J/ApJ/929/173 Swift/BAT 14-195keV obs. of FRB 180916.J0158+65 (Laha+, 2022)
Limits on the hard X-ray emission from the periodic fast radio burst
FRB 180916.J0158+65.
Laha S., Wadiasingh Z., Parsotan T., Lien A., Younes G., Zhang B.,
Bradley Cenko S., Troja E., Oates S., Nicholl M., Meyer E.,
Becerra Gonzalez J., Ghosh R., Klingler N.
<Astrophys. J., 929, 173 (2022)>
=2022ApJ...929..173L 2022ApJ...929..173L
ADC_Keywords: Radio sources; X-ray sources; Transient
Keywords: Radio transient sources
Abstract:
FRB 180916.J0158+65 is one of the nearest, periodically repeating, and
actively bursting fast radio bursts (FRBs) that has been localized to
the outskirts of a spiral galaxy. In this work we study the FRB with
the hard X-ray 14-195keV data from the Burst Alert Telescope (BAT) on
board The Neil Gehrels Swift Observatory. BAT uses coded mask
technology giving a localization of ≲3' in the hard X-ray band, along
with an accurate background estimation. BAT has been observing the
source location in survey mode since 2020 February. The survey mode
observations involve background subtracted spectra, integrated over a
time span ranging 300-2000s at the source location (from
2022 February-2022 January). We analyzed all the ∼230 survey mode
observations from BAT and checked for any signal in any of the
observations. We did not detect any signal at >5σ confidence
level in any of the observations. We could estimate a 5σ upper
limit on the 14-195keV flux, which ranged between
4.5x10-10-7.6x10-9erg/cm2/s. At the source distance this relates
to a 5σ upper limit on a luminosity of
5.08x1044-8.5x1045erg/s. With this estimate, we could rule out any
persistent X-ray emission at the source location for these snapshots
of BAT observations.
Description:
FRB 180916 has been observed by Swift BAT ∼220 times from
2020 February-2022 January in survey mode. We checked in the CHIME/FRB
catalog (Amiri+ 2021, J/ApJS/257/59) for the time stamps of the
∼90 radio bursts detected to date from FRB 180916. Unfortunately, none
of the CHIME-reported burst times were coincident with our BAT survey
observations. We also note that there are no time-tagged event data
available in the BAT archive where FRB 180916 is in the field of view
of BAT.
The BAT survey data sets were downloaded from HEASARC, and every
survey observation has one or more pointings and hence different
integration times.
Objects:
-------------------------------------------------------------
RA (ICRS) DE Designation(s)
-------------------------------------------------------------
01 58 00.75 +65 43 00.3 FRB 180916.J0158+65 = FRB 180916
-------------------------------------------------------------
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 74 205 List of Swift-BAT survey-mode observations of
FRB 180916.J0158+65
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See also:
B/swift : Swift Master Catalog (HEASARC, 2004-)
J/ApJ/904/L21 : NICER SGR 1935+2154 burst & persistent emission (Younes+, 2020)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 I011 --- ObsID [13201002/13201200] Swift-BAT Observation ID
13- 23 I11 --- ID [20200341843/20212770003] Pointing ID number
25- 35 F11.1 --- Start [602448230/654998591] Start time, Mission
elapsed time
37- 40 I4 yr Obs.Y [2020/2021] Start time, UTC, Year
42- 44 A3 "month" Obs.M Start time, UTC, Month
46- 47 I2 d Obs.D Start time, UTC, Day in Month
49- 50 I2 h Obs.h Start time, UTC, Hour
52- 53 I2 min Obs.m Start time, UTC, Minute
55- 56 I2 s Obs.s Start time, UTC, Second
58- 63 F6.1 s Exptime [150/1766] Exposure time
65- 74 A10 mW/m2 Flux 5σ upper limit Flux, 14-195keV, erg/s/cm2
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 12-Mar-2024