ERRATUM: “THE ALLEN TELESCOPE ARRAY TWENTY-CENTIMETER SURVEY—A 690 DEG<sup>2</sup>, 12 EPOCH RADIO DATA SET. I. CATALOG AND LONG-DURATION TRANSIENT STATISTICS” (2010, ApJ, 719, 45)

Croft, Steve; Bower, Geoffrey C.; Ackermann, R. F.; Atkinson, Shannon; Backer, D. C.; Backus, P. R.; Barott, William C.; Bauermeister, Amber; Blitz, Leo; Bock, Douglas C.-J.; Bradford, Tucker; Cheng, C.; Cork, C.; Davis, Mike; DeBoer, D.; Dexter, Matt; Dreher, J. W.; Engargiola, G.; Fields, Ed; Fleming, M.; Forster, J. R.; Gutierrez-Kraybill, Colby; Harp, G. R.; Helfer, Tamara T.; Hull, Chat; Jordan, Jane; Jørgensen, Stine; Keating, Garrett K.; Kilsdonk, Tom; Law, Casey J.; Leeuwen, J. van; Lugten, J. B.; MacMahon, Dave; McMahon, Peter L.; Milgrome, O.; Pierson, Tom; Randall, Kevin J.; Ross, John E.; Shostak, Seth; Siemion, Andrew; Smolek, Ken; Tarter, Jill; Thornton, D.; Urry, Lynn; Vitouchkine, Artyom; Wadefalk, Niklas; Welch, Jack; Werthimer, Dan; Whysong, D.; Williams, Peter K. G.; Wright, M. C. H.

doi:10.1088/0004-637x/724/1/827

Cited by 10 publications

(13 citation statements)

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“…Frail et al (2012) present updated limits on the rates of transients based on past radio surveys. They predict that that number of NSM transients per square degrees is approximate two orders of magnitude below the limits of current surveys de Vries et al 2004;Croft et al 2010). However, the blast wave energy they assume, E = 10 50 erg (Nakar & Piran 2011), is more than two orders of magnitude lower than that produced by a long-lived NSM remnant.…”

Section: Discussionmentioning

confidence: 88%

Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts

Metzger

Bower

2013

Monthly Notices of the Royal Astronomical Society

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The coalescence of a binary neutron star (NS) system (a 'NS merger' or NSM) may in some cases produce a massive NS remnant that is long-lived and, potentially, indefinitely stable to gravitational collapse. Such a remnant has been proposed as an explanation for the late X-ray emission observed following some short duration gamma-ray bursts (GRBs) and as possible electromagnetic counterparts to the gravitational wave chirp. A stable NS merger remnant necessarily possesses a large rotational energy ∼ > 10 52 erg, the majority of which is ultimately deposited into the surrounding circumburst medium (CBM) at mildly relativistic velocities. We present Very Large Array (VLA) radio observations of 7 short GRBs, some of which possessed temporally extended X-ray emission, on timescales of ∼ 1−3 years following the initial burst. No radio sources were detected, with typical upper limits ∼ 0.3 mJy at ν = 1.4 GHz. A basic model for the synchrotron emission from the blast wave is used to constrain the presence of a long-lived NSM remnant in each system. Depending on the GRB, our nondetections translate into upper limits on the CBM density n ∼ < 3 × 10 −2 − 3 cm −3 required for consistency with the remnant hypothesis. Our upper limits rule out a long-lived remnant in GRB 050724 and 060505, but cannot rule out such a remnant in other systems due to their lower inferred CMB densities based on afterglow modeling or the lack of such constraints.

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Section: Discussionmentioning

confidence: 88%

Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts

Metzger

Bower

2013

Monthly Notices of the Royal Astronomical Society

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“…9 of Bower et al (2007) and fig. 20 of Croft et al (2010). We do not include a typical timescale of the transient duration in the snapshot rate calculation as it is not well constrained.…”

Section: S U R Fac E D E N S I T Y U P P E R L I M I Tmentioning

confidence: 99%

“…4). In comparison the Croft et al (2010) survey set a 2σ upper limit on the snapshot rate of events >40 mJy to be ρ < 0.004 deg −2 ; by comparing their source fluxes with those in the NVSS catalogues the characteristic time-scale is ∼15 yr (labelled 'Croft2010 T ' in Fig. 4).…”

Section: S U R Fac E D E N S I T Y U P P E R L I M I Tmentioning

confidence: 99%

“…These are some of the brightest transients reported in the literature and so far remain unexplained. Recently Croft et al (2010) published results from the ATA Twenty Centimetre Survey (ATATS): no transients were detected and an upper limit on the snapshot rate of events was given. Subsequently the Pi GHz Sky Survey (PiGSS) surveyed the sky with the ATA at 3.1 GHz, providing the deepest static source catalogue to date above 1.4 GHz (Bower et al 2010).…”

