batgrbproduct Analysis for Trigger=339131
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 v2.42
Process Start Time (local time): Sun Jan 4 16:07:27 EST 2009
Host Name: gcn5
Current Working Dir: /local/data/raid2/prebascript/trigger339131/GCN5_download_cron
======================================================================
Trigger: 00339131 Segment: 000
BAT Trigger Time: 252733960 [s; MET]
Trigger Stop: 252734472 [s; MET]
UTC: 2009-01-04T03:52:35.612080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 170.29909863048 Dec: -61.9130042604188 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.87
Flight Position: [ source = BAT ]
RA: 170.29909863048 Dec: -61.9130042604188 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 170.277427972093 Dec: -61.9690958730143 [deg; J2000]
{ 11h 21m 06.6s , -61d 58' 08.7" }
+/- 3.31948467301537 [arcmin] (estimated 90% radius based on SNR)
+/- 2.40198714007573 [arcmin] (formal 1-sigma fit error)
SNR: 5.47938367910218
Angular difference between Flight and Ground position is 3.420618 arcmin
Partial Coding Fraction: 0.953125 [ including projection effects ]
Duration
T90: 512 +/-
Measured from: 0
to: 512 [s; relative to TRIGTIME]
T50: 512 +/-
Measured from: 0
to: 512 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 512 second)
Measured from: 0
to: 512 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 512 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.147802 0.804588 -0.003109 0.024246
0.123944 0.125569 0.119378 0.127230 [error]
Peak 1.147802 0.804588 -0.003109 0.024246
0.123944 0.125569 0.119378 0.127230 [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 3.50e-07 2.85e-07 1.57e-07 1.27e-07 8.50e-07 9.19e-07 erg/cm2
Error 5.93e-08 6.32e-08 7.00e-08 1.02e-07 1.82e-07 2.37e-07 erg/cm2
Peak flux Power-law 2.27e-02 1.04e-02 2.86e-03 9.83e-04 3.65e-02 3.69e-02 ph/cm2/s
Error 3.92e-03 2.20e-03 1.23e-03 9.57e-04 5.88e-03 6.03e-03 ph/cm2/s
Fluence Cutoff-PL 3.57e-07 3.29e-07 2.60e-08 3.37e-11 7.12e-07 7.12e-07 erg/cm2
Error 6.63e-08 8.83e-08 4.99e-08 3.53e-09 1.35e-07 1.35e-07 erg/cm2
Peak flux Cutoff-PL 2.24e-02 1.24e-02 5.55e-04 3.83e-07 3.54e-02 3.54e-02 ph/cm2/s
Error 4.34e-03 3.06e-03 1.05e-03 3.71e-05 5.56e-03 5.56e-03 ph/cm2/s
Fluence Band 3.54e-07 3.31e-07 3.29e-08 2.75e-10 7.13e-07 7.69e-07 erg/cm2
Error 6.39e-08 8.28e-08 2.47e-08 3.02e-10 1.18e-07 0.00e+00 erg/cm2
Peak flux Band 2.27e-02 1.21e-02 1.54e-03 3.09e-05 3.64e-02 3.64e-02 ph/cm2/s
Error 3.47e-03 2.41e-03 7.09e-04 3.66e-04 5.53e-03 5.55e-03 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.829 0.385 - - 1.50e-04 4.96e-05 63.243 57
CPL -0.916 0.000 21.9 3.0 7.36e-02 0.00e+00 54.643 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.829 0.385 - - 1.50e-04 4.96e-05 63.243 57
CPL -0.916 0.000 21.9 3.0 7.36e-02 0.00e+00 54.643 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 512.000 0.000 512.000
T90 512.000 0.000 512.000
T50 512.000 0.000 512.000
Peak 512.000 0.000 512.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
170.2774 -61.9691 0.0351 20.9 176.9 2.0119 5.5 TRIG_00339131
------------------------------------------
Foreground time interval of the image:
0.000 512.000 (delta_t = 512.000 [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.
- 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 512.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82905 ( -0.325383 0.444054 )
Norm@50keV : 1.503727E-04 ( -5.123829E-05 4.796537E-05) )
------------------------------------------------------------
Chi-Squared = 63.24257 using 59 PHA bins.
Reduced chi-squared = 1.109519 for 57 degrees of freedom
Null hypothesis probability = 0.265
Photon flux (15-150 keV) in 512.0 sec: 3.652554E-02 ( -0.00586402 0.00589261 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.49516e-07 ( -1.74177e-07 1.89911e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 512.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.916320 ( )
Epeak [keV] : 21.8616 ( -2.84668 3.17656 )
Norm@50keV : 7.363704E-02 ( )
------------------------------------------------------------
Chi-Squared = 54.64339 using 59 PHA bins.
Reduced chi-squared = 0.9757748 for 56 degrees of freedom
Null hypothesis probability = 0.526
Photon flux (15-150 keV) in 512.0 sec: 3.544348E-02 ( -0.00551173 0.00560382 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11916e-07 ( -1.24022e-07 1.45664e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 512.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33131 ( -0.540308 0.644845 )
beta : -9.36474 ( -0.635262 19.3647 )
Epeak [keV] : 13.1171 ( -10.0653 3.20692 )
Norm@50keV : 1.737645E-03 ( -0.269598 29.0092 )
------------------------------------------------------------
Chi-Squared = 57.29034 using 59 PHA bins.
Reduced chi-squared = 1.041643 for 55 degrees of freedom
Null hypothesis probability = 0.390
Photon flux (15-150 keV) in 512.0 sec: 3.637007E-02 ( -0.00552649 0.00553455 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.13037e-07 ( -1.23546e-07 1.11514e-07 ) ergs/cm2
Peak spectrum fit using the pre-slew DRM
Power-law model
Time interval is from 0.000 sec. to 512.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.82905 ( -0.325383 0.444054 )
Norm@50keV : 1.503727E-04 ( -5.123829E-05 4.796537E-05) )
------------------------------------------------------------
Chi-Squared = 63.24257 using 59 PHA bins.
Reduced chi-squared = 1.109519 for 57 degrees of freedom
Null hypothesis probability = 0.265
Photon flux (15-150 keV) in 512.0 sec: 3.652554E-02 ( -0.00586402 0.00589261 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.49516e-07 ( -1.74177e-07 1.89911e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 512.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.916320 ( )
Epeak [keV] : 21.8616 ( -2.84668 3.17656 )
Norm@50keV : 7.363704E-02 ( )
------------------------------------------------------------
Chi-Squared = 54.64339 using 59 PHA bins.
Reduced chi-squared = 0.9757748 for 56 degrees of freedom
Null hypothesis probability = 0.526
Photon flux (15-150 keV) in 512.0 sec: 3.544348E-02 ( -0.00551173 0.00560382 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.11916e-07 ( -1.24022e-07 1.45664e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 512.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.33131 ( -0.540308 0.644845 )
beta : -9.36474 ( -0.635262 6.34118 )
Epeak [keV] : 13.1171 ( -10.0653 3.20692 )
Norm@50keV : 1.737645E-03 ( -0.269598 29.0092 )
------------------------------------------------------------
Chi-Squared = 57.29034 using 59 PHA bins.
Reduced chi-squared = 1.041643 for 55 degrees of freedom
Null hypothesis probability = 0.390
Photon flux (15-150 keV) in 512.0 sec: 3.637007E-02 ( -0.00552649 0.00553455 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.13037e-07 ( -1.23546e-07 1.11514e-07 ) ergs/cm2
Plot creation:
Sun Jan 4 16:35:41 EST 2009