[AAVSO-HEN] GRB070419A: optical observations

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TITLE:   GCN CIRCULAR
NUMBER:  6407
SUBJECT: GRB070419A: optical observations
DATE:    07/05/13 20:24:58 GMT
FROM:    Alexei Pozanenko at IKI, Moscow  <apozanen at iki.rssi.ru>

A. Pozanenko (IKI), A. Shulga, A. Volnova (SAI MSU),  B. Hafizov, I.
Asfandiyarov, M. Ibrahimov (MAO) on behalf of larger GRB follow up
collaboration report:

We observed optical afterglow  of GRB070419A (Stamatikos et al, GCN 6302;
Chornock et al. GCN 6304) with 1.5m telescope of  Maidanak observatory
(MAO).  Several exposures in R-band in seeing ~1 arcsec were obtained on
Apr. 17 between (UT) 15:20 - 16:25.  In a combined image the source at
(J2000) RA= 12 10 58.83 DEC= +39 55 34.06 with an error in both coordinates
of 0.15" is compatible with the coordinates of Chornock et al. (GCN 6304)
and Garnavich et al. (GCN 6406).

A photometry of the afterglow using USNO-A2.0 stars  is following:

T0+ ,      Exposure,  R_mag

0.245 d   11x300 s     22.4 +/- 0.3

Our observation is compatible with global power law decay index 0.9
(Garnavich et al. GCN 6406) suggesting no host galaxy contribution in epoch
of our observation.

The  combined image can be found at
http://grb.rssi.ru/GRB070419A/GRB070419A_AZT22_R.jpg

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