The progenitor mass of the magnetar SGR1900+14 (2009)
Davies, Ben, Figer, Don F., Kudritzki, Rolf-Peter, Trombley, Christine, Kouveliotou, Chryssa, Wachter, Stefanie
Magnetars are young neutron stars with extreme magnetic fields (B > 10^{14}-10^{15}G). How these fields relate to the properties of their progenitor stars is not yet clearly established. However,...
The Fermi Gamma-Ray Burst Monitor (2009)
Meegan, Charles, Lichti, Giselher, Bhat, P. N., Bissaldi, Elisabetta, Briggs, Michael S., Connaughton, Valerie, ...
The Gamma-Ray Burst Monitor (GBM) will significantly augment the science return from the Fermi Observatory in the study of Gamma-Ray Bursts (GRBs). The primary objective of GBM is to extend the...
The Dynamic X-ray Sky of the Local Universe (2009)
Soderberg, Alicia M., Grindlay, Jonathan E., Bloom, Joshua S., Gezari, Suvi, Piro, Anthony L., Belloni, Tomaso, ...
Over the next decade, we can expect time domain astronomy to flourish at optical and radio wavelengths. In parallel with these efforts, a dedicated transient "machine" operating at higher energies...
In Situ Probes of the First Galaxies and Reionization: Gamma-ray Bursts (2009)
McQuinn, Matthew, Bloom, Joshua S., Grindlay, Jonathan, Band, David, Barthelmy, S. D., Berger, E., ...
The first structures in the Universe formed at z>7, at higher redshift than all currently known galaxies. Since GRBs are brighter than other cosmological sources at high redshift and exhibit simple...
On-orbit performance of the Fermi gamma-ray burst monitor (2009)
Meegan, Charles, Bhat, P. N., Bissaldi, Elisabetta, Briggs, Michael, Connaughton, Valerie, Diehl, Roland, ...
The Fermi gamma-ray burst monitor (2009)
Meegan, Charles, Lichti, Giselher, Bhat, P. N., Bissaldi, Elisabetta, Briggs, Michael S., Connaughton, Valerie, ...
Ground-based calibration and characterization of the Fermi Gamma-Ray Burst Monitor Detectors (2008)
Bissaldi, Elisabetta, Von Kienlin, Andreas, Lichti, Giselher G., Steinle, Helmut, Bhat, P. Narayana, Briggs, Michael S., ...
One of the scientific objectives of NASA's Fermi Gamma-ray Space Telescope is the study of Gamma-Ray Bursts (GRBs). The Fermi Gamma-Ray Burst Monitor (GBM) was designed to detect and localize bursts...
Late time observations of GRB080319B: jet break, host galaxy and accompanying supernova (2008)
Tanvir, Nial R., Rol, Evert, Levan, Andrew, Fruchter, Andrew, Granot, Jonathan, Svensson, Karl M., ...
The Swift-discovered GRB080319B was by far the most distant source ever observed at naked eye brightness, reaching a peak magnitude of 5.3 at a redshift of z=0.937. We present our late time optical...
GLAST burst monitor instrument simulation and modeling (2008)
Meegan, Charles, Bhat, Narayana, Bissaldi, Elisabetta, Briggs, Michael, Connaughton, Valerie, Diehl, Roland, ...
GRB051022: physical parameters and extinction of a prototype dark burst (2007)
Rol, Evert, Van Der Horst, Alexander, Wiersema, Klaas, Patel, Sandeep K., Levan, Andrew, Nysewander, Melissa, ...
GRB051022 was undetected to deep limits in early optical observations, but precise astrometry from radio and X-ray showed that it most likely originated in a galaxy at z~0.8. We report radio,...
The Magnetar Nature and the Outburst Mechanism of a Transient Anomalous X-ray Pulsar (2007)
Guver, Tolga, Ozel, Feryal, Gogus, Ersin, Kouveliotou, Chryssa
Anomalous X-ray Pulsars (AXPs) belong to a class of neutron stars believed to harbor the strongest magnetic fields in the universe, as indicated by their energetic bursts and their rapid spindowns....
