LEIA detetced the new X-ray outburst from the neutron star low-mass X-ray binary Aql X-1, which was also reported by XB-NEWS and MAXI (ATel #16147). The position of the LEIA source is R.A. = 287.801 deg, Dec = 0.585 deg with an uncertainty of 1.7 arcmin (radius, 90%C.L. statistical and systematic). 

LEIA has covered the location of Aql X-1 five times since 2023-07-23 T13:31:44. Aql X-1 was first detected by LEIA at 2023-07-23 T15:05:59 with an unabsorbed flux of 1.5e-10 erg cm^-2 s^-1 in 0.5-4 keV (assuming the same spectral shape with that of the next detection), which increased to 5.8e-10 erg cm^-2 s^-1 at 2023-07-26T13:46:39. Its spectrum obtained in the observation at 2023-07-26T13:46:39 can be fitted with an absorbed power-law with fixed Galactic N_H =4.3e21 cm^-2 and a photon index of 1.43(+0.42/-0.41).

The preliminary results have been posted at Astronomer's Telegram as ATel 16158.  Click here for more EP/LEIA Astronomer's Telegrams.