batgrbproduct Analysis for Trigger=292421
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done of the amount of data for this trigger downloaded to date.
- 3) This page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.41
Process Start Time (local time): Fri Dec 14 15:42:01 EST 2007
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger292421/GCN5_download_cron
======================================================================
Trigger: 00292421 Segment: 000
BAT Trigger Time: 212598586.496 [s; MET]
Trigger Stop: 212598588.544 [s; MET]
UTC: 2007-09-27T15:09:44.243160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 272.596794303661 Dec: -26.1768473691333 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.8
Image Trigger?: NO
Rate S/N Ratio: 9.64365076099295 [ if not an image trigger ]
Image S/N Ratio: 6.8
Flight Position: [ source = BAT ]
RA: 272.596794303661 Dec: -26.1768473691333 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 272.638868619338 Dec: -26.1330520166371 [deg; J2000]
{ 18h 10m 33.3s , -26d 07' 59.0" }
+/- 3.29378256089267 [arcmin] (estimated 90% radius based on SNR)
+/- 1.84319367699594 [arcmin] (formal 1-sigma fit error)
SNR: 5.54056686266097
RA = 18h 10m 33.3s (272.638869 deg.)
Dec = -26d 7' 59" (-26.133052 deg.)
Angular difference between Flight and Ground position is 3.469802 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
T50: 2.04800000786781 +/-
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 2.04800000786781 second)
Measured from: -1.49011611938477e-08
to: 2.04799999296665 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 2.04800000786781 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.064983 0.005060 -0.005661 -0.005898
0.008720 0.007252 0.006190 0.005736 [error]
Peak 0.064983 0.005060 -0.005661 -0.005898
0.008720 0.007252 0.006190 0.005736 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
=== Fluence/Peak Flux Summary ===
Model Band1 Band2 Band3 Band4 Band5 Total
15-25 25-50 50-100 100-350 15-150 15-350 keV
Fluence Power-law 1.61e-08 3.40e-09 3.61e-10 4.21e-11 1.99e-08 1.99e-08 erg/cm2
Error 4.28e-09 2.69e-09 7.10e-10 2.00e-10 6.74e-09 6.77e-09 erg/cm2
Peak flux Power-law 2.74e-01 3.36e-02 1.78e-03 9.93e-05 3.09e-01 3.09e-01 ph/cm2/s
Error 7.12e-02 2.52e-02 3.50e-03 4.39e-04 8.87e-02 8.87e-02 ph/cm2/s
Fluence Cutoff-PL 1.61e-08 3.41e-09 3.60e-10 4.18e-11 1.99e-08 1.99e-08 erg/cm2
Error 4.28e-09 2.69e-09 7.09e-10 1.99e-10 6.74e-09 6.78e-09 erg/cm2
Peak flux Cutoff-PL 3.03e-01 1.60e-02 2.81e-06 1.85e-14 3.19e-01 3.19e-01 ph/cm2/s
Error 7.77e-02 2.65e-02 2.36e-03 1.70e-06 8.49e-02 8.50e-02 ph/cm2/s
Fluence Band 1.59e-08 2.00e-08 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 5.42e-09 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 2.74e-01 3.36e-02 1.78e-03 9.85e-05 3.09e-01 3.09e-01 ph/cm2/s
Error 7.11e-02 2.52e-02 3.49e-03 4.35e-04 8.87e-02 8.87e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.936 1.341 - - 2.19e-04 2.56e-04 49.845 57
CPL 1.703 0.000 1.6 0.0 1.85e-01 0.00e+00 48.815 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.936 1.341 - - 2.19e-04 2.56e-04 49.845 57
CPL 1.703 0.000 1.6 0.0 1.85e-01 0.00e+00 48.815 56
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^-{Ph_index} (minus sign is not included in the index)
Ph_90err : 90% error of the photon index
Epeak : Epeak in keV
Epeak_90err: 90% error of Epeak
Norm : normalization at 50 keV in PL model and at 1 keV in CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedom
=== T90/T50 calculation in the 50-300 keV band (BATSE band) using 64 ms lc ===
T90 in the 50-300 keV band: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 2.048 0.000 2.048
T90 2.048 0.000 2.048
T50 2.048 0.000 2.048
Peak 2.048 -0.000 2.048
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
272.6389 -26.1331 0.0345 6.5 66.8 0.0775 5.5 TRIG_00292421
------------------------------------------
Foreground time interval of the image:
0.000 2.048 (delta_t = 2.048 [sec])
Background time interval of the image:
-239.496 -17.526 (delta_t = 221.970 [sec])
-16.496 -10.496 (delta_t = 6.000 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) For all the mask-weighted lightcurves, the y-axis units are counts/sec/det where a det is 0.4 x 0.4 = 0.16 sq cm.