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confidence: 99%

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An automated archival Very Large Array transients survey

Bell

Fender

Swinbank

et al. 2011

Monthly Notices of the Royal Astronomical Society

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In this paper we present the results of a survey for radio transients using data obtained from the Very Large Array archive. We have reduced, using a pipeline procedure, 5037 observations of the most common pointings -i.e. the calibrator fields. These fields typically contain a relatively bright point source and are used to calibrate 'target' observations: they are therefore rarely imaged themselves. The observations used span a time range ∼ 1984 -2008 and consist of eight different pointings, three different frequencies (8.4, 4.8 and 1.4 GHz) and have a total observing time of 435 hours. We have searched for transient and variable radio sources within these observations using components from the prototype LOFAR transient detection system. In this paper we present the methodology for reducing large volumes of Very Large Array data; and we also present a brief overview of the prototype LOFAR transient detection algorithms. No radio transients were detected in this survey, therefore we place an upper limit on the snapshot rate of GHz frequency transients >8.0 mJy to ρ 0.032 deg −2 that have typical timescales 4.3 to 45.3 days. We compare and contrast our upper limit with the snapshot rates -derived from either detections or non-detections of transient and variable radio sources -reported in the literature. When compared with the current Log N -Log S distribution formed from previous surveys, we show that our upper limit is consistent with the observed population. Current and future radio transient surveys will hopefully further constrain these statistics, and potentially discover dominant transient source populations. In this paper we also briefly explore the current transient commissioning observations with LOFAR, and the impact they will make on the field.

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“…A number of papers, many using the first Allen Telescope Array (ATA) results, have recently been published on searches for transient sources (Bower et al 2007;Croft et al 2010;Bower & Saul 2011). Studies of long-term variability are harder to find.…”

Section: Introductionmentioning

confidence: 99%

Millijansky Radio Variability in SDSS Stripe 82

Hodge¹,

Becker²,

White³

et al. 2013

ApJ

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We report on a blind survey for extragalactic radio variability that was carried out by comparing two epochs of data from the FIRST survey with a third epoch from a new 1.4 GHz survey of SDSS Stripe 82. The three epochs are spaced seven years apart and have an overlapping area of 60 deg 2 . We uncover 89 variable sources down to the millijansky level, 75 of which are newly-identified, and we find no evidence for transient phenomena. This new sample of variable sources allows us to infer an upper limit to the mean characteristic timescale of AGN radio variability of 14 years. We find that only 1% of extragalactic sources have fractional variability f var > 3, while 44% of Galactic sources vary by this much. The variable sample contains a larger fraction of quasars than a comparable non-variable control sample, though the majority of the variable sources appear to be extended galaxies in the optical. This implies that either quasars are not the dominant contributor to the variability of the sample, or that the deep optical data allow us to detect the host galaxies of some low-z quasars. We use the new, higher resolution data to report on the morphology of the variable sources. Finally, we show that the fraction of sources that are variable remains constant or increases at low flux densities. This may imply that next generation radio surveys with telescopes like the Australian Square Kilometer Array Pathfinder and MeerKAT will see a constant or even increasing fraction of variable sources down into the submillijansky regime.

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ERRATUM: “THE ALLEN TELESCOPE ARRAY TWENTY-CENTIMETER SURVEY—A 690 DEG², 12 EPOCH RADIO DATA SET. I. CATALOG AND LONG-DURATION TRANSIENT STATISTICS” (2010, ApJ, 719, 45)

Cited by 10 publications

References 0 publications

Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts

Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts

An automated archival Very Large Array transients survey

Millijansky Radio Variability in SDSS Stripe 82

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ERRATUM: “THE ALLEN TELESCOPE ARRAY TWENTY-CENTIMETER SURVEY—A 690 DEG2, 12 EPOCH RADIO DATA SET. I. CATALOG AND LONG-DURATION TRANSIENT STATISTICS” (2010, ApJ, 719, 45)

Cited by 10 publications

References 0 publications

Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts

Constraints on long-lived remnants of neutron star binary mergers from late-time radio observations of short duration gamma-ray bursts

An automated archival Very Large Array transients survey

Millijansky Radio Variability in SDSS Stripe 82

Contact Info

Product

Resources

About

ERRATUM: “THE ALLEN TELESCOPE ARRAY TWENTY-CENTIMETER SURVEY—A 690 DEG², 12 EPOCH RADIO DATA SET. I. CATALOG AND LONG-DURATION TRANSIENT STATISTICS” (2010, ApJ, 719, 45)