Calibration of the GLAST Burst Monitor detectors (2007)
Von Kienlin, Andreas, Bissaldi, Elisabetta, Lichti, Giselher G., Steinle, Helmut, Krumrey, Michael, Gerlach, Martin, ...
The GLAST Burst Monitor (GBM) will augment the capabilities of GLAST for the detection of cosmic gamma-ray bursts by extending the energy range (20 MeV to > 300 GeV) of the Large Area Telescope (LAT)...
The GLAST burst monitor (2007)
Meegan, Charles, Bhat, Narayana, Connaughton, Valerie, Briggs, Michael, Diehl, Roland, Fishman, Gerald, ...
GLAST burst monitor signal processing system (2007)
Bhat, P. Narayana, Briggs, Michael, Connaughton, Valerie, Diehl, Roland, Fishman, Gerald, Greiner, Jochen, ...
Steinle, Helmut, Von Kienlin, Andreas, Bissaldi, Elisabetta, Lichti, Giselher, Diehl, Roland, Greiner, Jochen, ...
Calibration of the GLAST burst monitor detectors (2007)
Von Kienlin, Andreas, Bissaldi, Elisabetta, Lichti, Giselher G., Steinle, Helmut, Krumrey, Michael, Gerlach, Martin, ...
Long Term Cooling of Magnetar Crusts (2006)
Eichler, David, Lyubarsky, Yuri, Kouveliotou, Chryssa, Wilson, Colleen A.
X-ray emission following giant flares of magnetars can be categorized into three categories of time scales (a) short term afterglow (b) medium term afterglow and (c) long term afterglow. Short term...
A Chandra Search for Coronal X Rays from the Cool White Dwarf GD 356 (2006)
Weisskopf, Martin C., Wu, Kinwah, Trimble, Virginia, O'Dell, Stephen L., Elsner, Ronald F., Zavlin, Vyacheslav E., ...
We report observations with the Chandra X-ray Observatory of the single, cool, magnetic white dwarf GD 356. For consistent comparison with other X-ray observations of single white dwarfs, we also...
Levan, Andrew, Fruchter, Andrew, Rhoads, James, Mobasher, Bahram, Tanvir, Nial, Gorosabel, Javier, ...
We present near-infrared (nIR) and optical observations of the afterglow of GRB 030115. Discovered in an infrared search at Kitt Peak 5 hours after the burst trigger, this afterglow is amongst the...
Jet Breaks in Short Gamma-Ray Bursts. II: The Collimated Afterglow of GRB 051221A (2006)
Burrows, David N., Grupe, Dirk, Capalbi, Milvia, Panaitescu, Alin, Patel, Sandeep K., Kouveliotou, Chryssa, ...
We report the best evidence to date of a jet break in a short Gamma-Ray Burst (GRB) afterglow, using Chandra and Swift XRT observations of the X-ray afterglow of GRB 051221A. The combined X-ray light...
Woods, Peter M., Kouveliotou, Chryssa, Finger, Mark H., Gogus, Ersin, Wilson, Colleen A., Patel, Sandeep K., ...
On 2004 December 27, a highly-energetic giant flare was recorded from the magnetar candidate SGR 1806-20. In the months preceding this flare, the persistent X-ray emission from this object began to...
The optical afterglow of the short gamma-ray burst GRB 050709 (2005)
Hjorth, Jens, Watson, Darach, Fynbo, Johan P. U., Price, Paul A., Jensen, Brian L., Jørgensen, Uffe G., ...
It has long been known that there are two classes of gamma-ray bursts (GRBs), mainly distinguished by their durations. The breakthrough in our understanding of long-duration GRBs (those lasting more...
An Off-Axis Model for GRB 031203 (2004)
Ramirez-Ruiz, Enrico, Granot, Jonathan, Kouveliotou, Chryssa, Woosley, S. E., Patel, Sandy K., Mazzali, Paolo A.
