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This page lists all entries on GRB240403A in GRBweb

Summary Fermi GBM GCN 36024 GCN 36031

Summary table
Variable	Value	Source
GRB_name_Fermi	GRB240403498
T0	11:57:30.576 UTC	Fermi_GBM
ra	6.5200°	Fermi_GBM
decl	-17.3000°	Fermi_GBM
pos_error	4.48e+00°	Fermi_GBM
T90	35.585 s	Fermi_GBM
T90_error	0.81 s	Fermi_GBM
T90_start	11:57:34.224 UTC	Fermi_GBM
fluence	3.64e-05 erg/cm²	Fermi_GBM
fluence_error	3.12e-08 erg/cm²	Fermi_GBM
T100	39.233 s
GBM_located	True
mjd	60403.49827055555	Fermi_GBM

Fermi GBM table
GRB_name_Fermi	GRB240403498
trigger_name	bn240403498
ra	6.5200°
decl	-17.3000°
pos_error	4.48e+00°
datum	2024-04-03
t_trigger	11:57:30.576 UTC
T90	35.585 s
T90_error	0.81 s
T90_start	11:57:34.224 UTC
fluence	3.64e-05 erg/cm²
fluence_error	3.12e-08 erg/cm²
flux_1024	3.91e+01 erg/cm²/s
flux_1024_error	3.82e-01 erg/cm²/s
flux_1024_time	2.62e+01 erg/cm²/s
flux_64	4.73e+01 erg/cm²/s
flux_64_error	1.66e+00 erg/cm²/s

GCN 36024 table
GRB_name	GRB240403A
GCN_number	36024
Detection_method	Fermi GBM Det
t_trigger	11:57:30.580 UTC
ra	6.5000°
decl	-17.3000°
Circular_text	TITLE: GCN CIRCULAR NUMBER: 36024 SUBJECT: GRB 240403A: Fermi GBM Detection DATE: 24/04/04 14:27:05 GMT FROM: rachel.hamburg@ijclab.in2p3.fr R. Hamburg (CNRS/IN2P3/IJCLab), S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: "At 11:57:30.58 UT on 03 April 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240403A (trigger 733838255/240403498). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 6.5, Dec = -17.3 (J2000 degrees, equivalent to J2000 +00h 26m, -17d 17'), with a statistical uncertainty of 1.77 degrees. There is additionally a systematic error which we have characterized as a core-plus-tail model, with 90% of GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error (Connaughton et al. 2015, ApJS, 216, 32). The angle from the Fermi LAT boresight is 62 degrees. The GBM light curve shows a precursor, a main emission peak and third weaker peak, yielding a duration (T90) of about 35.6 s (50-300 keV). The time-averaged spectrum from T0-1.2 to T0+76.7 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.11 +/- 0.01 and the cutoff energy, parameterized as Epeak, is 350 +/- 10 keV. A Band function also fits well with Epeak = 322 +/- 14 keV, alpha = -1.08 +/- 0.02, and beta = -2.40 +/- 0.13. The event fluence (10-1000 keV) in this time interval is (3.6 +/- 0.4)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+26 s in the 10-1000 keV band is 39.1 +/- 0.4 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 36031 table
GRB_name	GRB240403A
GCN_number	36031
Detection_method	Fermi GBM Other
Circular_text	TITLE: GCN CIRCULAR NUMBER: 36031 SUBJECT: GRB 240403A: Glowbug gamma-ray detection DATE: 24/04/04 21:35:35 GMT FROM: C.C. Cheung at Naval Research Lab C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report: The Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240403A, which was also detected by Fermi/GBM (GCN 36015, 36024). Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-04-03 11:57:53.912 with a duration of 7.2 s and a total significance of about 31.9 sigma. The Glowbug onset corresponds to the main emission peak seen in the GBM light curve (GCN 36024). The analysis results presented here are preliminary and use a response function that lacks a detailed characterization of the surrounding passive structure of the ISS. Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program’s STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV. [1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959 [2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O [3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006 Distribution Statement A: Approved for public release. Distribution is unlimited.