J/MNRAS/492/3904 LIGO and Virgo third observing run with GRANDMA (Antier+, 2020)
The first six months of the Advanced LIGO's and Advanced Virgo's third observing
run with GRANDMA.
Antier S., Agayeva S., Aivazyan V., Alishov S., Arbouch E., Baransky A.,
Barynova K., Bai J.M., Basa S., Beradze S., Bertin E., Berthier J.,
Blazek M., Boer M., Burkhonov O., Burrell A., Cailleau A., Chabert B.,
Chen J.C., Christensen N., Coleiro A., Cordier B., Corre D., Coughlin M.W.,
Coward D., Crisp H., Delattre C., Dietrich T., Ducoin J.-G., Duverne P.-A.,
Marchal-Duval G., Gendre B., Eymar L., Fock-Hang P., Han X., Hello P.,
Howell E.J., Inasaridze R., Ismailov N., Kann D.A., Kapanadze G., Klotz A.,
Kochiashvili N., Lachaud C., Leroy N., Le Van Su A., Lin W.L., Li W.X.,
Lognone P., Marron R., Mo J., Moore J., Natsvlishvili R., Noysena K.,
Perrigault S., Peyrot A., Samadov D., Sadibekova T., Simon A., Stachie C.,
Teng J.P., Thierry P., Thone C.C., Tillayev Y., Turpin D.,
de Ugarte Postigo A., Vachier F., Vardosanidze M., Vasylenko V., Vidadi Z.,
Wang X.F., Wang C.J., Wei J., Yan S.Y., Zhang J.C., Zhang J.J., Zhang X.H.
<Mon. Not. R. Astron. Soc., 492, 3904-3927 (2020)>
=2020MNRAS.492.3904A 2020MNRAS.492.3904A (SIMBAD/NED BibCode)
ADC_Keywords: Gravitational wave ; Transient ; Black holes ; Stars, neutron ;
Photometry ; Spectroscopy ; Optical ; Infrared
Keywords: gravitational waves - methods: observational - stars: neutron
Abstract:
We present the Global Rapid Advanced Network Devoted to the
Multi-messenger Addicts (GRANDMA). The network consists of 21
telescopes with both photometric and spectroscopic facilities. They
are connected together thanks to a dedicated infrastructure. The
network aims at coordinating the observations of large sky position
estimates of transient events to enhance their follow-up and reduce
the delay between the initial detection and optical confirmation. The
GRANDMA programme mainly focuses on follow-up of gravitational-wave
alerts to find and characterize the electromagnetic counterpart during
the third observational campaign of the Advanced LIGO and Advanced
Virgo detectors. But it allows for follow-up of any transient alerts
involving neutrinos or gamma-ray bursts, even those with poor spatial
localization. We present the different facilities, tools, and methods
we developed for this network and show its efficiency using
observations of LIGO/Virgo S190425z, a binary neutron star merger
candidate. We furthermore report on all GRANDMA follow-up observations
performed during the first six months of the LIGO-Virgo observational
campaign, and we derive constraints on the kilonova properties
assuming that the events' locations were imaged by our telescopes.
Description:
The GRANDMA consortium presented in this paper, which is a global
network of 21 telescopes with both photometric and spectroscopic
facilities, located in 15 different observatories, aims to face the
challenges of time-domain astronomy; in particular, it is set up for
the case of large uncertainties in the localization of the transient
phenomena as presented in Coughlin et al. (2019MNRAS.489.5775C 2019MNRAS.489.5775C). The
network morphology has 24-h coverage and large availability of the
telescopes, which helps to rapidly scan the GW sky localization area
to ∼18mag.
