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GCN Circular 38496

Subject
Fermi GRB 241209E: Global MASTER-Net observations report
Date
2024-12-09T19:15:54Z (a month ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V.Lipunov, E.Gorbovskoy, N.Tiurina,  P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov,  G.Antipov,  A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 

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) started inspect of the Fermi GRB 241209E ( Fermi GBM team, GCN 38495Loading...
 
 ) errorbox  142 sec after notice time and 177 sec after trigger time at 2024-12-09 18:29:40 UT, with upper limit up to  18.6 mag. Observations started at twilight.  The observations began at zenith distance = 47 deg. The sun  altitude  is -10.4 deg. 

The galactic latitude b = -37 deg., longitude l = 177 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2701531

We obtain a following upper limits.  

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

     207 | 2024-12-09 18:29:40 |         MASTER-SAAO | (02h 58m 04.37s , +06d 32m 47.4s) |   C |    60 | 17.1 |        
     377 | 2024-12-09 18:32:30 |         MASTER-SAAO | (03h 06m 07.86s , +06d 32m 04.1s) |   C |    60 | 17.5 |        
     456 | 2024-12-09 18:33:49 |         MASTER-SAAO | (03h 27m 25.63s , +02d 44m 45.4s) |   C |    60 | 17.3 |        
     630 | 2024-12-09 18:36:43 |         MASTER-SAAO | (03h 35m 23.18s , +02d 45m 36.0s) |   C |    60 | 17.3 |        
    1039 | 2024-12-09 18:43:32 |         MASTER-SAAO | (02h 58m 01.92s , +06d 33m 34.6s) |   C |    60 | 17.8 |        
    1209 | 2024-12-09 18:46:22 |         MASTER-SAAO | (03h 06m 08.99s , +06d 33m 54.4s) |   C |    60 | 18.0 |        
    1288 | 2024-12-09 18:47:41 |         MASTER-SAAO | (03h 27m 23.42s , +02d 45m 32.4s) |   C |    60 | 17.6 |        
    1460 | 2024-12-09 18:50:34 |         MASTER-SAAO | (03h 35m 29.15s , +02d 45m 45.1s) |   C |    60 | 17.6 |        
    1870 | 2024-12-09 18:57:23 |         MASTER-SAAO | (02h 58m 05.67s , +06d 34m 07.4s) |   C |    60 | 18.2 |        
    2039 | 2024-12-09 19:00:12 |         MASTER-SAAO | (03h 06m 01.95s , +06d 34m 27.1s) |   C |    60 | 18.4 |        
    2119 | 2024-12-09 19:01:33 |         MASTER-SAAO | (03h 27m 28.41s , +02d 45m 48.1s) |   C |    60 | 18.4 |        
    2292 | 2024-12-09 19:04:25 |         MASTER-SAAO | (03h 35m 29.42s , +02d 45m 08.6s) |   C |    60 | 18.6 |        
Filter C is a clear (unfiltred) band. 


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