TITLE: GCN GRB OBSERVATION REPORT NUMBER: 2743 SUBJECT: GRB040924 : Optical candidate observations at Lulin observatory DATE: 04/09/25 10:04:48 GMT FROM: Kuiyun Huang at IANCU This is a multi-part message in MIME format. ------=_NextPart_000_00D2_01C4A32A.2491DEF0 Content-Type: text/plain; charset="big5" Content-Transfer-Encoding: quoted-printable GRB040924 : Optical candidate observations at Lulin observatory J.H. Hu, H.C. Lin (NCU) K.Y. Huang, Y. Urata, W.H. Ip, T. Tamagawa=20 on behalf of Lulin GRB collaboration report: 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). =20 Based on our preliminary analysis, the optical candidate was detected. The position of the candidate referenced to the USNO-B1.0 are=20 RA =3D 02:06:22.52, Dec =3D 16:06:48.5 (J2000) with uncertainties of approximately 0.2".=20 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." This message maybe cited. ------=_NextPart_000_00D2_01C4A32A.2491DEF0 Content-Type: text/html; charset="big5" Content-Transfer-Encoding: quoted-printable GRB040924 : Optical candidate observations at = Lulin=20 observatory

J.H. Hu, H.C. Lin (NCU)
K.Y. Huang, Y. Urata, W.H. = Ip, T.=20 Tamagawa
on behalf of Lulin GRB collaboration = report:

 We have=20 observed the optical candidate of GRB040924 reported by Fox
et al. = (GCN 2734)=20 with 1-m telescope at Lulin Observatory ( National
Central = University,=20 Taiwan). We made B, V, R and I-band imaging
observations starting at = 14.31 UT=20 (2.3 hrs after the burst). 
 Based on our preliminary = analysis,=20 the optical candidate was
detected. The position of the candidate = referenced=20 to the USNO-B1.0
are

 RA =3D 02:06:22.52, Dec =3D = 16:06:48.5=20 (J2000)

 with uncertainties of approximately 0.2". =

The=20 R-band magnitude at 18.67 UT (6.7 hrs after the burst) is 21.4
mag. = compared=20 with near USNO-B1.0 stars as photometric = references.

 Further=20 analysis are in progress."

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