J/ApJS/247/49 gri obs. of the blazar S5 0716+714 (2017-2019) (Xiong+, 2020)
Multicolor optical monitoring of the blazar S5 0716+714 from 2017 to 2019.
Xiong D., Bai J., Fan J., Yan D., Gu M., Fan X., Mao J., Ding N., Xue R.,
Yi W.
<Astrophys. J. Suppl. Ser., 247, 49 (2020)>
=2020ApJS..247...49X 2020ApJS..247...49X
ADC_Keywords: BL Lac objects; Photometry, ugriz
Keywords: BL Lacertae objects ; Active galactic nuclei ; Galaxy jets ;
Galaxy photometry
Abstract:
We continuously monitored the blazar S5 0716+714 in the optical g, r,
and i bands from 2017 November 10 to 2019 June 6. The total number of
observations is 201 nights including 26973 data points. This is a very
large quasi-simultaneous multicolor sample for the blazar. The average
time spans and time resolutions are 3.4hr and 2.9min per night,
respectively. During the period of observations, the target source in
the r band brightens from 14.16m to 12.29m together with five
prominent subflares, and then becomes fainter to 14.76m, and again
brightens to 12.94m with seven prominent subflares. For the long-term
variations, we find a strong flatter-when-brighter (FWB) trend at a
low-flux state and then a weak FWB trend at a higher-flux state. A
weak FWB trend at a low-flux state and then a strong FWB trend at a
higher-flux state are also reported. Most subflares show strong FWB
trends, except for two flares with a weak FWB trend. The particle
acceleration and cooling mechanisms together with the superposition of
the different FWB slopes from the subflares likely explain the optical
color behaviors. A scenario of bent jet is discussed.
Description:
We continuously monitored the blazar S5 0716+714 in optical gri bands
from 2017 November 10 to 2019 June 6.
Optical observations were carried out using the 60cm BOOTES-4
auto-telescope, which was in a global network of robotic
observatories. The fourth station of the BOOTE, BOOTES-4, is located
at the Lijiang Observatory of the Yunnan Observatories of China
(altitude of 3193m).
The total number of observations is 201 nights including 26973 data
points (8991 points per band). The observational log in the r band is
given in Table 1. The log from other bands are almost the same as that
of Table 1.
Objects:
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RA (ICRS) DE Designation(s)
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07 21 53.45 +71 20 36.4 S5 0716+714 = CGRaBS J0721+7120
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 20 201 The observational log in the r Band
table2.dat 98 8990 The observational data
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See also:
J/A+A/327/61 : BV(RI)c photometry of S5 0716+714 (Ghisellini+ 1997)
J/A+AS/132/83 : BVRI photometry of 7 BL Lac objects (Bai+ 1998)
J/A+AS/136/455 : BVRI photometry of 3 BL Lac objects (Bai+, 1999)
J/A+A/402/151 : S5 0716+714 UBVRI photometry (Raiteri+, 2003)
J/A+A/450/39 : BVRI photometry of 8 red blazars (Gu+, 2006)
J/AJ/133/1599 : B'V'R' photometry of S5 0716+714 (Wu+, 2007)
J/AJ/135/1384 : R-band variability in 5 blazars (Gupta+, 2008)
J/MNRAS/385/823 : UBVRI light curves of OJ 287 (Zheng+, 2008)
J/ApJS/185/511 : Optical microvariability of S5 0716+714 (Poon+, 2009)
J/ApJ/716/30 : SED of Fermi bright blazars (Abdo+, 2010)
J/ApJ/722/520 : Gamma-ray light curves of Fermi blazars (Abdo+, 2010)
J/ApJ/731/118 : R-band variability in blazar S5 0716+71 (Chandra+, 2011)
J/ApJ/768/40 : R-band & polarimetry of S5 0716+71 (Larionov+, 2013)
J/ApJS/213/26 : Optical light curves of PHL1811 and 3C273 (Fan+, 2014)
J/A+A/573/A50 : Multiwavelength obs. of Mrk 501 in 2008 (Aleksic+, 2015)
J/ApJS/218/18 : 2004-2012 BVRI obs. of the blazar S5 0716+714 (Dai+, 2015)
J/ApJS/226/20 : X-ray, opt. & radio SEDs of Fermi blazars (Fan+, 2016)
J/ApJS/222/24 : VRI LCs of BL Lac object Mrk 501 (2010-2015) (Xiong+, 2016)
J/ApJ/837/45 : 2006-2012 Rc-band & 4.8GHz obs. of AO 0235+164 (Fan+, 2017)
J/AJ/154/42 : BVRI photometry of S5 0716+714 in 2012 (Hong+, 2017)
J/ApJS/229/21 : VRI monitoring of the QSO 3C 273 in 2005-2016 (Xiong+, 2017)
J/ApJS/235/39 : Jet properties of γ-ray-loud 3FGL AGNs (Chen, 2018)
J/ApJ/856/80 : 6-yr optical monitoring of the FSRQ 3C 454.3 (Fan+, 2018)
J/A+A/619/A45 : S5 0716+714 multi-wavelength curves (MAGIC Col.+, 2018)
J/A+A/620/A185 : Long-term optical monitoring of TeV Blazars (Nilsson+, 2018)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 5 I5 d MJD [58067/58640] Modified Julian Date
7- 9 I3 --- Npts [1/245] Number of data points
11- 15 F5.2 h Span [0.03/10.8]? Time spans
17- 20 F4.2 min Res [1.1/6.2]? Time resolutions
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 10 F10.4 d MJDg [58067.89/58640.65] Modified Julian Date
of g band observation
12- 18 F7.4 mag gmag [12.7/15.4] Apparent magnitude in g band
20- 25 F6.4 mag s_gmag [0.001/0.1] Poisson error in gmag
27- 32 F6.4 mag e_gmag [0/0.15] RMS error in gmag
34- 43 F10.4 d MJDr [58067.89/58640.65] Modified Julian Date
of r band observation
45- 51 F7.4 mag rmag [12.35/14.83] Apparent magnitude in r band
53- 58 F6.4 mag s_rmag [0.0007/0.07] Poisson error in rmag
60- 65 F6.4 mag e_rmag [0.002/0.2] RMS error in rmag
67- 76 F10.4 d MJDi [58067.89/58640.65] Modified Julian Date
of i band observation
78- 84 F7.4 mag imag [12.1/14.5] Apparent magnitude in i band
86- 91 F6.4 mag s_imag [0.0007/0.2] Poisson error in imag
93- 98 F6.4 mag e_imag [0.0005/0.2] RMS error in imag
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 10-Jun-2020