Synchrotron Self-Inverse Compton Radiation From Reverse Shock on GRB 120326a

Urata, Y.; Huang, K. Y.; Takahashi, Satoko; Im, Myungshin; Yamaoka, K.; Tashiro, M.; Kim, Jae-Woo; Jang, Min; Pak, Soojong

doi:10.1088/0004-637x/789/2/146

Cited by 33 publications

(40 citation statements)

References 62 publications

(57 reference statements)

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“…It was then detected during the second AMI observation of this event at 7.15 days postburst as seen in Figure 2 (during the early stages of the ALARRM programme the follow-up AMI GRB monitoring observations were not very uniform in time). However, GRB 120326A was detected at very early times at 230 GHz with the Sub-Millimeter Array (SMA; Urata et al 2014) just 0.53 days post-burst, with a flux of 2.84 ± 0.86 mJy/beam, yielding one of the earliest sub-mm detections of a GRB. Using this value and the first AMI limit (at 0.31 days) we can calculate a rough early time lower limit on the spectral index, which was β > +0.6 (for F (ν) ∝ ν β ) at the 4σs level, indicating that self-absorption was playing a role above 15.7 GHz during this time.…”

Section: Grb 120326amentioning

confidence: 99%

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

Anderson

Staley

Horst

et al. 2017

Monthly Notices of the Royal Astronomical Society

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We present the Arcminute Microkelvin Imager (AMI) Large Array catalogue of 139 gamma-ray bursts (GRBs). AMI observes at a central frequency of 15.7 GHz and is equipped with a fully automated rapid-response mode, which enables the telescope to respond to highenergy transients detected by Swift. On receiving a transient alert, AMI can be on-target within two minutes, scheduling later start times if the source is below the horizon. Further AMI observations are manually scheduled for several days following the trigger. The AMI GRB programme probes the early-time (< 1 day) radio properties of GRBs, and has obtained some of the earliest radio detections (GRB 130427A at 0.36 and GRB 130907A at 0.51 days post-burst). As all Swift GRBs visible to AMI are observed, this catalogue provides the first representative sample of GRB radio properties, unbiased by multi-wavelength selection criteria. We report the detection of six GRB radio afterglows that were not previously detected by other radio telescopes, increasing the rate of radio detections by 50% over an 18-month period. The AMI catalogue implies a Swift GRB radio detection rate of 15%, down to ∼ 0.2 mJy/beam. However, scaling this by the fraction of GRBs AMI would have detected in the Chandra & Frail sample (all radio-observed GRBs between 1997 − 2011), it is possible ∼ 44 − 56% of Swift GRBs are radio bright, down to ∼ 0.1 − 0.15 mJy/beam. This increase from the Chandra & Frail rate (∼ 30%) is likely due to the AMI rapid-response mode, which allows observations to begin while the reverse-shock is contributing to the radio afterglow.

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Section: Grb 120326amentioning

confidence: 99%

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

Anderson

Staley

Horst

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…One possibility is that there is a forward shock peak in the UV and a reverse shock peak at low frequencies (similar to GRB 130427A; see Laskar et al 2013;Perley et al 2014d). Another possibility is that there is an inverse Compton peak in the UV (similar to GRB 120326A; Urata et al 2014). …”

