TITLE:   GCN CIRCULAR
NUMBER:  35447
SUBJECT: Fermi  trigger No 725806648: Global MASTER-Net observations report
DATE:    24/01/01 13:16:02 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-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240101.54 (trigger No 725806648,00h 02m 38.40s , +32d 10m 48.0s, R=4.6) errorbox  40 sec after notice time and 51 sec after trigger time at 2024-01-01 12:58:15 UT, with upper limit up to  19.6 mag. The observations began at zenith distance = 34 deg. The sun  altitude  is -34.6 deg. 

The galactic latitude b = -29 deg., longitude l = 112 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2347947

We obtain a following upper limits.  

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

      57 | 2024-01-01 12:58:15 |        MASTER-Tunka | (00h 00m 36.90s , +32d 16m 39.5s) |   C |    10 | 18.6 |        
      77 | 2024-01-01 12:58:15 |        MASTER-Tunka | (00h 00m 36.90s , +32d 16m 39.6s) |   C |    50 | 19.6 |  Coadd 
     137 | 2024-01-01 12:58:15 |        MASTER-Tunka | (00h 00m 36.90s , +32d 16m 39.6s) |   C |   170 | 19.3 |  Coadd 
      91 | 2024-01-01 12:58:44 |        MASTER-Tunka | (00h 00m 29.45s , +32d 15m 44.2s) |   C |    20 | 19.0 |        
     119 | 2024-01-01 12:59:12 |        MASTER-Tunka | (00h 00m 29.93s , +32d 16m 44.3s) |   C |    20 | 18.8 |        
     152 | 2024-01-01 12:59:41 |        MASTER-Tunka | (00h 00m 36.93s , +32d 15m 44.5s) |   C |    30 | 19.0 |        
     197 | 2024-01-01 12:59:41 |        MASTER-Tunka | (00h 00m 36.93s , +32d 15m 44.3s) |   C |   120 | 18.9 |  Coadd 
     196 | 2024-01-01 13:00:19 |        MASTER-Tunka | (00h 00m 29.28s , +32d 14m 45.2s) |   C |    40 | 18.2 |        
     250 | 2024-01-01 13:01:08 |        MASTER-Tunka | (00h 00m 35.14s , +32d 14m 57.1s) |   C |    50 | 18.3 |        
     313 | 2024-01-01 13:02:06 |        MASTER-Tunka | (00h 00m 32.83s , +32d 16m 26.7s) |   C |    60 | 18.7 |        
     381 | 2024-01-01 13:03:14 |        MASTER-Tunka | (00h 00m 32.67s , +32d 15m 15.9s) |   C |    60 | 18.7 |        
     468 | 2024-01-01 13:04:41 |        MASTER-Tunka | (23h 53m 15.78s , +29d 47m 09.9s) |   C |    60 | 18.2 |        
Filter C is a clear (unfiltred) band. 


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