batgrbproduct Analysis for Trigger=323898
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 11:42:49 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/323898
======================================================================
Trigger: 00323898 Segment: 000
BAT Trigger Time: 242326548.48 [s; MET]
Trigger Stop: 242326550.528 [s; MET]
UTC: 2008-09-05T16:55:45.405420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 301.72269381416 Dec: -62.5711596742389 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.01
Image Trigger?: NO
Rate S/N Ratio: 15.7797338380595 [ if not an image trigger ]
Image S/N Ratio: 8.01
Flight Position: [ source = BAT ]
RA: 301.72269381416 Dec: -62.5711596742389 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 301.754462043636 Dec: -62.5736453044592 [deg; J2000]
{ 20h 07m 01.1s , -62d 34' 25.1" }
+/- 1.76470888316301 [arcmin] (estimated 90% radius based on SNR)
+/- 0.744326328279381 [arcmin] (formal 1-sigma fit error)
SNR: 13.5122688396375
Angular difference between Flight and Ground position is 0.890575 arcmin
Partial Coding Fraction: 0.3789062 [ including projection effects ]
Duration
T90: 101.624000012875 +/- 28.0583333245587
Measured from: 0.412000000476837
to: 102.036000013351 [s; relative to TRIGTIME]
T50: 77.863999992609 +/- 4.55790348152093
Measured from: 5.37600001692772
to: 83.2400000095367 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.45600000023842
to: 3.45600000023842 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.727999985218048
to: 149.692000001669 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.927499 1.140963 0.793249 0.163443
0.080698 0.080492 0.068641 0.058955 [error]
Peak 0.050906 0.059996 0.063534 0.016283
0.010245 0.010187 0.009243 0.007644 [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 3.34e-07 5.22e-07 6.15e-07 1.40e-06 1.88e-06 2.87e-06 erg/cm2
Error 4.42e-08 4.22e-08 6.76e-08 3.27e-07 1.60e-07 3.81e-07 erg/cm2
Peak flux Power-law 5.43e-01 5.51e-01 3.94e-01 4.49e-01 1.66e+00 1.94e+00 ph/cm2/s
Error 1.57e-01 9.59e-02 7.52e-02 1.82e-01 2.70e-01 3.00e-01 ph/cm2/s
Fluence Cutoff-PL 3.26e-07 5.30e-07 6.21e-07 1.13e-06 1.86e-06 2.61e-06 erg/cm2
Error 5.12e-08 4.96e-08 7.14e-08 5.97e-07 1.73e-07 6.28e-07 erg/cm2
Peak flux Cutoff-PL 5.42e-01 5.51e-01 3.94e-01 4.47e-01 1.66e+00 1.94e+00 ph/cm2/s
Error 1.62e-01 9.56e-02 7.50e-02 1.81e-01 2.69e-01 3.32e-01 ph/cm2/s
Fluence Band 2.76e-07 4.93e-07 6.05e-07 1.43e-06 1.79e-06 2.83e-06 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 5.15e-01 5.41e-01 4.03e-01 4.71e-01 1.67e+00 1.94e+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 1.763 0.142 - - 1.36e-03 1.12e-04 62.430 57
CPL 1.621 0.424 132.5 0.0 1.60e-03 0.00e+00 62.210 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.484 0.283 - - 1.34e-02 2.08e-03 75.090 57
CPL 1.490 0.285 9999.3 0.0 1.34e-02 9.05e-03 75.090 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: 86.528000 sec.
T50 in the 50-300 keV band: 69.760000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 150.420 -0.728 149.692
T90 101.624 0.412 102.036
T50 77.864 5.376 83.240
Peak 1.000 2.456 3.456
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
301.7545 -62.5736 0.0142 44.8 177.7 1.2741 13.5 TRIG_00323898
------------------------------------------
Foreground time interval of the image:
-0.728 25.221 (delta_t = 25.949 [sec])
Background time interval of the image:
-239.480 -0.728 (delta_t = 238.752 [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 -0.728 sec. to 149.692 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76348 ( -0.141064 0.143688 )
Norm@50keV : 1.35621E-03 ( -0.000112404 0.000111491 )
------------------------------------------------------------
# Chi-Squared = 62.43 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 57 degrees of freedom
# Null hypothesis probability = 2.894694e-01
Photon flux (15-150 keV) in 150.4 sec: 0.184303 ( -0.0151441 0.0152074 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88078e-06 ( -1.59692e-07 1.60549e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.728 sec. to 149.692 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.62137 ( -0.568767 0.279443 )
Epeak [keV] : 132.462 ( )
Norm@50keV : 1.60211E-03 ( )
------------------------------------------------------------
# Chi-Squared = 62.21 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 56 degrees of freedom
# Null hypothesis probability = 2.646908e-01
Photon flux (15-150 keV) in 150.4 sec: 0.182937 ( -0.015892 0.015848 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.86368e-06 ( -1.73592e-07 1.71787e-07 ) ergs/cm2
Band function
Time interval is from -0.728 sec. to 149.692 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.34931 ( 1.34713 6.34113 )
beta : -1.83878 ( 1.84552 0.2161 )
Epeak [keV] : 59.2176 ( -60.0396 -60.0396 )
Norm@50keV : 2.38083E-03 ( -0.000913409 0.104285 )
------------------------------------------------------------
# Chi-Squared = 62.17 using 59 PHA bins.
# Reduced chi-squared = 1.130 for 55 degrees of freedom
# Null hypothesis probability = 2.360364e-01
Photon flux (15-150 keV) in 150.4 sec: 0.168201 ( -0.014201 0.013517 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.78844e-06 ( -1.64222e-07 1.60086e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.1317 (-1.3327 1.50436)
R^2/D10^2 : 3.10722E-02 (-0.0102864 0.0152183)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 108.20 using 59 PHA bins.
