batgrbproduct Analysis for Trigger=332287
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 Oct 21 17:20:01 EDT 2008
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger332287/GCN5_download_cron
======================================================================
Trigger: 00332287 Segment: 000
BAT Trigger Time: 246280830.08 [s; MET]
Trigger Stop: 246280830.336 [s; MET]
UTC: 2008-10-21T11:20:26.887860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 301.006315352213 Dec: 21.6824280352001 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.72
Image Trigger?: NO
Rate S/N Ratio: 8.18535277187245 [ if not an image trigger ]
Image S/N Ratio: 6.72
Flight Position: [ source = BAT ]
RA: 301.006315352213 Dec: 21.6824280352001 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 301.158806848159 Dec: 21.6842784360087 [deg; J2000]
{ 20h 04m 38.1s , +21d 41' 03.4" }
+/- 3.28673833109995 [arcmin] (estimated 90% radius based on SNR)
+/- 2.07645563134671 [arcmin] (formal 1-sigma fit error)
SNR: 5.55753850510983
Angular difference between Flight and Ground position is 8.502796 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.255999982357025 +/-
Measured from: 0
to: 0.255999982357025 [s; relative to TRIGTIME]
T50: 0.255999982357025 +/-
Measured from: 0
to: 0.255999982357025 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.255999982357025 second)
Measured from: 0
to: 0.255999982357025 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.255999982357025 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.009232 0.012636 -0.000120 -0.000335
0.002703 0.002696 0.002311 0.001806 [error]
Peak 0.009232 0.012636 -0.000120 -0.000335
0.002703 0.002696 0.002311 0.001806 [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 1.97e-09 2.95e-09 3.29e-09 6.97e-09 1.03e-08 1.50e-08 erg/cm2
Error 9.53e-10 1.10e-09 1.85e-09 7.94e-09 4.55e-09 1.01e-08 erg/cm2
Peak flux Power-law 2.50e-01 2.06e-01 1.15e-01 9.48e-02 6.13e-01 6.66e-01 ph/cm2/s
Error 1.23e-01 7.67e-02 6.28e-02 1.00e-01 2.28e-01 2.52e-01 ph/cm2/s
Fluence Cutoff-PL 2.32e-09 4.34e-09 9.32e-10 6.13e-12 7.63e-09 7.57e-09 erg/cm2
Error 9.93e-10 1.57e-09 1.02e-09 7.40e-11 2.65e-09 2.64e-09 erg/cm2
Peak flux Cutoff-PL 2.89e-01 3.10e-01 3.72e-02 1.28e-04 6.35e-01 6.35e-01 ph/cm2/s
Error 1.24e-01 1.08e-01 4.55e-02 1.58e-03 2.06e-01 2.06e-01 ph/cm2/s
Fluence Band 1.98e-09 3.75e-09 2.77e-09 2.57e-09 8.58e-09 1.12e-08 erg/cm2
Error 1.27e-09 1.35e-09 1.53e-09 2.46e-09 9.26e-09 0.00e+00 erg/cm2
Peak flux Band 2.61e-01 2.62e-01 9.55e-02 3.36e-02 6.40e-01 6.30e-01 ph/cm2/s
Error 2.04e-01 9.28e-02 4.53e-02 4.09e-02 2.22e-01 2.37e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.841 0.615 - - 4.37e-03 1.92e-03 57.426 57
CPL -2.487 0.000 32.1 6.6 4.50e+00 1.39e+01 51.131 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.841 0.615 - - 4.37e-03 1.92e-03 57.426 57
CPL -2.487 0.000 32.1 6.6 4.50e+00 1.39e+01 51.131 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 0.256 0.000 0.256
T90 0.256 0.000 0.256
T50 0.256 0.000 0.256
Peak 0.256 0.000 0.256
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
301.1588 +21.6843 0.0344 2.5 72.0 0.0267 5.6 TRIG_00332287
------------------------------------------
Foreground time interval of the image:
0.000 0.256 (delta_t = 0.256 [sec])
Background time interval of the image:
-114.779 -6.080 (delta_t = 108.699 [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 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84071 ( -0.595098 0.635607 )
Norm@50keV : 4.374767E-03 ( -1.935544E-03 1.903146E-03) )
------------------------------------------------------------
Chi-Squared = 57.42608 using 59 PHA bins.
Reduced chi-squared = 1.007475 for 57 degrees of freedom
Null hypothesis probability = 0.459
Photon flux (15-150 keV) in 0.2560 sec: 0.612971 ( -0.228232 0.228232 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03163e-08 ( -4.38556e-09 4.71736e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.48680 ( )
Epeak [keV] : 32.0532 ( -5.96484 7.24029 )
Norm@50keV : 4.49950 ( -10.1530 17.5543 )
------------------------------------------------------------
Chi-Squared = 51.13101 using 59 PHA bins.
Reduced chi-squared = 0.9130537 for 56 degrees of freedom
Null hypothesis probability = 0.659
Photon flux (15-150 keV) in 0.2560 sec: 0.634932 ( -0.205744 0.205679 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62665e-09 ( -2.59297e-09 2.7019e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.338162 ( -3.71739 8.678436E-04) )
beta : -3.17997 ( -2.75719 4.69223 )
Epeak [keV] : 34.7117 ( -8.23479 4.38797 )
Norm@50keV : 0.146914 ( -239.667 616.145 )
------------------------------------------------------------
Chi-Squared = 53.71426 using 59 PHA bins.
Reduced chi-squared = 0.9766228 for 55 degrees of freedom
Null hypothesis probability = 0.524
Photon flux (15-150 keV) in 0.2560 sec: 0.640033 ( -0.221817 0.221852 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.57933e-09 ( -3.20566e-09 1.71366e-09 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84071 ( -0.595098 0.635607 )
Norm@50keV : 4.374767E-03 ( -1.935544E-03 1.903146E-03) )
------------------------------------------------------------
Chi-Squared = 57.42608 using 59 PHA bins.
Reduced chi-squared = 1.007475 for 57 degrees of freedom
Null hypothesis probability = 0.459
Photon flux (15-150 keV) in 0.2560 sec: 0.612971 ( -0.228232 0.228232 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03163e-08 ( -4.38556e-09 4.71736e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.48680 ( )
Epeak [keV] : 32.0532 ( -5.96484 7.24029 )
Norm@50keV : 4.49950 ( -10.1530 17.5543 )
------------------------------------------------------------
Chi-Squared = 51.13101 using 59 PHA bins.
Reduced chi-squared = 0.9130537 for 56 degrees of freedom
Null hypothesis probability = 0.659
Photon flux (15-150 keV) in 0.2560 sec: 0.634932 ( -0.205744 0.205679 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.62665e-09 ( -2.59297e-09 2.7019e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.256 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.338162 ( -3.72154 8.678436E-04) )
beta : -3.17997 ( -2.75719 4.69223 )
Epeak [keV] : 34.7117 ( -8.24291 4.38797 )
Norm@50keV : 0.146914 ( -239.667 616.145 )
------------------------------------------------------------
Chi-Squared = 53.71426 using 59 PHA bins.
Reduced chi-squared = 0.9766228 for 55 degrees of freedom
Null hypothesis probability = 0.524
Photon flux (15-150 keV) in 0.2560 sec: 0.640033 ( -0.221817 0.221852 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.57933e-09 ( -3.20566e-09 1.71366e-09 ) ergs/cm2
Plot creation:
Tue Oct 21 17:39:44 EDT 2008