batgrbproduct Analysis for Trigger=163136
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): Wed Jan 9 17:37:24 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger163136/GCN5_download_cron
======================================================================
Trigger: 00163136 Segment: 000
BAT Trigger Time: 153191540.352 [s; MET]
Trigger Stop: 153191542.4 [s; MET]
UTC: 2005-11-09T01:12:20.522800 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 330.295827113925 Dec: 40.8374744574041 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.47
Image Trigger?: NO
Rate S/N Ratio: 20.0748598998847 [ if not an image trigger ]
Image S/N Ratio: 11.47
Flight Position: [ source = BAT ]
RA: 330.295827113925 Dec: 40.8374744574041 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 330.315813088037 Dec: 40.8494066755485 [deg; J2000]
{ 22h 01m 15.8s , +40d 50' 57.9" }
+/- 2.07362264509422 [arcmin] (estimated 90% radius based on SNR)
+/- 1.09084746071135 [arcmin] (formal 1-sigma fit error)
SNR: 10.7311765875339
RA = 22h 1m 15.8s (330.315813 deg.)
Dec = 40d 50' 58" (40.849407 deg.)
Angular difference between Flight and Ground position is 1.155640 arcmin
Partial Coding Fraction: 0.08691406 [ including projection effects ]
Duration
T90: 37.231999963522 +/- 7.08958896788783
Measured from: -2.53599998354912
to: 34.6959999799728 [s; relative to TRIGTIME]
T50: 23.3759999871254 +/- 16.3303888555325
Measured from: 0.263999998569489
to: 23.6399999856949 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.684000015258789
to: 1.68400001525879 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.71999999880791
to: 41.6559999883175 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.583496 1.238031 1.003147 0.193108
0.122990 0.127599 0.114575 0.102637 [error]
Peak 0.082209 0.185135 0.149319 0.060035
0.021206 0.025306 0.023286 0.017967 [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 3.00e-07 5.48e-07 7.69e-07 2.25e-06 2.20e-06 3.90e-06 erg/cm2
Error 6.54e-08 7.35e-08 1.08e-07 6.79e-07 2.72e-07 7.51e-07 erg/cm2
Peak flux Power-law 1.31e+00 1.32e+00 9.35e-01 1.06e+00 3.97e+00 4.61e+00 ph/cm2/s
Error 3.66e-01 2.39e-01 1.60e-01 3.51e-01 6.77e-01 7.20e-01 ph/cm2/s
Fluence Cutoff-PL 2.57e-07 5.92e-07 8.33e-07 9.06e-07 2.14e-06 2.59e-06 erg/cm2
Error 7.91e-08 9.05e-08 1.32e-07 1.02e-06 2.19e-07 1.03e-06 erg/cm2
Peak flux Cutoff-PL 1.10e+00 1.44e+00 1.06e+00 5.15e-01 3.93e+00 4.11e+00 ph/cm2/s
Error 4.36e-01 2.98e-01 2.25e-01 5.34e-01 6.79e-01 8.28e-01 ph/cm2/s
Fluence Band 2.38e-07 6.15e-07 7.94e-07 1.52e-06 2.13e-06 3.20e-06 erg/cm2
Error 6.25e-08 9.92e-08 1.34e-07 8.26e-07 2.68e-07 1.06e-06 erg/cm2
Peak flux Band 9.85e-01 1.54e+00 1.01e+00 7.51e-01 3.87e+00 4.28e+00 ph/cm2/s
Error 4.78e-01 2.29e-01 2.09e-01 4.03e-01 6.77e-01 7.68e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.514 0.199 - - 5.13e-03 6.10e-04 63.575 57
CPL 0.702 0.972 85.5 4969.1 1.26e-02 2.03e-02 61.025 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.495 0.241 - - 3.19e-02 4.97e-03 45.972 57
CPL 0.595 1.217 84.1 4968.3 8.75e-02 1.79e-01 44.124 0
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: 60.800000 sec.
