GROWTH on S190510g: DECam Observation Planning and Follow-Up of a Distant Binary Neutron Star Merger Candidate
| Autor: | Jennifer Barnes, Jorge Martínez-Palomera, Leo Singer, David O. Cook, Dmitry A. Duev, Daniel A. Goldstein, Tomas Ahumada, Michael W. Coughlin, Ashish Mahabal, Ashot Bagdasaryan, Erik C. Kool, Jeff Cooke, Peter Nugent, Mansi M. Kasliwal, Albert K. H. Kong, Pradip Gatkine, Mattia Bulla, Joshua S. Bloom, V. Zach Golkhou, U. Christoffer Fremling, Igor Andreoni, Keming Zhang, Sara Webb, Shreya Anand, Michael Medford, Duo Tao |
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| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
astro-ph.SR
010504 meteorology & atmospheric sciences observational [methods] Binary number FOS: Physical sciences Astronomy & Astrophysics 01 natural sciences law.invention Telescope general [binaries] neutron [stars] Observatory law 0103 physical sciences 010303 astronomy & astrophysics Instrumentation and Methods for Astrophysics (astro-ph.IM) Solar and Stellar Astrophysics (astro-ph.SR) 0105 earth and related environmental sciences Physics astro-ph.HE High Energy Astrophysical Phenomena (astro-ph.HE) Gravitational wave Astronomy Astronomy and Astrophysics Scheduling system Methods observational LIGO Neutron star gravitational waves Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Astrophysics - High Energy Astrophysical Phenomena Astrophysics - Instrumentation and Methods for Astrophysics general [supernovae] Astronomical and Space Sciences astro-ph.IM |
| Zdroj: | Astrophysical Journal Letters, vol 881, iss 1 The Astrophysical Journal Letters, vol 881, iss 1 |
| Popis: | The first two months of the third Advanced LIGO and Virgo observing run (2019 April-May) showed that distant gravitational wave (GW) events can now be readily detected. Three candidate mergers containing neutron stars (NS) were reported in a span of 15 days, all likely located more than 100 Mpc away. However, distant events such as the three new NS mergers are likely to be coarsely localized, which highlights the importance of facilities and scheduling systems that enable deep observations over hundreds to thousands of square degrees to detect the electromagnetic counterparts. On 2019-05-10 02:59:39.292 UT the GW candidate S190510g was discovered and initially classified as a BNS merger with 98% probability. The GW event was localized within an area of 3462 deg2, later refined to 1166 deg2 (90%) at a distance of 227 +- 92 Mpc. We triggered Target of Opportunity observations with the Dark Energy Camera (DECam), a wide-field optical imager mounted at the prime focus of the 4m Blanco Telescope at CTIO in Chile. This Letter describes our DECam observations and our real-time analysis results, focusing in particular on the design and implementation of the observing strategy. Within 24 hours of the merger time, we observed 65% of the total enclosed probability of the final skymap with an observing efficiency of 94%. We identified and publicly announced 13 candidate counterparts. S190510g was re-classified 1.7 days after the merger, after our observations were completed, with a "binary neutron star merger" probability reduced from 98% to 42% in favor of a "terrestrial" classification. 4 figures, 3 tables, accepted for publication in ApJL |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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