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GCN Circular 38696

Subject
Fermi GRB 241228B: Global MASTER-Net observations report
Date
2024-12-28T21:30:39Z (11 days ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
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 241228B ( Fermi GBM team, GCN 38682Loading...
 
 ) errorbox  55483 sec after notice time and 55523 sec after trigger time at 2024-12-28 19:38:28 UT, with upper limit up to  19.0 mag. The observations began at zenith distance = 78 deg. The sun  altitude  is -19.7 deg. 

The galactic latitude b = 24 deg., longitude l = 209 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2724467

We obtain a following upper limits.  

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

   55553 | 2024-12-28 19:38:28 |         MASTER-SAAO | (07h 54m 54.88s , +12d 40m 09.5s) |   C |    60 | 18.1 |        
   56070 | 2024-12-28 19:47:05 |         MASTER-SAAO | (08h 03m 04.96s , +12d 39m 30.2s) |   C |    60 | 16.7 |        
   56692 | 2024-12-28 19:57:27 |         MASTER-SAAO | (07h 54m 52.81s , +12d 39m 26.0s) |   C |    60 | 18.0 |        
   56772 | 2024-12-28 19:58:46 |         MASTER-SAAO | (08h 03m 04.32s , +12d 40m 43.1s) |   C |    60 | 16.5 |        
   58004 | 2024-12-28 20:19:19 |         MASTER-SAAO | (07h 54m 54.92s , +12d 40m 11.9s) |   C |    60 | 18.3 |        
   58084 | 2024-12-28 20:20:39 |         MASTER-SAAO | (08h 03m 07.28s , +12d 39m 10.9s) |   C |    60 | 17.8 |        
   58882 | 2024-12-28 20:33:57 |         MASTER-SAAO | (07h 54m 51.05s , +12d 39m 25.5s) |   C |    60 | 18.5 |        
   58961 | 2024-12-28 20:35:16 |         MASTER-SAAO | (08h 03m 04.08s , +12d 40m 44.1s) |   C |    60 | 18.3 |        
   59580 | 2024-12-28 20:45:35 |         MASTER-SAAO | (07h 54m 50.78s , +12d 40m 28.4s) |   C |    60 | 18.5 |        
   59660 | 2024-12-28 20:46:55 |         MASTER-SAAO | (08h 03m 10.24s , +12d 39m 46.4s) |   C |    60 | 18.8 |        
   60280 | 2024-12-28 20:57:15 |         MASTER-SAAO | (07h 54m 57.16s , +12d 39m 31.6s) |   C |    60 | 18.8 |        
   60359 | 2024-12-28 20:58:34 |         MASTER-SAAO | (08h 03m 02.92s , +12d 38m 48.5s) |   C |    60 | 18.8 |        
   60438 | 2024-12-28 20:59:53 |         MASTER-SAAO | (07h 58m 43.86s , +14d 32m 58.5s) |   C |    60 | 18.9 |        
   60523 | 2024-12-28 21:01:18 |         MASTER-SAAO | (08h 07m 02.39s , +14d 34m 55.5s) |   C |    60 | 18.8 |        
   60604 | 2024-12-28 21:02:39 |         MASTER-SAAO | (08h 03m 12.94s , +16d 27m 55.2s) |   C |    60 | 18.8 |        
   60683 | 2024-12-28 21:03:58 |         MASTER-SAAO | (08h 11m 26.65s , +16d 27m 10.6s) |   C |    60 | 18.7 |        
   60762 | 2024-12-28 21:05:17 |         MASTER-SAAO | (08h 10m 29.63s , +12d 39m 19.4s) |   C |    60 | 18.9 |        
   60841 | 2024-12-28 21:06:36 |         MASTER-SAAO | (08h 18m 45.35s , +12d 40m 59.7s) |   C |    60 | 18.8 |        
   60921 | 2024-12-28 21:07:56 |         MASTER-SAAO | (08h 14m 28.98s , +14d 34m 17.4s) |   C |    60 | 18.7 |        
   61000 | 2024-12-28 21:09:15 |         MASTER-SAAO | (08h 22m 39.46s , +14d 33m 30.7s) |   C |    60 | 18.8 |        
   61079 | 2024-12-28 21:10:34 |         MASTER-SAAO | (07h 58m 46.86s , +14d 33m 13.5s) |   C |    60 | 18.9 |        
   61159 | 2024-12-28 21:11:53 |         MASTER-SAAO | (08h 06m 59.82s , +14d 34m 45.5s) |   C |    60 | 18.9 |        
   61238 | 2024-12-28 21:13:13 |         MASTER-SAAO | (08h 03m 09.07s , +16d 27m 01.5s) |   C |    60 | 18.9 |        
   61317 | 2024-12-28 21:14:32 |         MASTER-SAAO | (08h 11m 31.76s , +16d 29m 13.2s) |   C |    60 | 18.9 |        
   61397 | 2024-12-28 21:15:52 |         MASTER-SAAO | (08h 10m 27.01s , +12d 40m 12.9s) |   C |    60 | 19.0 |        
Filter C is a clear (unfiltred) band. 


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