batgrbproduct Analysis for Trigger=337914
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): Fri Aug 7 10:20:33 EDT 2009
Host Name: gcn14
Current Working Dir: /net/raid16/BAT_GRB_process_2009/337914
======================================================================
Trigger: 00337914 Segment: 000
BAT Trigger Time: 251614443.328 [s; MET]
Trigger Stop: 251614443.584 [s; MET]
UTC: 2008-12-22T04:53:59.974180 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 22.7514205034355 Dec: -34.1283751474552 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.08
Image Trigger?: NO
Rate S/N Ratio: 22.0454076850486 [ if not an image trigger ]
Image S/N Ratio: 8.08
Flight Position: [ source = BAT ]
RA: 22.7514205034355 Dec: -34.1283751474552 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 22.7485260197207 Dec: -34.094335836756 [deg; J2000]
{ 01h 30m 59.6s , -34d 05' 39.6" }
+/- 0.439602159503235 [arcmin] (estimated 90% radius based on SNR)
+/- 0.135194575727115 [arcmin] (formal 1-sigma fit error)
SNR: 98.4085713265079
Angular difference between Flight and Ground position is 2.047414 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 33 +/- 4
Measured from: 0.671999990940094
to: 33.6719999909401 [s; relative to TRIGTIME]
T50: 6 +/- 1
Measured from: 2.67199999094009
to: 8.67199999094009 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.67199999094009
to: 4.67199999094009 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.32800000905991
to: 63.6719999909401 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.132223 3.049748 2.520448 0.608099
0.041278 0.044379 0.040031 0.032145 [error]
Peak 0.211433 0.353157 0.334227 0.088667
0.007539 0.009080 0.008855 0.006119 [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 6.36e-07 1.23e-06 1.86e-06 6.06e-06 5.23e-06 9.79e-06 erg/cm2
Error 2.71e-08 3.01e-08 4.31e-08 3.34e-07 1.07e-07 3.51e-07 erg/cm2
Peak flux Power-law 1.91e+00 2.36e+00 2.12e+00 3.30e+00 7.52e+00 9.68e+00 ph/cm2/s
Error 8.67e-02 6.74e-02 6.78e-02 2.15e-01 1.97e-01 2.89e-01 ph/cm2/s
Fluence Cutoff-PL 6.00e-07 1.25e-06 1.90e-06 4.66e-06 5.16e-06 8.40e-06 erg/cm2
Error 3.65e-08 3.14e-08 5.02e-08 8.72e-07 1.18e-07 8.74e-07 erg/cm2
Peak flux Cutoff-PL 1.77e+00 2.46e+00 2.21e+00 2.06e+00 7.44e+00 8.50e+00 ph/cm2/s
Error 1.01e-01 8.10e-02 7.93e-02 3.81e-01 2.00e-01 4.12e-01 ph/cm2/s
Fluence Band 5.93e-07 1.24e-06 1.89e-06 4.64e-06 5.15e-06 8.43e-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 1.80e+00 2.46e+00 2.20e+00 2.11e+00 7.46e+00 1.03e+01 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 1.410 0.038 - - 8.34e-03 1.65e-04 43.990 57
CPL 1.198 0.155 218.4 219.4 1.03e-02 1.56e-03 38.320 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.154 0.043 - - 6.44e-02 1.71e-03 71.750 57
CPL 0.741 0.172 157.5 51.3 1.04e-01 2.01e-02 53.150 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: 26.560000 sec.
T50 in the 50-300 keV band: 4.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 65.000 -1.328 63.672
T90 33.000 0.672 33.672
T50 6.000 2.672 8.672
Peak 1.000 3.672 4.672
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
22.7485 -34.0943 0.0019 11.3 177.2 6.6018 98.4 TRIG_00337914
------------------------------------------
Foreground time interval of the image:
-1.328 9.773 (delta_t = 11.101 [sec])
Background time interval of the image:
-239.328 -1.328 (delta_t = 238.000 [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 -1.328 sec. to 63.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40956 ( -0.0383257 0.0382839 )
Norm@50keV : 8.33934E-03 ( -0.00016534 0.000165306 )
------------------------------------------------------------
# Chi-Squared = 43.99 using 59 PHA bins.
# Reduced chi-squared = 0.7718 for 57 degrees of freedom
# Null hypothesis probability = 8.965326e-01
Photon flux (15-150 keV) in 65 sec: 1.01780 ( -0.0228576 0.0229312 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.22759e-06 ( -1.07312e-07 1.07391e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.328 sec. to 63.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19806 ( -0.157494 0.152244 )
Epeak [keV] : 218.444 ( -68.4254 370.419 )
Norm@50keV : 1.03055E-02 ( -0.0014223 0.00170754 )
------------------------------------------------------------
# Chi-Squared = 38.32 using 59 PHA bins.
# Reduced chi-squared = 0.6842 for 56 degrees of freedom
# Null hypothesis probability = 9.658923e-01
Photon flux (15-150 keV) in 65 sec: 1.00005 ( -0.025756 0.0259 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16186e-06 ( -1.18293e-07 1.17949e-07 ) ergs/cm2
Band function
Time interval is from -1.328 sec. to 63.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19807 ( -0.712702 5.52825 )
beta : -2.83893 ( 2.87863 12.8785 )
Epeak [keV] : 218.428 ( -162.422 204.327 )
Norm@50keV : 1.03041E-02 ( -0.000864529 0.00114774 )
------------------------------------------------------------
# Chi-Squared = 38.32 using 59 PHA bins.
# Reduced chi-squared = 0.6967 for 55 degrees of freedom
# Null hypothesis probability = 9.574944e-01
Photon flux (15-150 keV) in 65 sec: 0.990023 ( -0.046562 0.037727 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.15352e-06 ( -1.17864e-07 1.17878e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.5130 ( )
R^2/D10^2 : 5.49939E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 496.02 using 59 PHA bins.
