TITLE:   GCN CIRCULAR
NUMBER:  36775
SUBJECT: Fermi  trigger No 741211696: Global MASTER-Net observations report
DATE:    24/06/28 00:31:20 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-Tavrida robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240627.84 (trigger No 741211696,14h 21m 00.00s , +48d 31m 12.0s, R=2.29) errorbox  12 sec after notice time and 13640 sec after trigger time at 2024-06-27 23:55:32 UT, with upper limit up to  18.9 mag. Observations started at twilight.  The observations began at zenith distance = 61 deg. The sun  altitude  is -16.4 deg. 

The galactic latitude b = 62 deg., longitude l = 89 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2510641

We obtain a following upper limits.  

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

   13730 | 2024-06-27 23:55:32 |      MASTER-Tavrida | (14h 21m 33.42s , +48d 29m 06.9s) |   C |   180 | 18.9 |        
   13730 | 2024-06-27 23:55:32 |      MASTER-Tavrida | (14h 21m 36.38s , +48d 24m 39.1s) |   C |   180 | 18.2 |        
   13925 | 2024-06-27 23:58:47 |      MASTER-Tavrida | (14h 21m 39.45s , +48d 29m 30.3s) |   C |   180 | 18.8 |        
   13925 | 2024-06-27 23:58:47 |      MASTER-Tavrida | (14h 21m 42.46s , +48d 25m 02.3s) |   C |   180 | 18.2 |        
   14120 | 2024-06-28 00:02:02 |      MASTER-Tavrida | (14h 21m 37.95s , +48d 30m 55.7s) |   C |   180 | 18.8 |        
   14120 | 2024-06-28 00:02:02 |      MASTER-Tavrida | (14h 21m 41.05s , +48d 26m 27.6s) |   C |   180 | 18.2 |        
   14315 | 2024-06-28 00:05:17 |      MASTER-Tavrida | (14h 21m 38.65s , +48d 29m 26.6s) |   C |   180 | 18.7 |        
   14315 | 2024-06-28 00:05:17 |      MASTER-Tavrida | (14h 21m 41.74s , +48d 24m 58.1s) |   C |   180 | 18.1 |        
Filter C is a clear (unfiltred) band. 


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