Unveil A Peculiar Light Curve Pattern of Magnetar Burst with GECAM observations of SGR J1935+2154
arXiv:2510.11385 · doi:10.3847/1538-4357/ae0cbe
Abstract
Magnetar X-ray Burst (MXB) is usually composed of a single pulse or multiple pulses with rapid rise and brief duration mostly observed in hard X-ray (soft gamma-ray) band. Previous work studied the temporal behavior of some magnetar bursts and employed the Fast Rise Exponential Decay (FRED) model to fit pulses of MXB. However, whether there is other kind of pulse shape has not been explored. In this study, we systematically examined light curve of MXBs from SGR J1935+2154 detected by GECAM between 2021 and 2022. We find that there are different light curve morphologies. Especially, we discover a peculiar and new pattern, Exponential Rise and Cut-Off Decay (ERCOD), which is significantly different from FRED and could be well described by a mathematical function we proposed. We find that MXBs with ERCOD shape are generally longer in duration, brighter in the peak flux, and harder in spectrum. We note that the ERCOD shape is not unique to SGR J1935+2154 but also present in other magnetars. This new light curve pattern may imply a special burst and radiation mechanism of magnetar.
arXiv comment13 pages, 5 figures, accepted to publication on ApJ
References in corpus (34)
- Magnetars
- The McGill Magnetar Catalog
- A fast radio burst associated with a Galactic magnetar
- A bright millisecond-duration radio burst from a Galactic magnetar
- Gamma-ray bursts from internal shocks in a relativistic wind: temporal and spectral properties
- INTEGRAL discovery of a burst with associated radio emission from the magnetar SGR 1935+2154
- Expanding Relativistic Shells and Gamma-Ray Burst Temporal Structure
- HXMT Identification of a non-thermal X-ray burst from SGR J1935+2154 and with FRB 200428
- Long-lag, Wide-Pulse Gamma-Ray Bursts
- A peculiar hard X-ray counterpart of a Galactic fast radio burst
- Statistical properties of SGR 1900+14 bursts
- Statistical properties of SGR 1806-20 bursts
- No pulsed radio emission during a bursting phase of a Galactic magnetar
- A bright gamma-ray flare interpreted as a giant magnetar flare in NGC 253
- X-ray and radio observations of the magnetar SGR J1935+2154 during its 2014, 2015, and 2016 outbursts
- Fast radio bursts and their high-energy counterpart from magnetar magnetospheres
- Burst properties of the most recurring transient magnetar SGR J1935+2154
- Fermi/GBM View of the 2019 and 2020 Burst Active Episodes of SGR J1935+2154
- Pair separation in parallel electric field in magnetar magnetosphere and narrow spectra of fast radio bursts
- Konus catalog of SGR activity to 2000
- GRB 200415A: A Short Gamma-Ray Burst from a Magnetar Giant Flare?
- A Magnetar-Asteroid Impact Model for FRB 200428 Associated with an X-ray Burst from SGR 1935+2154
- The design and performance of GRD onboard the GECAM satellite
- On the magnetospheric origin of Repeating Fast Radio Bursts
- Gamma-Ray Burst and Relativistic Shells: The Surface Filling Factor
- Insight-HXMT dedicated 33-day observation of SGR J1935+2154 I. Burst Catalog
- FRB 200428: an Impact between an Asteroid and a Magnetar
- Revisit the periodicity of SGR J1935+2154 bursts with updated sample
- Tidally-induced Magnetar Super Flare at the Eve of Coalescence with Its Compact Companion
- Detector performance of the Gamma-ray Transient Monitor onboard DRO-A Satellite
- Double-peaked Pulse Profile of FRB 200428: Synchrotron Maser Emission from Magnetized Shocks Encountering a Density Jump
- Search for Quasi-Periodical Oscillations in Precursors of Short and Long Gamma Ray Bursts
- Central Engine Memory of Gamma-Ray Bursts and Soft Gamma-Ray Repeaters
- GECAM Observations of the Galactic Magnetar SGR J1935+2154 during the 2021 and 2022 Burst Active Episodes. I. Burst Catalog