Grefenstette, Brian

Article from CaltechAUTHORS

Li, S. and Ludlam, R. M., el al. (2026) NuSTAR's Intentional Stray Light Observation of Scorpius X-1; Astrophysical Journal; Vol. 1001; No. 2; 194; 10.3847/1538-4357/ae5898
Brightman, Murray and Jaimes, Joahan Castañeda, el al. (2026) Fast X-Ray Transients in NuSTAR Data; Astrophysical Journal; Vol. 999; No. 1; 75; 10.3847/1538-4357/ae3f31
Paterson, Sarah and Hannah, Iain G, el al. (2026) Quiet Sun impulsive events observed with NuSTAR during solar minimum; Monthly Notices of the Royal Astronomical Society; Vol. 546; No. 4; stag109; 10.1093/mnras/stag109
Hu, Yifan and Brightman, Murray, el al. (2025) Hard X-Ray Emission in AU Mic Flares: A Minor Contributor to Planetary Atmospheric Escape; Astrophysical Journal; Vol. 995; No. 2; 189; 10.3847/1538-4357/ae1971
A. J., Nayana and Margutti, Raffaella, el al. (2025) The Most Luminous Known Fast Blue Optical Transient AT 2024wpp: Unprecedented Evolution and Properties in the X-Rays and Radio; Astrophysical Journal Letters; Vol. 993; No. 1; L6; 10.3847/2041-8213/ae0b4d
Lopez, Fiona and Wik, Daniel R., el al. (2025) Cross Calibration of Galaxy Cluster Temperatures Measured with NuSTAR, XMM-Newton, and Chandra; Astrophysical Journal; Vol. 990; No. 1; 23; 10.3847/1538-4357/adee8f
El Byad, Hamza and Bachetti, Matteo, el al. (2025) A NuSTAR Study of Quasiperiodic Oscillations from the Ultraluminous X-Ray Sources in M82; Astrophysical Journal; Vol. 989; No. 2; 202; 10.3847/1538-4357/aded8a
Grefenstette, B. W. and Brumback, M. C., el al. (2025) NuSTAR Observations of GS 1826-238 in the Extended Soft State; Astrophysical Journal; Vol. 987; No. 2; 180; 10.3847/1538-4357/addf3f
Singer, Leo P. and Criswell, Alexander W., el al. (2025) Optimal Follow-up of Gravitational-wave Events with the UltraViolet EXplorer (UVEX); Publications of the Astronomical Society of the Pacific; Vol. 137; No. 7; 074501; 10.1088/1538-3873/adcfc6
A. J., Nayana and Margutti, Raffaella, el al. (2025) Dinosaur in a Haystack: X-Ray View of the Entrails of SN 2023ixf and the Radio Afterglow of Its Interaction with the Medium Spawned by the Progenitor Star (Paper I); Astrophysical Journal; Vol. 985; No. 1; 51; 10.3847/1538-4357/adc2fb
Criswell, Alexander W. and Leggio, Sydney C., el al. (2025) Electromagnetic Follow-up to Gravitational Wave Events with the UltraViolet EXplorer (UVEX); Publications of the Astronomical Society of the Pacific; Vol. 137; No. 5; 054101; 10.1088/1538-3873/adcd9c
Marcotulli, Lea and Connor, Thomas, el al. (2025) NuSTAR Observations of a Varying-flux Quasar in the Epoch of Reionization; Astrophysical Journal Letters; Vol. 979; No. 1; L6; 10.3847/2041-8213/ad94ee
Xiao, Mengjiao and Carenza, Pierluca, el al. (2022) Betelgeuse constraints on coupling between axionlike particles and electrons; Physical Review D; Vol. 106; No. 12; Art. No. 123019; 10.1103/physrevd.106.123019
Andreoni, Igor and Lu, Wenbin, el al. (2022) Hard X-Ray Observations of the Hydrogen-poor Superluminous Supernova SN 2018hti with NuSTAR; Astrophysical Journal Letters; Vol. 941; No. 1; Art. No. L16; 10.3847/2041-8213/aca593
