GCN Circular 35711

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-Tunka robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB240209.26 (trigger No 729152364,17h 19m 04.80s , +70d 29m 24.0s, R=9.13) errorbox  1094 sec after notice time and 33812 sec after trigger time at 2024-02-09 15:42:52 UT, with upper limit up to  18.9 mag. The observations began at zenith distance = 56 deg. The sun  altitude  is -48.8 deg. 

MASTER-Tavrida robotic telescope  located in Russia (Lomonosov MSU, SAI Crimea astronomical station) started inspect of the Fermi GRB240209.26 errorbox  2344 sec after notice time and 35062 sec after trigger time at 2024-02-09 16:03:42 UT, with upper limit up to  18.8 mag. Observations started at twilight.  The observations began at zenith distance = 68 deg. The sun  altitude  is -11.4 deg. 

The galactic latitude b = 33 deg., longitude l = 101 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2374442

We obtain a following upper limits.  

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

   33843 | 2024-02-09 15:42:52 |        MASTER-Tunka | (17h 48m 40.52s , +71d 18m 47.3s) |   C |    60 | 18.3 |        
   34177 | 2024-02-09 15:48:27 |        MASTER-Tunka | (17h 13m 02.93s , +67d 31m 23.7s) |   C |    60 | 18.3 |        
   34250 | 2024-02-09 15:49:39 |        MASTER-Tunka | (17h 34m 04.79s , +67d 30m 57.1s) |   C |    60 | 18.3 |        
   34322 | 2024-02-09 15:50:51 |        MASTER-Tunka | (17h 17m 25.05s , +69d 25m 43.5s) |   C |    60 | 18.9 |        
   34394 | 2024-02-09 15:52:03 |        MASTER-Tunka | (17h 40m 15.32s , +69d 26m 19.0s) |   C |    60 | 18.7 |        
   34645 | 2024-02-09 15:56:14 |        MASTER-Tunka | (16h 34m 07.01s , +69d 26m 41.0s) |   C |    60 | 18.3 |        
   34717 | 2024-02-09 15:57:27 |        MASTER-Tunka | (16h 57m 01.47s , +69d 26m 08.8s) |   C |    60 | 18.0 |        
   34790 | 2024-02-09 15:58:40 |        MASTER-Tunka | (17h 23m 51.63s , +71d 21m 02.7s) |   C |    60 | 17.6 |        
   34863 | 2024-02-09 15:59:53 |        MASTER-Tunka | (17h 48m 50.92s , +71d 18m 38.1s) |   C |    60 | 17.1 |        
   34938 | 2024-02-09 16:01:08 |        MASTER-Tunka | (16h 36m 20.84s , +71d 21m 34.1s) |   C |    60 | 17.1 |        
   35017 | 2024-02-09 16:02:26 |        MASTER-Tunka | (17h 01m 22.22s , +71d 21m 41.7s) |   C |    60 | 16.8 |        
   35089 | 2024-02-09 16:03:38 |        MASTER-Tunka | (17h 13m 17.47s , +67d 32m 19.3s) |   C |    60 | 15.9 |        
   35093 | 2024-02-09 16:03:42 |      MASTER-Tavrida | (16h 29m 39.21s , +67d 57m 24.9s) |   C |    60 | 16.8 |        
   35274 | 2024-02-09 16:06:43 |      MASTER-Tavrida | (16h 38m 05.91s , +69d 52m 08.3s) |   C |    60 | 17.5 |        
