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Grossan grbtelescope+bsti

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Information about Grossan grbtelescope+bsti

Published on August 17, 2017

Author: BaurzhanAlzhanov

Source: slideshare.net

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1. Understanding Prompt Emission from Gamma-Ray Bursts: Fast, Early, and Multi-Colored Bruce Grossan Energetic Cosmos Laboratory, Nazarbayev University & UC Berkeley ECL Collaborators: George Smoot, Eric Linder, Magzhan Kistubaev

2. I. What is a GRB? • GRB stands for “gamma ray burst” • This talk is almost exclusively LONG type GRBs 2

3. Long Gamma-Ray Bursts(GRBs) • 15-200 keV Swift BAT light curves (LCs) • Heterogeneous in every way • LCs by Kas McLean 3

4. Long GRB • Most Common GRB • Associated with Star- forming regions, SNe • Typical z ~ 2 • LGRBs > 2 s, softer spectrum than others 4

5. More GRB Basics • Most energetic events in the universe ‣ Distant: z = 8.2 (090423); zphoto= 9.4 (090429b) • Can be seen to z~12 with large detectors • Gamma-Ray Bursts (GRB) last msec – hr. • Measured up to GeV • Long Type GRB sometimes massive star collapse SNe ‣ GRB 980425 ==> SN1998BW 5

6. Gamma-Ray Bursts: Cosmic Mystery • We have models of: Explosion, Jets, Gravitational wave emission... But the emission mechanism remains unknown! 6 Z=12 GRB limit Farther than first stars • The Universe’s most energetic explosions • Bright: can be seen beyond even first stars

7. ~0-102 s ≳102 s Prompt Afterglow GRB Cartoon Picture Mészáros: https://ned.ipac.caltech.edu/level5/Sept13/Meszaros/Meszaros2.html • GRB are so bright and variable because of relativistic be

8. LogOpticalFlux-> Log Time -> Most GRB Have Optical Afterglows Prompt X/

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