Temporal evolution trend (IMAGE)

The University of Hong Kong

Temporal evolution trend

Caption

(b) Temporal evolution trend of the X-ray spectrum of EP250702a. The photon index increased significantly from about 1 in the early phase (indicating a 'hard' spectrum) to above 3 in the later phase (indicating a 'soft' spectrum). This clear 'hard-to-soft' transition, observed for the first time in such an event, suggests the possible emergence of a thermal radiation component at later times. Image credit: Einstein Probe Science Center, National Astronomical Observatories, CAS.

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Einstein Probe Science Center, National Astronomical Observatories, CAS

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