[AAVSO-HEN] GRB 080307: NIR upper limit

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TITLE:   GCN CIRCULAR
NUMBER:  7405
SUBJECT: GRB 080307: NIR upper limit
DATE:    08/03/11 03:24:43 GMT
FROM:    Takeo Minezaki at U.of Tokyo/Astro  <minezaki at mtk.ioa.s.u-tokyo.ac.jp>

T. Minezaki (IoA, Tokyo), P.A. Price (IfA, Hawaii), Y. Yoshii (IoA,
Tokyo), L. Cowie (IfA, Hawaii) and Y. Kakazu (IfA, Hawaii) report:

We observed the localisation of GRB 080307 with the MAGNUM telescope +
MIP dual-beam imager. We do not find any afterglow in the RIYJHK images
within the XRT error circle (GCN #7366), and at the Gemini-N i-band
candidate position (GCN #7369). We estimated the upper limits in JHK
based on flux calibration with a nearby 2MASS star as follows:

  Filter   t - t_GRB (hour)    Limit (mag)
  J        +18.9               20.8
  H        +19.8               20.1
  K        +19.5               19.2

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