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GCN Circular 31913

Subject
Fermi GRB 220417A: Global MASTER-Net observations report
Date
2022-04-17T17:30:19Z (2 years ago)
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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 220417A ( Fermi GBM team, GCN 31912) errorbox  10933 sec after notice time and 10962 sec after trigger time at 2022-04-17 16:55:18 UT, with upper limit up to  18.2 mag. Observations started at twilight.  The observations began at zenith distance = 43 deg. The sun  altitude  is -9.1 deg. 

The galactic latitude b = 10 deg., longitude l = 205 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=1945725

We obtain a following upper limits.  

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

   10992 | 2022-04-17 16:55:18 |         MASTER-SAAO | (07h 06m 38.28s , +08d 45m 24.4s) |   C |    60 | 15.9 |        
   11072 | 2022-04-17 16:56:38 |         MASTER-SAAO | (07h 14m 48.63s , +08d 45m 35.3s) |   C |    60 | 16.3 |        
   11163 | 2022-04-17 16:58:09 |         MASTER-SAAO | (07h 09m 06.34s , +10d 41m 17.1s) |   C |    60 | 16.4 |        
   11254 | 2022-04-17 16:59:40 |         MASTER-SAAO | (06h 59m 49.61s , +14d 29m 20.8s) |   C |    60 | 16.4 |        
   11334 | 2022-04-17 17:00:59 |         MASTER-SAAO | (07h 07m 58.48s , +14d 28m 42.2s) |   C |    60 | 16.7 |        
   11509 | 2022-04-17 17:03:54 |         MASTER-SAAO | (07h 17m 16.46s , +10d 40m 40.1s) |   C |    60 | 17.0 |        
   11600 | 2022-04-17 17:05:25 |         MASTER-SAAO | (07h 11m 57.99s , +12d 33m 45.2s) |   C |    60 | 17.1 |        
   11679 | 2022-04-17 17:06:45 |         MASTER-SAAO | (07h 20m 15.06s , +12d 34m 06.3s) |   C |    60 | 17.2 |        
   11771 | 2022-04-17 17:08:16 |         MASTER-SAAO | (06h 56m 29.96s , +12d 35m 39.7s) |   C |    60 | 17.2 |        
   11862 | 2022-04-17 17:09:47 |         MASTER-SAAO | (07h 04m 41.19s , +12d 34m 13.1s) |   C |    60 | 17.4 |        
   11942 | 2022-04-17 17:11:07 |         MASTER-SAAO | (07h 06m 46.87s , +08d 47m 40.7s) |   C |    60 | 17.5 |        
   12033 | 2022-04-17 17:12:38 |         MASTER-SAAO | (07h 14m 45.42s , +08d 46m 56.4s) |   C |    60 | 17.6 |        
   12112 | 2022-04-17 17:13:58 |         MASTER-SAAO | (07h 09m 05.17s , +10d 42m 00.2s) |   C |    60 | 17.8 |        
   12204 | 2022-04-17 17:15:29 |         MASTER-SAAO | (06h 59m 51.07s , +14d 29m 07.7s) |   C |    60 | 17.9 |        
   12283 | 2022-04-17 17:16:49 |         MASTER-SAAO | (07h 08m 01.35s , +14d 28m 11.3s) |   C |    60 | 17.9 |        
   12374 | 2022-04-17 17:18:20 |         MASTER-SAAO | (06h 53m 42.16s , +10d 41m 56.9s) |   C |    60 | 18.0 |        
   12465 | 2022-04-17 17:19:50 |         MASTER-SAAO | (07h 01m 50.54s , +10d 40m 34.4s) |   C |    60 | 18.0 |        
   12545 | 2022-04-17 17:21:10 |         MASTER-SAAO | (07h 17m 19.52s , +10d 42m 11.5s) |   C |    60 | 18.2 |        
   12635 | 2022-04-17 17:22:40 |         MASTER-SAAO | (07h 12m 01.86s , +12d 35m 19.6s) |   C |    60 | 18.1 |        
   12714 | 2022-04-17 17:24:00 |         MASTER-SAAO | (07h 20m 13.43s , +12d 36m 22.8s) |   C |    60 | 18.2 |        
Filter C is a clear (unfiltred) band. 


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