V. Lipunov, V.Kornilov, N.Tyurina, A.Belinski, D.Kuvshinov, E.Gorbovskoy,
A.Krylov, N.Shatskiy, G.Borisov, A.Sankovich, V.Vladimirov, P.Gritsyk,
Sternberg Astronomical Institute, Moscow Union 'Optic'
In this circular we proposed and tested new method of optical observations
of GRBs by wide field robotic telescopes: survey search of the optical
transient like supurnovae in large error box GRBs or dark not X-ray GRB.
Especially this method is very important for bright short GRB, that
frequently detected by all sky gamma-ray detectors (Konus-Wind,
Ulysses, Odyssey, etc) and for which connection with supernovae is not
The difference between "OT" and "SN" is the following: OT - is the new
optical object without known galaxy. The SN pipe line reduction is based
on the searching of the uncatalogized candidate near known galaxies (for
example from HyperLeda, http://www-obs.univ-lyon1.fr/hypercat/).
MASTER robotic system (http://observ.pereplet.ru, 6 square degrees field)
observed GRB060425 error box (GRB_TIME is 2006-04-25 16:57:40 UT, IPN
triangulation GCN5005) in survey mode at considerable zenit distances.
The weather was good.
We have 4 nights (1-2 hours per night) observations:
Date Days after GRB Note Limit
2006-04-26 1.1 (Lipunov et al.GCN5008) 17.5
2006-04-27 2.1 (Lipunov et al.GCN5026) 17.5
2006-04-30 5.2 17.8
2006-05-03 8.1 17.6
The location of our samples you can find at
The unfiltered image is calibrated relative to USNO A2.0 (0.8 R + 0.2 B).
The robot not find OT brighter then 17.0 in
large IPN error box (J. Cummings, S. Barthelmy et al. GCN5005).
The robot not find SN brighter then 17.5.
Father observations of the GRB050425 not planed.
MASTER team thanks to Konus-Wind team for collaboration. This work is
supported by RFFI 04-02-16411 grant.
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