TITLE:   GCN CIRCULAR
NUMBER:  34244
SUBJECT: Fermi  trigger No 711853834: Global MASTER-Net observations report
DATE:    23/07/24 01:30:53 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, D. Vlasenko, 
G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov,  D.Cheryasov, Ya.Kechin
(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. Gres, N.M. Budnev
(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),

A. Gabovich, V.Yurkov 
(Blagoveschensk Educational State University)


MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) started inspect of the Fermi GRB230724.05 (trigger No 711853834,18h 33m 36.00s , +22d 43m 12.0s, R=39.44) errorbox  115 sec after notice time and 151 sec after trigger time at 2023-07-24 01:13:00 UT, with upper limit up to  18.2 mag. The observations began at zenith distance = 59 deg. The sun  altitude  is -42.2 deg. 

The galactic latitude b = 13 deg., longitude l = 52 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2244107

We obtain a following upper limits.  

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

     241 | 2023-07-24 01:13:00 |         MASTER-OAFA | (16h 48m 04.17s , +27d 54m 03.9s) |   C |   180 | 16.2 |        
     441 | 2023-07-24 01:16:20 |         MASTER-OAFA | (16h 57m 03.52s , +27d 55m 11.2s) |   C |   180 | 17.4 |        
     641 | 2023-07-24 01:19:40 |         MASTER-OAFA | (16h 48m 04.89s , +26d 00m 05.7s) |   C |   180 | 18.2 |        
Filter C is a clear (unfiltred) band. 


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