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17 papers · 2 filters
Synchrotron Cooling in Energetic Gamma-Ray Bursts Observed by the Fermi Gamma-Ray Burst Monitor
Hoi-Fung Yu, Jochen Greiner, Hendrik van Eerten +15
We study the time-resolved spectra of eight GRBs observed by Fermi GBM in its first five years of mission, with 1 keV - 1 MeV fluence erg cm and signal-…
High-Resolution X-Ray Spectroscopy of the Bursting Pulsar GRO J1744-28
N. Degenaar, J. M. Miller, F. A. Harrison +3
The bursting pulsar GRO J1744-28 is a Galactic low-mass X-ray binary that distinguishes itself by displaying type-II X-ray bursts: brief, bright flashes of X-ray emission that like…
Circular polarization in the optical afterglow of GRB 121024A
K. Wiersema, S. Covino, K. Toma +37
Gamma-ray bursts (GRBs) are most probably powered by collimated relativistic outflows (jets) from accreting black holes at cosmological distances. Bright afterglows are produced wh…
A broadband X-ray study of the Geminga pulsar with NuSTAR and XMM-Newton
Kaya Mori, Eric V. Gotthelf, Francois Dufour +14
We report on the first hard X-ray detection of the Geminga pulsar above 10 keV using a 150 ks observation with the NuSTAR observatory. The double-peaked pulse profile of non-therma…
Detailed Afterglow Modeling and Host Galaxy Properties of the Dark GRB 111215A
A. J. van der Horst, A. J. Levan, G. G. Pooley +13
Gamma-ray burst (GRB) 111215A was bright at X-ray and radio frequencies, but not detected in the optical or near-infrared (nIR) down to deep limits. We have observed the GRB afterg…
NuSTAR observations of X-ray bursts from the magnetar 1E 1048.1-5937
Hongjun An, Victoria M. Kaspi, Andrei M. Beloborodov +13
We report the detection of eight bright X-ray bursts from the 6.5-s magnetar 1E 1048.1-5937, during a 2013 July observation campaign with the Nuclear Spectroscopic Telescope Array…