GRB 101225A - a new class of GRBs?

Thöne, C. C.; Postigo, A. de Ugarte; Fryer, Chris L.; Page, K. L.; Gorosabel, J.; Perley, D.; Aloy, M. Á.; Kouveliotou, C.

doi:10.1017/s1743921312012744

Cited by 4 publications

(4 citation statements)

References 13 publications

(10 reference statements)

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“…Levan et al (2011a) performed spectroscopic observations of the optical source with Gemini/GMOS on March 29, 2011, showing H β and O III emission lines (4959 and 5007 Å, respectively) at a common redshift of z = 0.353. This measurement was rapidly confirmed by independent observations with the Gran Telescopio Canarias (GTC - Thöne et al 2011). At lower energies, several radio detections were also reported: Zauderer et al (2011a) observed with the Expanded Very Large Array (EVLA) at two frequencies (1 GHz bandwidth each) centered at 4.94 and 6.69 GHz.…”

Section: The Sw 1644+57 Transient Eventmentioning

confidence: 59%

Very high energy gamma-ray observation of the peculiar transient event Swift J1644+57 with the MAGIC telescopes and AGILE

Aleksić

Antonelli

Antoranz

et al. 2013

A&A

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Context. On March 28, 2011, the BAT instrument on board the Swift satellite detected a new transient event that in the very beginning was classified as a gamma ray burst (GRB). However, the unusual X-ray flaring activity observed from a few hours up to days after the onset of the event made a different nature seem to be more likely. The long-lasting activity in the X-ray band, followed by a delayed brightening of the source in infrared and radio activity, suggested that it is better interpreted as a tidal disruption event that triggered a dormant black hole in the nucleus of the host galaxy and generated an outflowing jet of relativistic matter. Aims. Detecting a very high energy emission component from such a peculiar object would be enable us to constrain the dynamic of the emission processes and the jet model by providing information on the Doppler factor of the relativistic ejecta . Methods. The MAGIC telescopes observed the peculiar source Swift J1644+57 during the flaring phase, searching for gamma-ray emission at very-high energy (VHE, E > 100 GeV), starting observations nearly 2.5 days after the trigger time. MAGIC collected a total of 28 h of data during 12 nights. The source was observed in wobble mode during dark time at a mean zenith angle of 35• . Data were reduced using a new image-cleaning algorithm, the so-called sum-cleaning, which guarantees a better noise suppression and a lower energy threshold than the standard analysis procedure. Results. No clear evidence for emission above the energy threshold of 100 GeV was found. MAGIC observations permit one to constrain the emission from the source down to 100 GeV, which favors models that explain the observed lower energy variable emission. Data analysis of simultaneous observations from AGILE, Fermi and VERITAS also provide negative detection, which additionally constrain the self-Compton emission component.

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Section: The Sw 1644+57 Transient Eventmentioning

confidence: 59%

Very high energy gamma-ray observation of the peculiar transient event Swift J1644+57 with the MAGIC telescopes and AGILE

Aleksić

Antonelli

Antoranz

et al. 2013

A&A

View full text Add to dashboard Cite

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“…GRB101225A is an unusual GRB (its extragalactic nature has in fact been questioned; Campana et al ), with a gamma‐ray emission exceptionally long followed by a bright X‐ray transient with a hot thermal component and an unusual optical counterpart. We tested its consistency with the correlation assuming the redshift estimate from a possible supernova component in the optical LC (Thöne et al ) and the E pk from the fit of the BAT spectrum (Thöne et al ).

E_{γ, iso}

has been derived from the BAT energy assuming the scaling in fig.…”

Section: The Ex Iso −Eγ Iso −E Pk Correlationmentioning

confidence: 99%

A universal scaling for short and long gamma-ray bursts: EX,iso - Eγ,iso - Epk

Bernardini

Margutti

Zaninoni

et al. 2012

Monthly Notices of the Royal Astronomical Society

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The comprehensive statistical analysis of Swift X‐ray light curves, collecting data from six years of operation, revealed the existence of a universal scaling among the isotropic energy emitted in the rest‐frame 1 ‐ 104 keV energy band during the prompt emission (Eγ, iso ), the peak of the prompt emission energy spectrum (Epk) and the X‐ray energy emitted in the 0.3–10 keV observed energy band (EX, iso). In this paper, we show that this three‐parameter correlation is robust and does not depend on our definition of EX, iso. It is shared by long, short and low‐energetic gamma‐ray bursts (GRBs), and thus reflects the existence of some properties which are shared by the GRB class as a whole. A more intuitive way to express the three‐parameter correlation is in the form of a two‐parameter correlation between the GRB efficiency and Epk. We speculate that the physical origin of such a relation is connected with the outflow Lorentz factor.

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“…GRB101225A is an unusual GRB (its extragalactic nature has been in fact questioned Campana et al 2011), with a gamma-ray emission exceptionally long followed by a bright X-ray transient with a hot thermal component and an unusual optical counterpart. We tested its consistency with the correlation assuming the redshift estimate from a possible supernova component in the optical light curve (Thöne et al 2011) and the E pk from the fit of the BAT spectrum (Thöne et al 2011). Eγ,iso has been derived from the BAT energy assuming the scaling in Fig.…”

Section: The Exiso − Eγiso − Ep K Correlationmentioning

confidence: 99%

A universal scaling for short and long gamma-ray bursts: E_{X,iso}-E_{gamma,iso}-E_{pk}

Bernardini,

Margutti,

Zaninoni

et al. 2012

Preprint

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The comprehensive statistical analysis of Swift X-ray light-curves, collecting data from six years of operation, revealed the existence of a universal scaling among the isotropic energy emitted in the rest frame 10−10 4 keV energy band during the prompt emission (E γ,iso ), the peak of the prompt emission energy spectrum (E pk ), and the X-ray energy emitted in the 0.3 − 10 keV observed energy band (E X,iso ). In this paper we show that this three-parameter correlation is robust and does not depend on our definition of E X,iso . It is shared by long, short, and low-energetic GRBs, differently from the wellknown E γ,iso − E pk correlation. We speculate that the ultimate physical property that regulates the GRB properties is the outflow Lorentz factor.

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GRB 101225A - a new class of GRBs?

Cited by 4 publications

References 13 publications

Very high energy gamma-ray observation of the peculiar transient event Swift J1644+57 with the MAGIC telescopes and AGILE

Very high energy gamma-ray observation of the peculiar transient event Swift J1644+57 with the MAGIC telescopes and AGILE

A universal scaling for short and long gamma-ray bursts: EX,iso - Eγ,iso - Epk

A universal scaling for short and long gamma-ray bursts: E_{X,iso}-E_{gamma,iso}-E_{pk}

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