T50 in the 50-300 keV band: 32.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 45.376 -3.720 41.656
T90 37.232 -2.536 34.696
T50 23.376 0.264 23.640
Peak 1.000 0.684 1.684
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
330.3158 +40.8494 0.0180 53.6 7.4 2.3360 10.7 TRIG_00163136
------------------------------------------
Foreground time interval of the image:
-3.720 23.649 (delta_t = 27.369 [sec])
Background time interval of the image:
-299.352 -3.720 (delta_t = 295.632 [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 -3.720 sec. to 41.656 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51352 ( -0.199031 0.198015 )
Norm@50keV : 5.133163E-03 ( -6.100186E-04 6.099786E-04) )
------------------------------------------------------------
Chi-Squared = 63.57544 using 59 PHA bins.
Reduced chi-squared = 1.115359 for 57 degrees of freedom
Null hypothesis probability = 0.256
Photon flux (15-150 keV) in 45.38 sec: 0.643181 ( -0.082943 0.083484 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20496e-06 ( -2.71899e-07 2.72766e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -3.720 sec. to 41.656 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.702184 ( -1.08501 0.859434 )
Epeak [keV] : 85.4725 ( -23.6543 9914.53 )
Norm@50keV : 1.258949E-02 ( -1.258949E-02 2.803807E-02) )
------------------------------------------------------------
Chi-Squared = 61.02455 using 59 PHA bins.
Reduced chi-squared = 1.089724 for 56 degrees of freedom
Null hypothesis probability = 0.300
Photon flux (15-150 keV) in 45.38 sec: 0.623706 ( -0.085247 0.085855 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.1389e-06 ( -2.92919e-07 1.44295e-07 ) ergs/cm2
Band function
Time interval is from -3.720 sec. to 41.656 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.266779E-02 ( -1.76826 4.29567 )
beta : -1.93364 ( -8.06636 0.462222 )
Epeak [keV] : 59.9099 ( -32.3465 227.285 )
Norm@50keV : 3.151229E-02 ( -3.151229E-02 52.7847 )
------------------------------------------------------------
Chi-Squared = 60.14006 using 59 PHA bins.
Reduced chi-squared = 1.093456 for 55 degrees of freedom
Null hypothesis probability = 0.295
Photon flux (15-150 keV) in 45.38 sec: 0.614233 ( -0.081638 0.084563 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.12799e-06 ( -2.73346e-07 2.62714e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.680 sec. to 1.688 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49488 ( -0.243220 0.238206 )
Norm@50keV : 3.187673E-02 ( -4.967075E-03 4.963998E-03) )
------------------------------------------------------------
Chi-Squared = 45.97169 using 59 PHA bins.
Reduced chi-squared = 0.8065209 for 57 degrees of freedom
Null hypothesis probability = 0.852
Photon flux (15-150 keV) in 1.008 sec: 3.97404 ( -0.67525 0.67846 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05095e-07 ( -4.85211e-08 4.85523e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.680 sec. to 1.688 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.595019 ( -1.40179 1.03192 )
Epeak [keV] : 84.1382 ( -20.7449 9915.86 )
Norm@50keV : 8.746977E-02 ( -5.214784E-02 0.306217 )
------------------------------------------------------------
Chi-Squared = 44.12372 using 59 PHA bins.
but latest trial 49.1902 gives Chi-Squared = 9.13274
but latest trial 3.502822E-02 gives Chi-Squared = 2.84932
Reduced chi-squared = 0.7879235 for 56 degrees of freedom
Null hypothesis probability = 0.875
Photon flux (15-150 keV) in 1.008 sec: 3.93076 ( -0.67692 0.68061 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02456e-07 ( -5.01057e-08 4.94807e-08 ) ergs/cm2
Band function
Time interval is from 0.680 sec. to 1.688 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.433470 ( -3.17273 4.01432 )
beta : -1.95768 ( -8.04232 0.530897 )
Epeak [keV] : 55.6432 ( -31.3067 407.520 )
Norm@50keV : 0.353365 ( -0.316225 176.866 )
------------------------------------------------------------
Chi-Squared = 42.97250 using 59 PHA bins.
Reduced chi-squared = 0.7813181 for 55 degrees of freedom
Null hypothesis probability = 0.881
Photon flux (15-150 keV) in 1.008 sec: 3.87031 ( -0.69398 0.65922 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.02053e-07 ( -4.99706e-08 4.95684e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 17:59:19 EST 2008