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GCN Circular 35825

Subject
Fermi GRB 240227A: Global MASTER-Net observations report
Date
2024-02-28T04:30:39Z (9 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik,  D. Vlasenko,
G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij
(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. Gress, N.M. Budnev, O.Ershova
(Irkutsk State University, API),

L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez
(INAOE, Guillermo Haro Astrophysics Observatory),

A. Tlatov, D. Dormidontov
(Kislovodsk Solar Station of the Pulkovo Observatory),

V. Yurkov, A. Gabovich
(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) started inspect of the Fermi GRB 240227A ( Fermi GBM team, GCN 35814Not found
 
 
) errorbox  48100 sec after notice time and 48133 sec after trigger time at 2024-02-27 18:02:28 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 32 deg. The sun  altitude  is -10.2 deg. 

The galactic latitude b = -39 deg., longitude l = 271 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2387115

We obtain a following upper limits.  

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

   48163 | 2024-02-27 18:02:28 |         MASTER-SAAO | (04h 37m 02.73s , -61d 29m 49.8s) |   C |    60 | 17.6 |        
   48163 | 2024-02-27 18:02:28 |         MASTER-SAAO | (04h 55m 01.13s , -61d 40m 45.7s) |   C |    60 | 17.3 |        
   48243 | 2024-02-27 18:03:47 |         MASTER-SAAO | (04h 21m 16.28s , -59d 36m 59.5s) |   C |    60 | 17.8 |        
   48243 | 2024-02-27 18:03:47 |         MASTER-SAAO | (04h 38m 13.45s , -59d 47m 57.1s) |   C |    60 | 17.4 |        
   48322 | 2024-02-27 18:05:07 |         MASTER-SAAO | (04h 21m 36.67s , -63d 25m 43.7s) |   C |    60 | 18.0 |        
   48322 | 2024-02-27 18:05:07 |         MASTER-SAAO | (04h 40m 47.01s , -63d 36m 37.9s) |   C |    60 | 17.7 |        
Filter C is a clear (unfiltred) band. 


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