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This page lists all entries on GRB230709C in GRBweb

Summary Fermi GBM GCN 34187 GCN 34198 GCN 34199 GCN 34201 GCN 34209

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB230709735
T0	17:38:26 UTC	GCN_circulars,Fermi GBM Det
ra	263.5000°	Fermi_GBM
decl	-71.1700°	Fermi_GBM
pos_error	4.60e+00°	Fermi_GBM
T90	0.192 s	Fermi_GBM
T90_error	0.072 s	Fermi_GBM
T90_start	17:38:26.793 UTC	Fermi_GBM
fluence	5.84e-06 erg/cm²	Fermi_GBM
fluence_error	3.19e-08 erg/cm²	Fermi_GBM
T100	0.985 s
GBM_located	True
mjd	60134.73502314815	GCN_circulars,Fermi GBM Det

Fermi GBM table
GRB_name_Fermi	GRB230709735
trigger_name	bn230709735
ra	263.5000°
decl	-71.1700°
pos_error	4.60e+00°
datum	2023-07-09
t_trigger	17:38:26.825 UTC
T90	0.192 s
T90_error	0.072 s
T90_start	17:38:26.793 UTC
fluence	5.84e-06 erg/cm²
fluence_error	3.19e-08 erg/cm²
flux_1024	1.11e+01 erg/cm²/s
flux_1024_error	4.19e-01 erg/cm²/s
flux_1024_time	-1.92e-01 erg/cm²/s
flux_64	5.76e+01 erg/cm²/s
flux_64_error	3.01e+00 erg/cm²/s

GCN 34187 table
GRB_name	GRB230709C
GCN_number	34187
Detection_method	Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34187 SUBJECT: GRB 230709C: BALROG localization (Fermi Trigger 710617111 / GRB 230709735) DATE: 23/07/09 22:19:05 GMT FROM: Jochen Greiner at MPE T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report: The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger 710617111 at 17:38:26 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) = 267.1+/-6.5 deg Decl.(2000.0) = -71.4+/-1.1 deg We estimate an additional systematic error of 1 deg. Further details are available at: https://grb.mpe.mpg.de/grb/GRB230709735/ The Healpix map can be downloaded from: https://grb.mpe.mpg.de/grb/GRB230709735/healpix The location parameters are available as JSON at: https://grb.mpe.mpg.de/grb/GRB230709735/json

GCN 34198 table
GRB_name	GRB230709C
GCN_number	34198
Detection_method	Fermi GBM Other
ra	267.5600°
decl	-70.4700°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34198 SUBJECT: GRB 230709C: Fermi GBM Final Localization DATE: 23/07/10 20:07:49 GMT FROM: Peter Veres at University of Alabama in Huntsville The Fermi GBM team reports the detection of a likely SHORT GRB "At 17:38:26.82 UT on 09 July 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230709C (trigger 710617111/230709735), which initially was classified as a non-GRB trigger by the flight software. The on-ground calculated location, using the Fermi GBM trigger data, is RA = 267.56, Dec = -70.47 (J2000 degrees, equivalent to J2000 17h 50m, -70d 28'), with a statistical uncertainty of 1.44 degrees. The angle from the Fermi LAT boresight is 131 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230709735/quicklook/glg_skymap_all_bn230709735.png The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230709735/quicklook/glg_healpix_all_bn230709735.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2023/bn230709735/quicklook/glg_lc_medres34_bn230709735.gif"

GCN 34199 table
GRB_name	GRB230709C
GCN_number	34199
Detection_method	Fermi GBM Det
t_trigger	17:38:26.820 UTC
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34199 SUBJECT: GRB 230709C: Fermi GBM Detection DATE: 23/07/10 20:12:24 GMT FROM: Peter Veres at University of Alabama in Huntsville P. Veres and C. Meegan (both UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 17:38:26.82 UT on 09 July 2023, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 230709C (trigger 710617111/230709735). The on-ground calculated location, using the Fermi GBM trigger data (GCN #34198) is consistent with the location reported by Preis et al., GCN #34187. The GBM light curve consists of a single emission episode with a duration (T90) of about 0.19 s (50-300 keV). The time-averaged spectrum from T0-0.06 to T0+0.19 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.01 +/- 0.07 and the cutoff energy, parameterized as Epeak, is 1050 +/- 50 keV. The event fluence (10-1000 keV) in this time interval is (6.3 +/- 0.1)E-06 erg/cm^2. The 64-ms peak photon flux measured starting from T0+0.0 s in the 10-1000 keV band is 58 +/- 3 ph/s/cm^2. The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"

GCN 34201 table
GRB_name	GRB230709C
GCN_number	34201
Detection_method	Fermi GBM Det
t_trigger	17:38:26 UTC
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34201 SUBJECT: GRB 230709C: GRBAlpha detection DATE: 23/07/11 07:39:09 GMT FROM: Jakub Ripa 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 short-duration GRB 230709C (Fermi/GBM detection: GCN Circ. 34187; AstroSat detection: GCN Circ. 34191) 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 17:38:26 UTC. The light curve observed by GRBAlpha shows a spike within 1 s bin where the SNR reaches 9 sigma. The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB230709C_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 34209 table
GRB_name	GRB230709C
GCN_number	34209
Detection_method	Swift Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 34209 SUBJECT: GRB 230709C: Swift/BAT-GUANO detection of a short burst outside the coded FOV DATE: 23/07/13 03:09:57 GMT FROM: Samuele Ronchini at PSU Samuele Ronchini (PSU), James DeLaunay (U Alabama), Aaron Tohuvavohu (U Toronto), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report: Swift/BAT did not localize GRB 230709C onboard (T0: 2023-07-09T17:38:26.82 UTC, Fermi trig 710617111) The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1). Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground. The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), performed on the temporal window [T0-20 s, T0+20 s], detects the burst with a sqrt(TS) of 38.3 in a 0.256 s analysis time bin, starting at T0-0.064. NITRATES results are consistent with a burst coming from outside the FOV, with DeltaLLHOut of -32.55 and are consistent with Fermi GBM's localization (GCN 34198). See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretation of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut. GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches. A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/