161 citations · 670 across the 18 of their papers we have counts for
18 papers
On the risk of fatigue failure of structural elements exposed to bottom wave slamming -- Impulse response regime
Romain Hascoët, Nicolas Jacques
This study aims to investigate whether fatigue damage induced by bottom wave slamming can be a failure mode important to consider when sizing a marine structural element. The body…
X-ray flares from dense shells formed in gamma-ray burst explosions
R. Hascoet, A. M. Beloborodov, F. Daigne +1
Bright X-ray flares are routinely detected by the Swift satellite during the early afterglow of gamma-ray bursts, when the explosion ejecta drives a blast wave into the external me…
Shocks in nova outflows. I. Thermal emission
Brian D. Metzger, Romain Hascoet, Indrek Vurm +4
Evidence for shocks in nova outflows include (1) multiple velocity components in the optical spectra; (2) keV X-ray emission weeks to months after the outburst; (3) early radio fla…
Phase-resolved X-ray spectra of magnetars and the coronal outflow model
R. Hascoet, A. M. Beloborodov, P. R. den Hartog
We test a model recently proposed for the persistent hard X-ray emission from magnetars. In the model, hard X-rays are produced by a decelerating electron-positron flow in the clos…
The prompt-early afterglow connection in gamma-ray bursts: implications for the early afterglow physics
R. Hascoet, F. Daigne, R. Mochkovitch
The early X-ray afterglow of gamma-ray bursts revealed by Swift carried many surprises. We focus in this paper on the plateau phase whose origin remains highly debated. We confront…
NuSTAR observations of magnetar 1E 1841-045
Hongjun An, Romain Hascoet, Victoria M. Kaspi +18
We report new spectral and temporal observations of the magnetar 1E 1841-045 in the Kes 73 supernova remnant obtained with the Nuclear Spectroscopic Telescope Array (NuSTAR). Combi…
The prompt-early afterglow connection in GRBs
R. Mochkovitch, F. Daigne, R. Hascoet
We study the observed correlations between the duration and luminosity of the early afterglow plateau and the isotropic gamma-ray energy release during the prompt phase. We discuss…
On the origin of GeV emission in gamma-ray bursts
Andrei M. Beloborodov, Romain Hascoet, Indrek Vurm
The most common progenitors of gamma-ray bursts (GRBs) are massive stars with strong stellar winds. We show that the GRB blast wave in the wind should emit a bright GeV flash. It i…
Estimates for Lorentz factors of gamma-ray bursts from early optical afterglow observations
R. Hascoet, A. M. Beloborodov, F. Daigne +1
The peak time of optical afterglow may be used as a proxy to constrain the Lorentz factor Gamma of the gamma-ray burst (GRB) ejecta. We revisit this method by including bursts with…
Evidence for a Photospheric Component in the Prompt Emission of the Short GRB120323A and its Effects on the GRB Hardness-Luminosity Relation
S. Guiriec, F. Daigne, R. Hascoët +12
The short GRB 120323A had the highest flux ever detected with the Fermi/GBM. Here we study its remarkable spectral properties and their evolution using two spectral models: (i) a s…
Dynamics and Afterglow Light Curves of GRB Blast Waves with a Long-lived Reverse Shock
Z. Lucas Uhm, Bing Zhang, Romain Hascoet +3
We perform a detailed study on the dynamics of a relativistic blast wave with the presence of a long-lived reverse shock (RS). Although a short-lived RS has been widely considered,…
The origin of the late rebrightening in GRB 080503
R. Hascoët, F. Daigne, R. Mochkovitch
GRB 080503, detected by Swift, belongs to the class of bursts whose prompt phase consists of an initial short spike followed by a longer soft tail. It did not show any transition t…
Consequences of the gamma-gamma attenuation in GRBs: a detailed study
R. Hascoët, F. Daigne, R. Mochkovitch +1
Recent detections of GeV photons in a few GRBs by Fermi-LAT have led to strong constraints on the bulk Lorentz factor in GRB outflows. To avoid a large gamma-gamma optical depth, m…
Was the "naked burst" GRB 050421 really naked ?
R. Hascoët, Z. L. Uhm, R. Mochkovitch +1
A few long gamma-ray bursts such as GRB 050421 show no afterglow emission beyond the usual initial steep decay phase. It has been suggested that these events correspond to "naked"…
Do Fermi-LAT observations imply very large Lorentz factors in GRB outflows ?
R. Hascoët, F. Daigne, R. Mochkovitch +1
Recent detections of GeV photons in a few GRBs by Fermi-LAT imply huge bulk Lorentz factors to avoid a large gamma gamma optical depth at high energy. Estimates can be as high as G…
A detailed spectral study of GRB 041219A and its host galaxy
D. Gotz, S. Covino, R. Hascoet +4
GRB 041219A is one of the longest and brightest gamma-ray bursts (GRBs) ever observed. It was discovered by the INTEGRAL satellite, and thanks to a precursor happening about 300 s…
Do Fermi-LAT observations really imply very large Lorentz factors in GRB outflows ?
R. Hascoët, V. Vennin, F. Daigne +1
Recent detections of GeV photons in a few GRBs by Fermi-LAT have led to strong constraints on the bulk Lorentz factor in GRB outflows. To avoid a large gamma gamma optical depth, m…
Origin of the bright prompt optical emission in the naked eye burst
R. Hascoët, F. Daigne, R. Mochkovitch
The huge optical brightness of GRB 080319B (the "Naked Eye Burst) makes this event really challenging for models of the prompt GRB emission. In the framework of the internal shock…