TITLE:   GCN CIRCULAR
NUMBER:  33245
SUBJECT: Fermi GRB 230201A: Global MASTER-Net observations report 
DATE:    23/02/01 14:15:17 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, 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 230201A ( Fermi GBM team, GCN 33242) errorbox  30102 sec after notice time and 30143 sec after trigger time at 2023-02-01 14:01:57 UT, with upper limit up to  16.6 mag. The observations began at zenith distance = 69 deg. The sun  altitude  is -51.3 deg. 

The galactic latitude b = -15 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=2195907

We obtain a following upper limits.  

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

   30174 | 2023-02-01 14:01:57 |         MASTER-Amur | (23h 26m 10.17s , +46d 56m 59.1s) |   C |    60 | 16.5 |        
   30253 | 2023-02-01 14:03:16 |         MASTER-Amur | (23h 37m 52.83s , +46d 57m 45.0s) |   C |    60 | 16.5 |        
   30333 | 2023-02-01 14:04:36 |         MASTER-Amur | (23h 43m 41.80s , +45d 01m 42.1s) |   C |    60 | 16.6 |        
   30413 | 2023-02-01 14:05:56 |         MASTER-Amur | (23h 55m 06.14s , +45d 01m 50.0s) |   C |    60 | 16.5 |        
   30492 | 2023-02-01 14:07:15 |         MASTER-Amur | (23h 32m 04.89s , +48d 49m 45.5s) |   C |    60 | 16.5 |        
   30572 | 2023-02-01 14:08:35 |         MASTER-Amur | (23h 44m 15.31s , +48d 51m 13.9s) |   C |    60 | 16.5 |        
Filter C is a clear (unfiltred) band. 


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