TITLE:   GCN CIRCULAR
NUMBER:  38661
SUBJECT: EP241223a: Global MASTER-Net observations report
DATE:    24/12/24 04:18:27 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

V.Lipunov, E.Gorbovskoy, N.Tiurina,  P.Balanutsa, , D.Vlasenko, I.Panchenko,
A.Kuznetsov,  G.Antipov,  A.Sankovich, A.Sosnovskij, Yu.Tselik, M.Gulyaev, Ya.Kechin,
V.Senik, A.Chasovnikov, K.Labsina, I. Gorbunov (Lomonosov MSU),
O.Gress, N.Budnev (ISU),
C.Francile,  F. Podesta, R.Podesta, E. Gonzalez  (Observatorio Astronomico Felix Aguilar (OAFA),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
A. Gabovich, V.Yurkov (Blagoveschensk Educational StateUniversity)
D.Buckley (SAAO),
R.Rebolo (The Instituto de Astrofisica de Canarias),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez,
A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory) 

MASTER-OAFA robotic telescope  (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L)  located in Argentina (OAFA observatory of San Juan National University) was pointed to the EP241223a ( EP Team et al., GCN 38660) errorbox  101 sec after notice time and 71397 sec after trigger time at 2024-12-24 03:11:20 UT, with upper limit up to  20.8 mag. The observations began at zenith distance = 38 deg. The sun  altitude  is -32.1 deg. 

The galactic latitude b = -20 deg., longitude l = 193 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2720640

We obtain a following upper limits.  

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

   71427 | 2024-12-24 03:11:20 |         MASTER-OAFA | (04h 59m 09.37s , +07d 16m 18.2s) |   C |    60 | 20.2 |        
   71487 | 2024-12-24 03:11:20 |         MASTER-OAFA | (04h 59m 09.36s , +07d 16m 18.2s) |   C |   180 | 20.8 |  Coadd 
   71939 | 2024-12-24 03:19:52 |         MASTER-OAFA | (04h 59m 05.24s , +07d 15m 35.2s) |   C |    60 | 20.2 |        
   72240 | 2024-12-24 03:24:52 |         MASTER-OAFA | (04h 59m 11.13s , +07d 15m 44.4s) |   C |    60 | 20.2 |        
   72552 | 2024-12-24 03:30:05 |         MASTER-OAFA | (04h 59m 12.82s , +07d 15m 17.8s) |   C |    60 | 20.1 |        
   72612 | 2024-12-24 03:30:05 |         MASTER-OAFA | (04h 59m 12.82s , +07d 15m 17.8s) |   C |   180 | 20.7 |  Coadd 
   72863 | 2024-12-24 03:35:16 |         MASTER-OAFA | (04h 59m 08.75s , +07d 15m 15.0s) |   C |    60 | 20.1 |        
   73175 | 2024-12-24 03:40:27 |         MASTER-OAFA | (04h 59m 05.52s , +07d 16m 03.1s) |   C |    60 | 20.1 |        
   73491 | 2024-12-24 03:45:43 |         MASTER-OAFA | (04h 59m 11.16s , +07d 16m 09.8s) |   C |    60 | 20.2 |        
   73551 | 2024-12-24 03:45:43 |         MASTER-OAFA | (04h 59m 11.16s , +07d 16m 09.9s) |   C |   180 | 20.7 |  Coadd 
   73802 | 2024-12-24 03:50:54 |         MASTER-OAFA | (04h 59m 10.61s , +07d 15m 22.2s) |   C |    60 | 20.1 |        
   74122 | 2024-12-24 03:56:14 |         MASTER-OAFA | (04h 59m 07.99s , +07d 15m 34.7s) |   C |    60 | 20.2 |        
   74443 | 2024-12-24 04:01:35 |         MASTER-OAFA | (04h 59m 05.37s , +07d 16m 30.9s) |   C |    60 | 20.2 |        
   74756 | 2024-12-24 04:06:48 |         MASTER-OAFA | (04h 59m 10.24s , +07d 16m 38.3s) |   C |    60 | 20.1 |        
Filter C is a clear (unfiltred) band. 


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