astronomy

Giant GRB Ring

Giant GRB Ring is a astronomy topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Giant GRB Ring rather than just read about it. In short: The Giant GRB Ring is a ring of 9 gamma-ray bursts (GRBs) that may be associated with one of the largest known cosmic structures. It was discovered in July 2015 by a team of Hungarian and American astronomers led by L.G.

Key takeaways

Giant GRB Ring belongs to astronomy; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Giant GRB Ring to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Giant GRB Ring from memory before moving on to harder problems.

Reference excerpt

The Giant GRB Ring is a ring of 9 gamma-ray bursts (GRBs) that may be associated with one of the largest known cosmic structures. It was discovered in July 2015 by a team of Hungarian and American astronomers led by L.G. Balazs while analyzing data from different gamma-ray and X-ray telescopes, in particular the Swift Spacecraft. The ring of GRBs lies at a distance of about 2.8 gigaparsecs (9.1 billion light years) from Earth at the redshift between 0.78 and 0.86 and measures about 1.72 gigaparsecs (5.6 billion light years) in diameter, making it one of the largest structures known. Typically, the distribution of GRBs in the universe appears in the sets of less than the 2σ distribution, or with fewer than two GRBs in the average data of the point-radius system. Thus, such a concentration as this appears extremely unlikely, given accepted theoretical models. Proposals include the existence of a giant supergalactic structure. This would be an extremely huge structure of the universe, with a mean size of about 5.6 billion light years. Such a supercluster can explain the significant distribution of GRBs because of its tie to star formation. If such a structure did exist, it would be one of the largest structures of the observable universe and would exceed the 1.2 billion light year size threshold of the currently accepted model of cosmology, potentially challenging the cosmological principle.

Discovery In early July 2015, after the discovery of the Hercules–Corona Borealis Great Wall, I. Horvath, J. Hakkila and Z. Bagoly, among others, conducted a further detailed analysis of the spatial distribution of GRBs within the distant universe. Provided by more than 15 years of data from the Swift Gamma-Ray Burst Mission, amongst other ground-based telescopes, they assessed the data to see if any more structures can be seen using the method of GRB correlation. They noticed a significant clustering of GRBs within z = 0.78–0.86, with nine GRBs concentrated in that region of 43 by 30 degrees of the sky. With further tests and analyses of the clustering, they found out that the sample had a higher concentration than the expected normal level, indication of a massive galactic structure within the vicinity.

Characteristics The authors list the following characteristics for the 9 GRBs in the ring (l and b are standard Sun-referenced galactic coordinates).

It is approximately 9.1 billion light years from Earth and about 5.6 billion light years across.

Further reading Balázs, L. G.; Rejtő, L.; Tusnády, G. (21 January 2018). "Some statistical remarks on the giant GRB ring". Monthly Notices of the Royal Astronomical Society. 473 (3): 3169–3179. arXiv:1710.01621. Bibcode:2018MNRAS.473.3169B. doi:10.1093/mnras/stx2550. Pinter, S. (10 September 2018). "Multi-messenger studies of γ-ray bursts and their cosmic environment". Astronomische Nachrichten. 339 (5): 336–340. Bibcode:2018AN....339..336P. doi:10.1002/asna.201813501.

References

Worked examples

Example 1 — a first encounter with Giant GRB Ring

Start with the simplest possible case. Write down what Giant GRB Ring claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In astronomy, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Giant GRB Ring before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Giant GRB Ring ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Giant GRB Ring

In research: Giant GRB Ring appears in astronomy research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Giant GRB Ring in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Giant GRB Ring is common in secondary-school and first-year university syllabi. It links to neighbouring topics Galaxy superclusters, Gamma-ray bursts, Large-scale structure of the cosmos, so understanding it makes those chapters shorter.
In everyday life: Look for Giant GRB Ring outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Giant GRB Ring in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Giant GRB Ring means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Giant GRB Ring out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Giant GRB Ring in simple terms?

Why does Giant GRB Ring matter?

Because it connects several astronomy ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Giant GRB Ring?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Giant GRB Ring.