batgrbproduct Analysis for Trigger=323870
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 batgrbproduct analysis is using the flight position for the mask-weighting calculation.
- 4) This page will be updated for up to 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Thu Aug 6 11:17:53 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/323870
======================================================================
Trigger: 00323870 Segment: 000
BAT Trigger Time: 242308738.048 [s; MET]
Trigger Stop: 242308738.304 [s; MET]
UTC: 2008-09-05T11:58:54.973940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 287.661676067797 Dec: -18.8772722987606 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.87
Image Trigger?: NO
Rate S/N Ratio: 29.0344622819159 [ if not an image trigger ]
Image S/N Ratio: 6.87
Flight Position: [ source = BAT ]
RA: 287.661676067797 Dec: -18.8772722987606 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 287.667070250673 Dec: -18.8666914499791 [deg; J2000]
{ 19h 10m 40.1s , -18d 52' 00.1" }
+/- 2.08490420128634 [arcmin] (estimated 90% radius based on SNR)
+/- 0.764992115125948 [arcmin] (formal 1-sigma fit error)
SNR: 10.6483198509038
Angular difference between Flight and Ground position is 0.704859 arcmin
Partial Coding Fraction: 0.5625 [ including projection effects ]
Duration
T90: 1.01600003242493 +/- 0.0815843255901954
Measured from: 0.0479999780654907
to: 1.06400001049042 [s; relative to TRIGTIME]
T50: 0.768000036478043 +/- 0.120000004768375
Measured from: 0.179999977350235
to: 0.948000013828278 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0399999916553497
to: 1.03999999165535 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0399999916553497
to: 1.12799999117851 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.011610 0.062965 0.065322 0.036225
0.007346 0.008028 0.007953 0.007170 [error]
Peak 0.009954 0.056345 0.058198 0.034752
0.007015 0.007665 0.007648 0.006936 [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 7.96e-09 2.26e-08 5.21e-08 3.24e-07 1.41e-07 4.07e-07 erg/cm2
Error 2.49e-09 4.25e-09 6.99e-09 1.04e-07 1.91e-08 1.06e-07 erg/cm2
Peak flux Power-law 2.14e-01 3.40e-01 4.08e-01 9.52e-01 1.24e+00 1.91e+00 ph/cm2/s
Error 7.37e-02 7.20e-02 5.64e-02 2.93e-01 1.85e-01 3.00e-01 ph/cm2/s
Fluence Cutoff-PL 7.60e-09 2.28e-08 5.33e-08 2.63e-07 1.40e-07 3.46e-07 erg/cm2
Error 2.92e-09 4.48e-09 8.63e-09 2.17e-07 1.95e-08 1.69e-07 erg/cm2
Peak flux Cutoff-PL 2.08e-01 3.41e-01 4.13e-01 8.67e-01 1.23e+00 1.83e+00 ph/cm2/s
Error 8.50e-02 7.39e-02 6.93e-02 1.87e-01 4.60e-01 0.00e+00 ph/cm2/s
Fluence Band 7.54e-09 2.27e-08 5.32e-08 2.63e-07 1.40e-07 3.30e-07 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 1.55e-01 3.73e-01 4.17e-01 8.70e-01 1.21e+00 1.80e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.795 0.242 - - 1.10e-02 1.61e-03 50.300 57
CPL 0.627 0.830 499.3 0.0 1.30e-02 1.19e-02 50.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.739 0.259 - - 1.07e-02 1.69e-03 49.630 57
CPL 0.641 0.703 855.8 0.0 1.18e-02 1.08e-02 49.600 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: 1.024000 sec.
T50 in the 50-300 keV band: 0.832000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.088 0.040 1.128
T90 1.016 0.048 1.064
T50 0.768 0.180 0.948
Peak 1.000 0.040 1.040
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
287.6671 -18.8667 0.0181 39.6 -6.5 0.1762 10.6 TRIG_00323870
------------------------------------------
Foreground time interval of the image:
0.040 1.128 (delta_t = 1.088 [sec])
Background time interval of the image:
-749.147 -701.951 (delta_t = 47.196 [sec])
-239.048 0.040 (delta_t = 239.088 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) The mask-weighted light curves are using the flight position.
- 3) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 4) 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.
- 5) 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.
- 6) 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 0.040 sec. to 1.128 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.794893 ( -0.250696 0.232787 )
Norm@50keV : 1.10397E-02 ( -0.00162857 0.00158854 )
------------------------------------------------------------
# Chi-Squared = 50.30 using 59 PHA bins.
# Reduced chi-squared = 0.8825 for 57 degrees of freedom
# Null hypothesis probability = 7.226037e-01
Photon flux (15-150 keV) in 1.088 sec: 1.26907 ( -0.1791 0.180251 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40664e-07 ( -1.90668e-08 1.91138e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.040 sec. to 1.128 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.626821 ( -1.03686 0.623252 )
Epeak [keV] : 499.275 ( -500.137 -500.137 )
Norm@50keV : 1.29966E-02 ( -0.00309095 0.0207787 )
------------------------------------------------------------
# Chi-Squared = 50.20 using 59 PHA bins.
# Reduced chi-squared = 0.8964 for 56 degrees of freedom
# Null hypothesis probability = 6.930455e-01
Photon flux (15-150 keV) in 1.088 sec: 1.26276 ( -0.18128 0.18296 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40128e-07 ( -1.96721e-08 1.93762e-08 ) ergs/cm2
Band function
Time interval is from 0.040 sec. to 1.128 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.744964 ( 0.744964 0.744964 )
beta : -0.794893 ( -0.232502 0.250696 )
Epeak [keV] : 15.7907 ( -15.7907 -15.7907 )
Norm@50keV : 1.63120E-02 ( -0.00684467 0 )
------------------------------------------------------------
# Chi-Squared = 50.30 using 59 PHA bins.
# Reduced chi-squared = 0.9146 for 55 degrees of freedom
# Null hypothesis probability = 6.544155e-01
Photon flux (15-150 keV) in 1.088 sec: 1.23574 ( -0.08899 0.16914 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4004e-07 ( -1.96547e-08 1.93686e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.2349 (-4.68402 6.61428)
R^2/D10^2 : 2.79009E-02 (-0.0135686 0.0232666)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 58.43 using 59 PHA bins.