The low luminosity radio emission of the unusually faint GRB 031203 has been argued to support the idea of a class of intrinsically sub-energetic gamma-ray bursts (GRBs), currently comprising two...
Levan, Andrew, Patel, Sandeep, Kouveliotou, Chryssa, Fruchter, Andrew, Rhoads, James, Rol, Evert, ...
X-ray Flashes (XRFs) are, like Gamma-Ray Bursts (GRBs), thought to signal the collapse of massive stars in distant galaxies. Many models posit that the isotropic equivalent energies of XRFs are lower...
The GLAST Burst Monitor (2004)
Von Kienlin, Andreas, Meegan, Charles A., Lichti, Giselher G., Bhat, Narayana P., Briggs, Michael S., Connaughton, Valerie, ...
The next large NASA mission in the field of gamma-ray astronomy, GLAST, is scheduled for launch in 2007. Aside from the main instrument LAT (Large-Area Telescope), a gamma-ray telescope for the...
Long Term Spectral and Timing Behavior of the Black Hole Candidate XTE J1908+094 (2004)
Gogus, Ersin, Finger, Mark H., Kouveliotou, Chryssa, Woods, Peter M., Patel, Sandeep K., Rupen, Michael, ...
We present the long term X-ray light curves, detailed spectral and timing analyses of XTE J1908+094 using the Rossi X-ray Timing Explorer Proportional Counter Array observations covering two...
GRB 020410: A Gamma-ray burst afterglow discovered by its supernova light (2004)
Levan, Andrew, Nugent, Peter, Fruchter, Andrew, Burud, Ingunn, Branch, David, Rhoads, James, ...
We present the discovery and monitoring of the optical transient (OT) associated with GRB 020410. The fading OT was found by Hubble Space Telescope (HST) observations taken 28 and 65 days after burst...
The GLAST burst monitor (2004)
Kienlin, Andreas Von, Meegan, Charles A., Lichti, Giselher G., Bhat, Narayana P., Briggs, Michael S., Connaughton, Valerie, ...
Wachter, Stefanie, Patel, Sandeep K., Kouveliotou, Chryssa, Bouchet, Patrice, Özel, Feryal, Tennant, Allyn F., ...
Chandra Observations of the Faintest Low-Mass X-ray Binaries (2003)
Wilson, Colleen. A., Patel, Sandeep K., Kouveliotou, Chryssa, Jonker, Peter G., Van Der Klis, Michiel, Lewin, Walter H. G, ...
There exists a group of persistently faint galactic X-ray sources that, based on their location in the galaxy, high L_x/L_opt, association with X-ray bursts, and absence of low frequency X-ray...
A very energetic supernova associated with the gamma-ray burst of 29 March 2003 (2003)
Hjorth, Jens, Sollerman, Jesper, Møller, Palle, Fynbo, Johan P. U., Woosley, Stan E., Kouveliotou, Chryssa, ...
Over the past five years evidence has mounted that long-duration (> 2 s) gamma-ray bursts (GRBs)--the most brilliant of all astronomical explosions--signal the collapse of massive stars in our...
GBM - a gamma-ray burst monitor for GLAST (2003)
Lichti, Giselher, Briggs, Michael, Diehl, Roland, Fishman, Gerald, Kippen, Marc, Kouveliotou, Chryssa, ...
Evolution of the polarization of the optical afterglow of the y-ray burst GRB030329 (2003)
Greiner, Jochen, Klose, Sylvio, Reinsch, Klaus, Schmid, Hans Martin, Sari, Re'em, Hartmann, Dieter H., ...
A very energetic supernova associated with the γ-ray burst of 29 March 2003 (2003)
Hjorth, Jens, Sollerman, Jesper, Møller, Palle, Fynbo, Johan P. U., Woosley, Stan E., Kouveliotou, Chryssa, ...
