GRB 241127.91

D. Buckley
(South African Astronomical Observatory),

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),

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) was pointed to the  GRB241127.91 19 sec after notice time and 35 sec after trigger time at 2024-11-27 21:43:51 UT. On our 3-th (20s exposure)  set , obtained 93 sec after tigger time at 2024-11-27 21:44:49 UT, we  found 1 optical transient within Swift error-box (ra=327.921 dec=-56.685 r=0.05) brighter than  17.4.


 T-Tmid      Date      Time       Expt.        Ra                Dec           Mag
---------|---------------------|-------|-----------------|-----------------|-------
     103   2024-11-27 21:44:49      20   (21h 51m 32.48s , -56d 39m 55.8s)     15.5

The 5-sigma upper limit has been about  17.4mag
The message may be cited.

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-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) was pointed to the Swift GRB241127.91 (trigger No 1270788,21h 51m 41.28s , -56d 41m 06.0s, R=0.05) errorbox  11 sec after notice time and 35 sec after trigger time at 2024-11-27 21:43:51 UT, with upper limit up to  18.3 mag. The observations began at zenith distance = 61 deg. The sun  altitude  is -35.8 deg. 

The galactic latitude b = -47 deg., longitude l = 337 deg.


Real time updated cover map and OT discovered available here: 
https://master.sai.msu.ru/site/master2/observ.php?id=2686277

We obtain a following upper limits.  

Tmid-T0  |          Site       |Filt.| Expt. | Limit| Comment
_________|_____________________|_____|_______|______|________

      41 |         MASTER-SAAO |   C |    10 | 13.0 |        
      56 |         MASTER-SAAO |   C |    40 | 17.9 |  Coadd 
      70 |         MASTER-SAAO |   C |    10 | 17.5 |        
     104 |         MASTER-SAAO |   C |    20 | 17.9 |        
     143 |         MASTER-SAAO |   C |    20 | 16.7 |        
     178 |         MASTER-SAAO |   C |    90 | 18.3 |  Coadd 
     187 |         MASTER-SAAO |   C |    30 | 17.7 |        
     241 |         MASTER-SAAO |   C |    40 | 17.9 |        
     305 |         MASTER-SAAO |   C |    50 | 15.7 |        
     379 |         MASTER-SAAO |   C |    60 | 14.9 |        
Filter C is a clear (unfiltred) band. 


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

C.Francile,  F. Podesta, R.Podesta, E. Gonzalez (Observatorio Astronomico Felix Aguilar (OAFA),
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 (Lomonosov MSU),
O.Gress, N.Budnev(ISU),
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  GRB241127.91 9640 sec after notice time and 9658 sec after trigger time at 2024-11-28 00:24:14 UT. On our 9-th (60s exposure)  set , obtained 10200 sec after tigger time at 2024-11-28 00:33:17 UT, we  found 1 optical transient within Swift error-box (ra=327.921 dec=-56.685 r=0.05) brighter than  19.3.


 T-Tmid      Date      Time       Expt.        Ra                Dec           Mag
---------|---------------------|-------|-----------------|-----------------|-------
   10230   2024-11-28 00:33:17      60   (21h 51m 32.32s , -56d 39m 56.5s)     19.4

The 5-sigma upper limit has been about  19.3mag
The message may be cited.