1 / 12

GRBs and Supernovae: Updates and Findings from Collaborative Research Meeting

This document provides updates on the search for Gamma-Ray Bursts (GRBs) and Core-collapse Supernovae, including recent discoveries such as GRBs with redshifts and X-ray flares. It outlines progress from 2000 to 2006, with details on the number of GRBs and their characteristics. Additionally, it discusses response to referee comments, changes in the short GRB paper, and information on X-ray flares observed by Swift. Suggestions for future research, including exploring emission from Core Collapse SNe and nearby galaxies are also highlighted.

nanda
Download Presentation

GRBs and Supernovae: Updates and Findings from Collaborative Research Meeting

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Pablo Saz Parkinson (UCSC) Santa Cruz Collaboration Meeting, 20-21 April 2007 Update on the triggered search for GRBs

  2. Outline • Update on GRBs in Milagro field of view • Short GRB paper • Other searches: • Swift X-ray flares • Core-collapse Supernovae

  3. Summary through 2006: • 2000-2001: 25 GRBs, 3 with z, ApJ paper • 2002-2004: 12 GRBs, 2 with z • 2005: 20 GRBs, 7-8 with z • 2006: 25 GRBs, 5-6 with z • Total 2000-2006 (including 24 archival GRBs from IPN/BeppoSAX): 106 GRBs, 17-19 with z, 2-4 with z< 0.5, 4-6 with z<1

  4. New in 2007 • 6 additional GRBs in 2007. Only two more GRBs with redshift (070125 at 1.5 and 070208 at 1.2) • 0.05-5 TeV 99% UL limit 070125: 5.8e-4 erg cm^-2 • 20-10,000 keV fluence = 1.7e-4 erg cm^-2

  5. Short GRB paper: response to referee (1. deadtime) Deadtime: 1700 -> 9% tau = 50 us 1800 -> 12.5% tau = 70 us 1500 -> 5.3% tau = 35 us 1600 -> 6.8% tau = 40 us For non-paralyzable deadtime: tau=(n-m)/nm n=true rate m=observed rate Deadtime with new trigger

  6. Deadtime (cont’d) Deadtime with VME trigger Deadtime with multiplicity trigger

  7. Short GRB paper: Response to Referee (2. Other candidates) • Referee’s comment that predictions of Razzaque model don’t depend on redshift is wrong. • GRB 061210 which referee refers to would have a flux less than an order of magnitude of 050509b

  8. Short GRB paper: other changes • Added paragraph including two references to SGRs and nearby population of short bursts • Highlighted GRB 051103 (from M81?) • Give limits at z=0

  9. Emission from X-ray flares • The First Survey of X-ray Flares from GRBs observed by Swift: Chincarini et al (astro-ph/0702371), Falcone et al (about to be submitted) • All GRBs up to end January 2006 • 110 GRBs, 33 with X-ray flares, total of 77 flares • 10 flares in Milagro FOV

  10. Some examples of flares

  11. Search for emission from Core Collapse SNe • Have a catalog of ~ 150 Type Ibc and 460 Type II in Milagro field of view. • A small percentage of these could be GRBs. We could set a good limit. • SNe are also predicted to produce shocks, emit high energy photons. • “trigger” time is not well defined (within ~ 1 month). Use “untriggered” code?

  12. Conclusions • We have searched 112 GRBs since 2000. • No VHE emission detected yet. • Also searched for emission from Swift flares • Should search for emission from CC SNe and nearby galaxies • Submit GRB paper next week?

More Related