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GCN Circular 36654

Subject
GRB 240529A : MITSuME Akeno optical afterglow detection
Date
2024-06-10T11:17:09Z (3 days ago)
From
Masafumi Niwano at Tokyo Institute of Technology <niwano@hp.phys.titech.ac.jp>
Via
Web form
M. Niwano, I. Takahashi, M. Sasada, N. Higuchi, S. Hayatsu, H. Seki, S. Joshima, Y. Kubo, H. Hagio, Y. Yatsu and N. Kawai (Tokyo Tech) report on behalf of the MITSuME collaboration:

We observed the field of GRB 240529A (Eyles-Ferris et al. GCN 36556) with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno.

The observation with a series of 60 sec exposures started at 2024-05-29 15:11:22 UT (12.2 hrs after the Swift trigger). We stacked the images in good conditions. Then we detected point source in the Ic-band image at the Swift/UVOT position (Eyles-Ferris et al. GCN 36556). Here we report the Ic-band photometry on the image subtracted with a reference image taken at 2024-06-04 (5 days after the trigger), and the 5-sigma upper-limits as follows.

T0+[hrs] | MID-UT | T-EXP[sec] | magnitudes of aperture photometry
----------------------------------------------------------------------------------------------------------------
12.3 | 2024-05-29 16:10:25 | 1080 | g’>18.1, Rc>17.9, Ic=17.5+/-0.2
----------------------------------------------------------------------------------------------------------------
T0+ : Elapsed time after the trigger
T-EXP: Total Exposure time

We used the PS1 catalog for flux calibration. The catalog magnitudes in PS1 g, r and i bands were converted to our g'-, Rc- and Ic-band magnitudes following Tonry et al. (2012), Table 6. The magnitudes are expressed in the AB system. The images were processed in real-time through the MITSuME GPU reduction pipeline (Niwano et al. 2021, PASJ; https://github.com/MNiwano/Eclaire).
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