TITLE:   GCN CIRCULAR
NUMBER:  38161
SUBJECT: GRB 241018A: cubesat Avion detection
DATE:    24/11/11 09:51:18 GMT
FROM:    Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>

A. Bogomolov, V. Bogomolov, A. Iyudin, S. Svertilov, N. Vasil’ev
on behalf of the MSU “Sozvezdie-270” team, report:

At 2024-10-18 11:54:37 UT the long-duration GRB 241018A
(SVOM detection: GCN #37812; Konus-Wind detection: GCN #37832)
was detected by the cubesat Avion of the Moscow University project “Constellation-270” [1].

Total amount of photons detected by Avion in the energy band 40-500 keV is 234,
it corresponds to a fluence of 1*10^(-6) erg/cm^2.

The LC in the energy band 40-500 keV has two main peaks with maximal flux 7.4phot/(cm^2*s)
in the 1st peak and 8.4 phot/(cm^2*s) in the 2nd peak.

Total duration (T90) of the burst is 7 s.
The light curve obtained by Avion is available here:
https://swx.sinp.msu.ru/models/grb_cat/data/pictures/GRB_241018A_Avion_DeCoR1_LC_final_engl_s.png

Parameters of GRB 241018A as well as 20 other GRBs detected by Moscow University cubesats
are listed at: https://swx.sinp.msu.ru/models/grb_cat/grb.php?lang=en

Avion is one of 5 cubesats of the Lomonosov MSU project “Constellation-270” [1]
launched on 2023 June 27. The payload of Avion is a set of scintillation gamma-ray
detectors DeCoR [2], the energy range is &gt;30 keV, the time resolution is 0.5s.

[1] Svertilov et al. 2023  https://link.springer.com/chapter/10.1007/978-3-031-50248-4_21
[2] Bogomolov et al. 2022 Universe 8, 282 https://www.mdpi.com/2218-1997/8/5/282