GECAM detection of a bright type-I X-ray burst from 4U 0614+09: confirmation its spin frequency at 413 Hz

Abstract

One month after launching Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM), a bright thermonuclear X-ray burst from 4U~0614+09, was observed on January 24, 2021. We report the time-resolved spectroscopy of the burst and a burst oscillation detection at 413 Hz with a fractional amplitude 3.4\% (rms). This coincides with the burst oscillation previously discovered with \textit{Swift}/BAT \citep{Strohmayer2008}, and therefore confirms the spin frequency of this source. This burst is the brightest one in the normal bursts (except the superburst) ever detected from 4U~0614+09, which leads to an upper limit of distance estimation as 3.1 kpc. The folded light curve during the burst oscillation shows a multi-peak structure, which is the first case observed during a single burst oscillation in nonpulsating sources. The multi-peak profile could be due to additional harmonics of the burst oscillation, which is corresponding to several brighter/fainter spots at the stellar surface.

References in corpus (23)

• On the Absorption of X-rays in the Interstellar Medium
• Thermonuclear (type-I) X-ray bursts observed by the Rossi X-ray Timing Explorer
• Photospheric radius expansion X-ray bursts as standard candles
• Carbon Flashes in the Heavy Element Ocean on Accreting Neutron Stars
• Neutron star stiff equation of state derived from cooling phases of the X-ray burster 4U 1724-307
• Thermonuclear burst oscillations
• On the Amplitude of Burst Oscillations in 4U 1636-54: Evidence for Nuclear Powered Pulsars
• Optical spectra of the carbon-oxygen accretion discs in the ultra-compact X-ray binaries 4U 0614+09, 4U 1543-624 and 2S 0918-549
• R-Modes on Rapidly Rotating, Relativistic Stars: I. Do Type-I Bursts Excite Modes in the Neutron-Star Ocean?
• Energy Response of GECAM Gamma-Ray Detector Based on LaBr3:Ce and SiPM Array
• What ignites on the neutron star of 4U 0614+091?
• The influence of accretion geometry on the spectral evolution during thermonuclear (type-I) X-ray bursts
• NuSTAR Observations of the Accreting Atolls GX 3+1, 4U 1702-429, 4U 0614+091, and 4U 1746-371
• On the Frequency Evolution of X-ray Brightness Oscillations During Thermonuclear X-ray Bursts: Evidence for Coherent Oscillations
• Thermonuclear X-ray Bursts: Theory vs. Observations
• VLT spectroscopy and non-LTE modeling of the C/O-dominated accretion disks in two ultracompact X-ray binaries
• Discovery of the Spin Frequency of 4U 0614+09 with SWIFT/BAT
• A uniform search for thermonuclear burst oscillations in the RXTE legacy dataset
• X-ray Burst Oscillations: From Flame Spreading to the Cooling Wake
• Accretion heated atmospheres of X-ray bursting neutron stars
• NICER Observation of Unusual Burst Oscillations in 4U 1728-34
• Burning in the tail: implications for a burst oscillation model
• The Fermi-GBM X-ray burst monitor: thermonuclear bursts from 4U 0614+09

Cited by in corpus (4)

• Observation of spectral lines in the exceptional GRB 221009A
• Relation between the keV-MeV and TeV emission of GRB 221009A and its implications
• The GECAM Ground Search System for Gamma-ray Transients
• Extending the short gamma-ray burst population from sub-threshold triggers in Fermi/GBM and GECAM data and its implications