[ITAL]Hubble Space Telescope[/ITAL] Space Telescope Imaging Spectrograph Imaging of the Host Galaxy of GRB 980425/SN 1998[CLC]bw[/CLC]

Fynbo, J.; Holland, S. T.; Andersen, M. I.; Thomsen, B.; Hjorth, J.; Björnsson, G.; Jaunsen, A. O.; Natarajan, Pradeep; Tanvir, N. R.

doi:10.1086/312942

Cited by 73 publications

(102 citation statements)

References 27 publications

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“…36. The CBs' contribution dominates at very late time and, remarkably, it is in perfect agreement with the HST observation (Fynbo et al 2000) on day 778 after the GRB.…”

Section: Grb 980425 Is Not Exceptionalsupporting

confidence: 87%

On the optical and X-ray afterglows of gamma ray bursts

Dado

Dar

Rújula

2002

A&A

256

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Abstract. We severely criticize the consuetudinary analysis of the afterglows of gamma-ray bursts (GRBs) in the conical-ejection fireball scenarios. We argue that, instead, recent observations imply that the long-duration GRBs and their afterglows are produced by highly relativistic jets of cannonballs (CBs) emitted in supernova explosions. The CBs are heated by their collision with the supernova shell. The GRB is the boosted surface radiation the CBs emit as they reach the transparent outskirts of the shell. The exiting CBs further decelerate by sweeping up interstellar matter (ISM). The early X-ray afterglow is dominated by thermal bremsstrahlung from the cooling CBs, the optical afterglow by synchrotron radiation from the ISM electrons swept up by the CBs. We show that this model fits simply and remarkably well all the measured optical afterglows of the 15 GRBs with known redshift, including that of GRB 990123, for which unusually prompt data are available. We demonstrate that GRB 980425 was a normal GRB produced by SN1998bw, with standard X-ray and optical afterglows. We find that the very peculiar afterglow of GRB 970508 can be explained if its CBs encountered a significant jump in density as they moved through the ISM. The afterglows of the nearest 8 of the known-redshift GRBs show various degrees of evidence for an association with a supernova akin to SN1998bw. In all other cases such an association, even if present, would have been undetectable with the best current photometric sensitivities. This gives strong support to the proposition that most, maybe all, of the long-duration GRBs are associated with supernovae. Although our emphasis is on optical afterglows, we also provide an excellent description of X-ray afterglows.

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“…36. The CBs' contribution dominates at very late time and, remarkably, it is in perfect agreement with the HST observation (Fynbo et al 2000) on day 778 after the GRB.…”

Section: Grb 980425 Is Not Exceptionalsupporting

confidence: 87%

On the optical and X-ray afterglows of gamma ray bursts

Dado

Dar

Rújula

2002

A&A

256

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“…In DDD 2001, on the basis of the very meager X-ray data, we argued that the last optically-measured point of the SN1998bw/GRB 980425 pair, at day 778 (Fynbo et al 2000), was due to the CB's AG and not to the supernova. Redoing the analysis with the input of the abundant radio data, we must now revise this conclusion.…”

Section: Sn1998bw: the Accepted Lorementioning

confidence: 96%

“…Observations of the vicinity of the source of GRB 980425 were made with the Hubble Space Telescope (HST) at day 778 ( Fynbo et al 2000), with a tiny astrometric uncertainty of 0. 018, and pointing at ATCA's first reported coordinates.…”

Section: Superluminal Motion In Sn1998bw/grb 980425mentioning

confidence: 99%

On the radio afterglow of gamma ray bursts

Dado

Dar

Rújula

2003

A&A

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Abstract. We use the cannonball (CB) model of gamma ray bursts (GRBs) to predict the spectral and temporal behaviour of their radio afterglows (AGs). A single simple expression describes the AGs at all times and frequencies; its high-frequency limit reproduces the successful CB model predictions for optical and X-ray AGs. We analyze all of the observed radio AGs of GRBs with known redshifts, including those of the exceptionally close-by GRB 980425. We also study in detail the timeevolution of the AGs' spectral index. The agreement between theory and observations is excellent, even though the CB model is extremely frugal in the number of parameters required to explain the radio observations. We propose to use the scintillations in the radio AGs of GRBs to verify and measure the hyperluminal speed of their jetted CBs, whose apparent angular velocity is of the same order of magnitude as that of galactic pulsars, consistently measured directly, or via scintillations.

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“…The association of Gamma-Ray Bursts (GRBs) with collapsing massive stars has been inferred through many observations during the past 7 years, notably through supernova bumps in the afterglow light curves or localisations of the afterglow close to star forming regions (Castro-Tirado & Gorosabel 1999;Bloom et al 1999;Fruchter et al 1999a;Galama et al 1998;Kulkarni et al 1998;Holland & Hjorth 1999;Fynbo et al 2000). Additionally, Bloom et al (2002) argued that GRB progenitors, given their small positional offsets relative to their hosts, are likely massive stars.…”

Section: Introductionmentioning

confidence: 99%

UV star-formation rates of GRB host galaxies

Christensen¹,

Hjorth²,

Gorosabel

2004

A&A

Self Cite

302

357

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Abstract. We study a magnitude-limited sample of 10 gamma-ray burst (GRB) host galaxies with known spectroscopic redshifts (0.43 < z < 2.04). From an analysis of the spectral energy distributions (SEDs), based on published broad-band optical and near-infrared photometry, we derive photometric redshifts, galaxy types, ages of the dominant stellar populations, internal extinctions, and ultraviolet (UV) star-formation rates (SFRs) of the host galaxies. The photometric redshifts are quite accurate despite the heterogeneous nature of the sample: the rms errors are σ(z) = 0.21 and σ(∆z/(1 + z spec )) = 0.16 with no significant systematic offsets. All the host galaxies have SEDs similar to young starburst galaxies with moderate to low extinction. A comparison of specific SFRs with those of high-redshift galaxies in the Hubble Deep Fields shows that GRB hosts are most likely similar to the field galaxies with the largest specific SFRs. On the other hand, GRB hosts are not significantly younger than starburst field galaxies at similar redshifts, but are found to be younger than a sample of all types of field galaxies.

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[ITAL]Hubble Space Telescope[/ITAL] Space Telescope Imaging Spectrograph Imaging of the Host Galaxy of GRB 980425/SN 1998[CLC]bw[/CLC]

Cited by 73 publications

References 27 publications

On the optical and X-ray afterglows of gamma ray bursts

On the optical and X-ray afterglows of gamma ray bursts

On the radio afterglow of gamma ray bursts

UV star-formation rates of GRB host galaxies

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