2025NatAs...9.1375L

Query : 2025NatAs...9.1375L

2025NatAs...9.1375L - Nature Astronomy, 9, 1375-1386 (2025/September-0)

Fast X-ray transient EP240315A from a Lyman-continuum-leaking galaxy at z ≈ 5.

LEVAN A.J., JONKER P.G., SACCARDI A., MALESANI D.B., TANVIR N.R., IZZO L., HEINTZ K.E., MATA SANCHEZ D., QUIROLA-VASQUEZ J., TORRES M.A.P., VERGANI S.D., SCHULZE S., ROSSI A., D'AVANZO P., GOMPERTZ B.P., MARTIN-CARRILLO A., DE UGARTE POSTIGO A., SCHNEIDER B., YUAN W., LING Z., ZHANG W., MAO X., LIU Y., SUN H., XU D., ZHU Z., AGUI FERNANDEZ J.F., AMATI L., BAUER F.E., CAMPANA S., CAROTENUTO F., CHRIMES A., VAN DALEN J.N.D., D'ELIA V., DELLA VALLE M., DE PASQUALE M., DHILLON V.S., GALBANY L., GASPARI N., GIANFAGNA G., GOMBOC A., HABEEB N., HARTMANN D., VAN HOOF A.P.C., HU Y., JAKOBSSON P., JULAKANTI Y., KORTH J., KOUVELIOTOU C., LASKAR T., LITTLEFAIR S.P., MAIORANO E., MAO J., MELANDRI A., MILLER M.C., MUKHERJEE T., OATES S.R., O'BRIEN P., PALMERIO J.T., PARVIAINEN H., PIETERSE D.L.A., PIRANOMONTE S., PIRO L., PUGLIESE G., RAVASIO M.E., RAYSON B., SALVATERRA R., SANCHEZ-RAMIREZ R., SARIN N., SHILLING S.P.R., STARLING R.L.C., TAGLIAFERRI G., THAKUR A.L., THONE C.C., WIERSEMA K., WORSSAM I. and ZAFAR T.

Abstract (from CDS):

The nature of the minute-to-hour-long fast X-ray transients localized by telescopes such as Chandra, Swift and XMM-Newton remains mysterious, with numerous models suggested for the events. Here we report multi-wavelength observations of EP240315a, a 1,600-s-long transient detected by the Einstein Probe, showing it to have a redshift of z = 4.859. We measure a low column density of neutral hydrogen and directly detect leaking ionizing Lyman continuum. The observed properties are consistent with EP240315a being a long-duration gamma-ray burst, and these observations suggest a possible interpretation in which a substantial fraction of the X-ray-transient population are lower-luminosity examples of similar events. If correct, then sensitive narrow-field searches could be a powerful complementary probe to traditional wide-field transient detection in the identification of samples of gamma-ray-burst-like events into the epoch of reionization.

Abstract Copyright: 2025 The Author(s), under exclusive licence to Springer Nature Limited

Journal keyword(s):

Simbad objects: 16

Full paper

View the references in ADS

Number of rows : 16

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Sp type	#ref 1850 - 2026	#notes
1	GRB 100905A	gB	02 06 12.06	+14 55 45.9					~	45	0
2	SN 2006aj	SN*	03 21 39.670	+16 52 02.27	17.96	19.11	17.40		SNIc-BL	1007	1
3	GRB 230307A	gB	04 03 26.24	-75 22 43.8					~	221	0
4	HD 289002	*	06 45 13.3725491952	+02 08 14.685250596	10.06	10.62	10.44		B1	277	0
5	EP 240315a	ev	09 26 35	-09 32.8					~	59	0
6	AT 2024eju	ev	09 26 35.432	-09 32 02.74					~	9	0
7	Fermi bn090423330	gB	09 55 33.19	+18 08 57.7					~	392	0
8	GRB 240315C	gB	10 37 22.0	+10 50 04					~	21	0
9	GRB 011121	gB	11 34 26.67	-76 01 41.6				23.0	~	286	1
10	AT 2022cmc	ev	13 34 43.207	+33 13 00.54					~	79	0
11	GRB 090429B	gB	14 02 40.10	+32 10 14.6					~	166	0
12	SDSS J140910.47+275320.8	G	14 09 10.47535	+27 53 20.8393					~	279	0
13	SWIFT J164449.3+573451	G	16 44 47.81184000	+57 35 00.7113480					~	533	0
14	GRB 020903	gB	22 48 42.34	-20 46 09.3					~	248	1
15	GRB 980519	gB	23 22 21.5	+77 15 43					~	203	0
16	GRB 981226	gB	23 29 37.2	-23 55 54					~	108	1

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