GRB 240106B
GCN Circular 35492
Subject
GRB 240106B: Fermi GBM Final Real-time Localization
Date
2024-01-06T06:32:05Z (a year ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 06:21:20 UT on 6 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240106B (trigger 726214885.929338 / 240106265).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 239.8, Dec = -22.5 (J2000 degrees, equivalent to J2000 15h 59m, -22d 30'), with a statistical uncertainty of 5.4 degrees.
The angle from the Fermi LAT boresight is 43.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240106265/quicklook/glg_skymap_all_bn240106265.png
The HEALPix FITS file, including the estimated localization systematic, can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240106265/quicklook/glg_healpix_all_bn240106265.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240106265/quicklook/glg_lc_medres34_bn240106265.gif
GCN Circular 35514
Subject
GRB 240106B: Glowbug gamma-ray detection
Date
2024-01-09T22:04:39Z (a year ago)
From
C.C. Cheung at Naval Research Lab <Teddy.Cheung@nrl.navy.mil>
Via
Web form
C.C. Cheung, M. Kerr, J. E. Grove, R. Woolf (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge (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 240106B, which was also detected by Fermi/GBM (GCN #35492).
Using an adaptive window with a resolution of 32-ms, the burst onset is determined to be 2024-01-06 06:21:18.624 with a duration of 6.1 s and a total significance of about 17.5 sigma. The light curve comprises a single peak.
Using a standard power-law function with an exponential high-energy cutoff [3] to model the emission over this duration results in a photon index dN/dE~E^x of x=0.9 and a cutoff energy ("Epeak") of 330 keV. The modeled 10-10000 keV fluence is 1.2e-06 erg/cm^2.
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
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