Sato, Toshiki and Maeda, Keiichi, el al. (2021) High-entropy ejecta plumes in Cassiopeia A from neutrino-driven convection; Nature; Vol. 592; No. 7855; 537-540; 10.1038/s41586-021-03391-9
Lopez, Laura A. and Grefenstette, Brian W., el al. (2020) Evidence of Particle Acceleration in the Superbubble 30 Doradus C with NuSTAR; Astrophysical Journal; Vol. 893; No. 2; Art. No. 144; 10.48550/arXiv.1811.12416
Fabian, A. C. and Buisson, D. J., el al. (2020) The soft state of the black hole transient source MAXI J1820+070: emission from the edge of the plunge region?; Monthly Notices of the Royal Astronomical Society; Vol. 493; No. 4; 5389-5396; 10.1093/mnras/staa564
Glesener, Lindsay and Krucker, Säm, el al. (2020) Accelerated Electrons Observed Down to <7 keV in a NuSTAR Solar Microflare; Astrophysical Journal Letters; Vol. 891; No. 2; Art. No. L34; 10.3847/2041-8213/ab7341
Hare, Jeremy and Tomsick, John A., el al. (2020) NuSTAR Observations of the Transient Galactic Black Hole Binary Candidate Swift J1858.6–0814: A New Sibling of V404 Cyg and V4641 Sgr?; Astrophysical Journal; Vol. 890; No. 1; Art. No. 57; 10.3847/1538-4357/ab6a12
Madsen, K. K. and Fryer, C. L., el al. (2020) NuSTAR Observations of G11.2–0.3; Astrophysical Journal; Vol. 889; No. 1; Art. No. 23; 10.3847/1538-4357/ab54ca
García, Javier A. and Tomsick, John A., el al. (2019) The 2017 Failed Outburst of GX 339-4: Relativistic X-ray Reflection near the Black Hole Revealed by NuSTAR and Swift Spectroscopy; Astrophysical Journal; Vol. 885; No. 1; Art. No. 48; 10.3847/1538-4357/ab384f
Heida, M. and Lau, R. M., el al. (2019) Discovery of a red supergiant donor star in SN2010da/NGC 300 ULX-1; Astrophysical Journal Letters; Vol. 883; No. 2; Art. No. L34; 10.3847/2041-8213/ab4139
Hannah, Iain G. and Kleint, Lucia, el al. (2019) Joint X-ray, EUV and UV Observations of a Small Microflare; Astrophysical Journal; Vol. 881; No. 2; Art. No. 109; 10.3847/1538-4357/ab2dfa
Margutti, R. and Grefenstette, B. W. (2019) An Embedded X-Ray Source Shines through the Aspherical AT 2018cow: Revealing the Inner Workings of the Most Luminous Fast-evolving Optical Transients; Astrophysical Journal; Vol. 872; No. 1; Art. No. 18; 10.3847/1538-4357/aafa01
Fürst, F. and Falkner, S., el al. (2018) Multiple cyclotron line-forming regions in GX 301−2; Astronomy and Astrophysics; Vol. 620; Art. No. A153; 10.1051/0004-6361/201732132
Kosec, P. and Pinto, C., el al. (2018) Evidence for a Variable Ultrafast Outflow in the Newly Discovered Ultraluminous Pulsar NGC 300 ULX-1; Monthly Notices of the Royal Astronomical Society; Vol. 479; No. 3; 3978-3986; 10.1093/mnras/sty1626
Hamaguchi, Kenji and Corcoran, Michael F., el al. (2018) Non-thermal X-rays from colliding wind shock acceleration in the massive binary Eta Carinae; Nature Astronomy; Vol. 2; No. 9; 731-736; 10.1038/s41550-018-0505-1
Walton, D. J. and Bachetti, M., el al. (2018) A Potential Cyclotron Resonant Scattering Feature in the Ultraluminous X-Ray Source Pulsar NGC 300 ULX1 Seen by NuSTAR and XMM-Newton; Astrophysical Journal Letters; Vol. 857; No. 1; Art. No. L3; 10.3847/2041-8213/aabadc
Kuhar, Matej and Krucker, Säm, el al. (2018) NuSTAR Detection of X-Ray Heating Events in the Quiet Sun; Astrophysical Journal Letters; Vol. 856; No. 2; Art. No. L32; 10.3847/2041-8213/aab889
