Results 1 to 10 of about 34,279 (294)

GRB Flares: UV/Optical Flaring (Paper I) [PDF]

The Astrophysical Journal, 2013
We present a new algorithm for the detection of flares in gamma-ray burst (GRB) light curves and use this algorithm to detect flares in the UV/optical.
De Pasquale, M., Oates, S. R., Roming, P. W. A., Swenson, C. A.   +3 more
core   +4 more sources

Minutes-duration optical flares with supernova luminosities

Nature, 2023
In recent years, certain luminous extragalactic optical transients have been observed to last only a few days. Their short observed duration implies a different powering mechanism from the most common luminous extragalactic transients (supernovae) whose timescale is weeks.
Ho, A.Y.Q., Perley, D.A., Chen, P., Schulze, S., Dhillon, V., Kumar, H., Suresh, A., Swain, V., Bremer, M., Smartt, S.J., Anderson, J.P., Anupama, G.C., Awiphan, S., Barway, S., Bellm, E.C., Ben-Ami, S., Bhalerao, V., de Boer, T., Brink, T.G., Burruss, R., Chandra, P., Chen, T.-W., Chen, W.-P., Cooke, J., Coughlin, M.W., Das, K.K., Drake, A.J., Filippenko, A.V., Freeburn, J., Fremling, C., Fulton, M.D., Gal-Yam, A., Galbany, L., Gao, H., Graham, M.J., Gromadzki, M., Gutiérrez, C.P., Hinds, K.-R., Inserra, C., A J, N., Karambelkar, V., Kasliwal, M.M., Kulkarni, S., Müller-Bravo, T.E., Magnier, E.A., Mahabal, A.A., Moore, T., Ngeow, C.-C., Nicholl, M., Ofek, E.O., Omand, C.M.B., Onori, F., Pan, Y.-C., Pessi, P.J., Petitpas, G., Polishook, D., Poshyachinda, S., Pursiainen, M., Riddle, R., Rodriguez, A.C., Rusholme, B., Segre, E., Sharma, Y., Smith, K.W., Sollerman, J., Srivastav, S., Strotjohann, N.L., Suhr, M., Svinkin, D., Wang, Y., Wiseman, P., Wold, A., Yang, S., Yang, Y., Yao, Y., Young, D.R., Zheng, W.   +76 more
openaire   +10 more sources

Optical Discovery of Probable Stellar Tidal Disruption Flares [PDF]

The Astrophysical Journal, 2011
Using archival Sloan Digital Sky Survey (SDSS) multi-epoch imaging data (Stripe 82), we have searched for the tidal disruption of stars by supermassive black holes in non-active galaxies. Two candidate tidal disruption events (TDEs) are identified.
Drake, Andrew J., Farrar, Glennys R., Gelfand, Joseph, Gezari, Suvi, Morrell, Nidia, Smith, Mathew, van Velzen, Sjoert, Zaritsky, Dennis, Östman, Linda   +8 more
core   +8 more sources

Radio and Optical Flares on the dMe Flare Star EV Lac

The Astrophysical Journal
We present the results of a coordinated campaign to observe radio and optical stellar flares from the nearby M dwarf flare star EV Lac. From a total of 27 hr of radio and 29 hr of optical observations, we examine the correspondence of the action of ...
Rachel A. Osten, Adam F. Kowalski, Suzanne Hawley, Isaiah I. Tristan, Sarah J. Schmidt, Ben Tofflemire, Eric Hilton   +6 more
doaj   +3 more sources

Magnetic Field Amplification and Blazar Flares

EPJ Web of Conferences, 2013
Recent multiwavelength observations of PKS 0208-512 by SMARTS, Fermi, and Swift revealed that γ-ray and optical light curves of this flat spectrum radio quasars are highly correlated, but with an exception of one large optical flare having no ...
Chen Xuhui, Chatterjee Ritaban, Fossati Giovanni, Pohl Martin   +3 more
doaj   +2 more sources

A circular white-light flare with impulsive and gradual white-light kernels

Nature Communications, 2017
White-light flares are rare solar events entailing emission in the optical continuum. Here, the authors report a nearly circular white-light flare observed on March 10th 2015 that contains simultaneously both impulsive and gradual white-light kernels.
Q. Hao, K. Yang, X. Cheng, Y. Guo, C. Fang, M. D. Ding, P. F. Chen, Z. Li   +7 more
doaj   +3 more sources

Constraints on Stellar Flare Energy Ratios in the NUV and Optical from a Multiwavelength Study of GALEX and Kepler Flare Stars

The Astrophysical Journal, 2023
We present a multiwavelength study of stellar flares on primarily G-type stars using overlapping time domain surveys in the near-ultraviolet (NUV) and optical regimes. The NUV (the Galaxy Evolution Explorer; GALEX) and optical (Kepler) wavelength domains
C. E. Brasseur, Rachel A. Osten, Isaiah I. Tristan, Adam F. Kowalski   +3 more
doaj   +1 more source

LOW-POWER SOLAR FLARES OF OPTICAL AND X-RAY WAVELENGTHS FOR SOLAR CYCLES 21–24

Solar-Terrestrial Physics, 2020
Using data obtained in optical and X-ray wavelengths, we have analyzed solar flare activity for cycles 21–24. Over the last three cycles, solar activity is shown to decrease significantly.
A.V. Borovik , A.A. Zhdanov
doaj   +1 more source

Chandra, HST/STIS, NICER, Swift, and TESS Detail the Flare Evolution of the Repeating Nuclear Transient ASASSN -14ko

The Astrophysical Journal, 2023
ASASSN-14ko is a nuclear transient at the center of the AGN ESO 253−G003 that undergoes periodic flares. Optical flares were first observed in 2014 by the All-Sky Automated Survey for Supernovae (ASAS-SN) and their peak times are well-modeled with a ...
Anna V. Payne, Katie Auchettl, Benjamin J. Shappee, Christopher S. Kochanek, Patricia T. Boyd, Thomas W.-S. Holoien, Michael M. Fausnaugh, Chris Ashall, Jason T. Hinkle, Patrick J. Vallely, K. Z. Stanek, Todd A. Thompson   +11 more
doaj   +1 more source

Dynamics of small-scale magnetic fields before small and large solar flares

Solar-Terrestrial Physics, 2023
We have examined the dynamics of the longitudinal magnetic field of active region NOAA 12673, using data from the Solar Dynamics Observatory (SDO). During the passage of the active region (AR) across the solar disk, its spots and background fields showed
Borovik A. V., Zhdanov A. A.
doaj   +1 more source