batgrbproduct Analysis for Trigger=579975
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 v2.46
Process Start Time (local time): Tue Dec 3 00:58:00 EST 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger579975/GCN5_download_cron
======================================================================
Trigger: 00579975 Segment: 000
BAT Trigger Time: 407680852.16 [s; MET]
Trigger Stop: 407680879.04 [s; MET]
UTC: 2013-12-02T12:40:40.815480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 135.534765799951 Dec: -40.5484264962477 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 12.64
Image Trigger?: NO
Rate S/N Ratio: 21.0237960416286 [ if not an image trigger ]
Image S/N Ratio: 12.64
Flight Position: [ source = BAT ]
RA: 135.534765799951 Dec: -40.5484264962477 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 135.511268545661 Dec: -40.5464586027789 [deg; J2000]
{ 09h 02m 02.7s , -40d 32' 47.3" }
+/- nan [arcmin] (estimated 90% radius based on SNR)
+/- 2.00763783940389 [arcmin] (formal 1-sigma fit error)
SNR: -5.52696600072103
Angular difference between Flight and Ground position is 1.077776 arcmin
Partial Coding Fraction: 0.8828125 [ including projection effects ]
Duration
T90: 180.864000022411 +/- 24.5952632898146
Measured from: -96.2479999065399
to: 84.6160001158714 [s; relative to TRIGTIME]
T50: 119.615999996662 +/- 89.1437124565249
Measured from: -64.5039998888969
to: 55.1120001077652 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 20.0199999809265
to: 21.0199999809265 [s; relative to TRIGTIME]
Total Fluence
Measured from: -101.304000020027
to: 94.472000002861 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.534432 1.660580 0.014125 0.023649
0.081414 0.081555 0.069075 0.060363 [error]
Peak 0.037280 0.024146 0.003085 0.005487
0.006147 0.006013 0.004947 0.004375 [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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 Power-law 3.30e-01 1.72e-01 5.56e-02 2.31e-02 5.70e-01 5.81e-01 ph/cm2/s
Error 9.03e-02 5.08e-02 3.20e-02 2.78e-02 1.40e-01 1.45e-01 ph/cm2/s
Fluence Cutoff-PL 7.73e-07 7.04e-07 3.97e-08 1.67e-11 1.52e-06 1.52e-06 erg/cm2
Error 7.38e-08 5.95e-08 2.30e-08 7.61e-11 1.03e-07 1.03e-07 erg/cm2
Peak flux Cutoff-PL 3.43e-01 2.06e-01 6.41e-03 1.06e-06 5.55e-01 5.55e-01 ph/cm2/s
Error 1.03e-01 7.67e-02 2.11e-02 1.22e-03 1.29e-01 1.29e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 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 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+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 3.113 0.000 - - 7.33e-04 0.00e+00 140.890 57
CPL 1.000 0.000 50.0 0.0 3.23e-03 0.00e+00 375.710 56
The chi2 of BB fit is 61.46 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.630 0.542 - - 2.68e-03 1.20e-03 69.940 57
CPL -3.312 0.782 24.1 4.0 5.97e+01 0.00e+00 65.490 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 195.776 -101.304 94.472
T90 180.864 -96.248 84.616
T50 119.616 -64.504 55.112
Peak 1.000 20.020 21.020
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
135.5113 -40.5465 0.0346 22.5 166.1 -2.4248 -5.5 TRIG_00579975
------------------------------------------
Foreground time interval of the image:
-101.304 69.241 (delta_t = 170.545 [sec])
Background time interval of the image:
-119.160 -101.304 (delta_t = 17.856 [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 -101.304 sec. to 94.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.11275 ( )
Norm@50keV : 7.32795E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 140.89 using 59 PHA bins.
# Reduced chi-squared = 2.4717 for 57 degrees of freedom
# Null hypothesis probability = 4.707803e-09
Photon flux (15-150 keV) in 195.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -101.304 sec. to 94.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.23029E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 375.71 using 59 PHA bins.
# Reduced chi-squared = 6.7091 for 56 degrees of freedom
# Null hypothesis probability = 6.896143e-49
Photon flux (15-150 keV) in 195.8 sec: 0.199106 ( -0.014168 0.014106 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51719e-06 ( -1.0258e-07 1.03989e-07 ) ergs/cm2
Band function
Time interval is from -101.304 sec. to 94.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.75511 ( )
beta : -9.06266 ( )
Epeak [keV] : 14.3589 ( )
Norm@50keV : 3.16629E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 238.71 using 59 PHA bins.