Xu, Yanjun and Harrison, Fiona A., el al. (2018) Reflection Spectra of the Black Hole Binary Candidate MAXI J1535-571 in the Hard State Observed by NuSTAR; Astrophysical Journal Letters; Vol. 852; No. 2; Art. No. L34; 10.3847/2041-8213/aaa4b2
Evans, P. A. and Madsen, K. K., el al. (2017) Swift and NuSTAR observations of GW170817: detection of a blue kilonova; Science; Vol. 358; No. 6370; 1565-1570; 10.1126/science.aap9580
Marsh, Andrew J. and Smith, David M., el al. (2017) First NuSTAR Limits on Quiet Sun Hard X-Ray Transient Events; Astrophysical Journal; Vol. 849; No. 2; Art. No. 131; 10.3847/1538-4357/aa9122
Madsen, Kristin K. and Christensen, Finn E., el al. (2017) Observational artifacts of Nuclear Spectroscopic Telescope Array: ghost rays and stray light; Journal of Astronomical Telescopes, Instruments, and Systems; Vol. 3; No. 4; Art. No. 044003; 10.1117/1.JATIS.3.4.044003
Glesener, Lindsay and Krucker, Säm, el al. (2017) NuSTAR Hard X-Ray Observation of a Sub-A Class Solar Flare; Astrophysical Journal; Vol. 845; No. 2; Art. No. 122; 10.3847/1538-4357/aa80e9
Wright, Paul J. and Hannah, Iain G., el al. (2017) Microflare Heating of a Solar Active Region Observed with NuSTAR, Hinode/XRT, and SDO/AIA; Astrophysical Journal; Vol. 844; No. 2; Art. No. 132; 10.3847/1538-4357/aa7a59
Zhang, Shuo and Baganoff, Frederick K., el al. (2017) Sagittarius A* High Energy X-ray Flare Properties During NuSTAR Monitoring of the Galactic Center from 2012 to 2015; Astrophysical Journal; Vol. 843; No. 2; Art. No. 96; 10.3847/1538-4357/aa74e8
Madsen, Kristin K. and Forster, Karl, el al. (2017) Measurement of the Absolute Crab Flux with NuSTAR; Astrophysical Journal; Vol. 841; No. 1; Art. No. 56; 10.3847/1538-4357/aa6970
Walton, D. J. and Mooley, K., el al. (2017) Living on a Flare: Relativistic Reflection in V404 Cyg Observed by NuSTAR During its Summer 2015 Outburst; Astrophysical Journal; Vol. 839; No. 2; Art. No. 110; 10.3847/1538-4357/aa67e8
Fornasini, Francesca M. and Forster, Karl, el al. (2017) The NuSTAR Hard X-Ray Survey of the Norma Arm Region; Astrophysical Journal Supplement Series; Vol. 229; No. 2; Art. No. 33; 10.3847/1538-4365/aa61fc
Lansbury, G. B. and Harrison, F. A., el al. (2017) The NuSTAR Serendipitous Survey: The 40-month Catalog and the Properties of the Distant High-energy X-Ray Source Population; Astrophysical Journal; Vol. 836; No. 1; Art. No. 99; 10.3847/1538-4357/836/1/99
Kuhar, Matej and Krucker, Säm, el al. (2017) Evidence of Significant Energy Input in the Late Phase of a Solar Flare from NuSTAR X-Ray Observations; Astrophysical Journal; Vol. 835; No. 1; Art. No. 6; 10.3847/1538-4357/835/1/6
Grefenstette, Brian W. and Fryer, Chris L., el al. (2017) The distribution of radioactive ^(44)Ti in Cassiopeia A; Astrophysical Journal; Vol. 834; No. 1; Art. No. 19; 10.3847/1538-4357/834/1/19
Madejski, G. M. and Madsen, K. K., el al. (2016) First NuSTAR observations of the BL Lac-type blazar PKS~2155-304: constraints on the jet content and distribution of radiating particles; Astrophysical Journal; Vol. 831; No. 2; Art. No. 142; 10.3847/0004-637X/831/2/142