   35345 | 2024-02-09 16:07:54 |      MASTER-Tavrida | (16h 11m 23.58s , +73d 41m 03.2s) |   C |    60 | 17.6 |        
   35418 | 2024-02-09 16:09:07 |      MASTER-Tavrida | (16h 23m 39.70s , +66d 03m 56.7s) |   C |    60 | 16.9 |        
   35507 | 2024-02-09 16:10:36 |      MASTER-Tavrida | (15h 01m 28.23s , +73d 05m 39.7s) |   C |    60 | 17.9 |        
   35600 | 2024-02-09 16:12:09 |      MASTER-Tavrida | (15h 45m 03.76s , +64d 12m 18.8s) |   C |    60 | 17.3 |        
   35691 | 2024-02-09 16:13:40 |      MASTER-Tavrida | (15h 13m 55.53s , +76d 52m 44.8s) |   C |    60 | 18.1 |        
   36259 | 2024-02-09 16:23:08 |      MASTER-Tavrida | (16h 29m 45.25s , +67d 58m 02.5s) |   C |    60 | 17.5 |        
   36330 | 2024-02-09 16:24:20 |      MASTER-Tavrida | (16h 50m 47.54s , +67d 58m 30.7s) |   C |    60 | 17.6 |        
   36513 | 2024-02-09 16:27:22 |      MASTER-Tavrida | (15h 30m 42.13s , +68d 02m 30.2s) |   C |    60 | 17.7 |        
   36587 | 2024-02-09 16:28:36 |      MASTER-Tavrida | (16h 38m 02.67s , +69d 52m 20.1s) |   C |    60 | 17.9 |        
   36659 | 2024-02-09 16:29:48 |      MASTER-Tavrida | (17h 00m 59.25s , +69d 52m 18.4s) |   C |    60 | 18.3 |        
   36749 | 2024-02-09 16:31:18 |      MASTER-Tavrida | (15h 54m 53.96s , +73d 03m 43.2s) |   C |    60 | 18.1 |        
   36934 | 2024-02-09 16:34:23 |      MASTER-Tavrida | (16h 12m 14.78s , +65d 25m 15.9s) |   C |    60 | 17.6 |        
   37028 | 2024-02-09 16:35:57 |      MASTER-Tavrida | (16h 43m 14.56s , +66d 05m 01.6s) |   C |    60 | 17.2 |        
   37117 | 2024-02-09 16:37:26 |      MASTER-Tavrida | (15h 01m 39.58s , +73d 05m 07.9s) |   C |    60 | 18.0 |        
   37394 | 2024-02-09 16:42:03 |      MASTER-Tavrida | (16h 03m 14.17s , +64d 13m 05.4s) |   C |    60 | 17.7 |        
   37484 | 2024-02-09 16:43:34 |      MASTER-Tavrida | (15h 14m 06.08s , +76d 54m 05.2s) |   C |    60 | 18.3 |        
   37574 | 2024-02-09 16:45:04 |      MASTER-Tavrida | (16h 11m 32.83s , +77d 29m 41.4s) |   C |    60 | 18.3 |        
   37666 | 2024-02-09 16:46:36 |      MASTER-Tavrida | (16h 06m 31.35s , +74d 56m 34.2s) |   C |    60 | 18.4 |        
   37758 | 2024-02-09 16:48:07 |      MASTER-Tavrida | (16h 56m 40.40s , +75d 35m 10.3s) |   C |    60 | 18.1 |        
   37940 | 2024-02-09 16:51:09 |      MASTER-Tavrida | (15h 29m 06.09s , +66d 09m 04.8s) |   C |    60 | 17.6 |        
   38414 | 2024-02-09 16:59:03 |      MASTER-Tavrida | (16h 29m 45.15s , +67d 58m 13.3s) |   C |    60 | 17.6 |        
   38507 | 2024-02-09 17:00:37 |      MASTER-Tavrida | (16h 38m 30.05s , +67d 18m 36.6s) |   C |    60 | 17.5 |        
   38795 | 2024-02-09 17:05:24 |      MASTER-Tavrida | (16h 38m 16.17s , +69d 53m 51.1s) |   C |    60 | 17.8 |        
