batgrbproduct Analysis for Trigger=155072
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 10:43:17 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger155072/GCN5_download_cron
======================================================================
Trigger: 00155072 Segment: 000
BAT Trigger Time: 148390034.496 [s; MET]
Trigger Stop: 148390035.52 [s; MET]
UTC: 2005-09-14T11:27:14.767600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 59.5071049566699 Dec: -16.6335264883827 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33419
Image Trigger?: NO
Rate S/N Ratio: 19.0525588832576 [ if not an image trigger ]
Image S/N Ratio: 33419
Flight Position: [ source = BAT ]
RA: 59.5071049566699 Dec: -16.6335264883827 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 59.5309298797545 Dec: -16.6591964061427 [deg; J2000]
{ 03h 58m 07.4s , -16d 39' 33.1" }
+/- 3.59365243767704 [arcmin] (estimated 90% radius based on SNR)
+/- 2.31643454482567 [arcmin] (formal 1-sigma fit error)
SNR: 4.89210106372782
RA = 3h 58m 7.4s (59.530930 deg.)
Dec = -16d 39' 33" (-16.659196 deg.)
Angular difference between Flight and Ground position is 2.061060 arcmin
Partial Coding Fraction: 0.3867188 [ including projection effects ]
Duration
T90: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
T50: 1.02400001883507 +/-
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1.02400001883507 second)
Measured from: 1.49011611938477e-08
to: 1.02400003373623 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1.02400001883507 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.010998 -0.003957 0.052465 0.036845
0.009725 0.010942 0.010508 0.009191 [error]
Peak 0.010998 -0.003957 0.052465 0.036845
0.009725 0.010942 0.010508 0.009191 [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 1.10e-09 5.80e-09 2.64e-08 4.89e-07 8.15e-08 4.16e-07 erg/cm2
Error 1.55e-09 4.72e-09 9.59e-09 3.66e-07 2.21e-08 0.00e+00 erg/cm2
Peak flux Power-law 3.34e-02 9.37e-02 2.13e-01 1.30e+00 5.75e-01 1.64e+00 ph/cm2/s
Error 4.78e-02 7.86e-02 7.92e-02 8.45e-01 2.26e-01 7.46e-01 ph/cm2/s
Fluence Cutoff-PL 3.15e-10 4.39e-09 3.32e-08 1.35e-07 8.80e-08 1.47e-07 erg/cm2
Error 1.05e-09 3.10e-09 1.31e-08 3.28e-07 2.40e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 3.32e-02 9.36e-02 2.13e-01 1.29e+00 5.75e-01 1.63e+00 ph/cm2/s
Error 4.76e-02 7.79e-02 8.70e-02 8.42e-01 2.24e-01 7.53e-01 ph/cm2/s
Fluence Band 1.69e-10 3.70e-09 3.45e-08 2.09e-07 8.58e-08 1.35e-07 erg/cm2
Error 1.31e-08 3.45e-07 2.35e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 4.81e-03 4.29e-02 2.67e-01 6.60e-01 5.58e-01 7.51e-01 ph/cm2/s
Error 5.62e-02 1.14e-01 7.39e-01 1.72e-01 7.61e-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 -0.185 0.732 - - 3.97e-03 3.27e-03 65.966 0
CPL -2.500 0.000 164.0 133.5 1.52e-02 3.21e-02 64.165 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.185 0.732 - - 3.97e-03 3.27e-03 65.966 0
CPL -2.500 0.000 164.0 133.5 1.52e-02 3.21e-02 64.165 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: 0.768000 sec.
T50 in the 50-300 keV band: 0.448000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.024 0.000 1.024
T90 1.024 0.000 1.024
T50 1.024 0.000 1.024
Peak 1.024 0.000 1.024
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
59.5309 -16.6592 0.0394 45.7 -175.6 0.0983 4.9 TRIG_00155072
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-299.496 -10.496 (delta_t = 289.000 [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 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.184983 ( -0.810251 0.654297 )
Norm@50keV : 3.965259E-03 ( -3.965259E-03 2.581113E-03) )
------------------------------------------------------------
Chi-Squared = 65.96629 using 59 PHA bins.
but latest trial -1.35733 gives Chi-Squared = 3.20647
Reduced chi-squared = 1.157303 for 57 degrees of freedom
Null hypothesis probability = 0.195
Photon flux (15-150 keV) in 1.024 sec: 0.574712 ( -0.218523 0.233529 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.15351e-08 ( -2.02702e-08 2.39554e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49989 ( )
Epeak [keV] : 164.024 ( -148.989 117.981 )
Norm@50keV : 1.515457E-02 ( -1.978104E-02 4.447612E-02) )
------------------------------------------------------------
Chi-Squared = 64.16524 using 59 PHA bins.
but latest trial 248.478 gives Chi-Squared = 0.736671
Reduced chi-squared = 1.145808 for 56 degrees of freedom
Null hypothesis probability = 0.212
Photon flux (15-150 keV) in 1.024 sec: 0.574978 ( -0.214727 0.233179 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7956e-08 ( -2.40229e-08 2.40594e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.541164 ( -9.45884 5.54116 )
beta : 0.182110 ( -0.651328 0.992371 )
Epeak [keV] : 13.8351 ( -13.7351 9986.17 )
Norm@50keV : 6.667587E-03 ( -6.667587E-03 11157.4 )
------------------------------------------------------------
Chi-Squared = 65.96633 using 59 PHA bins.
Reduced chi-squared = 1.199388 for 55 degrees of freedom
Null hypothesis probability = 0.148
Photon flux (15-150 keV) in 1.024 sec: 0.557628 ( -0.16163 0.181615 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58349e-08 ( -2.32824e-08 2.37792e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.184983 ( -0.810251 0.654297 )
Norm@50keV : 3.965259E-03 ( -3.965259E-03 2.581113E-03) )
------------------------------------------------------------
Chi-Squared = 65.96629 using 59 PHA bins.
but latest trial -1.35733 gives Chi-Squared = 3.20647
Reduced chi-squared = 1.157303 for 57 degrees of freedom
Null hypothesis probability = 0.195
Photon flux (15-150 keV) in 1.024 sec: 0.574712 ( -0.218523 0.233529 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.15351e-08 ( -2.02702e-08 2.39554e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.024 sec.
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.49989 ( )
Epeak [keV] : 164.024 ( -148.989 117.981 )
Norm@50keV : 1.515457E-02 ( -1.978104E-02 4.447612E-02) )
------------------------------------------------------------
Chi-Squared = 64.16524 using 59 PHA bins.
but latest trial 248.478 gives Chi-Squared = 0.736671
Reduced chi-squared = 1.145808 for 56 degrees of freedom
Null hypothesis probability = 0.212
Photon flux (15-150 keV) in 1.024 sec: 0.574978 ( -0.214727 0.233179 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.7956e-08 ( -2.40229e-08 2.40594e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.024 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.541164 ( -9.45884 5.54116 )
beta : 0.182110 ( -0.651328 0.992371 )
Epeak [keV] : 13.8351 ( -13.7351 9986.17 )
Norm@50keV : 6.667587E-03 ( -6.667587E-03 11157.4 )
------------------------------------------------------------
Chi-Squared = 65.96633 using 59 PHA bins.
Reduced chi-squared = 1.199388 for 55 degrees of freedom
Null hypothesis probability = 0.148
Photon flux (15-150 keV) in 1.024 sec: 0.557628 ( -0.16163 0.181615 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.58349e-08 ( -2.32824e-08 2.37792e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 10:57:53 EST 2008