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J/ApJ/848/L29        Opt. follow-up of GW170817 counterpart        (Diaz+, 2017)

Observations of the first electromagnetic counterpart to a gravitational-wave source by the TOROS Collaboration. Diaz M.C., Macri L.M., Garcia Lambas D., Mendes de Oliveira C., Nilo Castellon J.L., Ribeiro T., Sanchez B., Schoenell W., Abramo L.R., Akras S., Alcaniz J.S., Artola R., Beroiz M., Bonoli S., Cabral J., Camuccio R., Castillo M., Chavushyan V., Coelho P., Colazo C., Costa-Duarte M.V., Cuevas Larenas H., DePoy D.L., Dominguez Romero M., Dultzin D., Fernandez D., Garcia J., Girardini C., Goncalves D.R., Goncalves T.S., Gurovich S., Jimenez-Teja Y., Kanaan A., Lares M., Lopes de Oliveira R., Lopez-Cruz O., Marshall J.L., Melia R., Molino A., Padilla N., Penuela T., Placco V.M., Quinones C., Ramirez Rivera A., Renzi V., Riguccini L., Rios-Lopez E., Rodriguez H., Sampedro L., Schneiter M., Sodre L., Starck M., Torres-Flores S., Tornatore M., Zadrozny A. <Astrophys. J., 848, L29 (2017)> =2017ApJ...848L..29D
ADC_Keywords: Gravitational wave; Stars, neutron; Photometry, SDSS Keywords: gamma-ray burst: individual (170817A) ; stars: neutron Abstract: We present the results of prompt optical follow-up of the electromagnetic counterpart of the gravitational-wave event GW170817 by the Transient Optical Robotic Observatory of the South Collaboration. We detected highly significant dimming in the light curves of the counterpart (Δg=0.17±0.03mag, Δr=0.14±0.02mag, Δi=0.10±0.03mag) over the course of only 80 minutes of observations obtained ∼35hr after the trigger with the T80-South telescope. A second epoch of observations, obtained ∼59hr after the event with the EABA 1.5m telescope, confirms the fast fading nature of the transient. The observed colors of the counterpart suggest that this event was a "blue kilonova" relatively free of lanthanides. Description: On 2017 August 18 (∼35hr after the GW trigger) we observed the transient using the T80-South telescope (T80) located at CTIO. We obtained 16, 15, and 15 one-minute exposures through SDSS g, r, and i filters, respectively, at airmass values from 1.35 to 1.97 over the course of 80 minutes. The typical seeing was ∼1.8". On 2017 August 19 (∼59hr after the GW trigger) we imaged the same source using the 1.54m telescope located at the Estacion Astrofisica de Bosque Alegre (EABA). Objects: ---------------------------------------------------------- RA (2000) DE Designation(s) ---------------------------------------------------------- 13 09 48.09 -23 22 53.3 GrW 170817 = NAME AT 2017gfo ---------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 23 48 Time-series photometry
See also: J/ApJ/750/99 : The Pan-STARRS1 photometric system (Tonry+, 2012) J/ApJ/843/16 : Galaxy groups within 3500km/s (Kourkchi+, 2017) J/ApJ/848/L16 : Counterpart of GW170817. I. DECam obs. (Soares-Santos+, 2017) J/ApJ/848/L33 : Opt. follow-up of GW events with LCO (Arcavi+, 2017) J/ApJ/851/L21 : UV-NIR obs. compilation of GW170817 counterpart (Villar+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 F6.4 d Time [1.4/2.5] Time since GW trigger 8 A1 --- Band [gir] Band in SDSS system 10- 15 F6.3 mag mag [17.7/19.2] Apparent magnitude in Band 17- 21 F5.3 mag e_mag [0.02/0.06] Uncertainty in mag 23 A1 --- Note [ab] Addition note (1)
Note (1): Note as follows: a = assuming r-i=0.19±0.03mag. b = assuming r-i=0.84±0.08mag.
History: From electronic version of the journal
(End) Prepared by [AAS], 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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