Fig. 3 | Nature Communications

Fig. 3

From: A luminous blue kilonova and an off-axis jet from a compact binary merger at z = 0.1341

Fig. 3

X-ray observations of GRB150101B. Swift observations (top panel) found a single steady X-ray source. Chandra observations (bottom panel) revealed the presence of two nearby X-ray sources: a brighter constant source at the location of the galaxy nucleus (AGN), and a fainter variable source at the location of the GRB optical counterpart. Its X-ray behavior is consistent with a standard power-law decay (dashed line) or a rising afterglow from either an off-axis jet (solid line) or a cocoon (dot-dashed line). However, the superposition of a constant source with a power-law model violates the early Swift observations. These are instead well described by the superposition of a constant source with a late-peaking afterglow. Vertical error bars are 1 σ. The horizontal gray line shows the average flux level of the AGN

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