TITLE: GCN CIRCULAR NUMBER: 30741 SUBJECT: Integral GRB210829.17: Global MASTER-Net observations report DATE: 21/08/29 04:19:08 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs lipunov@xray.sai.msu.ru

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-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) was pointed to the Integral GRB210829.17 (trigger No 9367,05h 41m 05.78s , +24d 44m 14.7s, R=0.0503333) errorbox 138 sec after notice time and 149 sec after trigger time at 2021-08-29 04:11:07 UT, with upper limit up to 16.7 mag. Observations started at twilight. The observations began at zenith distance = 61 deg. The sun altitude is -11.0 deg.

The galactic latitude b = -2 deg., longitude l = 183 deg.

Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1703493

We obtain a following upper limits.

Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________

164 | MASTER-SAAO | P\ | 30 | 16.0 | 209 | MASTER-SAAO | P\ | 120 | 16.7 | Coadd 211 | MASTER-SAAO | P\ | 40 | 16.0 | 268 | MASTER-SAAO | P\ | 50 | 16.0 | 336 | MASTER-SAAO | P\ | 60 | 16.1 | 418 | MASTER-SAAO | P\ | 80 | 16.0 |

The observation and reduction will continue. The message may be cited.