Zobrazeno 1 - 10
of 88
pro vyhledávání: '"Williams, G. G."'
Autor:
Bostroem, K. A., Valenti, S., Sand, D. J., Andrews, J. E., Van Dyk, S. D., Galbany, L., Pooley, D., Amaro, R. C., Smith, N., Yang, S., Anupama, G. C., Arcavi, I., Baron, E., Brown, P. J., Burke, J., Cartier, R., Hiramatsu, D., Dong, Y., Egami, E., Ertel, S., Filippenko, A. V., Fox, O. D., Haislip, J., Hosseinzadeh, G., Howell, D. A., Gangopadhyay, A., Jha, S. W., Kouprianov, V., Kumar, B., Lundquist, M., Milisavljevic, D., McCully, C., Milne, P., Misra, K., Reichart, D. E., Sahu, D. K., Sai, H., Singh, A., Smith, P. S., Vinko, J., Wang, X., Wang, Y., Wheeler, J. C., Williams, G. G., Wyatt, S., Zhang, J., Zhang, X.
Publikováno v:
The Astrophysical Journal, 2020, Volume 895, Number 1
We present the discovery and high-cadence follow-up observations of SN 2018ivc, an unusual Type II supernova that exploded in NGC 1068 (D=10.1 Mpc). The light curve of SN 2018ivc declines piecewise-linearly, changing slope frequently, with four clear
Externí odkaz:
http://arxiv.org/abs/1909.07304
Autor:
Lundquist, M. J., Paterson, K., Fong, W., Sand, D. J., Andrews, J. E., Shivaei, I., Daly, P. N., Valenti, S., Yang, S., Christensen, E., Gibbs, A. R., Shelly, F., Wyatt, S., Kuhn, O., Amaro, R. C., Arcavi, I., Behroozi, P., Butler, N., Chomiuk, L., Corsi, A., Drout, M. R., Egami, E., Fan, X., Foley, R. J., Frye, B., Gabor, P., Green, E. M., Grier, C. J., Guzman, F., Hamden, E., Howell, D. A., Jannuzi, B. T., Kelly, P., Milne, P., Moe, M., Nugent, A., Olszewski, E., Palazzi, E., Paschalidis, V., Psaltis, D., Reichart, D., Rest, A., Rossi, A., Schroeder, G., Smith, P. S., Smith, N., Spekkens, K., Strader, J., Stark, D. P., Trilling, D., Veillet, C., Wagner, M., Weiner, B., Wheeler, J. C., Williams, G. G., Zabludoff, A.
We present Searches After Gravitational-waves Using ARizona Observatories (SAGUARO), a comprehensive effort dedicated to the discovery and characterization of optical counterparts to gravitational wave (GW) events. SAGUARO utilizes ground-based facil
Externí odkaz:
http://arxiv.org/abs/1906.06345
Autor:
Henze, M., Pietsch, W., Haberl, F., Della Valle, M., Riffeser, A., Sala, G., Hatzidimitriou, D., Hofmann, F., Hartmann, D. H., Koppenhoefer, J., Seitz, S., Williams, G. G., Hornoch, K., Itagaki, K., Kabashima, F., Nishiyama, K., Xing, G., Lee, C. H., Magnier, E., Chambers, K.
[Abridged] Classical novae (CNe) represent the main class of supersoft X-ray sources (SSSs) in the central region of our neighbouring galaxy M 31. Only three confirmed novae and three SSSs have been discovered in globular clusters (GCs) of any galaxy
Externí odkaz:
http://arxiv.org/abs/1211.4736
Autor:
Perley, Daniel A., Morgan, A. N., Updike, A., Yuan, F., Akerlof, C. W., Miller, A. A., Bloom, J. S., Cenko, S. B., Li, W., Filippenko, A. V., Prochaska, J. X., Kann, D. A., Butler, N. R., Christian, P., Hartmann, D. H., Milne, P., Rykoff, E. S., Rujopakarn, W., Wheeler, J. C., Williams, G. G.
