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2025ApJ...995....8L - Astrophys. J., 995, 8 (2025/December-2)

Multiwavelength Observations of the Apparently Nonrepeating FRB 20250316A.

LI Y., SUN H., QIAN L., LI D.-Y., HUA Y.-L., XIN L.-P., LI C.-K., WANG Y.-H., NIU J.-R., SUN T.-R., YAO Z.-H., GENG J.-J., JIN C.-C., REA N., LIU Y., PAN Z.-C., AN T., BURWITZ V., CAI Z.-M., CAO J.-H., CHEN Y., CHENG H.-Q., CUI W.-W., FENG H., FRIEDRICH P., HAN D.-W., HU J.-W., HU L., HUANG Y.-X., JIA S.-M., JIANG J.-A., LI B., LI F., LIANG M., LIANG Y.-F., LIU H., LIU H.-Y., LIU H.-Q., MEIDINGER N., PAN H.-W., RAU A., SHU X.-W., SUN C., TAO L., TANG J.-L., WAN Z., WANG H.-R., WANG J., WANG J., XU Y.-F., XUE Y., YANG X., YAO D.-Z., YAO Y., ZHAO W., ZHAO X.-F., ZHANG H.-F., ZHANG J.-H., ZHANG J., ZHANG M., ZHANG S.-B., ZHANG W.-D., ZHANG X.-L., ZHANG Y.-H., ZHANG Y.-K., ZHENG X.-Z., ZHU Y.-H., ZUO Y.-X., SUN S.-L., WEI J.-Y., ZHU W.-W., JIANG P., YUAN W., WU X.-F. and ZHANG B.

Abstract (from CDS):

The physical origin of fast radio bursts (FRBs) remains uncertain. Although multiwavelength observations have been widely conducted, only Galactic FRB 20200428D is associated with an X-ray burst from the magnetar SGR J1935+2154. Here we present multiwavelength follow-up observations of the nearby bright FRB 20250316A, including the Five-hundred-meter Aperture Spherical radio Telescope (FAST), Einstein Probe (EP) X-ray mission, Chandra X-ray Observatory, Wide Field Survey Telescope (WFST), and Space Variable Objects Monitor/Visible Telescope (SVOM/VT). The 13.08 hr FAST follow-up campaign without pulse detection requires an energy distribution flatter than those of well-known repeating FRBs, suggesting that this burst is likely a one-off event. A prompt EP follow-up and multiepoch observational campaign totaling >100 ks led to the detection of an X-ray source within the angular resolution of its Follow-up X-ray Telescope (FXT; 10″). A subsequent Chandra observation revealed this source to be offset by 7″ from the FRB position and established a 0.5-10 keV flux upper limit of 7.6 × 10–15 erg cm–2 s–1 at the FRB position, corresponding to ∼1039 erg s–1 at the 40 Mpc distance of the host galaxy NGC 4141. These results set one of the most stringent limits on X-ray emission from a nonrepeating FRB, disfavoring ultraluminous X-ray sources as counterparts of apparently one-off FRBs and offering critical insights into afterglow models. Our study suggests that an arcsecond localization of both the FRB and its potential X-ray counterpart is essential for exploring the X-ray counterpart of an FRB.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Radio transient sources - Radio bursts - Transient sources

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

Simbad objects: 18

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