GCN Circular 33410
Solar Orbiter STIX observation of GRB 230307A
2023-03-07T20:59:04Z (a year ago)
Hualin Xiao at FHNW <firstname.lastname@example.org>
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: https://datacenter.stix.i4ds.net/