# Reduced chi-squared = 8.7020 for 57 degrees of freedom
# Null hypothesis probability = 2.701370e-71
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.430e-07 9.555e-09
25- 50 1.147e-06 3.348e-08
50-150 2.874e-06 9.847e-08
15-150 4.265e-06 9.263e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.984 ( )
Norm : 4.26557 (-0.0844966 0.0844966)
------------------------------------------------------------
# Chi-Squared = 101.74 using 59 PHA bins.
# Reduced chi-squared = 1.7850 for 57 degrees of freedom
# Null hypothesis probability = 2.485847e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.903e-07 3.484e-07
25- 50 1.328e-06 6.711e-07
50-150 2.912e-06 1.475e-06
15-150 4.931e-06 2.492e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.53662 (-0.610272 0.656328)
R1^2/D10^2 : 0.723976 (-0.179027 0.253254)
kT2 [keV] : 28.7768 (-1.88339 2.30954)
R2^2/D10^2 : 1.01936E-02 (-0.00243943 0.00281981)
------------------------------------------------------------
# Chi-Squared = 40.14 using 59 PHA bins.
# Reduced chi-squared = 0.7298 for 55 degrees of freedom
# Null hypothesis probability = 9.337673e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.487e-07 4.082e-08
25- 50 1.259e-06 5.395e-08
50-150 3.325e-06 1.479e-07
15-150 5.132e-06 1.914e-07
Peak spectrum fit
Power-law model
Time interval is from 3.672 sec. to 4.672 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15434 ( -0.0430124 0.0430198 )
Norm@50keV : 6.44168E-02 ( -0.00170789 0.00170701 )
------------------------------------------------------------
# Chi-Squared = 71.75 using 59 PHA bins.
# Reduced chi-squared = 1.259 for 57 degrees of freedom
# Null hypothesis probability = 9.029674e-02
Photon flux (15-150 keV) in 1 sec: 7.51620 ( -0.197484 0.197479 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.62269e-07 ( -2.05418e-08 2.05996e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.672 sec. to 4.672 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.740744 ( -0.175517 0.168676 )
Epeak [keV] : 157.527 ( -32.0964 70.4046 )
Norm@50keV : 0.103698 ( -0.0178216 0.0224577 )
------------------------------------------------------------
# Chi-Squared = 53.15 using 59 PHA bins.
# Reduced chi-squared = 0.9491 for 56 degrees of freedom
# Null hypothesis probability = 5.834875e-01
Photon flux (15-150 keV) in 1 sec: 7.43919 ( -0.20031 0.2002 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44939e-07 ( -2.2105e-08 2.2048e-08 ) ergs/cm2
Band function
Time interval is from 3.672 sec. to 4.672 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.741542 ( -0.166519 0.824784 )
beta : -1.81309 ( 1.82815 0.554012 )
Epeak [keV] : 157.208 ( -119.081 71.5929 )
Norm@50keV : 0.103689 ( -0.0184066 3.6878 )
------------------------------------------------------------
# Chi-Squared = 53.14 using 59 PHA bins.
# Reduced chi-squared = 0.9662 for 55 degrees of freedom
# Null hypothesis probability = 5.459265e-01
Photon flux (15-150 keV) in 1 sec: 7.45942 ( -0.24869 0.24891 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44827e-07 ( -2.3263e-08 2.3151e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.9509 ( )
R^2/D10^2 : 0.509419 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 308.07 using 59 PHA bins.
# Reduced chi-squared = 5.4048 for 57 degrees of freedom
# Null hypothesis probability = 3.876771e-36
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.289e-08 1.525e-09
25- 50 1.518e-07 5.150e-09
50-150 3.549e-07 1.615e-08
15-150 5.396e-07 1.835e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 29.7513 ( )
------------------------------------------------------------
# Chi-Squared = 261.62 using 59 PHA bins.
# Reduced chi-squared = 4.5898 for 57 degrees of freedom
# Null hypothesis probability = 5.507601e-28
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.408e-08 3.786e-08
25- 50 1.425e-07 7.280e-08
50-150 3.125e-07 1.592e-07
15-150 5.291e-07 2.702e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.55885 (-0.810776 0.888053)
R1^2/D10^2 : 4.44722 (-1.21538 1.82051)
kT2 [keV] : 28.8174 (-2.45741 3.19679)
R2^2/D10^2 : 9.02564E-02 (-0.0273332 0.0328803)
------------------------------------------------------------
# Chi-Squared = 51.59 using 59 PHA bins.
# Reduced chi-squared = 0.9379 for 55 degrees of freedom
# Null hypothesis probability = 6.058198e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.592e-08 4.895e-09
25- 50 1.423e-07 8.150e-09
50-150 4.489e-07 3.180e-08
15-150 6.471e-07 3.770e-08
Plot creation:
Tue Jul 26 11:02:31 EDT 2011