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Title: GROWTH on S190510g: DECam Observation Planning and Follow-up of a Distant Binary Neutron Star Merger Candidate

Abstract

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 May 10 02:59:39.292 UT the GW candidate S190510g was discovered and initially classified as a binary neutron star (BNS) merger with 98% probability. The GW event was localized within an area of 3462 deg 2, later refined to 1166 deg 2 (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 4 m Blanco Telescope at Cerro Tololo Inter-American Observatory 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 hrmore » of the merger time, we observed 65% of the total enclosed probability of the final skymap with an observing efficiency of 94%. Here, we identified and publicly announced 13 candidate counterparts. S190510g was reclassified 1.7 days after the merger, after our observations were completed, with a "BNS merger" probability reduced from 98% to 42% in favor of a "terrestrial classification.« less

Authors:
ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]; ORCiD logo [4]; ORCiD logo [5]; ORCiD logo [6]; ORCiD logo [5]; ORCiD logo [7]; ORCiD logo [1]; ORCiD logo [4];  [1]; ORCiD logo [8]; ORCiD logo [1]; ORCiD logo [9]; ORCiD logo [1];  [1]; ORCiD logo [3] more »; ORCiD logo [10]; ORCiD logo [11]; ORCiD logo [1];  [12];  [1]; ORCiD logo [12] « less
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. NASA Goddard Space Flight Center (GSFC), Greenbelt, MD (United States); Univ. of Maryland, College Park, MD (United States)
  3. Univ. of Maryland, College Park, MD (United States)
  4. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
  5. Stockholm Univ., Stockholm (Sweden)
  6. Swinburne Univ. of Technology, Hawthorn, VIC (Australia); ARC Centre of Excellence for Gravitational Wave Discovery (OzGrav) (Australia)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  8. Columbia Univ., New York, NY (United States)
  9. Swinburne Univ. of Technology, Hawthorn, VIC (Australia); Australian Research Council Centre of Excellence for Gravitational Wave Discovery(OzGrav), Hawthorn, VIC (Australia)
  10. Univ. of Washington, Seattle, WA (United States)
  11. National Tsing Hua Univ., Hsinchu (Taiwan)
  12. Univ. of California, Berkeley, CA (United States)
Publication Date:
Research Org.:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1564064
Grant/Contract Number:  
AC02-05CH11231
Resource Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 881; Journal Issue: 1; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; binaries: general; gravitational waves; methods: observational; stars: neutron; supernovae: general

Citation Formats

Andreoni, Igor, Goldstein, Daniel A., Anand, Shreya, Coughlin, Michael W., Singer, Leo P., Ahumada, Tomás, Medford, Michael, Kool, Erik C., Webb, Sara, Bulla, Mattia, Bloom, Joshua S., Kasliwal, Mansi M., Nugent, Peter E., Bagdasaryan, Ashot, Barnes, Jennifer, Cook, David O., Cooke, Jeff, Duev, Dmitry A., Fremling, U. Christoffer, Gatkine, Pradip, Golkhou, V. Zach, Kong, Albert K. H., Mahabal, Ashish, Martínez-Palomera, Jorge, Tao, Duo, and Zhang, Keming. GROWTH on S190510g: DECam Observation Planning and Follow-up of a Distant Binary Neutron Star Merger Candidate. United States: N. p., 2019. Web. doi:10.3847/2041-8213/ab3399.
Andreoni, Igor, Goldstein, Daniel A., Anand, Shreya, Coughlin, Michael W., Singer, Leo P., Ahumada, Tomás, Medford, Michael, Kool, Erik C., Webb, Sara, Bulla, Mattia, Bloom, Joshua S., Kasliwal, Mansi M., Nugent, Peter E., Bagdasaryan, Ashot, Barnes, Jennifer, Cook, David O., Cooke, Jeff, Duev, Dmitry A., Fremling, U. Christoffer, Gatkine, Pradip, Golkhou, V. Zach, Kong, Albert K. H., Mahabal, Ashish, Martínez-Palomera, Jorge, Tao, Duo, & Zhang, Keming. GROWTH on S190510g: DECam Observation Planning and Follow-up of a Distant Binary Neutron Star Merger Candidate. United States. doi:10.3847/2041-8213/ab3399.
Andreoni, Igor, Goldstein, Daniel A., Anand, Shreya, Coughlin, Michael W., Singer, Leo P., Ahumada, Tomás, Medford, Michael, Kool, Erik C., Webb, Sara, Bulla, Mattia, Bloom, Joshua S., Kasliwal, Mansi M., Nugent, Peter E., Bagdasaryan, Ashot, Barnes, Jennifer, Cook, David O., Cooke, Jeff, Duev, Dmitry A., Fremling, U. Christoffer, Gatkine, Pradip, Golkhou, V. Zach, Kong, Albert K. H., Mahabal, Ashish, Martínez-Palomera, Jorge, Tao, Duo, and Zhang, Keming. Fri . "GROWTH on S190510g: DECam Observation Planning and Follow-up of a Distant Binary Neutron Star Merger Candidate". United States. doi:10.3847/2041-8213/ab3399.
@article{osti_1564064,
title = {GROWTH on S190510g: DECam Observation Planning and Follow-up of a Distant Binary Neutron Star Merger Candidate},
author = {Andreoni, Igor and Goldstein, Daniel A. and Anand, Shreya and Coughlin, Michael W. and Singer, Leo P. and Ahumada, Tomás and Medford, Michael and Kool, Erik C. and Webb, Sara and Bulla, Mattia and Bloom, Joshua S. and Kasliwal, Mansi M. and Nugent, Peter E. and Bagdasaryan, Ashot and Barnes, Jennifer and Cook, David O. and Cooke, Jeff and Duev, Dmitry A. and Fremling, U. Christoffer and Gatkine, Pradip and Golkhou, V. Zach and Kong, Albert K. H. and Mahabal, Ashish and Martínez-Palomera, Jorge and Tao, Duo and Zhang, Keming},
abstractNote = {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 May 10 02:59:39.292 UT the GW candidate S190510g was discovered and initially classified as a binary neutron star (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 4 m Blanco Telescope at Cerro Tololo Inter-American Observatory 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 hr of the merger time, we observed 65% of the total enclosed probability of the final skymap with an observing efficiency of 94%. Here, we identified and publicly announced 13 candidate counterparts. S190510g was reclassified 1.7 days after the merger, after our observations were completed, with a "BNS merger" probability reduced from 98% to 42% in favor of a "terrestrial classification.},
doi = {10.3847/2041-8213/ab3399},
journal = {The Astrophysical Journal. Letters},
number = 1,
volume = 881,
place = {United States},
year = {2019},
month = {8}
}

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