   38888 | 2024-02-09 17:06:58 |      MASTER-Tavrida | (16h 47m 32.41s , +69d 13m 19.4s) |   C |    60 | 17.8 |        
   38982 | 2024-02-09 17:08:31 |      MASTER-Tavrida | (16h 11m 28.77s , +73d 43m 55.3s) |   C |    60 | 18.0 |        
   39075 | 2024-02-09 17:10:04 |      MASTER-Tavrida | (16h 23m 03.45s , +73d 02m 54.3s) |   C |    60 | 18.1 |        
   39169 | 2024-02-09 17:11:38 |      MASTER-Tavrida | (16h 23m 44.84s , +66d 04m 45.4s) |   C |    60 | 17.5 |        
   39262 | 2024-02-09 17:13:12 |      MASTER-Tavrida | (16h 31m 54.29s , +65d 25m 10.9s) |   C |    60 | 17.1 |        
   39358 | 2024-02-09 17:14:47 |      MASTER-Tavrida | (15h 18m 08.82s , +73d 46m 58.5s) |   C |    60 | 18.2 |        
   39451 | 2024-02-09 17:16:20 |      MASTER-Tavrida | (15h 29m 51.76s , +73d 04m 44.2s) |   C |    60 | 17.9 |        
   39545 | 2024-02-09 17:17:54 |      MASTER-Tavrida | (15h 45m 09.74s , +64d 14m 43.0s) |   C |    60 | 17.3 |        
   39638 | 2024-02-09 17:19:28 |      MASTER-Tavrida | (15h 52m 38.81s , +63d 33m 54.8s) |   C |    60 | 17.6 |        
   39730 | 2024-02-09 17:21:00 |      MASTER-Tavrida | (15h 35m 26.72s , +77d 35m 02.4s) |   C |    60 | 18.2 |        
   39823 | 2024-02-09 17:22:32 |      MASTER-Tavrida | (15h 50m 29.08s , +76d 53m 06.8s) |   C |    60 | 18.2 |        
   39914 | 2024-02-09 17:24:04 |      MASTER-Tavrida | (16h 25m 11.31s , +75d 35m 43.9s) |   C |    60 | 18.2 |        
   40006 | 2024-02-09 17:25:35 |      MASTER-Tavrida | (16h 38m 14.12s , +74d 55m 51.1s) |   C |    60 | 18.2 |        
   40474 | 2024-02-09 17:33:24 |      MASTER-Tavrida | (16h 50m 55.05s , +67d 59m 51.3s) |   C |    60 | 17.8 |        
   40564 | 2024-02-09 17:34:53 |      MASTER-Tavrida | (15h 18m 31.42s , +67d 24m 11.0s) |   C |    60 | 17.9 |        
   40654 | 2024-02-09 17:36:23 |      MASTER-Tavrida | (17h 01m 09.00s , +69d 51m 26.5s) |   C |    60 | 18.0 |        
   40745 | 2024-02-09 17:37:55 |      MASTER-Tavrida | (16h 23m 13.85s , +73d 02m 25.5s) |   C |    60 | 18.1 |        
   40838 | 2024-02-09 17:39:28 |      MASTER-Tavrida | (16h 43m 21.81s , +66d 06m 14.7s) |   C |    60 | 17.4 |        
   40929 | 2024-02-09 17:40:58 |      MASTER-Tavrida | (15h 29m 58.57s , +73d 05m 25.6s) |   C |    60 | 18.1 |        
   41022 | 2024-02-09 17:42:31 |      MASTER-Tavrida | (16h 03m 22.46s , +64d 14m 31.4s) |   C |    60 | 17.6 |        
   41113 | 2024-02-09 17:44:02 |      MASTER-Tavrida | (15h 50m 32.95s , +76d 53m 32.0s) |   C |    60 | 18.1 |        
   41203 | 2024-02-09 17:45:32 |      MASTER-Tavrida | (16h 56m 48.04s , +75d 36m 23.6s) |   C |    60 | 18.1 |        
   41482 | 2024-02-09 17:50:11 |      MASTER-Tavrida | (15h 46m 58.94s , +71d 12m 16.6s) |   C |    60 | 17.9 |        
