鹿林天文台觀測到GRB040924 OT


This burst is classified short/soft GRB (not hard but X-ray rich). This is first time to find optical transient for  "short GRB". 

- Yuji Urata <urata@crab.riken.go.jp> 


TITLE: GCN GRB OBSERVATION REPORT ( http://gcn.gsfc.nasa.gov/gcn3/2744.gcn3 )
NUMBER: 2744
SUBJECT: GRB040924 : Optical candidate observations at Lulin observatory
DATE: 04/09/25 10:26:17 GMT
FROM: Kuiyun Huang at IANCU <d919003@astro.ncu.edu.tw>

GRB040924 : Optical candidate observations at Lulin observatory

J.H. Hu, H.C. Lin (NCU)
K.Y. Huang, Y. Urata, W.H. Ip, T. Tamagawa 
on behalf of Lulin GRB collaboration report:

We apologize to send multi-part mesage at last report (GCN 2743). We submit our report again.

We have observed the optical candidate of GRB040924 reported by Fox et al. (GCN 2734) with 1-m telescope at Lulin Observatory ( National Central University, Taiwan). We made B, V, R and I-band imaging observations starting at 14.31 UT (2.3 hrs after the burst).  Based on our preliminary analysis, the optical candidate was detected. The position of the candidate referenced to the USNO-B1.0 are  RA = 02:06:22.52, Dec = 16:06:48.5 (J2000)  with uncertainties of approximately 0.2". 

The R-band magnitude at 18.67 UT (6.7 hrs after the burst) is 21.4 mag. compared with near USNO-B1.0 stars as photometric references.

Further analysis are in progress."

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