[vsnet-grb-info 23966] GRB191024A: MASTER optical observation

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  26065
SUBJECT: GRB191024A: MASTER optical observation 
DATE:    19/10/24 10:03:29 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs  <lipunov at xray.sai.msu.ru>

V. Lipunov, E. Gorbovskoy, V.Kornilov, F.Balakin,N.Tyurina,P.Balanutsa,A.Kuznetsov, V.Vladimirov, D. Vlasenko, I.Gorbunov,
D.Zimnukhov,V.Senik, T.Pogrosheva, K.Pozdnyakov,A.Chasovnikov, V.Topolev, D.Kuvshinov(Lomonosov Moscow State University, SAI,Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile(Observatorio Astronomico FelixAguilar OAFA),
H.Levato(Instituto de Ciencias Astronomicas, de la Tierra y del Espacio ICATE),
R. Rebolo, M. Serra(The Instituto de Astrofisica de Canarias),
D. Buckley(South African Astronomical Observatory),
O.A. Gres, N.M. Budnev, O.Ershova(Irkutsk State University, API),
A. Tlatov, D. Dormidontov(Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich, Yu. Sergienko(Blagoveschensk Educational State University)

MASTER-OAFA 
(MASTER Global Robotic 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 SWIFT GRB191024A
(Page et al.GCN #26063, Beardmore et al. GCN 26064 trigger No 931242, XRT R.A.Dec(2000)=00h 40m 27.53s -67d 08' 42.2")
errorbox  37 sec after trigger time at 2019-10-24 04:43:29 UT,
with upper limit up to  14.4 on 10s images (18.2 mag on 1800s sum)
There is no OT on first images.

The observations began at zenith distance = 38 deg. The sun  altitude  was -47.1 deg.

The galactic latitude b = -60 deg., longitude l = 98 deg.

Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/event.php?id=1175693

We obtained the following upper limits:

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

       42 |         MASTER-OAFA |   C |    10 | 14.4 |
       83 |         MASTER-OAFA |   C |    10 | 13.8 |
      131 |         MASTER-OAFA |   C |    20 | 14.5 |
      187 |         MASTER-OAFA |   C |    30 | 14.6 |
      237 |         MASTER-OAFA |   C |   130 | 15.3 |  Coadd
      253 |         MASTER-OAFA |   C |    40 | 14.3 |
      335 |         MASTER-OAFA |   C |    60 | 14.9 |
      436 |         MASTER-OAFA |   C |    80 | 15.6 |
      546 |         MASTER-OAFA |   C |   300 | 16.1 |  Coadd
      558 |         MASTER-OAFA |   C |   100 | 15.2 |
      700 |         MASTER-OAFA |   C |   120 | 15.4 |
      866 |         MASTER-OAFA |   C |   150 | 16.3 |
     1873 |         MASTER-OAFA |   C |  1800 | 17.7 |  Coadd
     6099 |         MASTER-OAFA |   C |  1800 | 18.2 |  Coadd


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