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GCN Circular 36224

Subject
Fermi GRB 240422A: Global MASTER-Net observations report
Date
2024-04-22T05:31:57Z (3 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 240422A ( Fermi GBM team, GCN 36222) errorbox  2591 sec after notice time and 2626 sec after trigger time at 2024-04-22 03:24:46 UT, with upper limit up to  19.3 mag. The observations began at zenith distance = 45 deg. The sun  altitude  is -21.7 deg. 

The galactic latitude b = -16 deg., longitude l = 324 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2430987

We obtain a following upper limits.  

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

    2657 | 2024-04-22 03:24:46 |         MASTER-SAAO | (18h 35m 02.79s , -76d 43m 27.3s) |   C |    60 | 19.1 |        
    3878 | 2024-04-22 03:45:07 |         MASTER-SAAO | (18h 35m 34.85s , -76d 42m 39.4s) |   C |    60 | 18.0 |        
    4038 | 2024-04-22 03:47:47 |         MASTER-SAAO | (16h 59m 17.39s , -67d 19m 40.0s) |   C |    60 | 18.8 |        
    4038 | 2024-04-22 03:47:47 |         MASTER-SAAO | (16h 54m 35.38s , -67d 06m 21.1s) |   C |    60 | 19.1 |        
    4118 | 2024-04-22 03:49:07 |         MASTER-SAAO | (16h 57m 08.53s , -68d 58m 52.2s) |   C |    60 | 19.3 |        
    4118 | 2024-04-22 03:49:07 |         MASTER-SAAO | (17h 02m 14.07s , -69d 12m 12.4s) |   C |    60 | 19.1 |        
    4198 | 2024-04-22 03:50:27 |         MASTER-SAAO | (16h 53m 26.59s , -65d 11m 30.9s) |   C |    60 | 19.1 |        
    4198 | 2024-04-22 03:50:27 |         MASTER-SAAO | (16h 57m 48.08s , -65d 24m 47.4s) |   C |    60 | 18.9 |        
    4277 | 2024-04-22 03:51:46 |         MASTER-SAAO | (17h 33m 33.47s , -67d 07m 02.3s) |   C |    60 | 19.4 |        
Filter C is a clear (unfiltred) band. 


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


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