2025MNRAS.544.3683W

Query : 2025MNRAS.544.3683W

2025MNRAS.544.3683W - Mon. Not. R. Astron. Soc., 544, 3683-3695 (2025/December-3)

Photospheric emission from GRB 211211A altered by a strong radiation-mediated shock.

WISTEMAR O., ALAMAA F. and RYDE F.

Abstract (from CDS):

Gamma-ray burst (GRB) spectra are typically non-thermal, with many including two spectral breaks suggestive of optically thin emission. However, the emitted spectrum from a GRB photosphere, which includes prior dissipation of energy by radiation-mediated shocks (RMSs), can also produce such spectral features. Here, we analyse the bright GRB 211211A using the Kompaneets RMS Approximation (KRA). We find that the KRA can fit the time-resolved spectra well, significantly better than the traditionally used Band function in all studied time bins. The analysis of GRB 211211A reveals a jet with a typical Lorentz factor ( $\Gamma \sim 300$ ), and a strong RMS (upstream dimension-less specific momentum, $\gamma _u \beta _u \sim 3$ ) occurring at a moderate optical depth ( $\tau \sim 35$ ) in a relatively cold upstream ( $\theta _u = k_{\rm B} T_u / m_e c^2 \sim 10^{-4}$ ). We conclude that broad GRB spectra that exhibit two breaks can also be well explained by photospheric emission. This implies that, in such cases, the spectral shape in the MeV-band alone is not enough to determine the emission mechanism during the prompt phase in GRBs.

Abstract Copyright: © The Author(s) 2025. Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): gamma-ray bursts - radiation mechanisms: general - gamma-ray burst: individual: GRB 211211A

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	SDSS J140910.47+275320.8	G	14 09 10.47535	+27 53 20.8393						~	279	0

Query : 2025MNRAS.544.3683W

Basic data :

SDSS J140910.47+275320.8 -- Galaxy

G (2020ApJS,[FND2022]), gB (Fermi,GRB), Opt (SDSS)

14 09 10.47535 +27 53 20.8393 (Optical) [ ] C 2020ApJS..249....3A

14 06 55.54549 +28 07 30.5157 [ ]

039.95752785 +72.76425325 [ ]

V(km/s) 22004 [60] / z(spectroscopic) 0.076300 [0.000200] / cz 22874.16 [59.96] (Opt) C 2022ApJ...940...56F

u (AB) 20.993 [0.130] D 2020ApJS..249....3A

g (AB) 19.990 [0.024] C 2020ApJS..249....3A

r (AB) 19.531 [0.023] C 2020ApJS..249....3A

i (AB) 19.216 [0.030] C 2020ApJS..249....3A

z (AB) 19.099 [0.097] C 2020ApJS..249....3A

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SDSS J140910.47+275320.8 Fermi bn211211549 GRB 211211A [FND2022] GRB 211211A Host G

References (279 between 1850 and 2026) (Total 279)
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