batgrbproduct Analysis for Trigger=159578
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 15:58:10 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger159578/GCN5_download_cron
======================================================================
Trigger: 00159578 Segment: 000
BAT Trigger Time: 150915026.496 [s; MET]
Trigger Stop: 150915027.52 [s; MET]
UTC: 2005-10-13T16:50:26.715020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.514751588183 Dec: -4.39859472838639 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 33404
Image Trigger?: NO
Rate S/N Ratio: 14.5258390463339 [ if not an image trigger ]
Image S/N Ratio: 33404
Flight Position: [ source = BAT ]
RA: 247.514751588183 Dec: -4.39859472838639 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.474830269804 Dec: -4.38317046291593 [deg; J2000]
{ 16h 29m 54.0s , -04d 22' 59.4" }
+/- 3.76101325632778 [arcmin] (estimated 90% radius based on SNR)
+/- 2.29927796954066 [arcmin] (formal 1-sigma fit error)
SNR: 4.5841021672321
RA = 16h 29m 54.0s (247.474830 deg.)
Dec = -4d 22' 59" (-4.383170 deg.)
Angular difference between Flight and Ground position is 2.561289 arcmin
Partial Coding Fraction: 1.015625 [ 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 0.000669 0.007208 0.019927 0.021861
0.006240 0.005999 0.005947 0.006721 [error]
Peak 0.000669 0.007208 0.019927 0.021861
0.006240 0.005999 0.005947 0.006721 [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 3.76e-10 2.20e-09 1.12e-08 2.52e-07 3.61e-08 2.11e-07 erg/cm2
Error 7.47e-10 2.51e-09 8.36e-09 3.37e-07 1.55e-08 0.00e+00 erg/cm2
Peak flux Power-law 1.13e-02 3.53e-02 9.01e-02 6.58e-01 2.45e-01 7.94e-01 ph/cm2/s
Error 2.30e-02 4.15e-02 6.80e-02 7.77e-01 1.84e-01 7.31e-01 ph/cm2/s
Fluence Cutoff-PL 1.21e-10 1.65e-09 1.34e-08 7.16e-08 3.80e-08 7.65e-08 erg/cm2
Error 1.82e-09 7.17e-09 3.65e-07 1.63e-08 3.78e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.13e-02 3.52e-02 9.02e-02 6.55e-01 2.45e-01 7.92e-01 ph/cm2/s
Error 2.30e-02 4.15e-02 6.81e-02 8.35e-01 1.84e-01 7.87e-01 ph/cm2/s
Fluence Band 4.47e-11 1.24e-09 1.38e-08 5.19e-08 3.86e-08 1.24e-07 erg/cm2
Error 1.01e-08 3.06e-08 1.66e-08 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.34e-03 1.75e-02 1.06e-01 2.30e-01 2.42e-01 3.60e-01 ph/cm2/s
Error 1.48e-02 2.30e-02 6.59e-02 7.69e-01 1.01e-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 -0.352 1.821 - - 1.57e-03 1.46e-03 61.828 57
CPL -0.375 1.157 9999.3 0.0 1.59e-03 0.00e+00 61.817 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -0.352 1.821 - - 1.57e-03 1.46e-03 61.828 57
CPL -0.375 1.157 9999.3 0.0 1.59e-03 0.00e+00 61.817 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 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
247.4748 -4.3832 0.0420 10.6 -7.8 0.0571 4.6 TRIG_00159578
------------------------------------------
Foreground time interval of the image:
0.000 1.024 (delta_t = 1.024 [sec])
Background time interval of the image:
-88.395 -53.943 (delta_t = 34.453 [sec])
-52.496 -10.496 (delta_t = 42.000 [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: -0.352374 ( -2.64763 0.994207 )
Norm@50keV : 1.567813E-03 ( -1.567813E-03 1.357056E-03) )
------------------------------------------------------------
Chi-Squared = 61.82800 using 59 PHA bins.
Reduced chi-squared = 1.084702 for 57 degrees of freedom
Null hypothesis probability = 0.308
Photon flux (15-150 keV) in 1.024 sec: 0.244818 ( -0.244818 0.123155 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60864e-08 ( -1.54638e-08 1.54636e-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: -0.375305 ( -1.30767 1.00648 )
Epeak [keV] : 9999.28 ( )
Norm@50keV : 1.586428E-03 ( )
------------------------------------------------------------
Chi-Squared = 61.81678 using 59 PHA bins.
but latest trial -2.91445 gives Chi-Squared = 2.90401
Reduced chi-squared = 1.103871 for 56 degrees of freedom
Null hypothesis probability = 0.276
Photon flux (15-150 keV) in 1.024 sec: 0.244958 ( -0.244958 0.122981 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8003e-08 ( -1.62869e-08 1.6278e-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 : -0.576957 ( -9.42304 5.57696 )
beta : 0.353082 ( -0.994914 9.64692 )
Epeak [keV] : 18.9597 ( -18.8597 9981.04 )
Norm@50keV : 2.266907E-03 ( -2.266907E-03 4058.92 )
------------------------------------------------------------
Chi-Squared = 61.82800 using 59 PHA bins.
Reduced chi-squared = 1.124145 for 55 degrees of freedom
Null hypothesis probability = 0.245
Photon flux (15-150 keV) in 1.024 sec: 0.241722 ( -0.100228 0.10151 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.863e-08 ( -1.64652e-08 1.66619e-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: -0.352374 ( -2.64763 0.994207 )
Norm@50keV : 1.567813E-03 ( -1.567813E-03 1.357056E-03) )
------------------------------------------------------------
Chi-Squared = 61.82800 using 59 PHA bins.
Reduced chi-squared = 1.084702 for 57 degrees of freedom
Null hypothesis probability = 0.308
Photon flux (15-150 keV) in 1.024 sec: 0.244818 ( -0.244818 0.123155 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60864e-08 ( -1.54638e-08 1.54636e-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: -0.375305 ( -1.30767 1.00648 )
Epeak [keV] : 9999.28 ( )
Norm@50keV : 1.586428E-03 ( )
------------------------------------------------------------
Chi-Squared = 61.81678 using 59 PHA bins.
but latest trial -2.91445 gives Chi-Squared = 2.90401
Reduced chi-squared = 1.103871 for 56 degrees of freedom
Null hypothesis probability = 0.276
Photon flux (15-150 keV) in 1.024 sec: 0.244958 ( -0.244958 0.122981 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8003e-08 ( -1.62869e-08 1.6278e-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 : -0.576957 ( -9.42304 5.57696 )
beta : 0.353082 ( -0.994914 9.64692 )
Epeak [keV] : 18.9597 ( -18.8597 9981.04 )
Norm@50keV : 2.266907E-03 ( -2.266907E-03 4058.92 )
------------------------------------------------------------
Chi-Squared = 61.82800 using 59 PHA bins.
Reduced chi-squared = 1.124145 for 55 degrees of freedom
Null hypothesis probability = 0.245
Photon flux (15-150 keV) in 1.024 sec: 0.241722 ( -0.100228 0.10151 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.863e-08 ( -1.64652e-08 1.66619e-08 ) ergs/cm2
Plot creation:
Wed Jan 9 16:19:53 EST 2008