GRB event EP260920b detected with a redshift of z=3.582

AI Summary

The Einstein Probe WXT detected a gamma-ray burst (GRB) event on September 20, 2026. Follow-up observations using the VLT/X-shooter revealed a redshift of z=3.582, confirming the event's cosmic origin and high energy output.

Measurements

Notices (1)

Einstein Probe WXT — GRB · Sun, 20 Sep 2026 14:07:19 GMT

GCN Circulars (7)

GCN-45675 — EP260920b · Mon, 21 Sep 2026 09:47:13 GMT
The optical counterpart of the event EP260920b was observed using the VLT/X-shooter spectrograph, revealing a redshift of z = 3.582, indicating the event's high distance and likely significant energy. The spectrum showed various absorption features, confirming the redshift and providing insights into the event's nature.

GCN-45673 — EP260920b · Mon, 21 Sep 2026 09:28:18 GMT
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GCN-45670 — EP260920b · Mon, 21 Sep 2026 06:10:52 GMT
The fast X-ray transient EP260920b was detected by the Einstein Probe (EP) mission, with a main outburst lasting approximately 500 seconds and consisting of two broad pulses. Follow-up observations by the Follow-up X-ray Telescope (FXT) on board EP detected an uncatalogued X-ray source, and further multi-wavelength observations are encouraged.

GCN-45669 — EP260920b · Mon, 21 Sep 2026 04:32:10 GMT
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GCN-45668 — EP260920b · Mon, 21 Sep 2026 02:13:34 GMT
An uncatalogued and decaying optical source, detected within the error circle of EP260920b, is identified as its optical counterpart. The source has a magnitude of 18.97 in the SDSS r' filter and was observed 0.68 hours post-trigger using the LCO 1m telescope network.

GCN-45665 — EP260920b · Mon, 21 Sep 2026 01:09:59 GMT
The MASTER-SAAO robotic telescope in South Africa observed the error box of EP260920b, providing upper magnitude limits of 18.0 in the clear filter. The observations were conducted 38,750 seconds after the trigger time, with the sun at an altitude of -43.7 degrees and a zenith distance of 59 degrees.

GCN-45664 — EP260920b · Mon, 21 Sep 2026 00:42:10 GMT
The Einstein Probe (EP) mission detected an X-ray transient, designated EP260920b, on September 20, 2026. The transient was initially detected by the Wide-field X-ray Telescope (WXT) and later confirmed by the Follow-up X-ray Telescope (FXT), revealing an uncatalogued X-ray source with a precise position.