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Multicolor Infrared Observations of SN 2006aj, the Supernova Associated with XRF 060218 - Paper I
Daniel Kocevski, Maryam Modjaz, Joshua S. Bloom +8
We report simultaneous multicolor near-infrared (NIR) observations of the supernova associated with x-ray Flash 060218 during the first 16 days after the high energy event. We find…
The Interstellar Medium of GRB Host Galaxies I. Echelle Spectra of Swift GRB Afterglows
J. X. Prochaska, H. -W. Chen, J. S. Bloom +8
We present optical echelle spectra of four gamma-ray burst (GRB) afterglows (GRB 050730, GRB 050820, GRB 051111, and GRB 060418) discovered during the first 1.5 years of operation…
No supernovae associated with two long-duration gamma ray bursts
Johan P. U. Fynbo, Darach Watson, Christina C. Thoene +28
It is now accepted that long duration gamma-ray bursts (GRBs) are produced during the collapse of a massive star. The standard "collapsar" model predicts that a broad-lined and lum…
On the Incidence of Strong MgII Absorbers Along GRB Sightlines
G. E. Prochter, J. X. Prochaska, H. -W. Chen +7
We report on a survey for strong (rest equivalent width W_r >= 1A), intervening MgII systems along the sightlines to long-duration gamma-ray bursts (GRBs). The GRB spectra which co…
The 2005 outburst of the halo black hole X-ray transient XTE J1118+480
C. Zurita, M. A. P. Torres, D. Steeghs +15
We present optical and infrared monitoring of the 2005 outburst of the halo black hole X-ray transient XTE J1118+480. We measured a total outburst amplitude of ~5.7+-0.1 mag in the…
Constraints on the Diverse Progenitors of GRBs from the Large-Scale Environments
J. S. Bloom, J. X. Prochaska
The pursuit of the progenitors of short duration-hard spectrum gamma-ray bursts (SHBs) draws strongly upon similar quests for the origin of supernovae (SNe) and long duration-soft…
Dissecting the Circumstellar Environment of Gamma-Ray Burst Progenitors
Jason X. Prochaska, Hsiao-Wen Chen, Joshua S. Bloom
We investigate properties of the interstellar medium (ISM) in galaxies hosting long-duration gamma-ray bursts (GRBs) from an analysis of atomic species (MgI, FeI) and excited fine-…