We present early-time optical through infrared photometry of the bright gamma-ray burst GRB 080607, starting only 6 s following the initial trigger in the rest frame. Complemented by our previously published spectroscopy, this high-quality photometri
Externí odkaz:
http://arxiv.org/abs/1009.0004
Autor:
Perley, Daniel A., Bloom, J. S., Klein, C. R., Covino, S., Minezaki, T., Wozniak, P., Vestrand, W. T., Williams, G. G., Milne, P., Butler, N. R., Updike, A. C., Krühler, T., Afonso, P., Antonelli, A., Cowie, L., Ferrero, P., Greiner, J., Hartmann, D. H., Kakazu, Y., Yoldas, A. Küpcü, Morgan, A. N., Price, P. A., Prochaska, J. X., Yoshii, Y.
We present observations and analysis of the broadband afterglow of Swift GRB 071025. Using optical and infrared (RIYJHK) photometry, we derive a photometric redshift of 4.4 < z < 5.2; at this redshift our simultaneous multicolour observations begin a
Externí odkaz:
http://arxiv.org/abs/0912.2999
Autor:
D'Arcangelo, F. D., Marscher, A. P., Jorstad, S. G., Smith, P. S., Larionov, V. M., Hagen-Thorn, V. A., Williams, G. G., Gear, W. K., Clemens, D. P., Sarcia, D., Grabau, A., Tollestrup, E. V., Buie, M. W., Taylor, B., Dunham, E.
Publikováno v:
Astrophys.J.697:985-995,2009
We explore the variability and cross-frequency correlation of the flux density and polarization of the blazar OJ287, using imaging at 43 GHz with the Very Long Baseline Array, as well as optical and near-infrared polarimetry. The polarization and flu
Externí odkaz:
http://arxiv.org/abs/0903.3934
Autor:
Henze, M., Pietsch, W., Sala, G., Della Valle, M., Hernanz, M., Greiner, J., Burwitz, V., Freyberg, M. J., Haberl, F., Hartmann, D. H., Milne, P., Williams, G. G.
Short supersoft X-ray source (SSS) states (durations < 100 days) of classical novae (CNe) indicate massive white dwarfs that are candidate progenitors of supernovae type Ia. We carry out a dedicated optical and X-ray monitoring program of CNe in the
Externí odkaz:
http://arxiv.org/abs/0812.4420
Autor:
Henze, M., Pietsch, W., Haberl, F., Sala, G., Quimby, R., Hernanz, M., Della Valle, M., Milne, P., Williams, G. G., Burwitz, V., Greiner, J., Stiele, H., Hartmann, D. H., Kong, A. K. H., Hornoch, K.
Classical novae (CNe) have been found to represent the major class of supersoft X-ray sources (SSS) in our neighbour galaxy M 31. We determine properties and evolution of the two first SSSs ever discovered in the M 31 globular cluster (GC) system. We
Externí odkaz:
http://arxiv.org/abs/0811.0718
Autor:
Modjaz, Maryam, Li, W., Butler, N., Chornock, R., Perley, D., Blondin, S., Bloom, J. S., Filippenko, A. V., Kirshner, R. P., Kocevski, D., Poznanski, D., Hicken, M., Foley, R. J., Stringfellow, G. S., Berlind, P., Navascues, D. Barrado y, Blake, C. H., Bouy, H., Brown, W. R., Challis, P., Chen, H., de Vries, W. H., Dufour, P., Falco, E., Friedman, A., Ganeshalingam, M., Garnavich, P., Holden, B., Illingworth, G., Liebert, J., Marion, G. H., Lee, N., Olivier, S. S., Prochaska, J. X., Silverman, J. M., Smith, N., Starr, D., Steele, T. N., Stockton, A., Williams, G. G., Wood-Vasey, W. M.
Publikováno v:
Astrophys.J.702:226-248,2009
We present extensive early photometric (ultraviolet through near-infrared) and spectroscopic (optical and near-infrared) data on supernova (SN) 2008D as well as X-ray data analysis on the associated Swift/X-ray transient (XRT) 080109. Our data span a
Externí odkaz:
http://arxiv.org/abs/0805.2201
Autor:
Williams, G. G., Milne, P. A., Park, H. S., Barthelmy, S. D., Hartmann, D. H., Updike, A., Hurley, K.
Publikováno v:
AIP Conf.Proc.1000:535-538,2008
We provide an overview of the robotic Super-LOTIS (Livermore Optical Transient Imaging System) telescope and present results from gamma-ray burst (GRB) afterglow observations using Super-LOTIS and other Steward Observatory telescopes. The 0.6-m Super
Externí odkaz:
http://arxiv.org/abs/0803.0021