# Reduced chi-squared = 1.8982 for 57 degrees of freedom
# Null hypothesis probability = 5.046394e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.709e-07 2.655e-08
25- 50 5.950e-07 6.700e-08
50-150 6.524e-07 1.123e-07
15-150 1.418e-06 1.441e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 122.597 (-11.2498 79.2749)
Norm : 0.775579 (-0.0799925 0.0936557)
------------------------------------------------------------
# Chi-Squared = 63.22 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.661286e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.036e-07 3.677e-08
25- 50 5.451e-07 4.813e-08
50-150 9.829e-07 1.444e-07
15-150 1.832e-06 1.775e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.92613 (-1.59304 1.62427)
R1^2/D10^2 : 0.231510 (-0.118694 0.434411)
kT2 [keV] : 26.0340 (-5.94572 11.2347)
R2^2/D10^2 : 1.90379E-03 (-0.00135396 0.00327929)
------------------------------------------------------------
# Chi-Squared = 63.96 using 59 PHA bins.
# Reduced chi-squared = 1.163 for 55 degrees of freedom
# Null hypothesis probability = 1.909740e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.983e-07 9.607e-08
25- 50 5.469e-07 1.462e-07
50-150 1.010e-06 4.908e-07
15-150 1.855e-06 6.057e-07
Peak spectrum fit
Power-law model
Time interval is from 2.456 sec. to 3.456 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48421 ( -0.280705 0.285798 )
Norm@50keV : 1.33869E-02 ( -0.002081 0.00207261 )
------------------------------------------------------------
# Chi-Squared = 75.09 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.447518e-02
Photon flux (15-150 keV) in 1 sec: 1.66421 ( -0.269276 0.270165 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27329e-07 ( -2.13621e-08 2.14734e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.456 sec. to 3.456 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48958 ( -0.290586 0.279955 )
Epeak [keV] : 9999.32 ( -9984.05 -9984.05 )
Norm@50keV : 1.33805E-02 ( -0.00208394 0.0160119 )
------------------------------------------------------------
# Chi-Squared = 75.09 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 56 degrees of freedom
# Null hypothesis probability = 4.515958e-02
Photon flux (15-150 keV) in 1 sec: 1.66352 ( -0.26866 0.26984 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27313e-07 ( -2.1226e-08 2.1513e-08 ) ergs/cm2
Band function
Time interval is from 2.456 sec. to 3.456 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25124 ( 1.25124 1.25124 )
beta : -1.48418 ( -0.285458 0.281109 )
Epeak [keV] : 19.9011 ( -19.8981 -19.8981 )
Norm@50keV : 2.74893E-02 ( -0.0139759 2.07367 )
------------------------------------------------------------
# Chi-Squared = 75.09 using 59 PHA bins.
# Reduced chi-squared = 1.365 for 55 degrees of freedom
# Null hypothesis probability = 3.724646e-02
Photon flux (15-150 keV) in 1 sec: 1.66577 ( -0.25506 0.2579 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26819e-07 ( -1.9476e-08 2.2856e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.9149 (-3.56909 4.61916)
R^2/D10^2 : 0.100269 (-0.0545688 0.116093)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 90.34 using 59 PHA bins.
# Reduced chi-squared = 1.585 for 57 degrees of freedom
# Null hypothesis probability = 3.238250e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.453e-09 2.174e-09
25- 50 2.974e-08 8.675e-09
50-150 6.919e-08 1.988e-08
15-150 1.054e-07 2.720e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.359 (-78.4524 -199.768)
Norm : 6.83424 (-1.05452 1.05723)
------------------------------------------------------------
# Chi-Squared = 76.41 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 57 degrees of freedom
# Null hypothesis probability = 4.400003e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.702e-08 9.300e-09
25- 50 3.274e-08 1.793e-08
50-150 7.180e-08 3.938e-08
15-150 1.215e-07 6.550e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.70028 (-2.1687 4.93036)
R1^2/D10^2 : 153.613 (-150.221 -151.451)
kT2 [keV] : 21.8162 (-5.12078 14.638)
R2^2/D10^2 : 4.80386E-02 (-0.0398414 0.0748355)
------------------------------------------------------------
# Chi-Squared = 74.93 using 59 PHA bins.
# Reduced chi-squared = 1.362 for 55 degrees of freedom
# Null hypothesis probability = 3.824766e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.873e-08 9.825e-09
25- 50 2.379e-08 9.842e-09
50-150 7.945e-08 3.031e-08
15-150 1.220e-07 3.555e-08
Plot creation:
Thu Jul 28 10:57:09 EDT 2011