MASTER-Net Official Science Release N3
MASTER
II Kislovodsk GRB091020
MASTER II at Caucas. Evgeniy Gorbovskoy
photo.
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina,
D.Kuvshinov, A.V.Sankovich, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov,
D.Zemnukhov, M. Kornilov
Sternberg Astronomical Institute, Moscow State University, Moscow
Union "Optic"
V.Krushinski, I.Zalozhnih, T.Kopytova
Ural State University, Kourovka
K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok
Irkutsk State University
A. Tlatov, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
S.Sergienko, V.Yurkov
Blagoveschensk Educational State University,
Blagoveschensk
The OT GRB091020 and refernces stars.
The 2 first images in different polarizatios (Eeast-telescope and
West-telescope)
OT Light curve in two polarizations
R FILTER PHOTOMETRY (USNO B R2)
West
Time GRB Mag Error
(hour)
1.02097639 17.93 0.22
1.07643278 17.43 0.09
1.13188834 17.78 0.14
1.18734417 18.03 0.19
1.24280056 17.87 0.15
1.29825584 17.58 0.10
1.35371584 17.94 0.12
POLARIZATION UNFILTERED IMAGES PHOTOMETRY (USNO B R2)
West
Time GRB Mag Error
(hour)
1.604558 18.65 0.10
1.983004 18.91 0.08
2.285582 19.04 0.08
2.562864 19.28 0.11
2.84015 19.36 0.09
3.117435 19.32 0.08
3.394721 19.35 0.06
3.672004 19.23 0.10
3.949285 20.07 0.16
4.226602 20.67 0.28
4.503883 20.07 0.22
East
Time GRB Mag Error
(hour)
1.604718 18.60 0.06
1.983232 18.46 0.06
2.285826 19.14 0.09
2.563109 19.11 0.09
2.84039 19.56 0.10
3.117671 19.38 0.09
3.394954 19.70 0.17
3.672234 19.53 0.11
3.949516 19.92 0.16
4.226796 20.03 0.19
4.50408 19.99 0.16
Using all our polarizated magnitudes we
find that the light curve is very well described by a
single power-law decay with alpha = 1.2 +/- 0.1, that is in good agreement
with next observations (Kann et al., GCN 10076)
F ~T-alpha
Publications
GRB091020 (GCN 10231 | GCN 10052)
TITLE: GCN CIRCULAR
NUMBER: 10231
SUBJECT: GRB 091020: MASTER-Net optical polarization observations
DATE: 09/12/02 19:15:38 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs
E. Gorbovskoy, V. Lipunov, V.Kornilov, A.Belinski, N.Shatskiy, N.Tyurina,
D.Kuvshinov, P.Balanutsa, V.V.Chazov, P.V.Kortunov, A.Kuznetsov,
D.Zemnukhov, M. Kornilov
Sternberg Astronomical Institute, Moscow State University
V.Krushinski, I.Zalozhnih, T.Kopytova
Ural State University, Kourovka
A. Tlatov, A.V. Parhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
K.Ivanov, S.Yazev, N.M.Budnev, E.Konstantinov, V.Lenok
Irkutsk State University
S.Sergienko, V.Yurkov
Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru, 2x400
mm, 2x 4 square degrees, 2x16Mpx Apogee CCD) located
at Kislovodsk was pointed to the GRB 091020 (Racusin et al., GCN 10048)
by internet 3422 s after the GRB time. The
large delay was caused with technical problems on site (Gorbovskoy et
al., GCN 10052).
The first 7 images was taken in R-band. The exposure each images is 180s.
West-telescope
GRB Time OT Mag Error
1.02097639 17.93 0.22
1.07643278 17.43 0.09
1.13188834 17.78 0.14
1.18734417 18.03 0.19
1.24280056 17.87 0.15
1.29825584 17.58 0.10
1.35371584 17.94 0.12
The result of the unfiltred polarization combined images is:
West-telescope
GRB Time OT Mag Error
(Hours)
1.604558 18.65 0.10
1.983004 18.91 0.08
2.285582 19.04 0.08
2.562864 19.28 0.11
2.84015 19.36 0.09
3.117435 19.32 0.08
3.394721 19.35 0.06
3.672004 19.23 0.10
3.949285 20.07 0.16
4.226602 20.67 0.28
4.503883 20.07 0.22
East-telescope
GRB Time GRB Error
(Hours)
1.604718 18.60 0.06
1.983232 18.46 0.06
2.285826 19.14 0.09
2.563109 19.11 0.09
2.84039 19.56 0.10
3.117671 19.38 0.09
3.394954 19.70 0.17
3.672234 19.53 0.11
3.949516 19.92 0.16
4.226796 20.03 0.19
4.50408 19.99 0.16
Using all our polarizated magnitudes we
find that the light curve is very well described by a
single power-law decay with alpha = 1.2 +/- 0.1, that is in good agreement
with the following observations (Kann et al., GCN 10076)
The light curve of our observations is available at
http://observ.pereplet.ru/images/GRB091020/grb.html .
The message may be cited.
mailto: lipunov@sai.msu.ru
TITLE: GCN CIRCULAR
NUMBER: 10052
SUBJECT: GRB 091020: MASTER optical transient polarimetry
DATE: 09/10/21 05:15:37 GMT
FROM: Vladimir Lipunov at Moscow State U/Krylov Obs
E. Gorbovskoy,D.Kuvshinov, V. Lipunov, V.Kornilov, D.Kuvshinov,
A.Belinski, A. Krylov, N.Shatskiy, N.Tyurina, P.Balanutsa, V.V.Chazov,
Sternberg Astronomical Institute, Moscow State University
A. Tlatov, A.V. Parkhomenko, D. Dormidontov
Kislovodsk Solar Station of the Pulkovo Observatory
V.Krushinski, I.Zalognikh, T.Kopytova, A. Popov
Ural State University, Kourovka
S.Yazev, K.Ivanov, N.M.Budnev
Irkutsk State University
V.Yurkov
Blagoveschensk Educational State University, Blagoveschensk
MASTER II robotic telescope (MASTER-Net: http://observ.pereplet.ru, 2x400
mm, 8 square degrees, 2x16Mpx Apogee CCD) located
at Kislovodsk was pointed to the GRB 091020 (Racusin et al., GCN 10048)
by internet 3422 s after the GRB time. The
large delay was caused with technical problems on site.
We see bright optical counterpart (~17.5 mag) on the firrst images at UVOT
position.
We have 130 images with 180 sec synchronous exposition each and 19.5
magnitude limit during ~4 hours in two polarization.
The power low decay with alpha ~= 1.3 during 2.5 hours is observed.
This is the preliminary result.
The reduction is continued.
The message may be cited.
mailto: lipunov@sai.msu.ru
mailto: lipunov@sai.msu.ru
