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Search for VHE emission from satellite-triggered GRBs with Milagro (update)

Pablo Saz Parkinson University of California, Santa Cruz LANL Collaboration Meeting, 10 May 2006. Search for VHE emission from satellite-triggered GRBs with Milagro (update). How many GRBs so far:. 2000-2001: 25, 3 with z, ApJ paper 2002-2004: 12, 2 with z 2005: 20, 7-8 with z

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Search for VHE emission from satellite-triggered GRBs with Milagro (update)

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  1. Pablo Saz Parkinson University of California, Santa Cruz LANL Collaboration Meeting, 10 May 2006 Search for VHE emission from satellite-triggered GRBswith Milagro (update)

  2. How many GRBs so far: • 2000-2001: 25, 3 with z, ApJ paper • 2002-2004: 12, 2 with z • 2005: 20, 7-8 with z • 2006 (through 060507): 15, 2 with z • Total 2000-2006: 72 GRBs, 14-15 with z, 2-3 with z< 0.5, 4-5 with z<1

  3. Distribution of zenith angles

  4. Still no low z, low zenith, bright burst: • Lowest zenith angles: 021104, 051109 (z=2.346),060427, and 050509b • Lowest redshift: 040924 (z=0.859, zenith=43.3),051221 (z=0.55,zenith=42),060218 (z=0.03,zenith>44), 050509b (z=0.226?) • 050509b was one of the dimmest bursts.

  5. A few interesting candidates • GRB 060218 -> Closest GRB so far, z=0.03 • Bad zenith angle: > 43 degrees • Very long: ~ 2000s • 10 s “hard” spike • 6.8x10-6 erg cm-2 15-200 keV

  6. GRB 060427b (GCN Circular 5061) • 0.2 s IPN Burst. Good zenith angle (16 degrees) • (4.95x10-6 erg cm-2 20-10000 keV), • No redshift • E2dN/dE @ 2 TeV < 4.8 x 10-8 erg cm-2 (No EBL absorption assumed) • E2dN/dE @ 150 GeV < 5.1 x 10-6 erg cm-2 (Primack et al. EBL model at z=0.5)

  7. Short/Hard Bursts in Milagro FOV • 040924 : 0.6s, 43o, z=0.859, 2.6x10-6 erg cm-2 • 051221: 0.2s, 42o, z=0.55, 2.4x10-6 erg cm-2 • 050509b: 0.128s, 10o, z=0.226?, 2.3x10-8 erg cm-2 • 060313: 0.8s, 47o,z=?, 1.4x10-5 erg cm-2 • 060427b: 0.2s, 16o, z=?,4.95x10-6 erg cm-2 • ApJL on SHBs?

  8. SGR 1900+14 Outburst • Starting 3/25/06 through 3/29/06 • XMM and INTEGRAL TOO observations 4/1 • 4 mini bursts (0.016 and 0.032s) in Milagro FOV

  9. Conclusions • 72 GRBs searched since 2000. • No VHE emission detected yet. • Could write paper on SHBs (5, 3 with known z)

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