Questions tagged [gamma-ray-bursts]

Gamma ray bursts are flashes of gamma rays, produced by extremely powerful explosions in distant galaxies. They are among the most powerful events in the universe

Filter by
Sorted by
Tagged with
21 votes
1 answer
4k views

Why are there no gamma-ray bursts detected in our galaxy?

I found from Wikipedia and other sites that there are no GRBs detected in the Milky Way. Can someone give a feasible reason for that? Why are there no GRBs detected in the Milky Way galaxy?
17 votes
1 answer
646 views

"Who saw" the binary neutron star merger first? What was the sequence of events? (GRB/GW170817)

I'm trying to read Multi-messenger Observations of a Binary Neutron Star Merger the "cast of thousands" OPEN Access ApJ letter 848:L12 (59pp), 2017 October 20 https://doi.org/10.3847/2041-8213/aa91c9 ...
  • 30.4k
13 votes
2 answers
1k views

If GRB 080319B happened next to nearest star: Proxima Centauri, what effect would that have had on us?

From a Reddit post GRB 080319B was a gamma-ray burst (GRB) detected by the Swift satellite at 06:12 UTC on March 19, 2008. The burst set a new record for the farthest object that was observable with ...
  • 427
11 votes
2 answers
372 views

Are Gamma Ray Bursts of galactic or extragalactic origin?

I read about the 1995 Lamb-Paczynski debate on whether GRBs are galactic or extragalactic in origin. With our current experimental evidence, have we found whether GRBs are galactic or extragalactic?
  • 213
11 votes
1 answer
220 views

Do mixed type remnant collisions produce anything interesting?

The recent detection of a binary neutron star inspiraling and colliding raises an interesting question in my mind. Type Ia supernovae are believed to be caused by white dwarf/regular star pairs and/or ...
  • 2,866
9 votes
1 answer
489 views

Why can there be several seconds of lag between a binary neutron star merger and the emission of gamma rays from the same area?

Answers to: Gravitational waves and gamma ray burst: how were the error bars determined for this speed of gravity calculation? Was $H_0$ used? go into substantial detail explaining this determination. ...
  • 30.4k
9 votes
1 answer
317 views

How does the Gamma Ray Burst that occurred when 2 black holes merged compare to other GRB's?

A Gamma Ray Burst was detected 0.4 seconds after the gravitational wave event, GW150914, caused by a black hole merger, and it was in the same part of the sky. It is uncertain whether that Gamma Ray ...
  • 762
8 votes
1 answer
1k views

How likely and severe is the threat of a gamma ray burst to earth?

In the National Geographic article: http://news.nationalgeographic.com/news/2009/04/090403-gamma-ray-extinction_2.html it is suggested that a gamma ray burst likely caused a mass extinction in earth's ...
  • 3,999
8 votes
1 answer
628 views

Is there any possible connection between Gamma Ray Burst and Fast Radio Bursts?

The physical nature of Fast Radio Bursts (FRBs), a new type of cosmological transients discovered recently, is not known. It has been suggested that FRBs can be produced when a spinning supra-massive ...
7 votes
1 answer
69 views

What does it mean for something to be optically thick to pair production?

I have seen several references in the high energy astrophysics literature (including the example below) which make reference to an astronomical source being "thick to pair production". What ...
7 votes
2 answers
146 views

What happens to the energy from a GRB?

A gamma ray burst produces somewhere around 1044 J of energy, according to Wikipedia. Only a small portion of that energy will be absorbed by other objects. The rest of that energy will go on to ...
  • 1,177
7 votes
1 answer
164 views

Energy Source for Gamma Rays from Merging Neutron Stars

When the two neutron stars merged in the latest event, large amounts of gamma rays were emitted. Given that their deorbitting is a result of gravitational wave production, where does the energy for ...
6 votes
2 answers
3k views

Quasars and Gamma Ray Bursts

Has there been any study to suggest that either quasars of gamma ray bursts are more detectable from further distances in the universe? I've read that quasars are the most powerful energy in the ...
6 votes
1 answer
364 views

What do the acronyms in "AT 2017 gfo" mean?

About 11 hours after the detection of GW170817 by Ligo/Virgo and the quickly succeeding detected GRB170817, a transient afterglow in the optical-nIR frequency appeared which showed many signs of r-...
5 votes
1 answer
2k views

What is the shape and size of a gamma ray burst?

As I understand it, a gamma ray burst is created when a massive star collapses into a black hole. The poles of the black hole eject a massive burst of energy which we know as gamma ray bursts. So my ...
  • 1,962
5 votes
1 answer
172 views

Gamma ray detection for SETI. How far away could we detect an alien nuclear powered rocket?

