TITLE:   GCN CIRCULAR
NUMBER:  36436
SUBJECT: Fermi GRB 240511A: Global MASTER-Net observations report
DATE:    24/05/12 01:31:19 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

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 240511A ( Fermi GBM team, GCN 36428) errorbox  24509 sec after notice time and 24543 sec after trigger time at 2024-05-12 00:55:23 UT, with upper limit up to  18.0 mag. The observations began at zenith distance = 79 deg. The sun  altitude  is -55.5 deg. 

The galactic latitude b = -44 deg., longitude l = 70 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2452442

We obtain a following upper limits.  

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

   24633 | 2024-05-12 00:55:23 |         MASTER-SAAO | (22h 23m 04.05s , +08d 23m 50.7s) |   C |   180 | 17.6 |        
   25535 | 2024-05-12 01:10:25 |         MASTER-SAAO | (22h 24m 51.61s , +08d 10m 11.7s) |   C |   180 | 17.1 |        
   25535 | 2024-05-12 01:10:25 |         MASTER-SAAO | (22h 23m 01.57s , +08d 23m 53.8s) |   C |   180 | 17.9 |        
   25896 | 2024-05-12 01:16:26 |         MASTER-SAAO | (22h 24m 46.54s , +08d 10m 52.2s) |   C |   180 | 17.4 |        
   25896 | 2024-05-12 01:16:26 |         MASTER-SAAO | (22h 22m 56.46s , +08d 24m 32.8s) |   C |   180 | 17.9 |        
   26096 | 2024-05-12 01:19:45 |         MASTER-SAAO | (22h 24m 48.69s , +08d 09m 19.9s) |   C |   180 | 17.5 |        
   26096 | 2024-05-12 01:19:45 |         MASTER-SAAO | (22h 22m 58.61s , +08d 22m 59.7s) |   C |   180 | 18.0 |        
Filter C is a clear (unfiltred) band. 


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