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GCN Circular 33468

Subject
Fermi GRB 230313A: Global MASTER-Net observations report
Date
2023-03-13T12:15:14Z (a year 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-Amur robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 230313A ( Fermi GBM team, GCN 33467) errorbox  34 sec after notice time and 69 sec after trigger time at 2023-03-13 11:39:52 UT, with upper limit up to  15.6 mag. The observations began at zenith distance = 57 deg. The sun  altitude  is -21.1 deg. 

The galactic latitude b = 69 deg., longitude l = 104 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2204375

We obtain a following upper limits.  

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

      74 | 2023-03-13 11:39:52 |         MASTER-Amur | (13h 42m 32.30s , +48d 00m 17.7s) |   C |    10 | 13.3 |        
     114 | 2023-03-13 11:40:27 |         MASTER-Amur | (13h 22m 24.94s , +47d 06m 29.4s) |   C |    20 | 14.3 |        
     159 | 2023-03-13 11:41:06 |         MASTER-Amur | (13h 22m 25.83s , +47d 07m 25.7s) |   C |    30 | 14.6 |        
     213 | 2023-03-13 11:41:56 |         MASTER-Amur | (13h 22m 30.64s , +47d 06m 59.6s) |   C |    40 | 14.6 |        
     278 | 2023-03-13 11:42:55 |         MASTER-Amur | (13h 22m 26.23s , +47d 05m 20.0s) |   C |    50 | 14.9 |        
     352 | 2023-03-13 11:44:05 |         MASTER-Amur | (13h 22m 30.88s , +47d 06m 11.1s) |   C |    60 | 14.8 |        
     457 | 2023-03-13 11:45:40 |         MASTER-Amur | (13h 22m 21.14s , +47d 09m 33.7s) |   C |    80 | 14.9 |        
     567 | 2023-03-13 11:47:19 |         MASTER-Amur | (13h 22m 14.50s , +47d 08m 42.4s) |   C |   100 | 14.9 |        
     701 | 2023-03-13 11:49:19 |         MASTER-Amur | (13h 22m 15.66s , +47d 09m 39.3s) |   C |   130 | 15.0 |        
     866 | 2023-03-13 11:51:48 |         MASTER-Amur | (13h 22m 20.83s , +47d 08m 38.9s) |   C |   160 | 15.5 |        
    1055 | 2023-03-13 11:54:48 |         MASTER-Amur | (13h 22m 15.07s , +47d 07m 36.5s) |   C |   180 | 15.4 |        
    1255 | 2023-03-13 11:58:07 |         MASTER-Amur | (13h 22m 21.36s , +47d 07m 41.7s) |   C |   180 | 15.4 |        
    1454 | 2023-03-13 12:01:27 |         MASTER-Amur | (13h 22m 19.28s , +47d 09m 04.9s) |   C |   180 | 15.5 |        
    1654 | 2023-03-13 12:04:46 |         MASTER-Amur | (13h 22m 19.50s , +47d 07m 47.1s) |   C |   180 | 15.6 |        
    1793 | 2023-03-13 12:08:06 |         MASTER-Amur | (13h 22m 31.48s , +46d 43m 11.8s) |   C |    60 | 14.8 |        
    1873 | 2023-03-13 12:09:26 |         MASTER-Amur | (13h 23m 26.57s , +46d 42m 44.8s) |   C |    60 | 14.8 |        
Filter C is a clear (unfiltred) band. 


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