GCN Circular 21132
Subject
GRB 170522A: Global MASTER-Net job
Date
2017-05-23T18:17:37Z (8 years ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, D.Kuvshinov, A.V.Krylov,
I.Gorbunov, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko
Lomonosov Moscow State University, Sternberg Astronomical Institut of MSU
K.Ivanov, S.Yazev, N.M.Budnev, O.Gres, O.Chuvalaev, V.A.Poleshchuk, O.
Ershova
Irkutsk State University
D.Buckley, S. Potter, A.Kniazev, M.Kotze
South African Astronomical Observatory
R.Podesta, C.Lopez, F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) ,
National University of San Juan, Argentina
H. Levato, C. Saffe
Instituto de Ciencias Astronomicas,de la Tierra y del Espacio (ICATE),
San Juan, Argentina
V.Yurkov, Yu.Sergienko
Blagoveschensk Educational State University, Blagoveschensk
A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres
The Instituto de Astrofisica de Canarias
MASTER Tunka robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in Tunka was pointed to the GRB170522A 36 sec after notice time
and 136 sec after trigger time at 2017-05-22 15:47:51 UT. On our first
(30s exposure) set we do not OT within GBM
FERMI error-box (ra=135.417 dec=27.0394 r=1.26 see Stanbro and Meegan
GCN #21126 ) brighter then 16.2.
Unfortunately this observation was outside of the future Fermi LAT
(Arimoto and Racusin, GCN #21127) error box.
Fortunatelly, we have MASTER Very Wide field cameras on all telescopes
(5-10
sec exposure on 2x380 square degrees FOV) and we have images with future
Fermi LAT (Arimoto and Racusin, GCN #21127) error box. There is no OT
brighter ~12 mag inside the future Fermi LAT error box.
The observations made on zenit distance = 66 degrees, galaxy latitude b =
40 degree. The moon (14 % bright part) below the horizon (The altitude of
the Moon is -32 degree ). Observations started at twilight.
The sun altitude is -15.9 degree.
The area can be observed till sunrise at 2017-05-22 21:04:48
MASTER SAAO robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in SAAO was automaticaly starting survey on the FERMI GRB170522A
error-box (ra=09 01 47 dec=+27 07 12 r=1 Fermi GBM error box Stanbro and
Meegan GCN #21126 ) 3186 sec after
notice time and 3740 sec after trigger time at 2017-05-22 16:47:55 UT.
The 5-sigma upper limit on our first (60s exposure) set is about 18.7mag
No OT brighter 19.5 detected in SAAO.
The observations made on zenit distance = 62 degrees, galaxy latitude b =
40 degree.
The moon (14 % bright part) below the horizon (The altitude of the Moon is
-39 degree ).
Observations started at twilight.
The sun altitude is -13.9 degree.
The object can be observed till sunrise at 2017-05-23 05:22:11
Unfortunately this observation was outside of the future Fermi LAT
(Arimoto and Racusin, GCN #21127) error box.
MASTER-OAFA robotic telescope (MASTER-Net: http://observ.pereplet.ru)
located in OAFA automaticaly was pointed to the GRB170522A 247 sec after
FERMI LAT notice time (Arimoto and Racusin, GCN #21127) and 35103
sec after trigger time at 2017-05-23 01:30:38 UT .
But zenit distance was very high and we received dark images.
On our 4-th image (923 sec after FERMI
LAT notice time (Arimoto and Racusin, GCN #21127) and 35779
sec after trigger time at 2017-05-23 01:41:54 UT.) we
found 1 short optical transient within LAT
error-box (ra=139.338 dec=25.67 r=0.19) brighter then 14.5 .
T-Tmid Date Time Expt. Ra Dec Mag
---------|---------------------|-------|-----------------|-----------------|-------
35869 2017-05-23 01:41:54 180 ( 9h 16m 35.3s , +25d 41m 07.4s) 13.72
This object was found only on the one image.
The 5-sigma upper limit has been about 14.5 mag
We did not find OT brighter 18.5 on the next images.
The observations made on zenit distance = 80 degrees, galaxy latitude b =
43 degree. The moon (11 % bright part) below the horizon (The altitude of
the Moon is -63 degree ). The sun altitude is -50.3 degree.
The object can be observed till 2017-05-23 02:44:45 .
The message may be cited.