GCN Circular 35264

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-Kislovodsk robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Lomonosov MSU, Kislovodsk Solar Station of Pulkovo observatory) started inspect of the Fermi GRB231203.83 (trigger No 723326169,13h 09m 19.20s , +42d 32m 24.0s, R=15.19) errorbox  78590 sec after notice time and 78625 sec after trigger time at 2023-12-04 17:46:29 UT, with upper limit up to  19.4 mag. The observations began at zenith distance = 77 deg. The sun  altitude  is -44.9 deg. 

MASTER-Tunka robotic telescope  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB231203.83 errorbox  1 days 1635 sec after notice time and 1 days 1670 sec after trigger time at 2023-12-04 20:23:54 UT, with upper limit up to  16.1 mag. The observations began at zenith distance = 40 deg. The sun  altitude  is -40.9 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB231203.83 errorbox  1 days 23364 sec after notice time and 1 days 23399 sec after trigger time at 2023-12-05 02:26:03 UT, with upper limit up to  18.6 mag. The observations began at zenith distance = 51 deg. The sun  altitude  is -27.0 deg. 

The galactic latitude b = 74 deg., longitude l = 109 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2322870

We obtain a following upper limits.  

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

   78655 | 2023-12-04 17:46:29 |   MASTER-Kislovodsk | (13h 19m 32.18s , +59d 38m 46.2s) |   C |    60 | 17.4 |        
   88085 | 2023-12-04 20:23:54 |        MASTER-Tunka | (13h 00m 14.43s , +59d 01m 04.5s) |   C |    30 | 15.3 |        
   88144 | 2023-12-04 20:24:53 |        MASTER-Tunka | (13h 00m 20.71s , +59d 00m 03.0s) |   C |    30 | 16.1 |        
   88200 | 2023-12-04 20:25:48 |        MASTER-Tunka | (13h 00m 14.39s , +58d 59m 03.9s) |   C |    30 | 16.0 |        
   88255 | 2023-12-04 20:26:43 |        MASTER-Tunka | (13h 00m 21.40s , +58d 59m 20.1s) |   C |    30 | 15.9 |        
  109804 | 2023-12-05 02:26:03 |      MASTER-Tavrida | (13h 42m 19.94s , +28d 37m 41.4s) |   C |    10 | 17.0 |        
  110168 | 2023-12-05 02:31:41 |      MASTER-Tavrida | (13h 37m 18.56s , +28d 06m 02.1s) |   C |    60 | 18.3 |        
  110240 | 2023-12-05 02:32:54 |      MASTER-Tavrida | (13h 34m 48.13s , +29d 59m 57.4s) |   C |    60 | 18.6 |        
  111671 | 2023-12-05 02:55:45 |   MASTER-Kislovodsk | (13h 30m 27.11s , +26d 56m 19.7s) |   C |   180 | 18.9 |        
  111671 | 2023-12-05 02:55:45 |   MASTER-Kislovodsk | (13h 35m 12.26s , +26d 33m 16.6s) |   C |   180 | 19.4 |        
  111706 | 2023-12-05 02:57:19 |      MASTER-Tavrida | (13h 37m 18.68s , +28d 06m 28.9s) |   C |    60 | 18.2 |        
  111778 | 2023-12-05 02:58:32 |      MASTER-Tavrida | (13h 46m 18.95s , +28d 07m 28.0s) |   C |    60 | 18.3 |        
  111851 | 2023-12-05 02:59:45 |      MASTER-Tavrida | (13h 34m 47.07s , +30d 00m 31.0s) |   C |    60 | 18.6 |        
  111924 | 2023-12-05 03:00:57 |      MASTER-Tavrida | (13h 44m 02.56s , +30d 01m 42.6s) |   C |    60 | 18.3 |        
  112213 | 2023-12-05 03:05:47 |   MASTER-Kislovodsk | (13h 30m 05.97s , +26d 04m 28.1s) |   C |    60 | 18.2 |        
  112674 | 2023-12-05 03:13:28 |      MASTER-Tavrida | (13h 37m 17.73s , +28d 07m 18.3s) |   C |    60 | 18.4 |        
  112776 | 2023-12-05 03:14:10 |   MASTER-Kislovodsk | (13h 30m 31.58s , +26d 58m 04.0s) |   C |   180 | 18.5 |        
  112776 | 2023-12-05 03:14:10 |   MASTER-Kislovodsk | (13h 35m 16.88s , +26d 35m 10.2s) |   C |   180 | 18.9 |        
  112746 | 2023-12-05 03:14:40 |      MASTER-Tavrida | (13h 46m 15.83s , +28d 06m 06.3s) |   C |    60 | 18.3 |        
  112818 | 2023-12-05 03:15:52 |      MASTER-Tavrida | (13h 34m 49.36s , +30d 00m 39.3s) |   C |    60 | 18.6 |        
  112890 | 2023-12-05 03:17:04 |      MASTER-Tavrida | (13h 43m 59.76s , +30d 01m 47.1s) |   C |    60 | 18.5 |        
  113726 | 2023-12-05 03:30:59 |      MASTER-Tavrida | (13h 46m 15.12s , +28d 06m 08.5s) |   C |    60 | 18.4 |        
  113797 | 2023-12-05 03:32:11 |      MASTER-Tavrida | (13h 44m 03.01s , +30d 00m 35.3s) |   C |    60 | 18.4 |        
Filter C is a clear (unfiltred) band. 


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