# Reduced chi-squared = 4.3402 for 55 degrees of freedom
# Null hypothesis probability = 9.748777e-25
Photon flux (15-150 keV) in 195.8 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.69592 (-0.286042 0.301967)
R^2/D10^2 : 1.01555 (-0.22404 0.289309)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.193361e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.924e-07 7.313e-08
25- 50 7.041e-07 6.412e-08
50-150 5.184e-08 1.466e-08
15-150 1.548e-06 1.066e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 17.0917 (-1.65594 1.89518)
Norm : 3.26786 (-0.479602 0.570951)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.95 using 59 PHA bins.
# Reduced chi-squared = 1.578 for 57 degrees of freedom
# Null hypothesis probability = 3.511422e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.575e-07 6.951e-08
25- 50 6.597e-07 5.326e-08
50-150 1.497e-07 3.891e-08
15-150 1.667e-06 1.144e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.03166E-04 ( )
R1^2/D10^2 : 5.56562 (-5.56562 -5.56562)
kT2 [keV] : 5.69593 (-0.286042 0.301966)
R2^2/D10^2 : 1.01555 (-0.22404 0.28931)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.48 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.46 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 55 degrees of freedom
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Null hypothesis probability = 2.552524e-01
# Null hypothesis probability = 2.557394e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.915e-07 1.512e-01
25- 50 7.051e-07 1.351e+00
50-150 5.233e-08 3.236e+01
15-150 1.549e-06 3.405e+01
Peak spectrum fit
Power-law model
Time interval is from 20.020 sec. to 21.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62960 ( -0.488368 0.596388 )
Norm@50keV : 2.67617E-03 ( -0.00116131 0.00123076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.94 using 59 PHA bins.
# Reduced chi-squared = 1.227 for 57 degrees of freedom
# Null hypothesis probability = 1.166451e-01
Photon flux (15-150 keV) in 1 sec: 0.570394 ( -0.13947 0.139943 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.78053e-08 ( -8.5141e-09 9.43012e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 20.020 sec. to 21.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.31185 ( 2.07398 3.63764 )
Epeak [keV] : 24.1027 ( -2.92704 5.05338 )
Norm@50keV : 59.6669 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 56 degrees of freedom
# Null hypothesis probability = 1.806080e-01
Photon flux (15-150 keV) in 1 sec: 0.555227 ( -0.130303 0.127778 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.18815e-08 ( -5.5689e-09 6.2325e-09 ) ergs/cm2
Band function
Time interval is from 20.020 sec. to 21.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -4.86406 ( 2.24203 4.86406 )
beta : -2.62946 ( -0.596058 0.48809 )
Epeak [keV] : 56.3060 ( -56.306 -56.306 )
Norm@50keV : 0.363768 ( -0.157851 0.167267 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.94 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 55 degrees of freedom
# Null hypothesis probability = 8.459393e-02
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 5.98186 (-1.15298 1.37943)
R^2/D10^2 : 2.26921 (-1.35166 3.47732)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.72 using 59 PHA bins.
# Reduced chi-squared = 1.153 for 57 degrees of freedom
# Null hypothesis probability = 2.002952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.074e-08 4.868e-09
25- 50 1.064e-08 6.027e-09
50-150 9.625e-10 7.520e-10
15-150 2.235e-08 1.304e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 22.3228 (-8.54466 17.2327)
Norm : 6.19991 (-2.64173 5.00075)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.05 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.499748e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.049e-08 4.232e-09
25- 50 9.966e-09 4.874e-09
50-150 3.568e-09 3.173e-09
15-150 2.403e-08 9.901e-09
Double BB
R1^2/D10^2 : 3.24621E-05 ( )
kT2 [keV] : 5.83150 (-1.19926 1.32932)
R2^2/D10^2 : 2.48488 (-1.47363 4.15922)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.73 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.94 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.60 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Reduced chi-squared = 1.181 for 55 degrees of freedom
# Reduced chi-squared = 1.175 for 55 degrees of freedom
# Null hypothesis probability = 1.525502e-01
# Null hypothesis probability = 1.688631e-01
# Null hypothesis probability = 1.761754e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.071e-08 1.125e-02
25- 50 1.070e-08 8.790e-02
50-150 9.858e-10 2.281e+00
15-150 2.240e-08 2.126e+00
Plot creation:
Tue Dec 3 01:08:33 EST 2013