I suspect our best bet for finding advanced civilisations is to look for gamma rays characteristic of nuclear/antimatter propulsion. If an alien civilisation was using something similar to the Orion ...
  • 3,968
5 votes
1 answer
340 views

Could a pair of binary black holes form within a star?

After the discovery of gravitational waves by LIGO last week the team behind the Fermi gamma-ray telescope released a paper that showed a soft gamma ray burst was detected only 0.4s after the ...
  • 1,471
4 votes
1 answer
139 views

If getting shined on by a gamma ray is an extinction level event how do we detect them?

Cosmic gamma ray bursts are seriously powerful and do a lot of damage. So how did we measure gamma ray frequencies without getting fried? I have two possible explanations: We never detected them ...
  • 253
4 votes
0 answers
282 views

Generate probability skymap

I am trying to generate skymaps for a set of Fermi GBM triggers, containing the probability that a trigger originated in a given part of the sky. For each trigger, I have access to the RA, dec, error ...
  • 41
3 votes
2 answers
42 views

Why the lows of the GRB 2014-04-27 in Andromeda?

The Swift gamma ray burst space telescope has measured a GRB according to the link below. But why the oscillations in the measured gamma rate? Why wasn't just an increase detected, but also as big ...
  • 10.9k
3 votes
1 answer
173 views

Should we expect clues from a gamma ray burst causing massive extinctions on Earth?

I remember reading an article on the subject highlighting the periodicity of this event throughout history supposing it could be caused by the rotation of the sun around the galaxy. My question is: ...
's user avatar
3 votes
2 answers
252 views

Is there a way to know how the magnetic field was at the very beginning of our universe?

I recently read that Gamma-ray bursts are catastrophic events, related to the explosion of massive stars 50 times the size of our sun. If you ranked all the explosions in the universe based on ...
  • 1,402
2 votes
3 answers
394 views

Should we fear Wolf-Rayet WR-104?

I've read on Quora about Wolf-Rayet binary star WR-104, which is thought to be a precursor to a supernova explosion with two accompannying gamma ray bursts. It looks as if the rays will travel in our ...
2 votes
1 answer
332 views

Why is the number of Long Gamma Ray Burst (LGRB) event occurrences greater than the number of Short Gamma Ray Burst (SGRB) event occurrences?

I collected from NASA this histogram plotting the number of GRBs vs the duration of GRBs. Now my question is, why is the number of Long Gamma Ray Bursts (LGRBs) events occurrences greater than the ...
2 votes
1 answer
40 views

What is the difference between $E_\gamma$ and $E_{\gamma,iso}$ in gamma ray bursts?

In the literature on gamma ray bursts I see several references to $E_\gamma$ and $E_{\gamma,iso}$ for example as in Piran (2005) $E_{k,iso,52}$ is “isotropic equivalent” kinetic energy, discussed ...
  • 41
2 votes
2 answers
138 views

What does the word "compact" mean in astronomy/astrophysics?

I have seen countless times the adjective "compact" in astronomy, e.g. compact stars, compact binaries, etc. I would like to know, what exactly is this supposed to mean? From this source, I am led to ...
2 votes
1 answer
72 views

Extent of knowledge of potential future gamma ray bursts

What do we know about the locations and directions of potential Gamma ray bursts that may intersect with Earth in the future, or are we mostly blind to when such an event directed our way may occur &...
2 votes
1 answer
133 views

How do we know an event is a gamma-ray burst?

How do we know an event is a gamma-ray burst (grb)? There are two kinds of grbs, long burst and shot burst, which are caused by supernova explosions explosion and the merger of two neutron stars, ...
  • 2,955
2 votes
0 answers
117 views

Could FRB be the result of matter-antimatter annihilation?

I was listening to a scientific podcast about CPT-symmetry and mirror-universes, and when speaking about matter-antimatter annihilation, they stated that several emissions would occur at this time, ...
1 vote
1 answer
93 views

Where can I look up assigned origins of gamma ray bursts events? (GRBs)

Gamma ray burst GRB170817A is believed to have originated from the merger of Neutron Star(NS)-Neutron Star(NS). From this article on the associated gravitational wave detection GW170817: The ...
1 vote
0 answers
24 views

Frequency vs Flux data for Gamma Ray Bursts (GRB190114C)

I am working on a research project to prove Synchrotron-Self-Compton radiation through the case study of GRB190114C and am not able to find data for the frequency spectrum even though all telescoped ...
-7 votes
1 answer
454 views

What are the Gamma rays and Cosmic rays effects on humans and equipments? [closed]

First of all not to consider me a conspiracy theorist, but isn't landing on the moon a questionable issue? I am really not an expert in astronomy but let's assume that a moon landing has happened. 1- ...