The GRANDMA consortium followed up 27/33 alerts during the first six
months of the O3 campaign, as shown in Table 3 for the BBH merger
candidates and Table 4 for the systems containing at least one neutron
star based on LIGO-Virgo low-latency results. Links to all the sky
localizations of the alerts are given in Table A1.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 21 List of telescopes of the GRANDMA consortium and
their photometric performance when using their
standard setup
table2.dat 64 4 List of telescopes of the GRANDMA consortium
with spectroscopic capabilities
table3.dat 87 59 Summary of the GRANDMA observations during the
first six months for BBH candidates
table4.dat 89 47 Summary of the GRANDMA observations during the
first six months for binary neutron star or
neutron star-black hole merger candidates
tablea1.dat 220 27 Sky coverage observations of the GRANDMA
consortium during the first six months
tableb1.dat 70 19 List of tiled observations performed by the
TAROT network for 190425z
tableb2.dat 120 183 List of galaxies, enclosed in the 3D probability
region of S190425z
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Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Tel Telescope
16- 33 A18 --- Loc Location of the telescope
35- 38 F4.2 m Aper Aperture of the telescope
40- 48 A9 deg FoV Field of view
50- 65 A16 --- Filters Filters used
67- 70 F4.1 mag Mag3s 3-σ limit in AB magnitude
72- 74 I3 s ExpTime Exposure time corresponding to the 3-σ
limit in AB magnitude
76- 80 A5 --- Filter Fiter corresponding to the 3-σ limit
in AB magnitude
82- 86 A5 h Nightslot Maximum night slot (UTC)
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Byte-by-byte Description of file: table2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 19 A19 --- Tel/Inst Telescope/Instrument
21- 35 A15 --- Loc Location of the telescope
37- 56 A20 --- wvlrange Wavelength range of the instrument
58- 61 I4 --- SpRes Spectral resolution λ/Δλ
63- 64 I2 --- limmag Limiting magnitude in 1h
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Byte-by-byte Description of file: table3.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
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1- 9 A9 --- Alert Alert designation
11 A1 --- f_Alert [a] Flag on Alert (G1)
13- 21 A9 "h:m:s" Time UTC time
23- 25 A3 --- Type [MG /BBH] Type of the alert (Mass-gap event
or binary black hole)
27- 29 I3 % L_Type Probability of the reported alert type
31- 34 I4 Mpc Dist Distance
36- 39 I4 Mpc e_Dist Error on Dist
41- 44 I4 deg2 0.9cr 90 per cent credible region of the latest
sky localization area sent by LIGO-Virgo
46- 60 A15 --- Tel Telescope (1)
62- 65 F4.1 h dt ? Delay with respect to the gravitational
wave trigger δt
67- 71 F5.1 h Dt ? Duration of the observations ΔT
73- 77 A5 mag limmag Limiting magnitude
79- 83 F5.2 % Prob ? Coverage of GRANDMA compared to the latest
revision of the sky localization area in
percentage
85- 87 I3 deg2 Area ? Coverage of GRANDMA
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Note (1): From 2019 May 19 to 2019 June 2, TRE and TCH were under maintenance
and there were bad observational conditions at the TCA site. S190924h
was not observed due to moon constraints.
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Alert Alert designation
11 A1 --- f_Alert [a] Flag on Alert (G1)
13- 20 A8 "h:m:s" Time UTC time
22- 25 A4 --- Type [NSBH/BNS ] Type of the alert (neutron star
black hole merger or binary neutron star)
27- 28 I2 % L_Type Probability of the reported alert type
30- 32 I3 Mpc Dist Distance
34- 36 I3 Mpc e_Dist Error on Dist
38- 42 I5 deg2 0.9cr 90 per cent credible region of the latest
sky localization area sent by LIGO-Virgo
44- 57 A14 --- Tel Telescope
59- 64 F6.2 h dt Delay with respect to the gravitational wave
trigger δt
66- 70 F5.1 h Dt Duration of the observations ΔT
72- 76 A5 mag limmag Limiting magnitude
78 A1 --- l_Prob Limit flag on Prob
80- 83 F4.1 % Prob Coverage of GRANDMA compared to the latest
revision of the sky localization area in
percentage
85 A1 --- l_Area Limit flag on Area
87- 89 I3 deg2 Area Coverage of GRANDMA
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Byte-by-byte Description of file: tablea1.dat
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Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 A9 --- Alert Alert designation
11- 75 A65 --- SkyLoc GRANDMA sky localization coverage Link
77-220 A144 --- GCN GCN report
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Byte-by-byte Description of file: tableb1.dat
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Bytes Format Units Label Explanations
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1- 9 A9 --- Tel Telescope used (TAROT-TRE, TAROT-TCA or
TAROT-TCH)
11- 20 A10 "Y:M:D" Datest Date of the start of the observation
22- 29 A8 "h:m:s" Timest Time of the start of the observation
31- 40 A10 "Y:M:D" Dateend Date of the end of the observation
42- 49 A8 "h:m:s" Timeend Time of the end of the observation
51- 57 F7.3 deg RAdeg Right ascension (J2000)
59- 65 F7.3 deg DEdeg Declination (J2000)
67- 70 F4.2 % Cov 2D spatial probability of the LALInference GW
skymap enclosed in a given tile
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Byte-by-byte Description of file: tableb2.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 A14 --- Tel Telescope used
16- 25 I10 "Y:M:D" Datest Date of the start of the observation
27- 34 A8 "h:m:s" Timest Time at the start of the observation
36- 45 I10 "Y:M:D" Dateend Date of the end of the observation
47- 54 A8 "h:m:s" Timeend Time of the end of the observation
56- 89 A34 --- Name Galaxy name
91- 98 A8 --- OName Alternative galaxy name
100-106 F7.3 deg RAdeg Right ascension (J2000)
108-114 F7.3 deg DEdeg Declination (J2000)
116-120 F5.1 Mpc Dist Distance
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Global Notes:
Note (G1): Flag as follows:
a = Only 'the bayestar sky localization' was available
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History:
From electronic version of the journal
(End) Ana Fiallos [CDS] 24-Mar-2023