THREE YEARS OF
                    <i>FERMI</i>
                    GBM EARTH OCCULTATION MONITORING: OBSERVATIONS OF HARD X-RAY/SOFT GAMMA-RAY SOURCES

Wilson-Hodge, C.; Case, G.; Cherry, M. L.; Rodi, J.; Camero-Arranz, A.; Jenke, P.; Chaplin, V.; Beklen, E.; Finger, Mark H.; Bhat, Narayana P.; Briggs, M. S.; Connaughton, V.; Greiner, J.; Kippen, R. M.; Meegan, C.; Pačiesas, W. S.; Preece, R.; Kienlin, A. von

doi:10.1088/0067-0049/201/2/33

Cited by 38 publications

(31 citation statements)

References 42 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…From the eclipse flux decrement and timing, sources can be identified and located. This technique has been successfully used to find known point sources in the GBM [15].…”

Section: Discussionmentioning

confidence: 99%

Using GBM As Alert For A Galactic Type Ia Supernova

Wang¹,

Fields²,

Lien³

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

View full text Add to dashboard Cite

A Galactic Type Ia Supernova (SNIa) could go entirely unnoticed to us due to the large optical and near-IR extinction in the Milky Way plane, low radio and X-ray luminosities, and a weak neutrino signal. But the recent SN2014J confirms that Type Ia supernovae emit nuclear gamma-ray lines, from the 56 Ni → 56 Co → 56 Fe radioactive decay. The lines last for weeks, and span from 158 keV to 2.6 MeV, squarely within the Fermi Gamma-ray Burst Monitor (GBM) energy range. The Milky Way is optically thin to gamma rays and GBM has continuous and nearly all-sky coverage, therefore the GBM is ideal to serve as a Galactic SNIa monitor and alarm. To illustrate the GBM capabilities, we use a simple model for SNIa gamma-ray emission and transfer to estimate MeV light curves and spectra. Our work is constrained and calibrated by SN2014J MeV data, which suggest ∼ 10% of the 56 Ni is in an optically thin belt surrounding the rest of the initially opaque ejecta. We estimate that the supernova signal emerges as distinct from the GBM background within the first days after the explosion in the SN2014J belt model. Therefore if a Galactic SNIa were to explode, GBM could confirm and sound the alarm possibly even on the first day of the explosion, and localize the SNIa to within ∼1 degree, using the Earth occultation technique.

show abstract

“…From the eclipse flux decrement and timing, sources can be identified and located. This technique has been successfully used to find known point sources in the GBM [15].…”

Section: Discussionmentioning

confidence: 99%

Using GBM As Alert For A Galactic Type Ia Supernova

Wang¹,

Fields²,

Lien³

2016

Proceedings of the 34th International Cosmic Ray Conference — PoS(ICRC2015)

View full text Add to dashboard Cite

show abstract

“…In the energy range corresponding to the GBM NaI detectors (8 keV to 1 MeV), a single step has a finite duration of ∼8 s/ cos β as a source passes behind the Earth's atmosphere Wilson-Hodge et al 2012;Harmon et al 2002). (A derivation of the occultation duration can be found in Appendix B of Harmon et al 2002.)…”

Section: Ideom With Gbmmentioning

confidence: 99%

“…GBM is currently the only instrument performing all-sky observations above ∼200 keV and below the 20 MeV LAT threshold. The Earth occultation technique (EOT) has been applied to the GBM detectors in order to monitor fluxes of known point sources (Wilson-Hodge et al 2012). Over ∼4 years of Earth Occultation analysis, the GBM Earth Occultation team has generated daily updated light curves for the ∼200 sources currently monitored (available at http://heastro.phys.lsu.…”

Section: Introductionmentioning

confidence: 99%

“…Over ∼4 years of Earth Occultation analysis, the GBM Earth Occultation team has generated daily updated light curves for the ∼200 sources currently monitored (available at http://heastro.phys.lsu. edu/gbm/) and published a catalog of high energy (>100 keV) sources ) and a full 3-year catalog of all GBM sources (Wilson-Hodge et al 2012). A particularly surprising result from GBM's continuous all-sky monitoring was the discovery of the variability of the hard X-ray flux from the Crab nebula .…”

Section: Introductionmentioning

confidence: 99%

“…The weighted average scale factor for the source of interest is multiplied by the spectral model flux to determine the final flux. EOT applied to GBM is described in greater detail in Wilson-Hodge et al (2012). This technique is applied to the daily GBM data producing long-term light curves for all the sources in the GBM input catalog.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Earth occultation imaging of the low energy gamma-ray sky with GBM

Rodi

Cherry

Case

et al. 2014

A&A

View full text Add to dashboard Cite

Aims. The Earth Occultation Technique (EOT) has been applied to Fermi's Gamma-ray Burst Monitor (GBM) to perform all-sky monitoring for a predetermined catalog of hard X-ray/soft γ-ray sources. In order to search for sources not in the catalog, thus completing the catalog and reducing a source of systematic error in EOT, an imaging method has been developed -Imaging with a Differential filter using the Earth Occultation Method (IDEOM). Methods. IDEOM is a tomographic imaging method that takes advantage of the orbital precession of the Fermi satellite. Using IDEOM, all-sky reconstructions have been generated for ∼4 years of GBM data in the 12-50 keV, 50-100 keV and 100-300 keV energy bands in search of sources otherwise unmodeled by the GBM occultation analysis. Results. IDEOM analysis resulted in the detection of 57 sources in the 12-50 keV energy band, 23 sources in the 50-100 keV energy band, and 7 sources in the 100-300 keV energy band. Seventeen sources were not present in the original GBM-EOT catalog and have now been added. We also present the first joined averaged spectra for four persistent sources detected by GBM using EOT and by the Large Area Telescope (LAT) on Fermi: NGC 1275, 3C 273, Cen A, and the Crab.

show abstract

Fermi Gamma-Ray Space Telescope

Thompson

McEnery

2022

Handbook of X-Ray and Gamma-Ray Astrophysics

View full text Add to dashboard Cite

THREE YEARS OF FERMI GBM EARTH OCCULTATION MONITORING: OBSERVATIONS OF HARD X-RAY/SOFT GAMMA-RAY SOURCES

Cited by 38 publications

References 42 publications

Using GBM As Alert For A Galactic Type Ia Supernova

Using GBM As Alert For A Galactic Type Ia Supernova

Earth occultation imaging of the low energy gamma-ray sky with GBM

Fermi Gamma-Ray Space Telescope

Contact Info

Product

Resources

About