Fürst, F. and Walton, D. J., el al. (2016) Discovery of Coherent Pulsations from the Ultraluminous X-Ray Source NGC 7793 P13; Astrophysical Journal Letters; Vol. 831; No. 2; Art. No. L14; 10.3847/2041-8205/831/2/L14
Harrison, F. A. and Baloković, M., el al. (2016) The NuSTAR Extragalactic Surveys: The Number Counts of Active Galactic Nuclei and the Resolved Fraction of the Cosmic X-ray Background; Astrophysical Journal; Vol. 831; No. 2; Art. No. 185; 10.3847/0004-637X/831/2/185
Fürst, F. and Grinberg, V., el al. (2016) Spectro-Timing Study of GX 339-4 in a Hard Intermediate State; Astrophysical Journal; Vol. 828; No. 1; Art. No. 34; 10.3847/0004-637X/828/1/34
Grefenstette, Brian W. and Glesener, Lindsay, el al. (2016) The First Focused Hard X-ray Images of the Sun with NuSTAR; Astrophysical Journal; Vol. 826; No. 1; Art. No. 20; 10.3847/0004-637X/826/1/20
Hong, JaeSub and Mori, Kaya, el al. (2016) NuSTAR Hard X-Ray Survey of the Galactic Center Region. II. X-Ray Point Sources; Astrophysical Journal; Vol. 825; No. 2; Art. No. 132; 10.3847/0004-637X/825/2/132
Rana, Vikram and Loh, Alan, el al. (2016) Characterizing X-ray and Radio emission in the Black Hole X-Ray Binary V404 Cygni during Quiescence; Astrophysical Journal; Vol. 821; No. 2; Art. No. 103; 10.3847/0004-637X/821/2/103
Hannah, Iain G. and Grefenstette, Brian W., el al. (2016) The first X-ray imaging spectroscopy of quiescent solar active regions with NuSTAR; Astrophysical Journal Letters; Vol. 820; No. 1; Art. No. L14; 10.3847/2041-8205/820/1/L14
Krawczynski, Henric S. and Harrison, Fiona A., el al. (2016) X-ray polarimetry with the Polarization Spectroscopic Telescope Array (PolSTAR); Astroparticle Physics; Vol. 75; 8-28; 10.1016/j.astropartphys.2015.10.009
Brightman, Murray and Harrison, Fiona A., el al. (2016) Spectral and Temporal Properties of the Ultraluminous X-Ray Pulsar in M82 from 15 years of Chandra Observations and Analysis of the Pulsed Emission Using NuSTAR; Astrophysical Journal; Vol. 816; No. 2; Art. No. 60; 10.3847/0004-637X/816/2/60
Aird, J. and Harrison, F. A., el al. (2015) The NuSTAR Extragalactic Surveys: First Direct Measurements of the > 10 keV X-Ray Luminosity Function for Active Galactic Nuclei at z > 0.1; Astrophysical Journal; Vol. 815; No. 1; Art. No. 66; 10.1088/0004-637X/815/1/66
Mori, Kaya and Forster, Karl, el al. (2015) NuSTAR Hard X-ray Survey of the Galactic Center Region I: Hard X-ray Morphology and Spectroscopy of the Diffuse Emission; Astrophysical Journal; Vol. 814; No. 2; Art. No. 94; 10.1088/0004-637X/814/2/94
Lopez, Laura A. and Grefenstette, Brian W., el al. (2015) A Spatially Resolved Study of the Synchrotron Emission and Titanium in Tycho's Supernova Remnant with NuSTAR; Astrophysical Journal; Vol. 814; No. 2; Art. No. 132; 10.1088/0004-637X/814/2/132
Madsen, Kristin K. and Fürst, Felix, el al. (2015) 3C 273 with NuSTAR: Unveiling the Active Galactic Nucleus; Astrophysical Journal; Vol. 812; No. 1; Art. No. 14; 10.1088/0004-637X/812/1/14
Tao, Lian and Tomsick, John A., el al. (2015) NuSTAR and Swift observations of the black hole candidate XTE J1908+094 during its 2013 outburst; Astrophysical Journal; Vol. 811; No. 1; Art. No. 51; 10.1088/0004-637X/811/1/51
