TITLE:   GCN CIRCULAR
NUMBER:  33249
SUBJECT: Fermi GRB 230201B: Global MASTER-Net observations report 
DATE:    23/02/02 09:45:19 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 230201B ( Fermi GBM team, GCN 33247) errorbox  48850 sec after notice time and 48883 sec after trigger time at 2023-02-02 09:31:32 UT, with upper limit up to  16.6 mag. Observations started at twilight.  The observations began at zenith distance = 36 deg. The sun  altitude  is -10.9 deg. 

The galactic latitude b = -44 deg., longitude l = 143 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2196085

We obtain a following upper limits.  

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

     656 | 2023-02-01 20:06:43 |             MASTER- | (01h 49m 58.81s , +16d 29m 53.9s) |   C |   120 | 16.7 |        
     810 | 2023-02-01 20:09:03 |             MASTER- | (01h 50m 03.58s , +16d 29m 05.6s) |   C |   150 | 16.6 |        
    1007 | 2023-02-01 20:12:04 |             MASTER- | (01h 49m 56.20s , +16d 28m 21.1s) |   C |   180 | 16.7 |        
    1206 | 2023-02-01 20:15:24 |             MASTER- | (01h 50m 01.17s , +16d 28m 39.3s) |   C |   180 | 16.6 |        
   48914 | 2023-02-02 09:31:32 |         MASTER-Amur | (01h 47m 36.09s , +16d 24m 48.5s) |   C |    60 | 16.1 |        
   48993 | 2023-02-02 09:32:51 |         MASTER-Amur | (01h 55m 52.14s , +16d 26m 10.9s) |   C |    60 | 16.3 |        
   49232 | 2023-02-02 09:36:50 |         MASTER-Amur | (01h 46m 34.64s , +14d 31m 51.4s) |   C |    60 | 16.3 |        
   49312 | 2023-02-02 09:38:09 |         MASTER-Amur | (01h 54m 45.72s , +14d 30m 46.2s) |   C |    60 | 16.5 |        
   49393 | 2023-02-02 09:39:31 |         MASTER-Amur | (01h 48m 40.42s , +18d 20m 14.0s) |   C |    60 | 16.6 |        
Filter C is a clear (unfiltred) band. 


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