Chandra Observations of the Anomalous X-ray Pulsar 4U 0142+61 (2002)
Patel, Sandeep K., Kouveliotou, Chryssa, Woods, Peter M., Tennant, Allyn F., Weisskopf, Martin C., Finger, Mark H., ...
We present X-ray imaging, timing, and phase resolved spectroscopy of the anomalous X-ray pulsar 4U 0142+61 using the Chandra X-ray Observatory. The spectrum is well described by a power law plus...
Gogus, Ersin, Kouveliotou, Chryssa, Woods, Peter M., Finger, Mark H., Van Der Klis, Michiel
Soft Gamma Repeaters undergo pulse profile changes in connection with their burst activity. Here we present a comprehensive pulse profile history of SGR 1806-20 and SGR 1900+14 in three energy bands...
Serendipitous Detections of XTE J1906+09 with the Rossi X-ray Timing Explorer (2001)
Wilson, Colleen A., Finger, Mark H., Gogus, Ersin, Woods, Peter M., Kouveliotou, Chryssa
In 1996 during Rossi X-ray Timing Explorer (RXTE) observations of SGR 1900+14, the 89-s X-ray pulsar XTE J1906+09 was discovered. As a result of monitoring campaigns of SGR 1900+14, XTE J1906+09 was...
Large Torque Variations in Two Soft Gamma Repeaters (2001)
Woods, Peter M., Kouveliotou, Chryssa, Gougus, Ersin, Finger, Mark H., Swank, Jean, Markwardt, Craig B., ...
We have monitored the pulse frequencies of the two soft gamma repeaters SGR 1806-20 and SGR 1900+14 through the beginning of year 2001 using primarily Rossi X-ray Timing Explorer Proportional Counter...
Gogus, Ersin, Kouveliotou, Chryssa, Woods, Peter M., Thompson, Christopher, Duncan, Robert C., Briggs, Michael S.
We study the temporal and coarse spectral properties of 268 bursts from SGR 1806-20 and 679 bursts from SGR 1900+14, all observed with the Rossi X-Ray Timing Explorer/Proportional Counter Array....
The metamorphosis of SN1998bw (2001)
Patat, Ferdinando, Cappellaro, Enrico, Danziger, John, Mazzali, Paolo A., Sollerman, Jesper, Augusteijn, Thomas, ...
We present and discuss the photometric and spectroscopic evolution of the peculiar SN1998bw, associated with GRB980425, through an analysis of optical and near IR data collected at ESO-La Silla. The...
Discovery of a kHz QPO in 2S 0918-549 (2001)
Jonker, Peter G., Van Der Klis, Michiel, Homan, Jeroen, Mendez, Mariano, Van Paradijs, Jan, Belloni, Tomaso, ...
We report the discovery of a kilohertz quasi-periodic oscillation (kHz QPO) in the low-mass X-ray binary (LMXB) 2S 0918-549. The kHz QPO has a frequency of 1156+-9 Hz, a FWHM of 70+-20 Hz, and a...
Evidence for a Sudden Magnetic Field Reconfiguration in SGR 1900+14 (2001)
Woods, Peter M., Kouveliotou, Chryssa, Gogus, Ersin, Finger, Mark H., Swank, Jean, Smith, Don A., ...
We report the detection of large flux changes in the persistent X-ray flux of SGR 1900+14 during its burst active episode in 1998. Most notably, we find a factor ~700 increase in the non-burst X-ray...
Ibrahim, Alaa I., Strohmayer, Tod E., Woods, Peter M., Kouveliotou, Chryssa, Thompson, Christopher, Duncan, Robert C., ...
The Soft Gamma Repeater SGR 1900+14 entered a remarkable phase of activity during the summer of 1998. This activity peaked on August 27, 1998 when a giant periodic gamma-ray flare resembling the...
Woods, Peter M., Kouveliotou, Chryssa, Van Paradijs, Jan, Koshut, Thomas M., Finger, Mark H., Briggs, Michael S., ...