Madsen, Kristin K. and Harrison, Fiona A., el al. (2015) Calibration of the NuSTAR High-energy Focusing X-ray Telescope; Astrophysical Journal Supplement Series; Vol. 220; No. 1; Art. No. 8; 10.1088/0067-0049/220/1/8
Lansbury, G. B. and Gandhi, P., el al. (2015) NuSTAR Reveals Extreme Absorption in z < 0.5 Type 2 Quasars; Astrophysical Journal; Vol. 809; No. 2; Art. No. 115; 10.1088/0004-637X/809/2/115
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Parker, M. L. and Tomsick, J. A., el al. (2015) NuSTAR and Suzaku observations of the hard state in Cygnus X-1: locating the inner accretion disk; Astrophysical Journal; Vol. 808; No. 1; Art. No. 9; 10.1088/0004-637X/808/1/9
Mukherjee, E. S. and Walton, D. J., el al. (2015) A Hard X-Ray Study of the Ultraluminous X-Ray Source NGC 5204 X-1 with NuSTAR and XMM-Newton; Astrophysical Journal; Vol. 808; No. 1; Art. No. 64; 10.1088/0004-637X/808/1/64
Hayashida, M. and Nalewajko, K., el al. (2015) Rapid Variability of Blazar 3C 279 During Flaring States in 2013-2014 with Joint Fermi-LAT, NuSTAR, Swift, and Ground-Based Multi-Wavelength Observations; Astrophysical Journal; Vol. 807; No. 1; Art. No. 79; 10.1088/0004-637X/807/1/79
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Walton, D. J. and Middleton, M. J., el al. (2015) NuSTAR, XMM-Newton, and Suzaku Observations of the Ultraluminous X-Ray Source Holmberg II X-1; Astrophysical Journal; Vol. 806; No. 1; Art No. 65; 10.1088/0004-637X/806/1/65
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Bachetti, Matteo and Harrison, Fiona A., el al. (2015) No Time for Dead Time: Timing analysis of bright black hole binaries with NuSTAR; Astrophysical Journal; Vol. 800; No. 2; Art. No. 109; 10.1088/0004-637X/800/2/109
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Rana, Vikram R. and Harrison, Fiona A., el al. (2015) The Broadband XMM-Newton and NuSTAR X-ray Spectra of Two Ultraluminous X-ray Sources in the Galaxy IC 342; Astrophysical Journal; Vol. 799; No. 2; Art. No. 121; 10.1088/0004-637X/799/2/121
Walton, D. J. and Harrison, F. A., el al. (2015) NuSTAR and XMM-Newton Observations of the Extreme Ultraluminous X-Ray Source NGC 5907 ULX1: A Vanishing Act; Astrophysical Journal; Vol. 799; No. 2; Art. No. 122; 10.1088/0004-637X/799/2/122
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Chakrabarty, Deepto and Tomsick, John A., el al. (2014) A Hard X-Ray Power-law Spectral Cutoff in Centaurus X-4; Astrophysical Journal; Vol. 797; No. 2; Art. No. 92; 10.1088/0004-637X/797/2/92
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Walton, D. J. and Harrison, F. A., el al. (2014) Broadband X-Ray Spectra of the Ultraluminous X-Ray Source Holmberg IX X-1 Observed with NuSTAR, XMM-Newton, and Suzaku; Astrophysical Journal; Vol. 793; No. 1; Art. No. 21; 10.1088/0004-637X/793/1/21
Wik, Daniel R. and Hornstrup, A., el al. (2014) NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission; Astrophysical Journal; Vol. 792; No. 1; Art. No. 48; 10.1088/0004-637X/792/1/48
Arèvalo, P. and Walton, D. J., el al. (2014) The 2-79 keV X-Ray Spectrum of the Circinus Galaxy with NuSTAR, XMM-Newton, and Chandra: A Fully Compton-thick Active Galactic Nucleus; Astrophysical Journal; Vol. 791; No. 2; Art. No. 81; 10.1088/0004-637X/791/2/81
