Skip to main content
Testing. You are viewing the public testing version of GCN. For the production version, go to
Introducing Einstein Probe, Astro Flavored Markdown, and Notices Schema v4.0.0. See news and announcements

GCN Circular 33410

Solar Orbiter STIX observation of GRB 230307A
2023-03-07T20:59:04Z (a year ago)
Hualin Xiao at FHNW <>
Hualin Xiao, S�m Krucker on behalf of the STIX team report:

At 2023-03-07T15:44:09Z UT (Solar Orbiter onboard time), STIX detected GRB 230307A, when Solar Orbiter was 0.53 AU from the earth. The one-way light time between the earth and the Solar Orbiter was 264.46 sec.

The gamma-ray burst signal can be clearly seen in the STIX quick-look light curves in the range between 10 - 84 keV.  The GRB has a single peak and a  duration of about 40 seconds.

The STIX light curves for this GRB can be found here:

By using the light time difference information, we also estimated the possible locations of the GRB.

The result can be found here:

The analysis results presented above are preliminary.  The science data will only be down-linked from the instrument in a month or two.  Detailed analysis of the event will be started after downloading the science data.

The Solar Orbiter (SolO) is a Sun-observing satellite developed by the European Space Agency, it was launched on 10th Feb. 2020.  It has a unique elliptical orbit around the sun, with distances varying from 0.3 - 1 AU. The Spectrometer Telescope for Imaging X-rays (STIX) is one of the ten instruments onboard the Solar Orbiter.  It measures X-rays emitted during solar flares in the energy range of 4 � 150 keV and takes X-ray images by using an indirect imaging technique, based on the Moir� effect.  Its detectors consist of thirty-two pixelated CdTe detectors with a total effective area of 6 cm^2.

More information about STIX can be found on the STIX data center website:
Looking for U.S. government information and services? Visit