[AAVSO-HEN] GRB 070520A: Subaru Observations

[grb at aavso.org]

The following is a GCN Circular circulated via the AAVSO network.
For an archive and more information on circulars visit:
http://lheawww.gsfc.nasa.gov/docs/gamcosray/legr/bacodine/gcn3_archive.html

TITLE:   GCN CIRCULAR
NUMBER:  6441
SUBJECT: GRB 070520A: Subaru Observations
DATE:    07/05/21 16:14:41 GMT
FROM:    Nobuyuki Kawai at Tokyo Tech  <nkawai at hp.phys.titech.ac.jp>

T. Hattori, K. Aoki  (Subaru Telescope, NAOJ), and N. Kawai
(Tokyo Tech) report on behalf of the Subaru GRB team:

"We observed the field of GRB 070520A (Romano et al., GCN 6423) with
FOCAS on the Subaru Telescope in the z'-band from 06:32(UT) to
07:27(UT) May 21 with a total exposure of 1920 sec (120s*16) under a
non-photometric condition with occasional clouds.

In the XRT error circle (Romano et al., GCN 6427), we find a possible
afterglow candidate as a low-significance source (1.5 sigma) at 

  RA=12:53:26.52, Dec=74:59:26.6

with a positional uncertainty of 0.4", and a rough estimation of the
magnitude z' ~ 24.

The image may be viewed at
http://www.hp.phys.titech.ac.jp/nkawai/grb/070520A/ "