Erratum: The unusual γ-ray burst GRB 101225A from a helium star/neutron star merger at redshift 0.33

Thöne, C. C.; Postigo, A. de Ugarte; Fryer, Christopher L.; Page, K. L.; Gorosabel, J.; Aloy, M. Á.; Perley, D.; Kouveliotou, C.; Janka, H. T.; Mimica, P.; Racusin, J. L.; Krimm, H. A.; Cummings, J. R.; Oates, S. R.; Holland, S. T.; Siegel, M. H.; Pasquale, M. de; Сонбас, Э.; Im, Myungshin; Park, W.-K.; Канн, Д. А.; Guziy, S.; García, L. Hernández; Llorente, A.; Bundy, Kevin; Choi, Changsu; Jeong, Hyeonju; Korhonen, H.; Kubánek, P.; Lim, Juhee; Москвитин, А. С.; Muñoz-Darias, T.; Pak, Soojong; Parrish, Ian J.

doi:10.1038/nature10817

Cited by 2 publications

(1 citation statement)

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“…Corresponding Author : S. Pak and supernovae (Thöne et al 2011;Lee et al 2010), and young stellar objects (Green et al 2013). The focal reducer was specifically designed to be used with the 2.1 m Otto Struve telescope of McDonald observatory in Texas, US.…”

Section: Introductionmentioning

confidence: 99%

FOCAL REDUCER FOR CQUEAN (Camera for QUasars in EArly uNiverse)

Lim¹,

Chang²,

Pak³

et al. 2013

Journal of The Korean Astronomical Society

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A focal reducer is developed for CQUEAN (Camera for QUasars in EArly uNiverse), which is a CCD imaging system on the 2.1 m Otto Struve telescope at the McDonald observatory. It allows CQUEAN to secure a wider field of view by reducing the effective focal length by a factor of three. The optical point spread function without seeing effects is designed to be within one pixel (0.283 ′′ ) over the field of view of 4.82 ′ × 4.82 ′ in optimum wavelength ranges of 0.8 − 1.1 µm. In this paper, we describe and discuss the characteristics of optical design, the lens and barrel fabrications and the alignment processes. The observation results show that the image quality of the focal reducer confirms the expectations from the design.

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Section: Introductionmentioning

confidence: 99%

FOCAL REDUCER FOR CQUEAN (Camera for QUasars in EArly uNiverse)

Lim¹,

Chang²,

Pak³

et al. 2013

Journal of The Korean Astronomical Society

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How Long Does a Burst Burst?

Zhang

Murase

et al. 2014

ApJ

126

143

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Several gamma-ray bursts (GRBs) last much longer (∼ hours) in γ-rays than typical long GRBs (∼ minutes), and recently it was proposed that these "ultra-long GRBs" may form a distinct population, probably with a different (e.g. blue supergiant) progenitor than typical GRBs. However, Swift observations suggest that many GRBs have extended central engine activities manifested as flares and internal plateaus in X-rays. We perform a comprehensive study on a large sample of Swift GRBs with XRT observations to investigate GRB central engine activity duration and to determine whether ultra-long GRBs are unusual events. We define burst duration t burst based on both γ-ray and X-ray light curves rather than using γ-ray observations alone. We find that t burst can be reliably measured in 343 GRBs. Within this "good" sample, 21.9% GRBs have t burst 10 3 s and 11.5% GRBs have t burst 10 4 s. There is an apparent bimodal distribution of t burst in this sample. However, when we consider an "undetermined" sample (304 GRBs) with t burst possibly falling in the gap between GRB duration T 90 and the first X-ray observational time, as well as a selection effect against t burst falling into the first Swift orbital "dead zone" due to observation constraints, the intrinsic underlying t burst distribution is consistent with being a single component distribution. We found that the existing evidence for a separate ultra-long GRB population is inconclusive, and further multi-wavelength observations are needed to draw a firmer conclusion. We also discuss the theoretical implications of our results. In particular, the central engine activity duration of GRBs is generally much longer than the γ-ray T 90 duration and it does not even correlate with T 90 . It would be premature to make a direct connection between T 90 and the size of the progenitor star.

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Erratum: The unusual γ-ray burst GRB 101225A from a helium star/neutron star merger at redshift 0.33

Abstract: The Acknowledgements of this Letter should have included the following line: ''We thank A. J. Castro-Tirado for help in obtaining the data from the BTA 6-m telescope and comments on an early draft.'' This has been added to the PDF and HTML versions online.

Cited by 2 publications

References 1 publication

FOCAL REDUCER FOR CQUEAN (Camera for QUasars in EArly uNiverse)

FOCAL REDUCER FOR CQUEAN (Camera for QUasars in EArly uNiverse)

How Long Does a Burst Burst?

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