GRB 230709B
GCN Circular 34179
Subject
GRB 230709B: BALROG localization (Fermi Trigger 710614579 / GRB 230709706)
Date
2023-07-09T17:19:33Z (2 years ago)
From
Jochen Greiner at MPE <jcgrog@mpe.mpg.de>
B. Biltzinger, T. Preis, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
710614579 at 16:56:14 on 09 July 2023 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position (1 sigma statistical errors) is:
RA(2000.0) = 87.0+/-1.2 deg
Decl.(2000.0) = -3.0+/-0.8 deg
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB230709706/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB230709706/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB230709706/json
GCN Circular 34200
Subject
GRB 230709B: GRBAlpha detection
Date
2023-07-11T07:36:50Z (2 years ago)
From
Jakub Ripa <ripa.jakub@gmail.com>
M. Dafcikova, J. Ripa (Masaryk U.), A. Pal (Konkoly Observatory), N. Werner (Masaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Konkoly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Kolar, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. Povalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipovsky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. Bozoki (Eotvos U.), G. Dalya (Eotvos U.), yyT. Enoto (Kyoto U.), Zs. Frei (Eotvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. Hisadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. Kiss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U.), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo), T. Kano (U. Michigan) -- the GRBAlpha collaboration.
The long-duration GRB 230709B (Fermi/GBM detection: GCN Circ. 34179) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023; arXiv:2302.10048).
The detection was confirmed at the peak time 2023-07-09 16:56:15 UTC. The T90 duration measured by GRBAlpha is 6 s and the overall significance during T90 reaches 9 sigma.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230709B_GCN.pdf
All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/hea/GRBAlpha/ GRBAlpha, launched on 2021 March 22, is a demonstration mission for a future CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GRBAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM array, covering the energy range from ~50 keV to ~1000 keV. To increase the duty cycle and the downlink rate, the upgrade of the on-board data acquisition software stack is in progress. The ground segment is also supported by the radio amateur community and it takes advantage of the SatNOGS network for increased data downlink volume.
GCN Circular 34211
Subject
GRB 230709B: CALET Gamma-Ray Burst Monitor detection
Date
2023-07-13T06:46:38Z (2 years ago)
From
Yuta Kawakubo at Louisiana State University <kawakubo1@lsu.edu>
K. Kobayashi (Waseda U), A. Yoshida, T. Sakamoto,
S. Sugita (AGU), Y. Kawakubo (LSU), K. Yamaoka (Nagoya U),
S. Nakahira (JAXA), Y. Asaoka (ICRR), S. Torii,
Y. Akaike (Waseda U), Y. Shimizu, T. Tamura (Kanagawa U),
N. Cannady (GSFC/UMBC), M. L. Cherry (LSU),
S. Ricciarini (U of Florence), P. S. Marrocchesi (U of Siena),
and the CALET collaboration:
The long GRB 230709B (Fermi-GBM Trigger 710614579;
Fermi-GBM BALROG localization: Biltzinger et al., GCN Circ 34179;
GRBAlpha detection: Dafcikova et al., GCN Circ 34200) was detected
in the ground analysis of the CALET Gamma-ray Burst Monitor (CGBM)
data around 16:56:14.47 UTC on 9 July 2023 (referenced to
Fermi-GBM Trigger 710614579).
The burst signal was seen by HXM1 and SGM.
The burst light curve shows a single pulse that starts
at T+0.3 sec, peaks at T+3.5 sec, and ends at T+11.3 sec.
The T90 and T50 durations measured by the SGM data are
9.9 +/- 0.6 sec and 5.4 +/- 1.1 sec (40-1000 keV), respectively.
The ground-processed light curve is available at
http://cgbm.calet.jp/cgbm_trigger/ground/1372956935/index.html
The CALET data used in this analysis are provided by
the Waseda CALET Operation Center located at Waseda University.