On classical uniformization theorems for higher dimensional complex Kleinian groups

Cano, Angel; Loeza, Luis; Ucan-Puc, Alejandro

doi:10.48550/arxiv.1609.07541

Cited by 1 publication

(2 citation statements)

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“…All GRBs that meet the above criteria are long, including four ultra-long GRBs: GRB 111209A, GRB 121027A, GRB 130925A and GRB 141121A. The sample also includes six GRBs with associated SN as reported in Cano et al (2016) (GRB 111209A, GRB 111228A, GRB 120422A, GRB 120729A, GRB 130427A, GRB 150818A) and one GRB with a hint of a SN bump in the late optical light curve: GRB 151027A (Nappo et al 2017). Out of these bursts, GRB 130427A was excluded from further analysis since it was observed during an attitude anomaly of the spacecraft.…”

Section: Sample Selectionmentioning

confidence: 99%

“…Gamma-ray bursts (GRBs) are very energetic explosions in distant galaxies.They are divided into two categories based on the duration of their gamma-ray emission: short with duration shorter than 2 s and long with duration longer than 2 s. Long GRBs are connected with the core-collapse of a massive star. Spectroscopic signatures of SNe have been observed together with GRBs and a number of spectroscopic and photometric connections between the two phenomena have been made (for review see e.g., Cano et al 2016). All of the SNe connected with GRBs up to date are of Type Ic broad-lined with signatures of neither H nor He.…”

Section: Introductionmentioning

confidence: 99%

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Thermal components in the early X-ray afterglows of GRBs: likely cocoon emission and constraints on the progenitors

Valan

Larsson

Ahlgren

2017

Monthly Notices of the Royal Astronomical Society

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The early X-ray afterglows of gamma-ray bursts (GRBs) are usually well described by absorbed power laws. However, in some cases, additional thermal components have been identified. The origin of this emission is debated, with proposed explanations including supernova shock breakout, emission from a cocoon surrounding the jet, as well as emission from the jet itself. A larger sample of detections is needed in order to place constraints on these different models. Here we present a time-resolved spectral analysis of 74 GRBs observed by Swift XRT in a search for thermal components. We report six detections in our sample, and also confirm an additional three cases that were previously reported in the literature. The majority of these bursts have a narrow range of blackbody radii around ∼ 2 × 10 12 cm, despite having a large range of luminosities (L peak ∼ 10 47 − 10 51 erg s −1 ). This points to an origin connected to the progenitor stars, and we suggest that emission from a cocoon breaking out from a thick wind may explain the observations. For two of the bursts in the sample, an explanation in terms of late prompt emission from the jet is instead more likely. We also find that these thermal components are preferentially detected when the X-ray luminosity is low, which suggests that they may be hidden by bright afterglows in the majority of GRBs.

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Section: Sample Selectionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%