An, Hongjun and Kaspi, Victoria M., el al. (2014) NuSTAR Observations of X-Ray Bursts from the Magnetar 1E 1048.1–5937; Astrophysical Journal; Vol. 790; No. 1; Art. No. 60; 10.1088/0004-637X/790/1/60
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Nynka, Melania and Hailey, Charles J., el al. (2014) NuSTAR Study of Hard X-Ray Morphology and Spectroscopy of PWN G21.5–0.9; Astrophysical Journal; Vol. 789; No. 1; Art. No. 72; 10.1088/0004-637X/789/1/72
Brenneman, L. W. and Madejski, G., el al. (2014) The Broad-band X-Ray Spectrum of IC 4329A from a Joint NuSTAR/Suzaku Observation; Astrophysical Journal; Vol. 788; No. 1; Art. No. 61; 10.1088/0004-637X/788/1/61
Walton, D. J. and Harrison, F. A., el al. (2014) NuSTAR and XMM-NEWTON Observations of NGC 1365: Extreme Absorption Variability and a Constant Inner Accretion Disk; Astrophysical Journal; Vol. 788; No. 1; Art. No. 76; 10.1088/0004-637X/788/1/76
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Younes, G. and Kouveliotou, C., el al. (2014) Simultaneous NuSTAR/Chandra Observations of the Bursting Pulsar GRO J1744-28 during Its Third Reactivation; Astrophysical Journal; Vol. 804; No. 1; Art. No. 43; 10.1088/0004-637X/804/1/43
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Lansbury, G. B. and Baloković, M., el al. (2014) NuSTAR Observations of Heavily Obscured Quasars at z ~ 0.5; Astrophysical Journal; Vol. 785; No. 1; Art. No. 17; 10.1088/0004-637X/785/1/17
Teng, Stacy H. and Harrison, F. A., el al. (2014) NuSTAR Reveals an Intrinsically X-Ray Weak Broad Absorption Line Quasar in the Ultraluminous Infrared Galaxy Markarian 231; Astrophysical Journal; Vol. 785; No. 1; Art. No. 19; 10.1088/0004-637X/785/1/19
Fryer, Chris L. and Even, Wesley, el al. (2014) Observational constraints of stellar collapse: Diagnostic probes of nature's extreme matter experiment; AIP Advances; Vol. 4; No. 4; Art. No. 041014; 10.1063/1.4870404
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Grefenstette, B. W. and Harrison, F. A., el al. (2014) Asymmetries in core-collapse supernovae from maps of radioactive ^(44)Ti in Cassiopeia A; Nature; Vol. 506; No. 7488; 339-342; 10.1038/nature12997
Brenneman, L. W. and Madejski, G., el al. (2014) Measuring the Coronal Properties of IC 4329A with NuSTAR; Astrophysical Journal; Vol. 781; No. 2; Art. No. 83; 10.1088/0004-637X/781/2/83
Krivonos, Roman A. and Tomsick, John A., el al. (2014) First Hard X-Ray Detection of the Non-thermal Emission around the Arches Cluster: Morphology and Spectral Studies with NuSTAR; Astrophysical Journal; Vol. 781; No. 2; Art. No. 107; 10.1088/0004-637X/781/2/107
Ofek, Eran O. and Harrison, Fiona A., el al. (2014) SN 2010jl: Optical to Hard X-Ray Observations Reveal an Explosion Embedded in a Ten Solar Mass Cocoon; Astrophysical Journal; Vol. 781; No. 1; Art. No. 42; 10.1088/0004-637X/781/1/42
Fürst, Felix and Pottschmidt, Katja, el al. (2014) NuSTAR Discovery of a Luminosity Dependent Cyclotron Line Energy in Vela X-1; Astrophysical Journal; Vol. 780; No. 2; Art. No. 133; 10.1088/0004-637X/780/2/133
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