What was so strange about the July 24 burst, the one that the scientists think might be caused by a black hole swallowing a neutron star, compared to the July 9 burst?

Both on July 9th and July 24th, the scientist thought that a neutron star was swallowed by a black hole. The 24th July burst was much more powerful than the burst oh July 9th. This may be because of the larger mass of the black hole for a powerful explosion.

Burst on the 9th July and 24th July, the afterglow of the X-ray did not fade away but it flares about hundred seconds from the initial burst. But the for the burst on the 24th July, the flare was seen again on half a day later.