The hard X-ray bursts observed during both major outbursts of the Bursting Pulsar (GRO J1744-28) show pulsations near the neutron star spin frequency with an enhanced amplitude relative to that of...
Timing Noise in SGR 1806-20 (2000)
Woods, Peter M., Kouveliotou, Chryssa, Finger, Mark H., Gogus, Ersin, Scott, D. Matthew, Dieters, Stefan, ...
We have phase connected a sequence of RXTE PCA observations of SGR 1806-20 covering 178 days. We find a simple secular spin-down model does not adequately fit the data. The period derivative varies...
Statistical properties of SGR 1806-20 bursts (2000)
Gogus, Ersin, Woods, Peter M., Kouveliotou, Chryssa, Van Paradijs, Jan, Briggs, Michael S., Duncan, Robert C., ...
We present statistics of SGR 1806-20 bursts, combining 290 events detected with RXTE/PCA, 111 events detected with BATSE and 134 events detected with ICE. We find that the fluence distribution of...
Statistical properties of SGR 1900+14 bursts (1999)
Gogus, Ersin, Woods, Peter M., Kouveliotou, Chryssa, Van Paradijs, Jan, Briggs, Michael S., Duncan, Robert C., ...
We study the statistics of soft gamma repeater (SGR) bursts, using a data base of 187 events detected with BATSE and 837 events detected with RXTE PCA, all from SGR 1900+14 during its 1998-1999...
Hard Burst Emission from the Soft Gamma Repeater SGR 1900+14 (1999)
Woods, Peter M., Kouveliotou, Chryssa, Van Paradijs, Jan, Briggs, Michael S., Hurley, Kevin, Gogus, Ersin, ...
We present evidence for burst emission from SGR 1900+14 with a power-law high energy spectrum extending beyond 500 keV. Unlike previous detections of high energy photons during bursts from SGRs,...
Woods, Peter M., Kouveliotou, Chryssa, Van Paradijs, Jan, Finger, Mark H., Thompson, Christopher, Duncan, Robert C., ...
We have analyzed Rossi X-ray Timing Explorer Proportional Counter Array observations of the pulsed emission from SGR 1900+14 during September 1996, June - October 1998, and early 1999. Using these...
Discovery of a New Soft Gamma Repeater, SGR 1627-41 (1999)
Woods, Peter M., Kouveliotou, Chryssa, Van Paradijs, Jan, Hurley, Kevin, Kippen, R. Marc, Finger, Mark H., ...
We report the discovery of a new soft gamma repeater (SGR), SGR 1627-41, and present BATSE observations of the burst emission and BeppoSAX NFI observations of the probable persistent X-ray...
Fruchter, Andrew S., Thorsett, S. E., Metzger, Mark R., Sahu, Kailash C., Petro, Larry, Livio, Mario, ...
We report on HST and Palomar optical images of the field of GRB 990123, obtained on 8 and 9 February 1999. We find that the optical transient (OT) associated with GRB 990123 is located on an...
Discovery of a magnetar associated with the Soft Gamma Repeater SGR 1900+14 (1998)
Kouveliotou, Chryssa, Strohmayer, Tod, Hurley, Kevin, Van Paradijs, Jan, Finger, Mark H., Dieters, Stefan, ...
The soft-gamma repeater SGR 1900+14 became active again on June 1998 after a long period of quiescence; it remained at a low state of activity until August 1998, when it emitted a series of...
Rutledge, Robert E., Lewin, Walter H. G., Van Der Klis, Michiel, Van Paradijs, Jan, Dotani, Tadayasu, Vaughan, Brian, ...
By comparing positions on a spectral color-color diagram from 10 black hole candidates (BHCs) observed with Ginga (1354-64, 1826-24, 1630-47, LMC X-1, LMC X-3, GS 2000+25, GS 2023+33, GS 1124-68, Cyg...
HST/STIS Observations of the Optical Counterpart to GRB 970228 (1998)
Fruchter, Andrew S., Pian, Elena, Thorsett, Stephen E., Gonzalez, Rosa, Sahu, Kailash C., Mutchler, Max, ...
