SN 2024slh is the official name of the supernova discovered by CEFCA scientists using the JST250 telescope. The object is located in the galaxy 2MASX J19382577+6744257. On 19 August, in the process of reviewing and validating the JPCam images taken the previous night, CEFCA scientists found a new light source. That same night the galaxy was observed again with the T80Cam camera of the JAST80 telescope of the Javalambre Astrophysical Observatory. These images confirmed that the new luminous object, detected next to the nucleus of the galaxy, was still visible. The light source was not found in previous images of the galaxy and was therefore determined to be a supernova explosion.

The discovery was reported to the official website of the International Astronomical Union (IAU) for the notification of such discoveries, the Transient Name Server (TNS). A record was made a day later, after the appropriate checks and analyses had been carried out. The supernova, initially named JVAR24b by CEFCA scientists, was registered by the IAU as SN 2024slh.

Supernovae are very rare and difficult to detect phenomena that occur at the end of the life of certain stars. To give an example, a galaxy like ours, with 200 billion stars, only records about 3 supernovae per year, and these are phenomena that are only seen for a few weeks. Sometimes they are the collapse of very massive stars (with masses more than ten times that of the sun) or thermonuclear explosions of stars at a particular stage of their evolution and orbiting a companion star.