batgrbproduct Analysis for Trigger=325707
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 Sep 24 05:21:31 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger325707/GCN5_download_cron
======================================================================
Trigger: 00325707 Segment: 000
BAT Trigger Time: 243899360.448 [s; MET]
Trigger Stop: 243899360.576 [s; MET]
UTC: 2008-09-23T21:49:17.326900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 288.385413040623 Dec: 25.8321049701656 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.53
Image Trigger?: NO
Rate S/N Ratio: 6.40312423743285 [ if not an image trigger ]
Image S/N Ratio: 6.53
Flight Position: [ source = BAT ]
RA: 288.385413040623 Dec: 25.8321049701656 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 288.361407126141 Dec: 25.8738205593016 [deg; J2000]
{ 19h 13m 26.7s , +25d 52' 25.8" }
+/- 3.73652515050086 [arcmin] (estimated 90% radius based on SNR)
+/- 2.31603511457257 [arcmin] (formal 1-sigma fit error)
SNR: 4.62708076622614
Angular difference between Flight and Ground position is 2.818655 arcmin
Partial Coding Fraction: 0.96875 [ including projection effects ]
Duration
T90: 0.127999991178513 +/-
Measured from: 0
to: 0.127999991178513 [s; relative to TRIGTIME]
T50: 0.127999991178513 +/-
Measured from: 0
to: 0.127999991178513 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.127999991178513 second)
Measured from: 1.49011611938477e-08
to: 0.128000006079674 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.127999991178513 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.000305 0.009284 0.005809 -0.001185
0.001798 0.001935 0.001726 0.001405 [error]
Peak 0.000305 0.009284 0.005809 -0.001185
0.001798 0.001935 0.001726 0.001405 [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 1.12e-09 1.64e-09 1.79e-09 3.68e-09 5.67e-09 8.24e-09 erg/cm2
Error 6.14e-10 7.54e-10 9.62e-10 3.18e-09 2.70e-09 4.69e-09 erg/cm2
Peak flux Power-law 2.83e-01 2.29e-01 1.26e-01 1.01e-01 6.83e-01 7.38e-01 ph/cm2/s
Error 1.57e-01 1.06e-01 6.62e-02 8.22e-02 3.16e-01 3.39e-01 ph/cm2/s
Fluence Cutoff-PL 8.10e-10 3.50e-09 3.10e-09 2.57e-10 7.65e-09 7.70e-09 erg/cm2
Error 3.90e-10 1.14e-09 1.60e-09 5.04e-10 2.61e-09 2.63e-09 erg/cm2
Peak flux Cutoff-PL 1.96e-01 4.70e-01 2.32e-01 1.11e-02 9.06e-01 9.05e-01 ph/cm2/s
Error 9.63e-02 1.57e-01 1.21e-01 2.03e-02 2.81e-01 2.81e-01 ph/cm2/s
Fluence Band 1.03e-09 3.12e-09 3.40e-09 6.90e-10 8.07e-09 8.03e-09 erg/cm2
Error 7.96e-10 1.37e-09 1.00e-09 2.70e-09 2.68e-09 0.00e+00 erg/cm2
Peak flux Band 2.18e-01 4.71e-01 2.38e-01 9.03e-03 8.84e-01 9.08e-01 ph/cm2/s
Error 1.58e-01 1.21e-01 1.63e-02 2.75e-01 2.93e-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 1.850 0.500 - - 4.86e-03 2.27e-03 83.746 57
CPL -2.500 0.000 48.2 10.9 1.36e+00 2.77e+00 68.006 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.850 0.500 - - 4.86e-03 2.27e-03 83.746 57
CPL -2.500 0.000 48.2 10.9 1.36e+00 2.77e+00 68.006 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 0.128 0.000 0.128
T90 0.128 0.000 0.128
T50 0.128 0.000 0.128
Peak 0.128 0.000 0.128
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
288.3614 +25.8738 0.0416 22.2 -164.5 0.0155 4.6 TRIG_00325707
------------------------------------------
Foreground time interval of the image:
0.000 0.128 (delta_t = 0.128 [sec])
Background time interval of the image:
-239.448 -8.448 (delta_t = 231.000 [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.
- 4) For short bursts (T90<1sec), the specrtum is also fit with Blackbody, OTTB, and Double Blackbody.
Time averaged spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84962 ( -0.450896 0.548386 )
Norm@50keV : 4.859243E-03 ( -2.330722E-03 2.211995E-03) )
------------------------------------------------------------
Chi-Squared = 83.74614 using 59 PHA bins.
Reduced chi-squared = 1.469231 for 57 degrees of freedom
Null hypothesis probability = 1.207E-02
Photon flux (15-150 keV) in 0.1280 sec: 0.682765 ( -0.316222 0.315844 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67148e-09 ( -2.67393e-09 2.71638e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.50000 ( )
Epeak [keV] : 48.2227 ( -10.3014 11.4192 )
Norm@50keV : 1.35821 ( -1.97284 3.55948 )
------------------------------------------------------------
Chi-Squared = 68.00561 using 59 PHA bins.
Reduced chi-squared = 1.214386 for 56 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 0.1280 sec: 0.905618 ( -0.280223 0.281432 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64553e-09 ( -2.47887e-09 2.73213e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.82698 ( -12.8270 2.17302 )
beta : -9.37167 ( -4.444122E-04 0.627885 )
Epeak [keV] : 51.5568 ( -50.4943 10.4926 )
Norm@50keV : 1.44302 ( -4.51186 9.65253 )
------------------------------------------------------------
Chi-Squared = 67.83742 using 59 PHA bins.
Reduced chi-squared = 1.233408 for 55 degrees of freedom
Null hypothesis probability = 0.115
Photon flux (15-150 keV) in 0.1280 sec: 0.883931 ( -0.272801 0.276259 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.06944e-09 ( -2.83201e-09 2.57784e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84962 ( -0.450896 0.548386 )
Norm@50keV : 4.859243E-03 ( -2.330722E-03 2.211995E-03) )
------------------------------------------------------------
Chi-Squared = 83.74614 using 59 PHA bins.
Reduced chi-squared = 1.469231 for 57 degrees of freedom
Null hypothesis probability = 1.207E-02
Photon flux (15-150 keV) in 0.1280 sec: 0.682765 ( -0.316222 0.315844 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.67148e-09 ( -2.67393e-09 2.71638e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.50000 ( )
Epeak [keV] : 48.2227 ( -10.3014 11.4192 )
Norm@50keV : 1.35821 ( -1.97284 3.55948 )
------------------------------------------------------------
Chi-Squared = 68.00561 using 59 PHA bins.
Reduced chi-squared = 1.214386 for 56 degrees of freedom
Null hypothesis probability = 0.130
Photon flux (15-150 keV) in 0.1280 sec: 0.905618 ( -0.280223 0.281432 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.64553e-09 ( -2.47887e-09 2.73213e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.82698 ( -12.8270 2.17302 )
beta : -9.37167 ( -4.444122E-04 19.9996 )
Epeak [keV] : 51.5568 ( -50.4943 10.4926 )
Norm@50keV : 1.44302 ( -4.51186 9.65253 )
------------------------------------------------------------
Chi-Squared = 67.83742 using 59 PHA bins.
Reduced chi-squared = 1.233408 for 55 degrees of freedom
Null hypothesis probability = 0.115
Photon flux (15-150 keV) in 0.1280 sec: 0.883931 ( -0.272801 0.276259 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.06944e-09 ( -2.83201e-09 2.57784e-09 ) ergs/cm2
Plot creation:
Wed Sep 24 05:44:54 EDT 2008