batgrbproduct Analysis for Trigger=152762
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 19:01:25 EST 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger152762/GCN5_download_cron
======================================================================
Trigger: 00152762 Segment: 000
BAT Trigger Time: 147114792 [s; MET]
Trigger Stop: 147114856 [s; MET]
UTC: 2005-08-30T17:13:12.297620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 13.7087559596663 Dec: -0.0987132569530423 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 33284
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 33284
Flight Position: [ source = BAT ]
RA: 13.7087559596663 Dec: -0.0987132569530423 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 13.6488206659982 Dec: -0.0290033337839847 [deg; J2000]
{ 00h 54m 35.7s , -00d 01' 44.4" }
+/- 5.08217974383218 [arcmin] (estimated 90% radius based on SNR)
+/- 3.12616990979556 [arcmin] (formal 1-sigma fit error)
SNR: 2.98177928308557
RA = 0h 54m 35.7s (13.648821 deg.)
Dec = 0d 1' 44" (-0.029003 deg.)
Angular difference between Flight and Ground position is 5.515990 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.063975 0.066016 -0.011501 0.003792
0.028148 0.028975 0.025589 0.022567 [error]
Peak 0.063975 0.066016 -0.011501 0.003792
0.028148 0.028975 0.025589 0.022567 [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 2.35e-08 1.80e-08 9.26e-09 6.83e-09 5.39e-08 5.85e-08 erg/cm2
Error 1.30e-08 1.54e-08 1.57e-08 3.37e-08 4.34e-08 6.33e-08 erg/cm2
Peak flux Power-law 2.36e-02 1.02e-02 2.61e-03 8.25e-04 3.69e-02 3.72e-02 ph/cm2/s
Error 1.33e-02 9.06e-03 4.26e-03 3.52e-03 2.08e-02 2.14e-02 ph/cm2/s
Fluence Cutoff-PL 2.36e-08 1.97e-08 6.50e-09 7.64e-10 5.05e-08 5.05e-08 erg/cm2
Error 1.33e-08 1.97e-08 1.56e-08 3.27e-08 4.27e-08 6.21e-08 erg/cm2
Peak flux Cutoff-PL 2.35e-02 1.12e-02 1.93e-03 1.20e-04 3.68e-02 3.68e-02 ph/cm2/s
Error 1.87e-02 1.08e-02 4.22e-03 3.43e-03 2.04e-02 2.10e-02 ph/cm2/s
Fluence Band 2.15e-08 1.80e-08 9.29e-09 6.91e-09 5.39e-08 7.18e-08 erg/cm2
Error 1.37e-08 9.48e-09 1.84e-08 2.75e-08 3.60e-08 0.00e+00 erg/cm2
Peak flux Band 2.31e-02 1.08e-02 3.03e-03 1.06e-03 3.74e-02 3.79e-02 ph/cm2/s
Error 1.32e-02 5.26e-03 7.07e-03 3.04e-03 2.86e-02 2.89e-02 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.962 2.191 - - 1.38e-04 1.69e-04 77.099 57
CPL 1.419 4.450 11.6 5000.0 1.60e-03 0.00e+00 77.047 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.962 2.191 - - 1.38e-04 1.69e-04 77.099 57
CPL 1.419 4.328 11.6 5000.0 1.60e-03 0.00e+00 77.047 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
13.6488 -0.0290 0.0638 22.6 40.8 0.1755 3.0 TRIG_00152762
------------------------------------------
Foreground time interval of the image:
0.000 33.092 (delta_t = 33.092 [sec])
Background time interval of the image:
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 33.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.96161 ( -1.23667 3.14487 )
Norm@50keV : 1.379510E-04 ( -1.379510E-04 2.006584E-04) )
------------------------------------------------------------
Chi-Squared = 77.09893 using 59 PHA bins.
Reduced chi-squared = 1.352613 for 57 degrees of freedom
Null hypothesis probability = 3.931E-02
Photon flux (15-150 keV) in 33.09 sec: 3.689361E-02 ( -0.0206685 0.020855 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39023e-08 ( -3.68662e-08 5.00076e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41851 ( -4.41851 4.48144 )
Epeak [keV] : 11.6152 ( -11.6052 9988.38 )
Norm@50keV : 1.600326E-03 ( )
------------------------------------------------------------
Chi-Squared = 77.04681 using 59 PHA bins.
Reduced chi-squared = 1.375836 for 56 degrees of freedom
Null hypothesis probability = 3.257E-02
Photon flux (15-150 keV) in 33.09 sec: 3.675009E-02 ( -0.0203011 0.0205103 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0502e-08 ( -3.27986e-08 5.26654e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.54711 ( -8.45289 6.54711 )
beta : -4.00020 ( -4.168129E-02 8.22162 )
Epeak [keV] : 10.2173 ( -10.1173 9989.78 )
Norm@50keV : 1.259331E-03 ( -1.261017E-03 39.2998 )
------------------------------------------------------------
Chi-Squared = 77.05481 using 59 PHA bins.
Reduced chi-squared = 1.400997 for 55 degrees of freedom
Null hypothesis probability = 2.649E-02
Photon flux (15-150 keV) in 33.09 sec: 3.743992E-02 ( -0.0374399 0.0196724 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38715e-08 ( -2.68144e-08 2.82814e-08 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 33.092 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.96161 ( -1.23667 3.14487 )
Norm@50keV : 1.379510E-04 ( -1.379510E-04 2.006584E-04) )
------------------------------------------------------------
Chi-Squared = 77.09893 using 59 PHA bins.
Reduced chi-squared = 1.352613 for 57 degrees of freedom
Null hypothesis probability = 3.931E-02
Photon flux (15-150 keV) in 33.09 sec: 3.689361E-02 ( -0.0206685 0.020855 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.39023e-08 ( -3.68662e-08 5.00076e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 33.092 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.41851 ( -4.41851 4.23666 )
Epeak [keV] : 11.6152 ( -11.6052 9988.38 )
Norm@50keV : 1.600326E-03 ( )
------------------------------------------------------------
Chi-Squared = 77.04681 using 59 PHA bins.
Reduced chi-squared = 1.375836 for 56 degrees of freedom
Null hypothesis probability = 3.257E-02
Photon flux (15-150 keV) in 33.09 sec: 3.675009E-02 ( -0.0203011 0.0205103 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.0502e-08 ( -3.27986e-08 5.26654e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 33.092 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.54711 ( -8.45289 6.54711 )
beta : -4.00020 ( -4.168129E-02 19.8069 )
Epeak [keV] : 10.2173 ( -10.1173 9989.78 )
Norm@50keV : 1.259331E-03 ( -1.261017E-03 39.2998 )
------------------------------------------------------------
Chi-Squared = 77.05481 using 59 PHA bins.
Reduced chi-squared = 1.400997 for 55 degrees of freedom
Null hypothesis probability = 2.649E-02
Photon flux (15-150 keV) in 33.09 sec: 3.743992E-02 ( -0.0374399 0.0196724 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38715e-08 ( -2.68144e-08 2.82814e-08 ) ergs/cm2
Plot creation:
Tue Jan 8 19:06:34 EST 2008