GRB 241029A: MASTER early optical counterpart detection

MASTER Global robotic net (http://observ.pereplet.ru Lipunov et al.,2010,Advances in Astronomy,2010,30L) started observation of Fermi GRB 241029A (GCN 37932, Ttrigger=02:19:59 UT) at MASTER-OAFA (Lipunov et al. GCN 37933, cover map https://master.sai.msu.ru/site/master2/observ.php?id=2652352 ) 66 sec after notice time (101 sec after trigger time) at 2024-10-29 02:21:41 UT. At first images (20s expositions) MASTER auto-detection system detected optical transient MASTER OT J214120.16+050453.4 at (RA, Dec) = 21h 41m 20.16s +05d 04m 53.4s on 2024-10-29.09839 UT. The OT magnitude (unfiltered) is ~13.4m (mlim=16.8). OT automatic light curve http://observ.pereplet.ru/GRB/MASTERGRB241029A_LC.jpg The OT is seen in 6 images. There is no minor planet at this place. We have reference image on 2017-05-29.35167 UT with unfiltered 18.3m. This OT was first publishied by Jiang et al. (GCN 37937, started at 09:49:01 UTC with m_OT=20.0 in R ) and continued by Weikang Lin et al. (GCN 37939), Jiang et al. GCN 37940. Observations in MASTER-Tunka and other MASTER Global Robotic Net telescopess will be continued.