[vsnet-grb-info 4740] *****MIMEDefang-SPAM(10.3)***** GRB070520B: optical observations

[GCN Circulars]

TITLE:   GCN CIRCULAR
NUMBER:  6485
SUBJECT: *****MIMEDefang-SPAM(10.3)***** GRB070520B: optical observations
DATE:    07/06/02 16:32:32 GMT
FROM:    Vasilij Rumjantsev at CrAO  <rum at crao.crimea.ua>

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D. Shakhovskoy, V. Rumyantsev (CrAO),  V. Biryukov (CrAO, SAI MSU),
A. Pozanenko (IKI) on behalf of larger GRB follow up collaboration report:

We observed error box of GRB070520B (Moretti et al., GCN 6425) with AZT-11
(1.25m)  telescope of CrAO  in R-band under not optimal weather conditions
(seeing ~3.6 arcsec) on May 20 between (UT)18:47 and 19:21, i.e. starting 1
hour after burst onset. The weather condition No object is found in a
refined XRT error box (Moretti et al., GCN 6438 ). Limiting magnitude of a
combined image is based on USANO A2.0:

Mid time (UT),  Exposure,    R_Lim (3sigma)
May 20.753      6x300        21.0

The combined image can be found in
http://grb.rssi.ru/GRB070520B/GRB070520B_AZT11.gif

This message may be cited.



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Content preview:  D. Shakhovskoy, V. Rumyantsev (CrAO), V. Biryukov (CrAO,
  SAI MSU), A. Pozanenko (IKI) on behalf of larger GRB follow up
  collaboration report: We observed error box of GRB070520B (Moretti et
  al., GCN 6425) with AZT-11 (1.25m) telescope of CrAO in R-band under not
  optimal weather conditions (seeing ~3.6 arcsec) on May 20 between
  (UT)18:47 and 19:21, i.e. starting 1 hour after burst onset. The weather
  condition No object is found in a refined XRT error box (Moretti et al.,
  GCN 6438 ). Limiting magnitude of a combined image is based on USANO
  A2.0: [...] 

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