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Update on the triggered search for GRBs

Pablo Saz Parkinson (UCSC) Santa Cruz Collaboration Meeting, 20-21 April 2007. Update on the triggered search for GRBs. Outline. Update on GRBs in Milagro field of view Short GRB paper Other searches: Swift X-ray flares Core-collapse Supernovae. Summary through 2006:.

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Update on the triggered search for GRBs

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  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?

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