[Paper Review] Interplanetary network localizations of Konus short gamma-ray bursts

V. Pal'Shin, K. Hurley+10 more|arXiv (Cornell University)|Jan 1, 2013

Gamma-ray bursts and supernovaePhysics and Astronomy64 references32 citations

TL;DR

This paper presents the most comprehensive interplanetary network (IPN) localization data for 271 short gamma-ray bursts detected by the Konus-Wind instrument between 1994 and 2010, using triangulation from up to eleven spacecraft. It achieves sub-degree error regions, with 92% of bursts localized via IPN triangulation, enabling precise follow-up for gravitational wave, high-energy photon, and magnetar flare searches.

ABSTRACT

Between the launch of the Global Geospace Science Wind spacecraft in 1994 November and the end of 2010, the Konus-Wind experiment detected 296 short-duration gamma-ray bursts (including 23 bursts which can be classified as short bursts with extended emission). During this period, the Interplanetary Network (IPN) consisted of up to 11 spacecraft, and using triangulation, the localizations of 271 bursts were obtained. We present the most comprehensive IPN localization data on these events. The short burst detection rate, ∼18 yr-1, exceeds that of many individual experiments. © 2013. The American Astronomical Society. All rights reserved.

Motivation & Objective

• To provide the most complete and accurate localization of short gamma-ray bursts detected by Konus-Wind using the Interplanetary Network (IPN).
• To improve the precision of burst localization by combining data from multiple spacecraft, including both near-Earth and distant missions.
• To enable multi-messenger astronomy by delivering high-accuracy error regions for follow-up observations of gravitational waves, high-energy photons, and giant soft gamma-ray repeater (SGR) flares.
• To calibrate imaging instruments by deriving triangulation annuli for 17 precisely localized bursts.
• To assess the reliability of short burst classifications by analyzing localization consistency with known sources like SGRs and nearby galaxies.

Proposed method

• Used time-of-arrival triangulation across the IPN, combining Konus-Wind with up to eleven other spacecraft including Ulysses, NEAR, Mars Odyssey, MESSENGER, INTEGRAL, Swift, Fermi, and others.
• Applied arrival-time analysis to derive error regions (annuli, boxes, segments) based on time delays between spacecraft detections.
• Calculated error region areas, maximum dimensions, and sky positions (J2000 coordinates) for each burst, with corner coordinates and center positions provided.
• Classified error regions by type: 'B' (box), 'LB' (long box), 'S' (segment), or 'A' (annulus), with curvature considered for large regions.
• Used data from 517 triangulation annuli, including 150 from distant spacecraft, to refine localization accuracy.
• Validated results against known sources (e.g., SGR 1900+14, M74, Andromeda) and cross-referenced with prior literature and follow-up observations.

Experimental results

Research questions

• RQ1 What is the localization accuracy of short gamma-ray bursts detected by Konus-Wind using the IPN triangulation method?
• RQ2 How do error regions from near-Earth spacecraft compare to those from distant spacecraft in terms of area and precision?
• RQ3 Can the IPN localization data help identify associations with known sources such as giant SGR flares or nearby galaxies?
• RQ4 What fraction of Konus-Wind short bursts can be localized with high precision using only near-Earth spacecraft data?
• RQ5 How do the derived error regions support follow-up searches for gravitational waves, high-energy photons, and SGR flares?

Key findings

• 271 out of 296 Konus-Wind short bursts (92%) were localized via IPN triangulation, with 254 bursts having derived error regions.
• IPN error region areas ranged from 2.40×10⁻⁴ sq. deg (0.86 arcmin²) for distant-satellite-only detections to 4420 sq. deg for near-Earth-only detections.
• The mean area for distant-satellite detections was 3.49 sq. deg (geometric mean 0.141 sq. deg), while for near-Earth-only detections it was 242 sq. deg (geometric mean 46.2 sq. deg).
• For many bursts, Konus-Wind and near-Earth spacecraft triangulation produced annuli with half-widths comparable to or better than those from distant spacecraft, yielding error boxes of several hundred arcmin².
• The IPN localization of GRB 051103 is consistent with a giant SGR flare in the M81 group, and GRB 070201 is likely associated with the Andromeda galaxy.
• GRB 990405's association with SGR 1900+14 is doubtful due to its extreme hardness, exceeding even the hardest known SGR bursts.