batgrbproduct Analysis for Trigger=321252
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 Aug 22 23:01:18 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger321252/GCN5_download_cron
======================================================================
Trigger: 00321252 Segment: 000
BAT Trigger Time: 241118973.056 [s; MET]
Trigger Stop: 241118973.12 [s; MET]
UTC: 2008-08-22T17:29:30.017000 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 75.2659467744855 Dec: 45.2898284963173 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.31
Image Trigger?: NO
Rate S/N Ratio: 19.5959179422654 [ if not an image trigger ]
Image S/N Ratio: 8.31
Flight Position: [ source = BAT ]
RA: 75.2659467744855 Dec: 45.2898284963173 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 75.2879027083038 Dec: 45.2740443126816 [deg; J2000]
{ 05h 01m 09.1s , +45d 16' 26.6" }
+/- 2.24143817577983 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02711052401354 [arcmin] (formal 1-sigma fit error)
SNR: 9.60209192383283
Angular difference between Flight and Ground position is 1.325172 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.0600000023841858 +/- 0.0144221930009071
Measured from: 0.0160000920295715
to: 0.0760000944137573 [s; relative to TRIGTIME]
T50: 0.0360000133514404 +/- 0.0203960901646241
Measured from: 0.0280000865459442
to: 0.0640000998973846 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.449999988079071
to: 0.550000011920929 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0119999945163727
to: 0.0839999914169312 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.010062 0.011311 0.011805 -0.001811
0.001631 0.001818 0.001852 0.001066 [error]
Peak 0.009575 0.011909 0.011626 -0.001910
0.001682 0.001840 0.001911 0.001076 [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 3.13e-09 4.06e-09 3.89e-09 6.63e-09 1.33e-08 1.71e-08 erg/cm2
Error 6.41e-10 7.11e-10 1.05e-09 3.18e-09 2.64e-09 4.74e-09 erg/cm2
Peak flux Power-law 1.32e+00 9.51e-01 4.54e-01 3.05e-01 2.87e+00 3.03e+00 ph/cm2/s
Error 2.85e-01 1.71e-01 1.22e-01 1.41e-01 5.11e-01 5.46e-01 ph/cm2/s
Fluence Cutoff-PL 2.45e-09 5.60e-09 5.18e-09 1.43e-09 1.44e-08 1.46e-08 erg/cm2
Error 7.89e-10 1.09e-09 1.62e-09 1.52e-09 2.84e-09 3.12e-09 erg/cm2
Peak flux Cutoff-PL 9.53e-01 1.33e+00 6.51e-01 8.01e-02 3.00e+00 3.01e+00 ph/cm2/s
Error 3.60e-01 2.53e-01 2.02e-01 8.00e-02 5.21e-01 5.24e-01 ph/cm2/s
Fluence Band 2.44e-09 5.57e-09 5.18e-09 1.44e-09 1.44e-08 1.47e-08 erg/cm2
Error 4.57e-10 9.09e-10 9.09e-10 1.93e-09 2.20e-09 3.60e-09 erg/cm2
Peak flux Band 9.89e-01 1.31e+00 6.52e-01 8.78e-02 3.00e+00 3.05e+00 ph/cm2/s
Error 1.76e-01 2.33e-01 1.09e-01 7.82e-02 5.06e-01 5.41e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.059 0.254 - - 1.99e-02 4.20e-03 64.486 57
CPL 0.002 1.347 48.9 10.5 2.43e-01 7.45e-01 54.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.068 0.261 - - 1.85e-02 4.05e-03 61.964 57
CPL -0.364 1.539 49.0 9.5 3.49e-01 1.37e+00 49.921 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 0.072 0.012 0.084
T90 0.060 0.016 0.076
T50 0.036 0.028 0.064
Peak 1.000 -0.450 0.550
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
75.2879 +45.2740 0.0199 0.0 -97.2 0.0318 9.6 TRIG_00321252
------------------------------------------
Foreground time interval of the image:
0.012 0.084 (delta_t = 0.072 [sec])
Background time interval of the image:
-112.755 -107.246 (delta_t = 5.509 [sec])
-106.056 0.012 (delta_t = 106.068 [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 0.012 sec. to 0.084 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05900 ( -0.234278 0.273266 )
Norm@50keV : 1.991623E-02 ( -4.270941E-03 4.120979E-03) )
------------------------------------------------------------
Chi-Squared = 64.48625 using 59 PHA bins.