   41765 | 2024-02-09 17:54:55 |      MASTER-Tavrida | (15h 10m 43.22s , +69d 58m 43.6s) |   C |    60 | 17.0 |        
   41951 | 2024-02-09 17:58:00 |      MASTER-Tavrida | (15h 46m 43.44s , +66d 10m 09.0s) |   C |    60 | 17.8 |        
   42217 | 2024-02-09 18:02:26 |      MASTER-Tavrida | (15h 50m 48.26s , +79d 29m 58.2s) |   C |    60 | 18.1 |        
   42310 | 2024-02-09 18:03:59 |      MASTER-Tavrida | (16h 23m 12.95s , +76d 52m 50.2s) |   C |    60 | 17.9 |        
   42404 | 2024-02-09 18:05:33 |      MASTER-Tavrida | (16h 01m 36.48s , +71d 51m 06.4s) |   C |    60 | 18.0 |        
   42497 | 2024-02-09 18:07:06 |      MASTER-Tavrida | (16h 12m 12.13s , +71d 11m 20.6s) |   C |    60 | 18.1 |        
   42592 | 2024-02-09 18:08:41 |      MASTER-Tavrida | (15h 49m 47.53s , +68d 03m 35.8s) |   C |    60 | 17.9 |        
   42685 | 2024-02-09 18:10:15 |      MASTER-Tavrida | (15h 58m 37.11s , +67d 21m 55.0s) |   C |    60 | 18.1 |        
   42779 | 2024-02-09 18:11:48 |      MASTER-Tavrida | (15h 54m 38.40s , +69d 56m 37.2s) |   C |    60 | 18.1 |        
   42872 | 2024-02-09 18:13:21 |      MASTER-Tavrida | (16h 04m 17.79s , +69d 17m 35.6s) |   C |    60 | 17.8 |        
   42967 | 2024-02-09 18:14:57 |      MASTER-Tavrida | (15h 10m 46.55s , +69d 59m 29.9s) |   C |    60 | 18.3 |        
   43061 | 2024-02-09 18:16:30 |      MASTER-Tavrida | (15h 20m 40.39s , +69d 19m 56.0s) |   C |    60 | 18.4 |        
   43155 | 2024-02-09 18:18:04 |      MASTER-Tavrida | (15h 13m 30.05s , +71d 54m 42.8s) |   C |    60 | 18.2 |        
   43247 | 2024-02-09 18:19:36 |      MASTER-Tavrida | (15h 24m 17.86s , +71d 14m 09.7s) |   C |    60 | 18.5 |        
   43340 | 2024-02-09 18:21:10 |      MASTER-Tavrida | (15h 46m 42.96s , +66d 10m 04.0s) |   C |    60 | 18.1 |        
   43434 | 2024-02-09 18:22:43 |      MASTER-Tavrida | (15h 54m 55.46s , +65d 28m 24.2s) |   C |    60 | 17.9 |        
   43878 | 2024-02-09 18:30:08 |      MASTER-Tavrida | (15h 26m 10.11s , +78d 49m 43.6s) |   C |    60 | 18.8 |        
   43968 | 2024-02-09 18:31:38 |      MASTER-Tavrida | (16h 33m 18.02s , +79d 28m 12.2s) |   C |    60 | 18.8 |        
   44059 | 2024-02-09 18:33:09 |      MASTER-Tavrida | (16h 23m 23.73s , +76d 52m 50.8s) |   C |    60 | 18.4 |        
   44150 | 2024-02-09 18:34:39 |      MASTER-Tavrida | (17h 20m 30.50s , +77d 28m 34.9s) |   C |    60 | 18.4 |        
   44239 | 2024-02-09 18:36:09 |      MASTER-Tavrida | (15h 47m 11.69s , +71d 11m 42.8s) |   C |    60 | 18.4 |        
   44331 | 2024-02-09 18:37:40 |      MASTER-Tavrida | (16h 26m 57.56s , +71d 51m 15.2s) |   C |    60 | 18.4 |        
Filter C is a clear (unfiltred) band. 


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