TITLE:   GCN CIRCULAR
NUMBER:  38485
SUBJECT: GRB 241114B: cubesat Avion detection
DATE:    24/12/09 08:26:52 GMT
FROM:    Andrey Bogomolov at Moscow State University <aabboogg@srd.sinp.msu.ru>

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

At 2024-11-14 ~11:05:04 UT the long-duration GRB 241114B (Insight-HXMT/HE detection: GCN #38284; Konus-Wind detection: GCN #38398) was detected by the DeCoR-1 and DeCoR-3 instruments on the cubesat Avion of the Moscow University project “Constellation-270” [1].
  
Total amount of photons detected by Avion is 220 (DeCoR-1, energy band 40-500 keV) and ~145 (DeCoR-3, >30 keV), it corresponds to a fluence of ~9*10^(-7) erg/cm^2 in the range 40-500 keV.

LC in the energy range of 40-500 keV has three main episodes with a maximum flux of ~1.2 phot/(cm^2*s) in the 1st peak with a duration of ~6 s, ~2.7 phot/(cm^2*s) in the 2nd peak with a duration of 2 s and 7.7 phot/(cm^2*s) in the 3rd peak with a duration of 2.5 s.
А total duration (T90) of the burst in ~25 s.

The light curve obtained by Avion is available here:
https://swx.sinp.msu.ru/models/grb_cat/data/pictures/2024_11_14_Avion_LC_s.png

Parameters of GRB 241114B as well as 22 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 Moscow University 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 >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