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GRB 070201

A highly intense short gamma-ray burst (GRB), designated GRB070201, was detected by Konus-Wind, INTEGRAL, Swift, and MESSENGER. The burst occurred at t0 = 15:23:10.78 UT and lasted approximately 0.15 seconds, followed by a weaker pulse lasting around 0.08 seconds. The fluence measured was 1.57 × 10^-5 ergs/cm² (20 keV – 1 MeV), with its position at R.A. 11.089 deg and Dec. 42.308 deg, roughly 1.1 degrees from the center of M31. This GRB shows energy characteristics more akin to soft gamma repeaters than traditional GRBs.

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GRB 070201

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  1. GRB 070201 detected by Konus-Wind, INTEGRAL, Swift, MESSENGER • described as an “extremely intense short hard GRB” (GCN 6088) • t0 = 15:23:10.78 UT • duration ~0.15 seconds, followed by a weaker, softer pulse with duration ~0.08 seconds • fluence = 1.57 x 10-5 ergs/cm2(20 keV – 1 MeV) (GCN 6094) • R.A. = 11.089 deg, Dec = 42.308 deg, error = 0.325 sq. deg center is 1.1 deg from center of M31 (D = 770 kpc) and includes its spiral arms (GCN 6103, 6091) • Eiso ~ 1 x 1045 ergs • more similar to SGR energythan GRB energy FLHO = FLLO = 0.3 Konus-Wind lightcurve Burst F2F Meeting I. Leonor

  2. p = 0.5 (25-ms crosscorrelation) p = 0.9 (100-ms crosscorrelation) Crosscorrelation based triggered search preliminary results(no data quality cuts) Burst F2F Meeting I. Leonor

  3. For circularly polarized, 250-Hz, Q = 8.9 sine-gaussians, taking into account antenna factor, and using V1 calibrations: Assuming M31 location, D = 770 kpc, and merger model: Preliminary limits 25-ms crosscorrelation Burst F2F Meeting I. Leonor

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