MASTER Official Science Release N2

MASTER VWF4 Kislovodsk GRB081102 prompt optical oservation

The GRB error-box video from northern and southern cameras MASTER VWF4 since 4 minutes before to 4 minutes after BAT trigger time.

Noise path from northern and southern cameras

Coadd 6 set from bosh northern and southern cameras (total 60 sec exosure on each sets) 3 sigma limit is 12.7m

30 sec before GRB	30 sec during GRB	30 sec after GRB

GRB081102 (GCN 8516 | GCN 8471 | GCN 8464) -

TITLE:   GCN CIRCULAR
NUMBER:  8516
SUBJECT: GRB 081102: MASTER refind and final results  
DATE:    08/11/11 15:50:10 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
Sternberg Astronomical Institute, Moscow State University

A. Tlatov, A.Parkhomenko
Kislovodsk Solar Station of the Pulkovo Observatory

V.Krushinski, I.Zalognikh
Ural State University, Kourovka


S.Yazev, K.Ivanov
Irkutsk State University


Two of the four  MASTER Very Wide Field Cameras located at Kislovodsk
(http://apollo.sai.msu.ru/, D=50 mm, 4x1000 square degrees, 35'' per pix)
has 
observed the Swift-BAT GRB081102 error box  (Mangano et al., GCN Circ 
8470, Lipunov et al., GCN 8464, 8471) 
with 5s exposures during all night without time gap between images. There 
are  two  separeted (~702m) mount with double cameras.

Now we present results from the North and South mounts.

These unfiltered images are calibrated relative to Tycho stars (V).
We do not detect any new source at the XRT position
reported in GCN Circ. 8470 (Mangano et al.) brighter than 13.0 
mag before and after trigger time.
The photometry results +-4 min around trigger time:


  T-T_trigger            m_lim (S/N=3)         Exposure         Coadd
  
  -255s... 0... 255 s       11.8                  5s              yes 
  -2min...0...+2 min        12.7                 2x30s             12
  -2min...0...+2 min        13.0                 2x60s             24
  
  The optical fluence during the 40s-GRBurst is limited by
  
       <= 1.6x10_-8 erg/cm_2
       
       
       including 2.8 magnitude  absorbtion (Ukwatta et al., Circ 8462).
       The  BAT-fluence is aboute 2.3x10_-6 erg/cm_2 (15-150 keV) 
       (Fenimore et al., GCN 8468).
       
       So:
       
       Optical Fluence/Gamma-Fluence(15-150keV) ~ < 1/140
       
       Same ratio for GRB080319B is ~ 1/25 (Naked Eye GRB) in 15-150 keV 
       (Racusin, Karpov et al., Nature, vol.455, 183, 2008).
       
       
       Scientific Master Team Report   are available at
       http://observ.pereplet.ru/images/GRB081102/grb_film.html
       
       Note: the GRB was at the edge of the FOW in both cameras.
       The message may be cited.
       
       mailto: lipunov@sai.msu.ru

----------------------------------------------------------------
TITLE:   GCN CIRCULAR
NUMBER:  8471
SUBJECT: GRB 081102: MASTER prompt optical limit
DATE:    08/11/03 20:06:42 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs


MASTER-Net Team (http://observ.pereplet.ru):

V. Lipunov, V.Kornilov,  E.Gorbovskoy,
A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa
Sternberg Astronomical Institute, Moscow State University

A. Tlatov, A.Parkhomenko
Kislovodsk Solar Station of the Pulkovo observatory

V.Krushinski, I.Zalognikh
Ural State University, Kourovka


S.Yazev, K.Ivanov
Irkutsk State University


MASTER Very Wide Field Camera located at Kislovodsk (2000 m)
(http://apollo.sai.msu.ru/, D=50 mm, 4x1000 square degrees, 35'' per pix) 
has observed the Swift-BAT GRB081102 error box  (Ukwatta et al., GCN Circ
8642) 
with 5s exposures during all night without windows between images. 
There are two  separeted (~702m) mount with double cameras.

Now we present results from North camera.

These unfiltered images are calibrated relative to Tycho stars (V).
We do not detect any new source at the XRT position
reported in GCN Circ. 8467 ( Osborne et al.) brighter than 12.4 mag 
before and after trigger time.
The photometry results +-4 min around trigger time:


  T-T_trigger            m_lim (S/N=3)         Exposure         Coadd
  
  -255s... 0... 255 s       11.6                  5s              no 
  -2min...0...+2 min        12.2                 30s               6
  -2min...0...+2 min        12.4                 60s              12
  
  The optical fluence during the 60s-GRburst is limited by <= 6x10_-9 
  erg/cm_2    including 2.5 magnitude  absorbtion (Ukwatta et al., Circ 
  8462). The BAT-fluence is aboute 3 10_-6 erg/cm_2 (15-150 Kev) 
  (http://gcn.gsfc.nasa.gov/notices_s/333427/BA/).
  So
  
  Optical Fluence/Gamma-Fluence ~ < 1/500
  
  Same ratio for GRB080319B is ~ 1/200 (Naked Eye GRB).
  
  The  light curve  is available at
  http://observ.pereplet.ru/images/GRB081102/lc1.png
  
  
  The  video  are available at
  http://observ.pereplet.ru/images/GRB081102/grb.gif
  You can see 200 sets.
  Note: the GRB was at the edge of the FOW.
  
  The reduction is continuing.
  
  mailto: lipunov@sai.msu.ru
  --------------------------------------------------------------------



TITLE:   GCN CIRCULAR
NUMBER:  8464
SUBJECT: GRB 081102: MASTER VWF promt observation 
DATE:    08/11/02 22:34:37 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs


MASTER-Net Team (http://observ.pereplet.ru):

V. Lipunov, V.Kornilov,  E.Gorbovskoy,
A.Belinski, N.Shatskiy, N.Tyurina, D.Kuvshinov, P.Balanutsa
Sternberg Astronomical Institute, Moscow State University

A. Tlatov, I.Golubov
Kislovodsk Solar Station of the Pulkovo observatory

V.Krushinski, I.Zalognikh
Ural State University, Kourovka


S.Yazev, K.Ivanov
Irkutsk State University


MASTER Very Wide Field Camera located at Kislovodsk (2000 m)
(http://apollo.sai.msu.ru/, D=50 mm, 4000 square degrees, 35'' per pix) 
has observed the Swift-BAT GRB081102 error box  (Ukwatta et al., GCN Circ 
8642) with 5s exposures  starting before, during and after the GRB time.

These unfiltered images are calibrated relative to USNO A2.0 (R).
The limit of the each image is aboute 11.1 (S/N=3).

The reduction is continuing.

mailto: lipunov@sai.msu.ru