batgrbproduct Analysis for Trigger=321583
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): Sat Aug 23 23:28:38 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger321583/GCN5_download_cron
======================================================================
Trigger: 00321583 Segment: 000
BAT Trigger Time: 241205717.952 [s; MET]
Trigger Stop: 241205718.08 [s; MET]
UTC: 2008-08-23T17:35:14.910440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 75.2691768236207 Dec: 45.2772222629659 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 24.51
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 24.51
Flight Position: [ source = BAT ]
RA: 75.2691768236207 Dec: 45.2772222629659 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 75.2739672464128 Dec: 45.2678725525432 [deg; J2000]
{ 05h 01m 05.8s , +45d 16' 04.3" }
+/- 0.624289269446695 [arcmin] (estimated 90% radius based on SNR)
+/- 0.263216804231627 [arcmin] (formal 1-sigma fit error)
SNR: 59.6244354207143
Angular difference between Flight and Ground position is 0.596335 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 1.15200001001358 +/- 0.105223574023329
Measured from: -0.239999890327454
to: 0.912000119686127 [s; relative to TRIGTIME]
T50: 0.176000028848648 +/- 0.0164924197847099
Measured from: 0.0280000865459442
to: 0.204000115394592 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.035999983549118
to: 0.964000016450882 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.543999999761581
to: 0.992000013589859 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.324751 0.537051 0.294654 0.010527
0.009276 0.010920 0.008792 0.004951 [error]
Peak 0.281431 0.464878 0.247105 0.006321
0.008155 0.009772 0.007694 0.003996 [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 1.24e-07 1.81e-07 1.97e-07 4.01e-07 6.25e-07 9.38e-07 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Power-law 3.52e+00 2.76e+00 1.45e+00 1.10e+00 8.23e+00 8.83e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Fluence Cutoff-PL 7.70e-08 2.28e-07 2.26e-07 4.68e-08 5.72e-07 5.78e-07 erg/cm2
Error 6.69e-09 7.76e-09 1.04e-08 1.02e-08 1.96e-08 2.13e-08 erg/cm2
Peak flux Cutoff-PL 2.08e+00 3.43e+00 1.77e+00 1.81e-01 7.45e+00 7.47e+00 ph/cm2/s
Error 1.92e-01 1.19e-01 8.06e-02 3.79e-02 2.68e-01 2.70e-01 ph/cm2/s
Fluence Band 7.58e-08 2.27e-07 2.26e-07 4.68e-08 5.72e-07 6.70e-07 erg/cm2
Error 6.47e-09 5.31e-09 1.03e-08 1.64e-08 1.79e-08 0.00e+00 erg/cm2
Peak flux Band 2.04e+00 3.46e+00 1.77e+00 1.69e-01 7.41e+00 7.43e+00 ph/cm2/s
Error 2.40e-01 1.09e-01 7.84e-02 3.91e-02 2.30e-01 1.74e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.877 0.000 - - 4.43e-02 0.00e+00 345.966 57
CPL -0.819 0.337 51.6 1.5 1.00e+00 3.97e-01 50.053 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.928 0.000 - - 5.67e-02 0.00e+00 375.647 57
CPL -0.920 0.348 50.5 1.4 1.55e+00 6.38e-01 61.148 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: 1.152000 sec.
T50 in the 50-300 keV band: 0.192000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.536 -0.544 0.992
T90 1.152 -0.240 0.912
T50 0.176 0.028 0.204
Peak 1.000 -0.036 0.964
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.2740 +45.2679 0.0032 0.0 16.4 1.1747 59.6 TRIG_00321583
------------------------------------------
Foreground time interval of the image:
-0.544 0.992 (delta_t = 1.536 [sec])
Background time interval of the image:
-119.952 -0.544 (delta_t = 119.408 [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 -0.544 sec. to 0.992 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87725 ( )
Norm@50keV : 4.427122E-02 ( )
------------------------------------------------------------
Chi-Squared = 345.9657 using 59 PHA bins.
Reduced chi-squared = 6.069574 for 57 degrees of freedom
Null hypothesis probability = 5.437E-43
Photon flux (15-150 keV) in 1.536 sec: 6.29288 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.25127e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.544 sec. to 0.992 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.818956 ( -0.347251 0.326519 )
Epeak [keV] : 51.6392 ( -1.46606 1.55083 )
Norm@50keV : 1.00027 ( -0.309987 0.484804 )
------------------------------------------------------------
Chi-Squared = 50.05293 using 59 PHA bins.
Reduced chi-squared = 0.8938022 for 56 degrees of freedom
Null hypothesis probability = 0.698
Photon flux (15-150 keV) in 1.536 sec: 5.67396 ( -0.19944 0.20063 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.72102e-07 ( -1.95517e-08 1.971e-08 ) ergs/cm2
Band function
Time interval is from -0.544 sec. to 0.992 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.656983 ( -0.204501 0.555131 )
beta : -9.37167 ( -7.247925E-05 5.69133 )
Epeak [keV] : 52.0556 ( -1.69012 1.48144 )
Norm@50keV : 0.826694 ( -0.209805 0.629429 )
------------------------------------------------------------
Chi-Squared = 50.78923 using 59 PHA bins.
Reduced chi-squared = 0.9234406 for 55 degrees of freedom
Null hypothesis probability = 0.636
Photon flux (15-150 keV) in 1.536 sec: 5.67750 ( -0.20274 0.16411 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.71592e-07 ( -1.93475e-08 1.63937e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92811 ( )
Norm@50keV : 5.666113E-02 ( )
------------------------------------------------------------
Chi-Squared = 375.6465 using 59 PHA bins.
Reduced chi-squared = 6.590290 for 57 degrees of freedom
Null hypothesis probability = 0.00
Photon flux (15-150 keV) in 1.000 sec: 8.23013 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.21156e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.920033 ( -0.358475 0.336718 )
Epeak [keV] : 50.5483 ( -1.40072 1.46629 )
Norm@50keV : 1.54666 ( -0.493452 0.783263 )
------------------------------------------------------------
Chi-Squared = 61.14793 using 59 PHA bins.
Reduced chi-squared = 1.091927 for 56 degrees of freedom
Null hypothesis probability = 0.296
Photon flux (15-150 keV) in 1.000 sec: 7.45149 ( -0.26678 0.26858 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83383e-07 ( -1.6779e-08 1.6716e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 0.964 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.721687 ( -0.195521 0.619978 )
beta : -9.36852 ( -1.163483E-04 0.631337 )
Epeak [keV] : 51.0588 ( -1.62417 1.44968 )
Norm@50keV : 1.21676 ( -0.308825 1.06688 )
------------------------------------------------------------
Chi-Squared = 62.26050 using 59 PHA bins.
Reduced chi-squared = 1.132009 for 55 degrees of freedom
Null hypothesis probability = 0.234
Photon flux (15-150 keV) in 1.000 sec: 7.40755 ( -0.23937 0.22022 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.83673e-07 ( -1.6939e-08 1.4342e-08 ) ergs/cm2
Plot creation:
Sat Aug 23 23:38:31 EDT 2008