We report on observations of the fading optical counterpart of the gamma-ray burst GRB 970228, made on 4~September~1997 using the STIS CCD on the Hubble Space Telescope. The unresolved counterpart is...
The decay of optical emission from the Gamma-Ray Burst GRB 970228 (1997)
Galama, Titus J., Groot, Paul J., Van Paradijs, Jan, Kouveliotou, Chryssa, Sahu, Kailash C., Livio, Mario, ...
We present the R_c band light curve of the optical transient (OT) associated with GRB970228, based on re-evaluation of existing photometry. Data obtained until April 1997 suggested a slowing down of...
The Gamma Ray Bursts GRB970228 and GRB970508: What Have We Learnt? (1997)
Livio, Mario, Sahu, Kailash C., Petro, Larry, Fruchter, Andrew, Pian, Elena, Macchetto, F. Duccio, ...
We examine what we regard as key observational results on GRB 970228 and GRB 970508 and show that the accumulated evidence strongly suggests that gamma-ray bursts (GRBs) are cosmological fireballs....
Observations of GRB 970228 and GRB 970508, and the Neutron-Star Merger Model (1997)
Sahu, Kailash C., Livio, Mario, Petro, Larry, Bond, Howard E., Macchetto, F. Duccio, Galama, Titus J., ...
We present the discovery observations for the optical counterpart of the $\gamma$-ray burster GRB 970508 and discuss its light curve in the context of the fireball model. We analyze the HST data for...
Sahu, Kailash C., Livio, Mario, Petro, Larry, Macchetto, F. Duccio, Van Paradijs, Jan, Kouveliotou, Chryssa, ...
Although more than 2,000 astronomical gamma-ray bursts (GRBs) have been detected, and numerous models proposed to explain their occurrence, they have remained enigmatic owing to the lack of an...
Testing the Dipole and Quadrupole Moments of Galactic Models (1996)
Briggs, Michael S., Paciesas, William S., Pendleton, Geoffrey N., Meegan, Charles A., Fishman, Gerald J., Horack, John M., ...
If gamma-ray bursts originate in the Galaxy, at some level there should be a galactic pattern in their distribution on the sky. We test published galactic models by comparing their dipole and...
BATSE Observations of the Large-Scale Isotropy of Gamma-Ray Bursts (1995)
Briggs, Michael S., Paciesas, William S., Pendleton, Geoffrey N., Meegan, Charles A., Fishman, Gerald J., Horack, John M., ...
We use dipole and quadrupole statistics to test the large-scale isotropy of the first 1005 gamma-ray bursts observed by the Burst and Transient Source Experiment (BATSE). In addition to the entire...
Results from GROCSE, a real-time search for the Optical Counterparts of Gamma-Ray bursts (1995)
Akerlof, Carl W., Ables, Elden, Barthelmy, Scott, Bionta, Richard M., Cline, Thomas, Ferguson, Donald, ...
The GROCSE Collaboration (Gamma-Ray Optical Counterpart Search Experiment) has been operating a rapid response camera since January 1994 in an attempt to capture optical images of GRB events. This...
Do Gamma-Ray Burst Sources Repeat? (1995)
Meegan, Charles A., Hartmann, Dieter H., Brainerd, J. J., Briggs, Michael S., Paciesas, William S., Pendleton, Geoffrey, ...
The demonstration of repeated gamma-ray bursts from an individual source would severely constrain burst source models. Recent reports (Quashnock and Lamb 1993; Wang and Lingenfelter 1993) of evidence...
Recent x-ray observations have shown that a substantial fraction of newly born neutron stars have magnetic fields of several 1014 G. They reveal themselves as soft gamma repeaters and anomalous x-ray...
Recent x-ray observations have shown that a substantial fraction of newly born neutron stars have magnetic fields of several 1014 G. They reveal themselves as soft gamma repeaters and anomalous x-ray...