batgrbproduct Analysis for Trigger=147788
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): Tue Jan 8 09:43:56 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger147788/SDC
======================================================================
Trigger: 00147788 Segment: 000
BAT Trigger Time: 144046817.472 [s; MET]
Trigger Stop: 144046825.664 [s; MET]
UTC: 2005-07-26T05:00:17.830940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 200.0645009276 Dec: -32.0902643464852 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33600
Image Trigger?: NO
Rate S/N Ratio: 23.6220236220354 [ if not an image trigger ]
Image S/N Ratio: 33600
Flight Position: [ source = BAT ]
RA: 200.0645009276 Dec: -32.0902643464852 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 200.026790695494 Dec: -32.0636198892784 [deg; J2000]
{ 13h 20m 06.4s , -32d 03' 49.0" }
+/- 1.8172536442574 [arcmin] (estimated 90% radius based on SNR)
+/- 0.787197626971821 [arcmin] (formal 1-sigma fit error)
SNR: 12.9576050769549
RA = 13h 20m 6.4s (200.026791 deg.)
Dec = -32d 3' 49" (-32.063620 deg.)
Angular difference between Flight and Ground position is 2.496271 arcmin
Partial Coding Fraction: 0.1484375 [ including projection effects ]
Duration
T90: 49.6799999475479 +/- 14.3682227284407
Measured from: -36.3039999902248
to: 13.3759999573231 [s; relative to TRIGTIME]
T50: 18.4959999620914 +/- 7.44043008996833
Measured from: -12.2240000069141
to: 6.27199995517731 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.07600000500679
to: 2.07600000500679 [s; relative to TRIGTIME]
Total Fluence
Measured from: -40.8160000145435
to: 15.6319999992847 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.488917 0.673853 0.989544 0.294157
0.102531 0.097108 0.085109 0.070486 [error]
Peak 0.020736 0.067927 0.066043 0.008080
0.014417 0.014250 0.014199 0.010250 [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 1.25e-07 3.35e-07 7.18e-07 4.00e-06 1.94e-06 5.17e-06 erg/cm2
Error 3.46e-08 5.55e-08 7.81e-08 1.05e-06 2.10e-07 1.05e-06 erg/cm2
Peak flux Power-law 2.90e-01 4.16e-01 4.44e-01 8.81e-01 1.42e+00 2.03e+00 ph/cm2/s
Error 1.60e-01 1.43e-01 9.75e-02 4.16e-01 3.65e-01 4.58e-01 ph/cm2/s
Fluence Cutoff-PL 9.97e-08 3.34e-07 7.77e-07 2.20e-06 1.92e-06 3.12e-06 erg/cm2
Error 4.62e-08 6.06e-08 1.12e-07 2.22e-06 2.16e-07 1.84e-06 erg/cm2
Peak flux Cutoff-PL 2.89e-01 4.16e-01 4.45e-01 8.76e-01 1.42e+00 2.03e+00 ph/cm2/s
Error 1.60e-01 1.44e-01 9.76e-02 4.14e-01 3.65e-01 4.56e-01 ph/cm2/s
Fluence Band 9.93e-08 3.33e-07 7.75e-07 2.20e-06 1.92e-06 3.38e-06 erg/cm2
Error 4.58e-08 6.04e-08 1.12e-07 1.84e-06 2.16e-07 1.82e-06 erg/cm2
Peak flux Band 2.47e-01 4.46e-01 4.53e-01 8.36e-01 1.41e+00 1.97e+00 ph/cm2/s
Error 1.26e-01 9.97e-02 2.84e-01 3.33e-01 3.57e-01 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.898 0.207 - - 3.05e-03 3.83e-04 67.982 57
CPL 0.266 0.966 181.7 4947.0 5.28e-03 5.15e-03 66.507 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.905 0.416 - - 1.24e-02 3.19e-03 57.555 57
CPL 0.898 0.420 9997.4 5000.0 1.25e-02 3.20e-03 57.558 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: 23.552000 sec.