Reduced chi-squared = 1.131338 for 57 degrees of freedom
Null hypothesis probability = 0.231
Photon flux (15-150 keV) in 7.2000E-02 sec: 3.07142 ( -0.52698 0.52699 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.32614e-08 ( -2.6203e-09 2.66566e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.084 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.578158E-03 ( -1.53322 1.16102 )
Epeak [keV] : 48.9041 ( -10.2124 10.7035 )
Norm@50keV : 0.242909 ( -0.242909 1.24651 )
------------------------------------------------------------
Chi-Squared = 54.41002 using 59 PHA bins.
Reduced chi-squared = 0.9716076 for 56 degrees of freedom
Null hypothesis probability = 0.535
Photon flux (15-150 keV) in 7.2000E-02 sec: 3.20890 ( -0.2682 0.53504 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44095e-08 ( -2.81981e-09 2.86862e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.084 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.361366E-02 ( -1.17520 1.51668 )
beta : -9.33769 ( -0.662311 19.3377 )
Epeak [keV] : 48.8331 ( -9.21863 10.7627 )
Norm@50keV : 0.247756 ( -0.247756 1.24116 )
------------------------------------------------------------
Chi-Squared = 54.41134 using 59 PHA bins.
Reduced chi-squared = 0.9892972 for 55 degrees of freedom
Null hypothesis probability = 0.497
Photon flux (15-150 keV) in 7.2000E-02 sec: 3.20945 ( -0.53175 0.53038 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44085e-08 ( -1.54267e-09 2.85451e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.012 sec. to 0.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06762 ( -0.239597 0.281421 )
Norm@50keV : 1.853508E-02 ( -4.119801E-03 3.975272E-03) )
------------------------------------------------------------
Chi-Squared = 61.96385 using 59 PHA bins.
Reduced chi-squared = 1.087085 for 57 degrees of freedom
Null hypothesis probability = 0.304
Photon flux (15-150 keV) in 7.6000E-02 sec: 2.87029 ( -0.51074 0.51077 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30519e-08 ( -2.68082e-09 2.69724e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.012 sec. to 0.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.363553 ( -1.79550 1.28330 )
Epeak [keV] : 49.0366 ( -9.21122 9.70957 )
Norm@50keV : 0.348729 ( -0.271018 2.46847 )
------------------------------------------------------------
Chi-Squared = 49.92139 using 59 PHA bins.
Reduced chi-squared = 0.8914534 for 56 degrees of freedom
Null hypothesis probability = 0.703
Photon flux (15-150 keV) in 7.6000E-02 sec: 3.00404 ( -0.522 0.52027 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43559e-08 ( -2.86664e-09 2.92957e-09 ) ergs/cm2
Band function
Time interval is from 0.012 sec. to 0.088 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.188554 ( -1.11675 1.98661 )
beta : -9.36310 ( -0.636899 6.37610 )
Epeak [keV] : 49.0243 ( -9.12561 9.78523 )
Norm@50keV : 0.285102 ( -4.743455E-02 2.56908 )
------------------------------------------------------------
Chi-Squared = 49.96283 using 59 PHA bins.
Reduced chi-squared = 0.9084151 for 55 degrees of freedom
Null hypothesis probability = 0.667
Photon flux (15-150 keV) in 7.6000E-02 sec: 2.99593 ( -0.51313 0.49885 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42335e-08 ( -2.76982e-09 2.83016e-09 ) ergs/cm2
Plot creation:
Fri Aug 22 23:17:18 EDT 2008