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GCN Circular 36552

Subject
Fermi GRB 240527A: Global MASTER-Net observations report
Date
2024-05-28T00:15:43Z (2 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 240527A ( Fermi GBM team, GCN 36544) errorbox  54107 sec after notice time and 54125 sec after trigger time at 2024-05-27 22:09:31 UT, with upper limit up to  17.4 mag. The observations began at zenith distance = 66 deg. The sun  altitude  is -77.9 deg. 

The galactic latitude b = -29 deg., longitude l = 30 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2471879

We obtain a following upper limits.  

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

   54155 | 2024-05-27 22:09:31 |         MASTER-SAAO | (20h 39m 12.37s , -16d 25m 18.1s) |   C |    60 | 16.8 |        
   54215 | 2024-05-27 22:09:31 |         MASTER-SAAO | (20h 39m 12.37s , -16d 25m 18.0s) |   C |   180 | 17.4 |  Coadd 
   54235 | 2024-05-27 22:10:50 |         MASTER-SAAO | (20h 39m 12.28s , -16d 25m 13.7s) |   C |    60 | 16.9 |        
   54314 | 2024-05-27 22:12:10 |         MASTER-SAAO | (20h 39m 12.20s , -16d 25m 11.2s) |   C |    60 | 16.9 |        
   54394 | 2024-05-27 22:13:29 |         MASTER-SAAO | (20h 39m 12.11s , -16d 25m 09.7s) |   C |    60 | 16.9 |        
   54454 | 2024-05-27 22:13:29 |         MASTER-SAAO | (20h 39m 12.12s , -16d 25m 09.8s) |   C |   180 | 17.3 |  Coadd 
   54579 | 2024-05-27 22:16:35 |         MASTER-SAAO | (20h 39m 14.41s , -16d 25m 58.9s) |   C |    60 | 16.9 |        
   54659 | 2024-05-27 22:17:54 |         MASTER-SAAO | (20h 39m 14.28s , -16d 25m 59.0s) |   C |    60 | 16.9 |        
   54738 | 2024-05-27 22:19:14 |         MASTER-SAAO | (20h 39m 14.20s , -16d 25m 59.2s) |   C |    60 | 17.0 |        
Filter C is a clear (unfiltred) band. 


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


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