batgrbproduct Analysis for Trigger=315710
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): Thu Jul 3 00:33:07 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger315710/GCN5_download_cron
======================================================================
Trigger: 00315710 Segment: 000
BAT Trigger Time: 236692246.592 [s; MET]
Trigger Stop: 236692247.104 [s; MET]
UTC: 2008-07-02T11:50:43.681940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 312.852867899564 Dec: 72.3078003909001 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.6
Image Trigger?: NO
Rate S/N Ratio: 13.0384048104053 [ if not an image trigger ]
Image S/N Ratio: 6.6
Flight Position: [ source = BAT ]
RA: 312.852867899564 Dec: 72.3078003909001 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 313.086117260721 Dec: 72.2871417253539 [deg; J2000]
{ 20h 52m 20.7s , +72d 17' 13.7" }
+/- 3.20198581756443 [arcmin] (estimated 90% radius based on SNR)
+/- 1.21229276330512 [arcmin] (formal 1-sigma fit error)
SNR: 5.76886877337146
Angular difference between Flight and Ground position is 4.432361 arcmin
Partial Coding Fraction: 0.8125 [ including projection effects ]
Duration
T90: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
T50: 0.511999994516373 +/-
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.511999994516373 second)
Measured from: -1.49011611938477e-08
to: 0.511999979615211 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.511999994516373 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.009296 0.020661 0.015981 0.001183
0.004304 0.004667 0.004230 0.003598 [error]
Peak 0.009296 0.020661 0.015981 0.001183
0.004304 0.004667 0.004230 0.003598 [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 3.08e-09 6.64e-09 1.12e-08 4.36e-08 3.09e-08 6.55e-08 erg/cm2
Error 1.48e-09 2.03e-09 3.90e-09 4.25e-08 9.89e-09 3.60e-08 erg/cm2
Peak flux Power-law 1.93e-01 2.27e-01 1.92e-01 2.74e-01 7.10e-01 8.86e-01 ph/cm2/s
Error 9.41e-02 7.11e-02 6.47e-02 1.91e-01 2.03e-01 2.70e-01 ph/cm2/s
Fluence Cutoff-PL 2.62e-09 7.47e-09 1.19e-08 1.11e-08 2.84e-08 3.30e-08 erg/cm2
Error 1.67e-09 2.62e-09 4.69e-09 3.56e-08 1.06e-08 3.89e-08 erg/cm2
Peak flux Cutoff-PL 1.61e-01 2.52e-01 2.08e-01 9.36e-02 6.84e-01 7.14e-01 ph/cm2/s
Error 1.06e-01 8.90e-02 7.76e-02 2.22e-01 2.07e-01 3.07e-01 ph/cm2/s
Fluence Band 2.63e-09 7.75e-09 1.11e-08 2.85e-08 2.94e-08 4.69e-08 erg/cm2
Error 1.66e-09 2.57e-09 4.73e-09 3.76e-08 7.77e-09 4.83e-08 erg/cm2
Peak flux Band 1.61e-01 2.52e-01 2.08e-01 9.31e-02 6.84e-01 7.13e-01 ph/cm2/s
Error 1.06e-01 8.90e-02 7.76e-02 2.14e-01 2.07e-01 3.07e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.243 0.471 - - 6.01e-03 1.72e-03 55.620 57
CPL 0.164 1.924 84.6 4990.2 2.12e-02 2.53e-01 54.558 0
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.243 0.471 - - 6.01e-03 1.72e-03 55.620 57
CPL 0.164 1.924 84.6 4990.2 2.12e-02 2.53e-01 54.558 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 0.512 0.000 0.512
T90 0.512 0.000 0.512
T50 0.512 0.000 0.512
Peak 0.512 -0.000 0.512
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
313.0861 +72.2871 0.0334 17.1 -98.2 0.0493 5.8 TRIG_00315710
------------------------------------------
Foreground time interval of the image:
0.000 0.512 (delta_t = 0.512 [sec])
Background time interval of the image:
-239.592 -6.592 (delta_t = 233.000 [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 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24270 ( -0.476687 0.464548 )
Norm@50keV : 6.010517E-03 ( -1.720254E-03 1.712049E-03) )
------------------------------------------------------------
Chi-Squared = 55.61976 using 59 PHA bins.
