Update on the triggered search for GRBs

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Presentation transcript:

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

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

Summary through 2006: 2000-2001: 25 GRBs, 3 with z, ApJ paper 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

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

Short GRB paper: response to referee (1. 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

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

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

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

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

Some examples of flares

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?

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?