T50 in the 50-300 keV band: 7.680000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 56.448 -40.816 15.632
T90 49.680 -36.304 13.376
T50 18.496 -12.224 6.272
Peak 1.000 1.076 2.076
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
200.0268 -32.0636 0.0147 40.0 -113.3 2.7679 13.0 TRIG_00147788
------------------------------------------
Foreground time interval of the image:
-40.816 15.632 (delta_t = 56.448 [sec])
Background time interval of the image:
-299.472 -40.816 (delta_t = 258.656 [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 -40.816 sec. to 15.632 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.898129 ( -0.213876 0.201016 )
Norm@50keV : 3.051649E-03 ( -3.876761E-04 3.777156E-04) )
------------------------------------------------------------
Chi-Squared = 67.98234 using 59 PHA bins.
Reduced chi-squared = 1.192673 for 57 degrees of freedom
Null hypothesis probability = 0.151
Photon flux (15-150 keV) in 56.45 sec: 0.350259 ( -0.043789 0.044917 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.935e-06 ( -2.10265e-07 2.10203e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -40.816 sec. to 15.632 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.265531 ( -1.12205 0.810345 )
Epeak [keV] : 181.709 ( -75.6276 9818.29 )
Norm@50keV : 5.283593E-03 ( -2.461822E-03 7.830732E-03) )
------------------------------------------------------------
Chi-Squared = 66.50723 using 59 PHA bins.
but latest trial 0.964913 gives Chi-Squared = 1.92282
Reduced chi-squared = 1.187629 for 56 degrees of freedom
Null hypothesis probability = 0.159
Photon flux (15-150 keV) in 56.45 sec: 0.339321 ( -0.045636 0.046709 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91832e-06 ( -2.1709e-07 2.14391e-07 ) ergs/cm2
Band function
Time interval is from -40.816 sec. to 15.632 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.827799 ( -9.17220 5.82780 )
beta : -0.898136 ( -0.200935 0.214055 )
Epeak [keV] : 16.5555 ( -9999.90 9.765625E-04) )
Norm@50keV : 4.320979E-03 ( -3.891259E-04 3.777931E-04) )
------------------------------------------------------------
Chi-Squared = 67.98235 using 59 PHA bins.
Reduced chi-squared = 1.236043 for 55 degrees of freedom
Null hypothesis probability = 0.112
Photon flux (15-150 keV) in 56.45 sec: 0.339312 ( -0.045785 0.046722 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.91734e-06 ( -2.16966e-07 2.1451e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 1.072 sec. to 2.080 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.905226 ( -0.443192 0.388548 )
Norm@50keV : 1.240799E-02 ( -3.294403E-03 3.089213E-03) )
------------------------------------------------------------
Chi-Squared = 57.55465 using 59 PHA bins.
Reduced chi-squared = 1.009731 for 57 degrees of freedom
Null hypothesis probability = 0.455
Photon flux (15-150 keV) in 1.008 sec: 1.42427 ( -0.36256 0.36815 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40078e-07 ( -3.08871e-08 3.08902e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.072 sec. to 2.080 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.898027 ( -0.447531 0.391662 )
Epeak [keV] : 9997.38 ( -9997.37 2.62402 )
Norm@50keV : 1.249088E-02 ( -3.301090E-03 3.097066E-03) )
------------------------------------------------------------
Chi-Squared = 57.55795 using 59 PHA bins.
Reduced chi-squared = 1.027820 for 56 degrees of freedom
Null hypothesis probability = 0.417
Photon flux (15-150 keV) in 1.008 sec: 1.42391 ( -0.36239 0.36806 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40178e-07 ( -3.09174e-08 3.09093e-08 ) ergs/cm2
Band function
Time interval is from 1.072 sec. to 2.080 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.754119E-02 ( -14.9128 8.718586E-02) )
beta : -0.936578 ( -0.531617 0.533859 )
Epeak [keV] : 64.3445 ( -40.2635 9959.64 )
Norm@50keV : 5.363400E-02 ( -61.4060 57.3930 )
------------------------------------------------------------
Chi-Squared = 57.24910 using 59 PHA bins.
Reduced chi-squared = 1.040893 for 55 degrees of freedom
Null hypothesis probability = 0.392
Photon flux (15-150 keV) in 1.008 sec: 1.40666 ( -0.34412 0.32117 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40088e-07 ( -3.09043e-08 3.08821e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 09:55:04 EST 2008