Reduced chi-squared = 0.9757853 for 57 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 0.5120 sec: 0.710050 ( -0.20316 0.20364 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08727e-08 ( -9.74925e-09 1.00288e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.164403 ( -2.70333 1.14467 )
Epeak [keV] : 84.5551 ( -64.9082 9915.45 )
Norm@50keV : 2.124553E-02 ( -1.655595E-02 0.488502 )
------------------------------------------------------------
Chi-Squared = 54.55761 using 59 PHA bins.
but latest trial 1.92469 gives Chi-Squared = 6.49387
but latest trial 32.4605 gives Chi-Squared = 2.36921
Reduced chi-squared = 0.9742430 for 56 degrees of freedom
Null hypothesis probability = 0.530
Photon flux (15-150 keV) in 0.5120 sec: 0.684394 ( -0.206353 0.20749 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83731e-08 ( -1.02506e-08 1.08782e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.161072 ( -1.43790 2.35129 )
beta : -8.88589 ( -1.11411 8.01107 )
Epeak [keV] : 84.3990 ( -46.3798 9915.60 )
Norm@50keV : 2.133816E-02 ( -1.664768E-02 0.491884 )
------------------------------------------------------------
Chi-Squared = 54.55760 using 59 PHA bins.
Reduced chi-squared = 0.9919564 for 55 degrees of freedom
Null hypothesis probability = 0.491
Photon flux (15-150 keV) in 0.5120 sec: 0.684055 ( -0.206566 0.208207 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93866e-08 ( -1.02572e-08 5.28881e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.24270 ( -0.476687 0.464548 )
Norm@50keV : 6.010517E-03 ( -1.720254E-03 1.712049E-03) )
------------------------------------------------------------
Chi-Squared = 55.61976 using 59 PHA bins.
Reduced chi-squared = 0.9757853 for 57 degrees of freedom
Null hypothesis probability = 0.527
Photon flux (15-150 keV) in 0.5120 sec: 0.710050 ( -0.20316 0.20364 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.08727e-08 ( -9.74925e-09 1.00288e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.512 sec.
Parameters : value lower 90% higher 90%
Photon index: 0.164403 ( -2.70333 1.14467 )
Epeak [keV] : 84.5551 ( -64.9082 9915.45 )
Norm@50keV : 2.124553E-02 ( -1.655595E-02 0.488502 )
------------------------------------------------------------
Chi-Squared = 54.55761 using 59 PHA bins.
but latest trial 1.92469 gives Chi-Squared = 6.49387
but latest trial 32.4605 gives Chi-Squared = 2.36921
Reduced chi-squared = 0.9742430 for 56 degrees of freedom
Null hypothesis probability = 0.530
Photon flux (15-150 keV) in 0.5120 sec: 0.684394 ( -0.206353 0.20749 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.83731e-08 ( -1.02506e-08 1.08782e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.512 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.161072 ( -1.43790 2.35129 )
beta : -8.88589 ( -1.11411 8.01107 )
Epeak [keV] : 84.3990 ( -46.3798 9915.60 )
Norm@50keV : 2.133816E-02 ( -1.664768E-02 0.491884 )
------------------------------------------------------------
Chi-Squared = 54.55760 using 59 PHA bins.
Reduced chi-squared = 0.9919564 for 55 degrees of freedom
Null hypothesis probability = 0.491
Photon flux (15-150 keV) in 0.5120 sec: 0.684055 ( -0.206566 0.208207 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.93866e-08 ( -1.02572e-08 5.28881e-09 ) ergs/cm2
Plot creation:
Thu Jul 3 01:00:52 EDT 2008