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GCN Circular 36515

Subject
Fermi trigger No 737788024: Global MASTER-Net observations report
Date
2024-05-19T18:45:55Z (6 months ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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-SAAO robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB240519.21 (trigger No 737788024,19h 35m 38.40s , -69d 21m 00.0s, R=1.47) errorbox  42773 sec after notice time and 42813 sec after trigger time at 2024-05-19 17:00:32 UT, with upper limit up to  18.0 mag. Observations started at twilight.  The observations began at zenith distance = 75 deg. The sun  altitude  is -15.6 deg. 

The galactic latitude b = -30 deg., longitude l = 326 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2461773

We obtain a following upper limits.  

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

   42843 | 2024-05-19 17:00:32 |         MASTER-SAAO | (19h 35m 26.18s , -69d 01m 26.6s) |   C |    60 | 15.3 |        
   42937 | 2024-05-19 17:02:06 |         MASTER-SAAO | (19h 57m 55.00s , -69d 02m 57.0s) |   C |    60 | 17.2 |        
   43029 | 2024-05-19 17:03:37 |         MASTER-SAAO | (19h 07m 59.06s , -70d 56m 05.1s) |   C |    60 | 18.0 |        
   43118 | 2024-05-19 17:05:07 |         MASTER-SAAO | (19h 32m 37.84s , -70d 55m 13.9s) |   C |    60 | 18.0 |        
   43207 | 2024-05-19 17:06:36 |         MASTER-SAAO | (19h 20m 13.74s , -67d 09m 16.4s) |   C |    60 | 17.7 |        
   43297 | 2024-05-19 17:08:06 |         MASTER-SAAO | (19h 41m 02.41s , -67d 09m 09.5s) |   C |    60 | 17.7 |        
   43482 | 2024-05-19 17:11:11 |         MASTER-SAAO | (19h 15m 13.89s , -69d 01m 43.9s) |   C |    60 | 18.0 |        
   43805 | 2024-05-19 17:16:33 |         MASTER-SAAO | (19h 35m 24.32s , -69d 01m 39.8s) |   C |    60 | 17.9 |        
   43895 | 2024-05-19 17:18:04 |         MASTER-SAAO | (19h 57m 58.64s , -69d 02m 41.2s) |   C |    60 | 17.9 |        
   43986 | 2024-05-19 17:19:35 |         MASTER-SAAO | (19h 07m 58.91s , -70d 57m 31.4s) |   C |    60 | 18.0 |        
   44076 | 2024-05-19 17:21:05 |         MASTER-SAAO | (19h 32m 44.55s , -70d 57m 32.6s) |   C |    60 | 17.9 |        
   44167 | 2024-05-19 17:22:36 |         MASTER-SAAO | (19h 20m 17.25s , -67d 08m 04.1s) |   C |    60 | 17.8 |        
   44257 | 2024-05-19 17:24:06 |         MASTER-SAAO | (19h 40m 59.92s , -67d 09m 27.0s) |   C |    60 | 17.8 |        
   44438 | 2024-05-19 17:27:07 |         MASTER-SAAO | (19h 15m 07.13s , -69d 02m 50.6s) |   C |    60 | 18.0 |        
   44757 | 2024-05-19 17:32:25 |         MASTER-SAAO | (19h 35m 29.17s , -69d 03m 11.5s) |   C |    60 | 18.0 |        
   44847 | 2024-05-19 17:33:56 |         MASTER-SAAO | (19h 57m 51.76s , -69d 04m 12.2s) |   C |    60 | 17.9 |        
   44938 | 2024-05-19 17:35:27 |         MASTER-SAAO | (19h 08m 01.88s , -70d 57m 48.5s) |   C |    60 | 18.0 |        
   45028 | 2024-05-19 17:36:57 |         MASTER-SAAO | (19h 32m 40.59s , -70d 56m 39.3s) |   C |    60 | 17.9 |        
   45118 | 2024-05-19 17:38:27 |         MASTER-SAAO | (19h 20m 16.03s , -67d 09m 58.0s) |   C |    60 | 17.9 |        
   45208 | 2024-05-19 17:39:57 |         MASTER-SAAO | (19h 41m 01.94s , -67d 08m 31.4s) |   C |    60 | 17.9 |        
   45391 | 2024-05-19 17:43:00 |         MASTER-SAAO | (19h 15m 05.80s , -69d 02m 21.3s) |   C |    60 | 18.0 |        
   45710 | 2024-05-19 17:48:19 |         MASTER-SAAO | (19h 54m 55.54s , -70d 58m 17.4s) |   C |    60 | 18.0 |        
   46438 | 2024-05-19 18:00:27 |         MASTER-SAAO | (19h 59m 34.18s , -67d 10m 04.3s) |   C |    60 | 17.9 |        
   46624 | 2024-05-19 18:03:33 |         MASTER-SAAO | (19h 54m 53.46s , -70d 58m 00.3s) |   C |    60 | 18.0 |        
   47351 | 2024-05-19 18:15:39 |         MASTER-SAAO | (19h 59m 39.53s , -67d 10m 33.1s) |   C |    60 | 17.9 |        
   47532 | 2024-05-19 18:18:41 |         MASTER-SAAO | (19h 54m 52.45s , -70d 59m 26.9s) |   C |    60 | 18.0 |        
   48262 | 2024-05-19 18:30:51 |         MASTER-SAAO | (19h 59m 38.28s , -67d 11m 38.5s) |   C |    60 | 17.9 |        
Filter C is a clear (unfiltred) band. 


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