//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30904 SUBJECT: Swift GRB211001.03: Global MASTER-Net OT detection DATE: 21/10/01 00:50:48 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory MASTER-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 GRB211001.03 27 sec after notice time and 41 sec after trigger time at 2021-10-01 00:44:01 UT. On our 3-th (20s exposure) set , obtained 100 sec after tigger time at 2021-10-01 00:44:59 UT, we found 1 optical transient within Swift error-box (ra=71.4667 dec=12.0397 r=0.05) brighter than 14.6. T-Tmid Date Time Expt. Ra Dec Mag ---------|---------------------|-------|-----------------|-----------------|------- 110 2021-10-01 00:44:59 20 (04h 46m 00.28s , +12d 02m 15.1s) 14.2 The 5-sigma upper limit has been about 14.6mag The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30906 SUBJECT: Swift GRB211001.03: Global MASTER-Net observations report DATE: 21/10/01 01:58:35 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (Lomonosov Moscow State University, SAI, Physics Department), R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), D. Buckley (South African Astronomical Observatory), O.A. Gres, N.M. Budnev, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (Blagoveschensk Educational State University) MASTER-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 GRB211001.03 (trigger No 1076121,04h 45m 52.80s , +12d 02m 24.0s, R=0.05) errorbox 41 sec after trigger time at 2021-10-01 00:44:01 UT, with upper limit up to 19.1 mag. The observations began at zenith distance = 35 deg. The sun altitude is -31.3 deg. The galactic latitude b = -20 deg., longitude l = 187 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1738591 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 47 | MASTER-Tavrida | P\ | 10 | 14.7 | 76 | MASTER-Tavrida | P\ | 10 | 14.8 | 110 | MASTER-Tavrida | P\ | 20 | 15.1 | 154 | MASTER-Tavrida | P\ | 30 | 14.8 | 209 | MASTER-Tavrida | P\ | 40 | 15.2 | 273 | MASTER-Tavrida | P\ | 50 | 15.8 | 347 | MASTER-Tavrida | P\ | 60 | 15.9 | 436 | MASTER-Tavrida | P\ | 80 | 15.9 | 545 | MASTER-Tavrida | P\ | 100 | 15.9 | 674 | MASTER-Tavrida | P\ | 120 | 16.0 | 1099 | MASTER-Tavrida | C | 180 | 18.4 | 1298 | MASTER-Tavrida | C | 180 | 18.5 | 1566 | MASTER-Tavrida | C | 180 | 18.6 | 1765 | MASTER-Tavrida | C | 180 | 18.7 | 1964 | MASTER-Tavrida | C | 180 | 18.8 | 2163 | MASTER-Tavrida | C | 180 | 18.9 | 2362 | MASTER-Tavrida | C | 180 | 18.9 | 2561 | MASTER-Tavrida | C | 180 | 19.0 | 2760 | MASTER-Tavrida | C | 180 | 19.1 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 30911 SUBJECT: Swift GRB211001.03 / trigger 1076121 : MASTER OT retraction DATE: 21/10/01 07:42:35 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs E. Gorbovskoy, V.Lipunov MASTER optical candidate to transients sources from GCN 30904 is not astrophysical.