Astronomy and Astrophysics – Astrophysics
Scientific paper
2005-02-17
Astrophys.J. 629 (2005) 908-914
Astronomy and Astrophysics
Astrophysics
21 pages, 7 figures, submitted to ApJ
Scientific paper
10.1086/431644
We present high resolution X-ray spectroscopy of two recent GRB afterglows observed with the Low Energy Transmission Gratings on Chandra. The afterglows to GRBs 030328 and 041006 are detected beginning 15.33 and 16.8 hours after each burst, respectively, and are observed to fade in time during each ~90 ksec observation. We fit for the continuum emission in each full data set and for the data sliced into half and quarter time sections. For both afterglows, the continuum emission is well described by an absorbed power-law model, and the model parameters describing the absorption and spectral slope do not appear to evolve in time. We perform a careful search for deviations from the model continua for the full and time-sliced data and find no evidence for significant (>~3sigma) narrow emission/absorption lines or edges. The lack of detections implies that line emission--if it is a general feature in GRB X-ray afterglows--occurs early (t~0.3 days in the source frame) and/or is short-lived (dt<~10 ksec). We also comment on synchrotron fireball models for the X-ray and optical data.
Butler Nathaniel R.
Ford Peter G.
Garmire Gordon P.
Jernigan Garret J.
Lamb Don Q.
No associations
LandOfFree
High Resolution Gratings Spectroscopy of GRBs 030382 and 041006 with Chandra LETGS does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with High Resolution Gratings Spectroscopy of GRBs 030382 and 041006 with Chandra LETGS, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and High Resolution Gratings Spectroscopy of GRBs 030382 and 041006 with Chandra LETGS will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-97023