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GCN Circular 9248

Subject

GRB090424: BVRI/R-band detection after 15 hrs burst

Date

2009-04-25T06:52:02Z (15 years ago)

From

Myungshin Im at Seoul Nat U <mim@astro.snu.ac.kr>

M. Im, W. Park, Y. Jeon, I. Lee (CEOU/Seoul National Univ),
  Y.-B. Jeon (KASI) and Y. Urata (NCU) on behalf of EAFON team.

   We took BVRI-band images of GRB090424 (GCN 9223Not found
 
 
)
  using the 1.0m telescope at Mt. Lemmon (Arizona, US)
  operated by the Korea Astronomy Space Science Institute.
   The whole sequence of the observation started at
  2009 April 25, 04:30:19 UT, among which R-band observation
  started at 04:58:32.22.

   From a stacked image of 6 frames (3 min exp. each),
  we cleary detect the afterglow at R=19.9 +- 0.14 mag, calibrated
  against USNO-B1 stars in the vicinity. The mid-point of the
  obseravation is April 25, 05:10:57 UT (14.97 hrs after
  the burst).
   Analysis of the BVI data is ongoing.

   We thank the LOAO operator, J. Yoon for his assistance for this
  observation.