The peak flux of long gamma-ray bursts in the E$_{\rm p,i}$--L$_{\rm iso}$ diagram and in the classification

TL;DR

This study investigates how peak flux influences the observed E$_{ m p,i}$--L$_{ m iso}$ correlation in long gamma-ray bursts, revealing potential selection effects and alternative origins for some bursts.

Contribution

The paper demonstrates the significant impact of peak flux selection effects on the E$_{ m p,i}$--L$_{ m iso}$ correlation and suggests using combined criteria to identify different LGRB origins.

Findings

Peak flux significantly affects the observed LGRB correlation.

Simulated data reproduces observed distributions only with dependence on (E$_{ m p,i}$, L$_{ m iso}$).

Some low-E$_{ m p,i}$ & L$_{ m iso}$ GRBs with high peak flux may have different origins.

Abstract

The E$_{\rm p,i}$--L$_{\rm iso}$ correlation of long gamma-ray bursts (LGRBs) is regarded as a fundamental correlation for standardizing LGRBs to probe cosmology and constrain LGRB physics. However, this correlation may be affected by potential selection effects which are likely overlooked in the current small LGRB redshift sample. In this work, we simulate a large LGRB sample that reflects the observed situation, aiming to study the impact of peak flux $P$ on the observed LGRB E$_{\rm p,i}$--L$_{\rm iso}$ correlation. We find that the overall (E$_{\rm p,i}$, L$_{\rm iso}$) distribution, which will directly affect the best-fit result of the correlation, is significantly dependent on the value of $P$. This indicates that the impact of peak flux selection should be carefully considered in the studies and applications of the E$_{\rm p,i}$--L$_{\rm iso}$ correlation. Notably, we show that our simulated data can reproduce the observed $P$ distribution only if some dependence of (E$_{\rm p,i}$, L$_{\rm iso}$) is included in the simulation. This is an indication that the (E$_{\rm p,i}$, L$_{\rm iso}$) connection is a crucial property of LGRBs. We also find that GRBs with high peak flux in the low-E$_{\rm p,i}$ & L$_{\rm iso}$ region are not the straightforward extrapolation of the GRB population in the higher-E$_{\rm p,i}$ & L$_{\rm iso}$ region. Selecting four bursts with $ L_{\rm iso}\le10^{50}$ erg s$^{-1}$, $E_{\rm p, i}\le10^{2.5}$ keV, and $P\ge10^{0.5}$ ph cm$^{-2}$ s$^{-1}$, we find two bursts, GRB 060614 and GRB 191019A, which may not be associated with the theoretical massive-star origin of LGRBs. This suggests that combining $P$ with the position in the E$_{\rm p,i}$--L$_{\rm iso}$ diagram may be used to indicate alternative LGRB origins.