# Reduced chi-squared = 1.025 for 57 degrees of freedom
# Null hypothesis probability = 4.227844e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.536e-09 1.139e-09
25- 50 2.054e-08 5.173e-09
50-150 1.040e-07 2.415e-08
15-150 1.281e-07 2.994e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 5.22823 (-5.22823 -5.22823)
------------------------------------------------------------
# Chi-Squared = 78.92 using 59 PHA bins.
# Reduced chi-squared = 1.385 for 57 degrees of freedom
# Null hypothesis probability = 2.890946e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.416e-08 7.839e-09
25- 50 2.724e-08 1.501e-08
50-150 5.975e-08 3.273e-08
15-150 1.012e-07 5.620e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.9498 (-4.76297 6.14934)
R1^2/D10^2 : 0.160525 ( )
kT2 [keV] : 91.2887 (-57.5192 -92.9555)
R2^2/D10^2 : 9.39710E-04 (-0.000660394 0.00844727)
------------------------------------------------------------
# Chi-Squared = 47.87 using 59 PHA bins.
# Chi-Squared = 47.37 using 59 PHA bins.
# Reduced chi-squared = 0.8704 for 55 degrees of freedom
# Reduced chi-squared = 0.8613 for 55 degrees of freedom
# Null hypothesis probability = 7.411578e-01
# Null hypothesis probability = 7.578704e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.924e-09 4.134e-09
25- 50 2.511e-08 1.438e-08
50-150 1.037e-07 5.340e-08
15-150 1.358e-07 6.925e-08
Peak spectrum fit
Power-law model
Time interval is from 0.040 sec. to 1.040 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.739012 ( -0.270077 0.247766 )
Norm@50keV : 1.07278E-02 ( -0.00171364 0.00166078 )
------------------------------------------------------------
# Chi-Squared = 49.63 using 59 PHA bins.
# Reduced chi-squared = 0.8707 for 57 degrees of freedom
# Null hypothesis probability = 7.452335e-01
Photon flux (15-150 keV) in 1 sec: 1.23663 ( -0.184518 0.185853 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28694e-07 ( -1.82875e-08 1.83229e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.040 sec. to 1.040 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.640540 ( -1.08102 0.325195 )
Epeak [keV] : 855.799 ( -875.766 -875.766 )
Norm@50keV : 1.17864E-02 ( -0.00219775 0.0194741 )
------------------------------------------------------------
# Chi-Squared = 49.60 using 59 PHA bins.
# Reduced chi-squared = 0.8857 for 56 degrees of freedom
# Null hypothesis probability = 7.143376e-01
Photon flux (15-150 keV) in 1 sec: 1.23336 ( -0.18636 0.18712 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.28339e-07 ( 9.297e-09 -1.28339e-07 ) ergs/cm2
Band function
Time interval is from 0.040 sec. to 1.040 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.684356 ( 0.684356 0.684356 )
beta : -0.739013 ( -0.247775 0.270035 )
Epeak [keV] : 21.7313 ( -21.7313 -21.7313 )
Norm@50keV : 1.44431E-02 ( -0.00527452 0 )
------------------------------------------------------------
# Chi-Squared = 49.63 using 59 PHA bins.
# Reduced chi-squared = 0.9023 for 55 degrees of freedom
# Null hypothesis probability = 6.793253e-01
Photon flux (15-150 keV) in 1 sec: 1.20908 ( -0.18221 0.16536 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27305e-07 ( -1.749e-08 1.7353e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.7815 (-5.35776 7.91069)
R^2/D10^2 : 2.32653E-02 (-0.0119644 0.0212926)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 57.22 using 59 PHA bins.
# Reduced chi-squared = 1.004 for 57 degrees of freedom
# Null hypothesis probability = 4.668406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.941e-09 1.022e-09
25- 50 1.755e-08 4.530e-09
50-150 9.822e-08 2.349e-08
15-150 1.187e-07 2.858e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 5.05647 (-5.05647 -5.05647)
------------------------------------------------------------
# Chi-Squared = 78.91 using 59 PHA bins.
# Reduced chi-squared = 1.384 for 57 degrees of freedom
# Null hypothesis probability = 2.894457e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.259e-08 6.915e-09
25- 50 2.422e-08 1.352e-08
50-150 5.311e-08 2.882e-08
15-150 8.992e-08 4.856e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.9610 (-4.7154 6.44139)
R1^2/D10^2 : 0.176096 (-0.101089 0.237038)
kT2 [keV] : 63.6827 (-58.9317 -95.7277)
R2^2/D10^2 : 1.97310E-03 (-0.000725845 0.00778017)
------------------------------------------------------------
# Chi-Squared = 47.22 using 59 PHA bins.
# Reduced chi-squared = 0.8586 for 55 degrees of freedom
# Null hypothesis probability = 7.628349e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.046e-09 3.555e-09
25- 50 2.215e-08 1.238e-08
50-150 9.638e-08 5.080e-08
15-150 1.246e-07 6.340e-08
Plot creation:
Thu Jul 28 11:08:40 EDT 2011