Optical brightening of MAXI J1807+132
ATel #16128; M. Sasada, H. Takei, I. Takahashi, M. Niwano, S. Sato, N. Higuchi, S. Hayatsu, H. Seki, Y. Yatsu, and N. Kawai (TokyoTech), K. L. Murata (Kyoto U) report on behalf of the MITSuME collaboration
on 12 Jul 2023; 09:00 UT
Credential Certification: Katsuhiro Murata (murata@hp.phys.titech.ac.jp)
Subjects: Optical, Binary, Neutron Star, Transient
Referred to by ATel #: 16185
We report optical observation of the transient low-mass X-ray binary MAXI J1807+132.
The object was reported to be reactivated in the optical and X-ray bands (ATel #16119, #16125).
We observed this object on 2023 July 11th with the optical three color (g', Rc, and Ic) CCD cameras attached to the MITSuME 50 cm telescope Akeno and Okayama. The object was detected in g'-, Rc- and Ic-band images.
We performed an aperture photometry and obtained the preliminary magnitudes as follows:
g'=16.52+/-0.09, Rc=16.28+/-0.05, Ic=16.03+/-0.08 on 2023-07-11 (MJD 60136.509406).
We used the PS1 catalog for flux calibration. 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, Vol.73, Issue 1, Pages 4-24; https://github.com/MNiwano/Eclaire).
We will continue simultaneous multi-color observation with the MITSuME 50cm telescopes. Multiwavelength follow-up observations are encouraged.
