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Swift/BAT monitoring of Fermi/LAT sources
Hans A. Krimm, Scott D. Barthelmy, Neil Gehrels +9
The Swift Burst Alert Telescope (BAT) hard X-ray transient monitor tracks more than 700 galactic and extragalactic sources on time scales ranging from a single Swift pointing (appr…
GRB081028 and its late-time afterglow re-brightening
R. Margutti, F. Genet, J. Granot +19
Swift captured for the first time a smoothly rising X-ray re-brightening of clear non-flaring origin after the steep decay in a long gamma-ray burst (GRB): GRB081028. A rising phas…
GRB090111: extra soft steep decay emission and peculiar re-brightening
R. Margutti, T. Sakamoto, G. Chincarini +8
We present a detailed study of GRB090111, focusing on its extra soft power-law photon index Gamma>5 at the very steep decay phase emission (power-law index alpha=5.1, steeper than…
Testing the Epeak - Eiso relation for GRBs detected by Swift and Suzaku-WAM
H. A. Krimm, K. Yamaoka, S. Sugita +12
One of the most prominent, yet controversial associations derived from the ensemble of prompt-phase observations of gamma-ray bursts (GRBs) is the apparent correlation in the sourc…
Spectral Lags and the Lag-Luminosity Relation: An Investigation with Swift BAT Gamma-ray Bursts
T. N. Ukwatta, M. Stamatikos, K. S. Dhuga +7
Spectral lag, the time difference between the arrival of high-energy and low-energy photons, is a common feature in Gamma-ray Bursts (GRBs). Norris et al. 2000 reported a correlati…
Variability in the Prompt Emission of Swift-BAT Gamma-Ray Bursts
T. N. Ukwatta, K. S. Dhuga, W. C. Parke +8
We present the results of our study of the variability time scales of a sample of 27 long Swift Gamma-Ray Bursts (GRBs) with known redshifts. The variability time scale can help ou…
The Correlation of Spectral Lag Evolution with Prompt Optical Emission in GRB 080319B
Michael Stamatikos, Tilan N. Ukwatta, Takanori Sakamoto +8
We report on observations of correlated behavior between the prompt gamma-ray and optical emission from GRB 080319B, which confirm that (i) they occurred within the same astrophysi…
Indication of Two Classes in the Swift Short Gamma-Ray Bursts from the XRT X-Ray Afterglow Light Curves
T. Sakamoto, N. Gehrels
We present the discovery of two distinct classes in the Swift short duration gamma-ray bursts (S-GRBs) from the X-Ray Telescope (XRT) X-ray afterglow light curve. We find that abou…
Suzaku Observation of the New Soft Gamma Repeater SGR 0501+4516 in Outburst
T. Enoto, Y. E. Nakagawa, N. Rea +17
We present the first Suzaku observation of the new Soft Gamma Repeater SGR 0501+4516, performed on 2008 August 26, four days after the onset of bursting activity of this new member…
Investigating the Possibility of Screening High-z GRBs based on BAT Prompt Emission Properties
T. N. Ukwatta, T. Sakamoto, K. S. Dhuga +5
Being able to quickly select among gamma-ray bursts (GRBs) seen by the Swift satellite those which are high-z candidates would give ground-based observers a better chance to determ…