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J/ApJ/848/L33        Opt. follow-up of GW events with LCO        (Arcavi+, 2017)

Optical follow-up of gravitational-wave events with Las Cumbres Observatory. Arcavi I., McCully C., Hosseinzadeh G., Howell D.A., Vasylyev S., Poznanski D., Zaltzman M., Maoz D., Singer L., Valenti S., Kasen D., Barnes J., Piran T., Fong W.-F. <Astrophys. J., 848, L33-33 (2017)> =2017ApJ...848L..33A (SIMBAD/NED BibCode)
ADC_Keywords: Galaxies, optical ; Gravitational wave ; Magnitudes Keywords: galaxies: statistics; gravitational waves; methods: observational Abstract: We present an implementation of the Gehrels+ (2016ApJ...820..136G) galaxy-targeted strategy for gravitational-wave (GW) follow-up using the Las Cumbres Observatory global network of telescopes. We use the Galaxy List for the Advanced Detector Era (GLADE) galaxy catalog, which we show is complete (with respect to a Schechter function) out to ∼300Mpc for galaxies brighter than the median Schechter function galaxy luminosity. We use a prioritization algorithm to select the galaxies with the highest chance of containing the counterpart given their luminosity, their position, and their distance relative to a GW localization, and in which we are most likely to detect a counterpart given its expected brightness compared to the limiting magnitude of our telescopes. This algorithm can be easily adapted to any expected transient parameters and telescopes. We implemented this strategy during the second Advanced Detector Observing Run (O2) and followed the black hole merger GW170814 and the neutron star merger GW170817. For the latter, we identified an optical kilonova/macronova counterpart thanks to our algorithm selecting the correct host galaxy fifth in its ranked list among the 182 galaxies we identified in the Laser Interferometer Gravitational-wave Observatory (LIGO)/Virgo localization. Description: Las Cumbres Observatory (LCO) consists of 20 optical telescopes (two 2m, nine 1m and nine 0.4m in diameter) at six sites around the world (Table 1), operated robotically using dynamical scheduling software. Each telescope class uses a different type of imager with a different field of view (FOV) and pixel scale. All imagers are equipped with standard Sloan Digital Sky Survey (SDSS) and Johnson filters, as well as a broad w filter covering the gri bands. The 2m telescopes are also equipped with low-resolution (R∼400) Floyds spectrographs. Objects: --------------------------------------------------------------- RA (ICRS) DE Designation(s) --------------------------------------------------------------- 03 11.0 -44 57 G297595 = GrW 170814 12 47.0 -39 48 GRB170817A = GRB 170817A 13 09 48.09 -23 22 53.3 G298048 = GrW 170817 --------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table3.dat 84 49 LCO follow-up observations of the initial LIGO/Virgo localization for Trigger G297595 in descending order of galaxy priority table4.dat 84 14 LCO follow-up observations of the updated LIGO/Virgo localization for Trigger G297595 in descending order of galaxy priority table5.dat 84 30 LCO follow-up observations of the Fermi GBM Trigger of GRB170817A in descending order of galaxy priority table6.dat 84 96 LCO follow-up observations of LIGO/Virgo localization for GW170817 in descending order of galaxy priority
See also: VII/275 : GLADE catalog (Dalya+, 2016) VII/267 : Gravitational Wave Galaxy Catalogue (White+ 2011) VII/233 : The 2MASS Extended sources (IPAC/UMass, 2003-2006) VII/237 : HYPERLEDA. I. Catalog of galaxies (Paturel+, 2003) J/ApJ/848/L16 : Counterpart of GW170817. I. DECam obs. (Soares-Santos+, 2017) J/ApJ/848/L29 : Opt. follow-up of GW170817 counterpart (Diaz+, 2017) J/ApJ/851/L21 : UV-NIR obs. compilation of GW170817 counterpart (Villar+, 2017) Byte-by-byte Description of file: table[3456].dat
Bytes Format Units Label Explanations
1- 7 I7 --- GLADE [7/1850989] GLADE identification number (1) 9- 18 F10.6 deg RAdeg Right ascension (J2000) 20- 29 F10.6 deg DEdeg [-49.5/-11.6] Declination (J2000) 31- 33 I3 Mpc Dist [9/494] Distance 35- 39 F5.2 mag Bmag [8.5/17.3] B-band apparent magnitude 41- 46 F6.3 --- LB/LB* [0.01/10.3] Schechter luminosity function comparison (2) 48- 58 A11 "Y/M/D" obs.date UT date of the observation (1) 60- 67 A8 "h:m:s" obs.time Time of the observation (1) 69- 76 A8 --- Tel Telescope (1)(3) 78 A1 --- Filt [girw] Filter (1) 80- 84 F5.2 --- Lim [17.4/23.3]?=0 Limiting magnitude (3σ) (1)
Note (1): Provided as is from the GLADE catalog (see VII/275). A limiting magnitude was not calculated for fields with very few APASS stars visible. All exposures were 300s long. Note (2): Following G16 (Gehrels+ 2016ApJ...820..136G), we analyze the completeness of the GLADE catalog relative to the Schechter luminosity function (Schechter 1976ApJ...203..297S), which provides a form for the number density of galaxies ρgal(x)dx=φ*xαe-xdx, where x=L/L* with L the luminosity of the galaxy and L* a parameter of the function. Since the GLADE catalog contains B-band data, we use x=LB/LB*. In order to compare the GLADE catalog with those presented in G16, we adopt the same parameters as they did, namely: φ*=1.6x10-2h3Mpc-3 (with h=0.7), α=-1.07, and an LB* corresponding to MB*=-20.47. See section 3.1 for further explanations. Note (3): Las Cumbres Observatory (LCO) optical telescope as follows: COJ 0.4m = Siding Spring observatory, Australia (x2) COJ 1m = Siding Spring observatory, Australia (x2) CPT 1m = SAAO observatory, South Africa (x3) LSC 1m = CTIO observatory, Chile (x3) COJ 2m = Siding Spring observatory, Australia (x1) OGG 2m = Haleakala observatory, Hawaii, USA (x1) See table 1 for the complete Las Cumbres Observatory Global Network of Robotic Telescopes list.
History: From electronic version of the journal
(End) Emmanuelle Perret [CDS] 12-Jun-2018
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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