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GCN Circular 36049

Subject
Fermi GRB 240408A: Global MASTER-Net observations report
Date
2024-04-08T01:16:16Z (a month 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-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 GRB 240408A ( Fermi GBM team, GCN 36048Not found
 
 
) errorbox  22 sec after notice time and 61 sec after trigger time at 2024-04-08 01:03:14 UT, with upper limit up to  17.9 mag. The observations began at zenith distance = 70 deg. The sun  altitude  is -22.0 deg. 

The galactic latitude b = -11 deg., longitude l = 111 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2417230

We obtain a following upper limits.  

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

      92 | 2024-04-08 01:03:14 |      MASTER-Tavrida | (23h 13m 54.05s , +41d 05m 54.4s) |   C |    60 | 17.9 |        
     165 | 2024-04-08 01:04:27 |      MASTER-Tavrida | (23h 45m 13.46s , +43d 00m 24.3s) |   C |    60 | 17.7 |        
     237 | 2024-04-08 01:05:39 |      MASTER-Tavrida | (23h 56m 08.75s , +42d 58m 55.2s) |   C |    60 | 17.5 |        
     308 | 2024-04-08 01:06:50 |      MASTER-Tavrida | (23h 50m 56.56s , +44d 54m 25.3s) |   C |    60 | 17.7 |        
     380 | 2024-04-08 01:08:02 |      MASTER-Tavrida | (00h 02m 06.98s , +44d 53m 31.2s) |   C |    60 | 17.6 |        
     452 | 2024-04-08 01:09:14 |      MASTER-Tavrida | (23h 48m 34.73s , +44d 54m 50.7s) |   C |    60 | 17.7 |        
     524 | 2024-04-08 01:10:26 |      MASTER-Tavrida | (23h 59m 57.61s , +44d 53m 36.5s) |   C |    60 | 17.6 |        
     598 | 2024-04-08 01:11:40 |      MASTER-Tavrida | (23h 23m 48.44s , +39d 11m 37.5s) |   C |    60 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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