Section: Grb 140620a/iptf14cvamentioning

confidence: 99%

THE NEEDLE IN THE 100 deg²HAYSTACK: UNCOVERING AFTERGLOWS OFFERMIGRBs WITH THE PALOMAR TRANSIENT FACTORY

Singer

Kasliwal

Cenko

et al. 2015

ApJ

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The Fermi Gamma-ray Space Telescope has greatly expanded the number and energy window of observations of gamma-ray bursts (GRBs). However, the coarse localizations of tens to a hundred square degrees provided by the Fermi GRB Monitor instrument have posed a formidable obstacle to locating the bursts' host galaxies, measuring their redshifts, and tracking their panchromatic afterglows. We have built a target-of-opportunity mode for the intermediate Palomar Transient Factory in order to perform targeted searches for Fermi afterglows. Here, we present the results of one year of this program: 8 afterglow discoveries out of 35 searches. Two of the bursts with detected afterglows (GRBs 130702A and 140606B) were at low redshift (z = 0.145 and 0.384, respectively) and had spectroscopically confirmed broad-line Type Ic supernovae. We present our broadband follow-up including spectroscopy as well as X-ray, UV, optical, millimeter, and radio observations. We study possible selection effects in the context of the total Fermi and Swift GRB samples. We identify one new outlier on the Amati relation. We find that two bursts are consistent with a mildly relativistic shock breaking out from the progenitor star rather than the ultra-relativistic internal shock mechanism that powers standard cosmological bursts. Finally, in the context of the Zwicky Transient Facility, we discuss how we will continue to expand this effort to find optical counterparts of binary neutron starmergers that may soon be detected by Advanced LIGO and Virgo.

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“…A possible reason for the missing RS component is that the typical reverse shock synchrotron frequency is far below the optical band. As we demonstrated with a rapid SMA ToO observation of GRB120326A (Urata et al 2014), mm/submm observations are the key to catching the RS component and understanding the emission mechanism of GRB afterglows.…”

Section: Grbs With the Gltmentioning

confidence: 88%

First-generation science cases for ground-based terahertz telescopes

Hirashita

Koch

Matsushita

et al. 2015

Publications of the Astronomical Society of Japan

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Ground-based observations at terahertz (THz) frequencies are a newly explorable area of astronomy for the next ten years. We discuss science cases for a first-generation 10-m class THz telescope, focusing on the Greenland Telescope as an example of such a facility. We propose science cases and provide quantitative estimates for each case. The largest advantage of ground-based THz telescopes is their higher angular resolution (∼ 4 arcsec for a 10-m dish), as compared to space or airborne THz telescopes. Thus, high-resolution mapping is an important scientific argument. In particular, we can isolate zones of interest for Galactic and extragalactic star-forming regions. The THz windows are suitable for observations of high-excitation CO lines and [N II] 205 µm lines, which are scientifically relevant tracers of star formation and stellar feedback. Those lines are the brightest lines in the THz windows, so that they are suitable for the initiation of ground-based THz observations. THz polarization of star-forming regions can also be explored since it traces the dust population contributing to the THz spectral peak. For survey-type observations, we focus on "sub-THz" extragalactic surveys, whose uniqueness is to detect galaxies at redshifts z ∼ 1-2, where the dust emission per comoving volume is the largest in the history of the Universe. Finally we explore possibilities of flexible time scheduling, which enables us to monitor active galactic nuclei, and to target gamma-ray burst afterglows. c 2014. Astronomical Society of Japan. 2Publications of the Astronomical Society of Japan, (2014), Vol. 00, No. 0 For these objects, THz and submillimeter wavelength ranges have not yet been explored.

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Synchrotron Self-Inverse Compton Radiation From Reverse Shock on GRB 120326a

Cited by 33 publications

References 62 publications

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

THE NEEDLE IN THE 100 deg²HAYSTACK: UNCOVERING AFTERGLOWS OFFERMIGRBs WITH THE PALOMAR TRANSIENT FACTORY

First-generation science cases for ground-based terahertz telescopes

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Synchrotron Self-Inverse Compton Radiation From Reverse Shock on GRB 120326a

Cited by 33 publications

References 62 publications

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

The Arcminute Microkelvin Imager catalogue of gamma-ray burst afterglows at 15.7 GHz

THE NEEDLE IN THE 100 deg2HAYSTACK: UNCOVERING AFTERGLOWS OFFERMIGRBs WITH THE PALOMAR TRANSIENT FACTORY

First-generation science cases for ground-based terahertz telescopes

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THE NEEDLE IN THE 100 deg²HAYSTACK: UNCOVERING AFTERGLOWS OFFERMIGRBs WITH THE PALOMAR TRANSIENT FACTORY