- 4) The verticle lines correspond to following: green dotted lines are T50 interval, black dotted lines are T90 interval, blue solid line(s) is a spacecraft slew start time, and orange solid line(s) is a spacecraft slew end time.
- 5) Time of each bin is in the middle of the bin.
1 s binning
From T0-310 s to T0+310 s
From T100_start - 20 s to T100_end + 30 s
Full time interval
64 ms binning
Full time interval
From T100_start to T100_end
From T0-5 sec to T0+5 sec
16 ms binning
From T100_start-5 s to T100_start+5 s
8 ms binning
From T100_start-3 s to T100_start+3 s
2 ms binning
From T100_start-1 s to T100_start+1 s
SN=5 or 10 sec. binning (whichever binning is satisfied first)
SN=5 or 10 sec. binning (T < 200 sec)
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) For long bursts, a spectral fit of the pre-slew DRM will introduce some errors in both a spectral shape and a normalization if the PHA file contains a lot of the slew/post-slew time interval.
- 3) For fits to more complicated models (e.g. a power-law over a cutoff power-law), the BAT team has decided to require a chi-square improvement of more than 6 for each extra dof.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.93629 ( -0.843704 1.83868 )
Norm@50keV : 2.190258E-04 ( -2.190258E-04 2.932299E-04) )
------------------------------------------------------------
Chi-Squared = 49.84458 using 59 PHA bins.
Reduced chi-squared = 0.8744663 for 57 degrees of freedom
Null hypothesis probability = 0.738
Photon flux (15-150 keV) in 2.048 sec: 0.309293 ( -0.088365 0.089011 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99088e-08 ( -6.41274e-09 7.06415e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70293 ( )
Epeak [keV] : 1.59438 ( )
Norm@50keV : 0.184813 ( )
------------------------------------------------------------
Chi-Squared = 48.81537 using 59 PHA bins.
Reduced chi-squared = 0.8717031 for 56 degrees of freedom
Null hypothesis probability = 0.741
Photon flux (15-150 keV) in 2.048 sec: 0.318631 ( -0.084887 0.084887 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99081e-08 ( -6.42195e-09 7.05712e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.11257 ( -0.887435 4.21118 )
beta : -5.23714 ( -1.48384 1.11336 )
Epeak [keV] : 296.447 ( -296.347 9703.55 )
Norm@50keV : 2.168929E-02 ( -1.778886E-02 4.596723E-02) )
------------------------------------------------------------
Chi-Squared = 49.67793 using 59 PHA bins.
Reduced chi-squared = 0.9032351 for 55 degrees of freedom
Null hypothesis probability = 0.677
Photon flux (15-150 keV) in 2.048 sec: 0.308995 ( -0.088336 0.088983 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.93629 ( -0.843704 1.83868 )
Norm@50keV : 2.190258E-04 ( -2.190258E-04 2.932299E-04) )
------------------------------------------------------------
Chi-Squared = 49.84458 using 59 PHA bins.
Reduced chi-squared = 0.8744663 for 57 degrees of freedom
Null hypothesis probability = 0.738
Photon flux (15-150 keV) in 2.048 sec: 0.309293 ( -0.088365 0.089011 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99088e-08 ( -6.41274e-09 7.06415e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70293 ( )
Epeak [keV] : 1.59438 ( )
Norm@50keV : 0.184813 ( )
------------------------------------------------------------
Chi-Squared = 48.81537 using 59 PHA bins.
Reduced chi-squared = 0.8717031 for 56 degrees of freedom
Null hypothesis probability = 0.741
Photon flux (15-150 keV) in 2.048 sec: 0.318631 ( -0.084887 0.084887 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.99081e-08 ( -6.42195e-09 7.05712e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 2.048 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.11257 ( -0.301807 6.26560 )
beta : -5.23714 ( -3.38136 2.28890 )
Epeak [keV] : 296.447 ( -3.42379 6.94913 )
Norm@50keV : 2.168929E-02 ( -0.432674 29.2982 )
------------------------------------------------------------
Chi-Squared = 49.67793 using 59 PHA bins.
Reduced chi-squared = 0.9032351 for 55 degrees of freedom
Null hypothesis probability = 0.677
Photon flux (15-150 keV) in 2.048 sec: 0.308995 ( -0.088336 0.088983 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Plot creation:
Fri Dec 14 16:09:59 EST 2007