://master.sai.msu.ru/site/master2/observ.php?id=1675497\n\nWe obtain a following upper limits. \n\nTmid-T0 | Site |Filt.| Expt. | Limit| Comment\n_________|_____________________|_____|_______|______|________\n\n 47934 | MASTER-Tavrida | C | 60 | 17.0 | \n 48488 | MASTER-Tavrida | C | 60 | 17.9 | \n 48962 | MASTER-Tavrida | C | 60 | 18.4 | \n 49437 | MASTER-Tavrida | C | 60 | 18.8 | \n 49912 | MASTER-Tavrida | C | 60 | 18.7 | \n 50386 | MASTER-Tavrida | C | 60 | 19.1 | \n 50684 | MASTER-Tavrida | C | 180 | 18.9 | \n 51671 | MASTER-Tavrida | C | 180 | 19.2 | \n 64916 | MASTER-IAC | C | 180 | 17.5 | \n 64916 | MASTER-IAC | C | 180 | 17.3 | \n 65096 | MASTER-IAC | C | 540 | 17.7 | Coadd \n 65131 | MASTER-IAC | C | 180 | 17.2 | \n 65131 | MASTER-IAC | C | 180 | 16.8 | \n 65311 | MASTER-IAC | C | 540 | 17.5 | Coadd \n 65341 | MASTER-IAC | C | 180 | 17.2 | \n 65341 | MASTER-IAC | C | 180 | 17.0 | \n 65551 | MASTER-IAC | C | 180 | 17.1 | \n 65551 | MASTER-IAC | C | 180 | 16.8 | \n 65760 | MASTER-IAC | C | 180 | 17.0 | \n 65760 | MASTER-IAC | C | 180 | 17.0 | \n 65970 | MASTER-IAC | C | 180 | 17.2 | \n 65970 | MASTER-IAC | C | 180 | 16.7 | \n 66179 | MASTER-IAC | C | 180 | 17.0 | \n 66179 | MASTER-IAC | C | 180 | 16.9 | \n 66394 | MASTER-IAC | C | 180 | 17.1 | \n 66394 | MASTER-IAC | C | 180 | 16.8 | \n 66604 | MASTER-IAC | C | 180 | 17.0 | \n 66604 | MASTER-IAC | C | 180 | 16.8 | \n 66815 | MASTER-IAC | C | 180 | 17.1 | \n 66815 | MASTER-IAC | C | 180 | 16.6 | \n 67023 | MASTER-IAC | C | 180 | 17.0 | \n 67023 | MASTER-IAC | C | 180 | 16.7 | \n 67238 | MASTER-IAC | C | 180 | 17.0 | \n 67238 | MASTER-IAC | C | 180 | 16.7 | \n 67565 | MASTER-IAC | C | 60 | 16.7 | \n 67834 | MASTER-IAC | C | 60 | 16.7 | \n 67834 | MASTER-IAC | C | 60 | 16.2 | \n 67923 | MASTER-IAC | C | 60 | 16.0 | \n 68440 | MASTER-IAC | C | 180 | 16.9 | \n 68440 | MASTER-IAC | C | 180 | 16.6 | \n 68770 | MASTER-IAC | C | 60 | 16.4 | \n 69041 | MASTER-IAC | C | 60 | 16.5 | \n 69041 | MASTER-IAC | C | 60 | 16.0 | \n 69130 | MASTER-IAC | C | 60 | 15.7 | \n 69636 | MASTER-IAC | C | 180 | 16.6 | \n 69636 | MASTER-IAC | C | 180 | 16.3 | \n 69964 | MASTER-IAC | C | 60 | 16.2 | \n 70235 | MASTER-IAC | C | 60 | 16.4 | \n 70235 | MASTER-IAC | C | 60 | 15.8 | \n 70323 | MASTER-IAC | C | 60 | 15.5 | \n 70835 | MASTER-IAC | C | 180 | 16.4 | \n 70835 | MASTER-IAC | C | 180 | 15.9 | \n 71522 | MASTER-Kislovodsk | C | 180 | 16.5 | \n 71722 | MASTER-Kislovodsk | C | 180 | 16.1 | \n 72000 | MASTER-IAC | C | 180 | 16.1 | \n 72000 | MASTER-IAC | C | 180 | 16.0 | \n 73190 | MASTER-IAC | C | 180 | 15.8 | \n 73190 | MASTER-IAC | 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": 30562, "createdOn": 1627707627000, "email": "lipunov@xray.sai.msu.ru", "subject": "Swift GRB 210730A: Global MASTER-Net observations report", "submitter": "Vladimir Lipunov at Moscow State U/Krylov Obs ", "eventId": "GRB 210730A" }