J/ApJ/860/173 Time delays in BATSE energy channels for 668 GRBs (Yu+, 2018)
A new method to test the Einstein's weak equivalence principle.
Yu H., Xi S.-Q., Wang F.-Y.
<Astrophys. J., 860, 173-173 (2018)>
=2018ApJ...860..173Y 2018ApJ...860..173Y (SIMBAD/NED BibCode)
ADC_Keywords: GRB; Redshifts
Keywords: cosmology: observations; gravitation
Abstract:
The Einstein's weak equivalence principle (WEP) is one of the
foundational assumptions of general relativity and some other gravity
theories. In the theory of parametrized post-Newtonian (PPN), the
difference between the PPN parameters γ of different particles
or the same type of particle with different energies, Δγ,
represents the violation of WEP. Current constraints on Δγ
are derived from the observed time delay between correlated particles
of astronomical sources. However, the observed time delay is
contaminated by other effects, such as the time delays due to
different particle emission times, the potential Lorentz invariance
violation, and none-zero photon rest mass. Therefore, current
constraints are only upper limits. Here, we propose a new method to
test WEP based on the fact that the gravitational time delay is
direction-dependent while others are not. This is the first method
that can naturally correct other time-delay effects. Using the
time-delay measurements of BASTE gamma-ray burst sample and the
gravitational potential of local super galaxy cluster Laniakea, we
find that the constraint on Δγ of different energy photons
can be as low as 10-14. In the future, if more gravitational wave
events and fast radio bursts with much more precise time-delay
measurements are observed, this method can give a reliable and tight
constraint on WEP.
Description:
We choose 668 gamma-ray bursts (GRBs) in our sample coming from BATSE
(Hakkila+ 2007, J/ApJS/169/62; Yonetoku+ 2004, J/ApJ/609/935
and Goldstein+ 2013, J/ApJS/208/21).
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 113 668 The time delay data used in this work
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See also:
IX/20 : The Fourth BATSE Burst Revised Catalog (Paciesas+ 1999)
J/ApJ/609/935 : Gamma-ray burst formation rate (Yonetoku+, 2004)
J/ApJS/169/62 : GRB database of spectral lags (Hakkila+, 2007)
J/ApJS/208/21 : The BATSE 5B GRB spectral catalog (Goldstein+, 2013)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 4 I4 --- Trigger [105/8116] BATSE trigger number
6- 10 F5.2 --- z [0.11/11.97] Redshift
12- 15 F4.2 --- e_z [0.01/7.4] Lower uncertainty on z
17- 21 F5.2 --- E_z [0.01/38.83] Upper uncertainty on z
23- 28 F6.2 deg RAdeg [2/359] Right ascension (J2000)
30- 35 F6.2 deg DEdeg [-88/83] Declination (J2000)
37- 42 F6.3 s TD21 [-0.4/3.3] Time-delay between Ch1 and Ch2 (1)
44- 48 F5.3 s e_TD21 [0.001/0.5] TD21 uncertainty
50- 55 F6.3 s TD31 [-1.4/6]? Time-delay between Ch1 and Ch3 (1)
57- 61 F5.3 s e_TD31 [0.001/2]? TD31 uncertainty
63- 68 F6.3 s TD32 [-0.7/5]? Time-delay between Ch2 and Ch3 (1)
70- 74 F5.3 s e_TD32 [0.001/0.6]? TD32 uncertainty
76- 81 F6.3 s TD41 [-7.5/7.5]? Time-delay between Ch1 and Ch4 (1)
83- 87 F5.3 s e_TD41 [0.001/2.4]? TD41 uncertainty
89- 94 F6.3 s TD42 [-6/11]? Time-delay between Ch2 and Ch4 (1)
96- 100 F5.3 s e_TD42 [0.001/4.3]? TD42 uncertainty
102- 107 F6.3 s TD43 [-6.7/4.6]? Time-delay between Ch3 and Ch4 (1)
109- 113 F5.3 s e_TD43 [0.001/5.7]? TD43 uncertainty
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Note (1): Since BATSE has 4 energy bands, Ch1: 25-60keV, Ch2: 60-110keV,
Ch3: 110-325keV and Ch4: >325keV, there are at most 6 time-delay
measurement for each GRB.
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History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 29-Sep-2023