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GCN Circular 36912

Subject
Fermi GRB 240720A: Global MASTER-Net observations report
Date
2024-07-21T02:15:55Z (4 months 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 240720A ( C. Fletcher et al., GCN 36910Not found
 
 
) errorbox  85623 sec after notice time and 85662 sec after trigger time at 2024-07-21 00:12:33 UT, with upper limit up to  17.5 mag. The observations began at zenith distance = 77 deg. The sun  altitude  is -17.6 deg. 

The galactic latitude b = 16 deg., longitude l = 174 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2535620

We obtain a following upper limits.  

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

   85692 | 2024-07-21 00:12:33 |      MASTER-Tavrida | (06h 23m 51.35s , +44d 06m 28.9s) |   C |    60 | 16.4 |        
   85692 | 2024-07-21 00:12:33 |      MASTER-Tavrida | (06h 23m 44.17s , +44d 11m 29.8s) |   C |    60 | 12.9 |        
   85844 | 2024-07-21 00:15:04 |      MASTER-Tavrida | (06h 15m 41.27s , +42d 46m 42.4s) |   C |    60 | 16.6 |        
   85844 | 2024-07-21 00:15:05 |      MASTER-Tavrida | (06h 15m 34.35s , +42d 51m 42.1s) |   C |    60 | 15.9 |        
   85919 | 2024-07-21 00:16:20 |      MASTER-Tavrida | (06h 32m 34.56s , +45d 24m 21.2s) |   C |    60 | 16.5 |        
   85919 | 2024-07-21 00:16:20 |      MASTER-Tavrida | (06h 32m 27.40s , +45d 29m 21.2s) |   C |    60 | 14.9 |        
   87055 | 2024-07-21 00:35:15 |      MASTER-Tavrida | (06h 23m 44.72s , +44d 05m 43.9s) |   C |    60 | 16.5 |        
   87055 | 2024-07-21 00:35:16 |      MASTER-Tavrida | (06h 23m 38.07s , +44d 10m 39.2s) |   C |    60 | 17.0 |        
   87130 | 2024-07-21 00:36:31 |      MASTER-Tavrida | (06h 34m 59.60s , +44d 05m 29.5s) |   C |    60 | 16.4 |        
   87130 | 2024-07-21 00:36:31 |      MASTER-Tavrida | (06h 34m 52.78s , +44d 10m 26.1s) |   C |    60 | 16.9 |        
   87206 | 2024-07-21 00:37:47 |      MASTER-Tavrida | (06h 15m 38.08s , +42d 44m 56.7s) |   C |    60 | 17.0 |        
   87206 | 2024-07-21 00:37:47 |      MASTER-Tavrida | (06h 15m 31.46s , +42d 49m 53.4s) |   C |    60 | 17.5 |        
   87282 | 2024-07-21 00:39:02 |      MASTER-Tavrida | (06h 26m 37.68s , +42d 45m 52.5s) |   C |    60 | 16.5 |        
   87282 | 2024-07-21 00:39:02 |      MASTER-Tavrida | (06h 26m 30.91s , +42d 50m 49.4s) |   C |    60 | 17.1 |        
   87357 | 2024-07-21 00:40:18 |      MASTER-Tavrida | (06h 32m 28.36s , +45d 24m 08.5s) |   C |    60 | 16.8 |        
   87357 | 2024-07-21 00:40:18 |      MASTER-Tavrida | (06h 32m 21.42s , +45d 29m 05.2s) |   C |    60 | 17.2 |        
   87433 | 2024-07-21 00:41:33 |      MASTER-Tavrida | (06h 43m 51.42s , +45d 23m 16.1s) |   C |    60 | 16.7 |        
   87433 | 2024-07-21 00:41:33 |      MASTER-Tavrida | (06h 43m 44.36s , +45d 28m 13.4s) |   C |    60 | 17.0 |        
