J/ApJ/922/115 Additional bursts at 1.4GHz for FRB 121102 (Aggarwal+, 2021)
Comprehensive analysis of a dense sample of FRB 121102 bursts.
Aggarwal K., Agarwal D., Lewis E.F., Anna-Thomas R., Tremblay J.C.,
Burke-Spolaor S., McLaughlin M.A., Lorimer D.R.
<Astrophys. J., 922, 115 (2021)>
=2021ApJ...922..115A 2021ApJ...922..115A
ADC_Keywords: Radio sources; Transient
Keywords: Radio transient sources ; Extragalactic radio sources ;
Radio bursts ; Astronomy data analysis ; Markov chain Monte Carlo ;
Observational astronomy
Abstract:
We present an analysis of a densely repeating sample of bursts from
the first repeating fast radio burst, FRB 121102. We reanalyzed the
data used by Gourdji+ (2019ApJ...877L..19G 2019ApJ...877L..19G) and detected 93 additional
bursts using our single-pulse search pipeline. In total, we detected
133 bursts in three hours of data at a center frequency of 1.4GHz
using the Arecibo telescope, and develop robust modeling strategies to
constrain the spectro-temporal properties of all of the bursts in the
sample. Most of the burst profiles show a scattering tail, and burst
spectra are well modeled by a Gaussian with a median width of 230MHz.
We find a lack of emission below 1300MHz, consistent with previous
studies of FRB 121102. We also find that the peak of the log-normal
distribution of wait times decreases from 207 to 75s using our larger
sample of bursts, as compared to that of Gourdji et al. Our
observations do not favor either Poissonian or Weibull distributions
for the burst rate distribution. We searched for periodicity in the
bursts using multiple techniques, but did not detect any significant
period. The cumulative burst energy distribution exhibits a broken
power-law shape, with the lower- and higher-energy slopes of
-0.4±0.1 and -1.8±0.2, with the break at (2.3±0.2)x1037erg.
Description:
In this paper, we reanalyze the observations for FRB 121102 previously
reported by Gourdji+ (2019ApJ...877L..19G 2019ApJ...877L..19G) and present the detection
of an additional 93 bursts, for a full sample of 133 bursts in these
observations. The observations were carried out with the 305m William
E. Gordon Telescope at the Arecibo Observatory with the L-Wide
receiver and recorded using the Puerto Rican Ultimate Pulsar
Processing Instrument (PUPPI).
Objects:
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RA (ICRS) DE Designation(s)
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05 32 09.60 +33 05 13.4 FRB 121102 = FRB 20121102A
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table5.dat 137 144 Properties of all the bursts presented in this analysis
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See also:
J/ApJ/605/759 : Multifrequency obs. of radio pulse broadening (Bhat+, 2004)
J/MNRAS/423/1351 : Energy distribution in pulsars (Burke-Spolaor+, 2012)
J/other/PASA/33.45 : FRBCAT: Fast Radio Burst (FRB) Catalog (Petroff+, 2016)
J/other/Nat/598.267 : List of radio bursts (Li+, 2021)
J/ApJS/257/59 : 1st CHIME/FRB Fast Radio Burst Cat. (CHIME/FRB Col.+, 2021)
Byte-by-byte Description of file: table5.dat
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Bytes Format Units Label Explanations
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1- 6 A6 --- ID Burst identifier; chronologically ordered (1)
7 A1 --- f_ID [*d] Flag on ID (2)
9- 12 I4 MHz muf [0/3100] Mean of the spectra, µf
14- 17 I4 MHz E_muf [1/1490] Upper 1σ uncertainty in muf
19- 22 I4 MHz e_muf [1/2000] Lower 1σ uncertainty in muf
24- 27 I4 MHz sigmaf [31/3000] Width of the spectra, σf
29- 32 I4 MHz E_sigmaf [1/2790] Upper 1σ uncertainty in sigmaf
34- 37 I4 MHz e_sigmaf [1/2000] Lower 1σ uncertainty in sigma_f
39- 45 F7.4 Jy.ms S [0/20] Component fluence
47- 53 F7.4 Jy.ms E_S [0.0007/26.2] Upper 1σ uncertainty in S
55- 61 F7.4 Jy.ms e_S [0.0007/10] Lower 1σ uncertainty in S
63- 78 F16.10 d MJD [57644.4/57645.5] Modified Julian Date of
mean pulse profile, µt (3)
80- 84 E5.0 d e_MJD [4e-10/2e-07] The 1σ uncertainty in MJD
86- 89 F4.2 ms sigmat [0/8.3] Profile width, στ
91- 95 F5.2 ms E_sigmat [0.02/10] Upper 1σ uncertainty in sigmat
97-101 F5.2 ms e_sigmat [0.02/10] Lower 1σ uncertainty in sigmat
103-106 F4.2 ms tau [0.12/3]? Scattering timescale at 1GHz
108-111 F4.2 ms E_tau [0.02/3.6]? Upper 1σ uncertainty in tau
113-116 F4.2 ms e_tau [0.01/1]? Lower 1σ uncertainty in tau
118-123 F6.2 pc/cm3 DM [551/600] Dispersion measure
125-130 F6.2 pc/cm3 E_DM [0.03/100] Upper 1σ uncertainty in DM
132-137 F6.2 pc/cm3 e_DM [0.03/200] Lower 1σ uncertainty in DM
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Note (1): Individual component number (N) for multi-component bursts are
appended to the burst IDs.
Note (2): Flag as follows:
* = burst modeled only using curve_fit. The errors on these bursts could
be unreliable and may be either under or over-estimated.
d = burst that extends beyond the observable bandwidth. These may also
have unreliable estimates of spectra parameters and fluence
(see Section 3.5.7). The fluence and spectral parameters could be
unconstrained.
Note (3): This can be considered as the arrival time of the pulse. It is
referenced to the solar system barycenter, after correcting to
infinite frequency using a DM of 560.5pc/cm3.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Mar-2023