   87583 | 2024-07-21 00:44:04 |      MASTER-Tavrida | (06h 18m 41.97s , +41d 27m 51.9s) |   C |    60 | 16.7 |        
   87584 | 2024-07-21 00:44:04 |      MASTER-Tavrida | (06h 18m 35.37s , +41d 32m 49.1s) |   C |    60 | 17.1 |        
   87734 | 2024-07-21 00:46:34 |      MASTER-Tavrida | (06h 29m 05.41s , +45d 22m 38.0s) |   C |    60 | 16.6 |        
   87734 | 2024-07-21 00:46:34 |      MASTER-Tavrida | (06h 28m 58.60s , +45d 27m 34.8s) |   C |    60 | 17.2 |        
   87885 | 2024-07-21 00:49:06 |      MASTER-Tavrida | (06h 20m 29.41s , +44d 03m 06.4s) |   C |    60 | 16.7 |        
   87885 | 2024-07-21 00:49:06 |      MASTER-Tavrida | (06h 20m 22.82s , +44d 08m 02.5s) |   C |    60 | 17.1 |        
   88262 | 2024-07-21 00:55:23 |      MASTER-Tavrida | (06h 23m 42.82s , +44d 04m 55.1s) |   C |    60 | 16.5 |        
   88262 | 2024-07-21 00:55:23 |      MASTER-Tavrida | (06h 23m 36.27s , +44d 09m 51.5s) |   C |    60 | 17.0 |        
   88337 | 2024-07-21 00:56:38 |      MASTER-Tavrida | (06h 34m 55.98s , +44d 04m 39.2s) |   C |    60 | 16.4 |        
   88337 | 2024-07-21 00:56:38 |      MASTER-Tavrida | (06h 34m 49.31s , +44d 09m 35.9s) |   C |    60 | 16.9 |        
   88414 | 2024-07-21 00:57:55 |      MASTER-Tavrida | (06h 15m 34.44s , +42d 44m 18.1s) |   C |    60 | 16.7 |        
   88414 | 2024-07-21 00:57:55 |      MASTER-Tavrida | (06h 15m 28.08s , +42d 49m 14.2s) |   C |    60 | 17.0 |        
   88489 | 2024-07-21 00:59:10 |      MASTER-Tavrida | (06h 26m 35.20s , +42d 45m 09.6s) |   C |    60 | 16.3 |        
   88489 | 2024-07-21 00:59:10 |      MASTER-Tavrida | (06h 26m 28.72s , +42d 50m 05.7s) |   C |    60 | 16.8 |        
   88564 | 2024-07-21 01:00:25 |      MASTER-Tavrida | (06h 32m 25.26s , +45d 23m 00.1s) |   C |    60 | 16.4 |        
   88564 | 2024-07-21 01:00:25 |      MASTER-Tavrida | (06h 32m 18.62s , +45d 27m 56.1s) |   C |    60 | 16.8 |        
   88645 | 2024-07-21 01:01:46 |      MASTER-Tavrida | (06h 43m 48.35s , +45d 22m 28.2s) |   C |    60 | 16.2 |        
   88646 | 2024-07-21 01:01:46 |      MASTER-Tavrida | (06h 43m 41.55s , +45d 27m 24.6s) |   C |    60 | 16.7 |        
   88797 | 2024-07-21 01:04:18 |      MASTER-Tavrida | (06h 18m 39.42s , +41d 27m 20.1s) |   C |    60 | 16.2 |        
   88797 | 2024-07-21 01:04:18 |      MASTER-Tavrida | (06h 18m 33.15s , +41d 32m 16.0s) |   C |    60 | 16.6 |        
   88947 | 2024-07-21 01:06:48 |      MASTER-Tavrida | (06h 29m 01.38s , +45d 21m 52.7s) |   C |    60 | 16.1 |        
   88947 | 2024-07-21 01:06:48 |      MASTER-Tavrida | (06h 28m 54.99s , +45d 26m 47.6s) |   C |    60 | 16.5 |        
   89097 | 2024-07-21 01:09:18 |      MASTER-Tavrida | (06h 20m 26.32s , +44d 02m 29.3s) |   C |    60 | 15.9 |        
   89097 | 2024-07-21 01:09:18 |      MASTER-Tavrida | (06h 20m 20.12s , +44d 07m 23.6s) |   C |    60 | 16.5 |        
Filter C is a clear (unfiltred) band. 


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