batgrbproduct Analysis for Trigger=575887
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): Sat Oct 26 15:26:59 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger575887/GCN5_download_cron
======================================================================
Trigger: 00575887 Segment: 000
BAT Trigger Time: 404441776 [s; MET]
Trigger Stop: 404441840 [s; MET]
UTC: 2013-10-26T00:56:04.804840 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 244.936151936891 Dec: -15.6963837179423 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 20.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 20.55
Flight Position: [ source = BAT ]
RA: 244.936151936891 Dec: -15.6963837179423 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.975922658009 Dec: -15.6404093912196 [deg; J2000]
{ 16h 19m 54.2s , -15d 38' 25.5" }
+/- 0.58370425658642 [arcmin] (estimated 90% radius based on SNR)
+/- 0.120387313139811 [arcmin] (formal 1-sigma fit error)
SNR: 65.6339556833223
Angular difference between Flight and Ground position is 4.069163 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 376.327999949455 +/- 9.47179223427763
Measured from: -91.2879998683929
to: 285.040000081062 [s; relative to TRIGTIME]
T50: 217.263999938965 +/- 6.94425256287691
Measured from: -16.6119998693466
to: 200.652000069618 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -68.2319999933243
to: -67.2319999933243 [s; relative to TRIGTIME]
Total Fluence
Measured from: -120.079999983311
to: 307.660000026226 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 23.802741 2.056382 0.068759 -0.229794
0.153578 0.131321 0.113433 0.106292 [error]
Peak 0.078561 0.017684 0.006875 0.001363
0.007114 0.005860 0.005131 0.004780 [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 8.64e-06 8.99e-07 3.85e-08 1.71e-09 9.58e-06 9.58e-06 erg/cm2
Error 6.62e-07 7.52e-08 8.87e-09 6.85e-10 6.51e-07 6.51e-07 erg/cm2
Peak flux Power-law 8.33e-01 1.45e-01 1.21e-02 1.08e-03 9.91e-01 9.91e-01 ph/cm2/s
Error 1.53e-01 6.24e-02 1.26e-02 2.32e-03 1.75e-01 1.75e-01 ph/cm2/s
Fluence Cutoff-PL 8.04e-06 7.04e-07 5.40e-10 9.83e-17 8.74e-06 8.74e-06 erg/cm2
Error 7.99e-07 8.77e-08 1.20e-09 1.83e-14 8.04e-07 8.04e-07 erg/cm2
Peak flux Cutoff-PL 8.35e-01 1.42e-01 1.14e-02 9.91e-04 9.88e-01 9.88e-01 ph/cm2/s
Error 1.52e-01 6.26e-02 1.45e-02 1.80e-03 1.74e-01 1.76e-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 6.41e-01 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 6.547 0.227 - - 1.09e-04 2.05e-05 86.870 57
CPL 1.000 0.000 50.0 0.0 1.75e-03 0.00e+00 871.880 56
The chi2 of BB fit is 60.27 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 4.590 0.846 - - 9.44e-04 7.80e-04 46.320 57
CPL 1.000 0.000 50.0 0.0 1.26e-02 0.00e+00 95.330 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 427.740 -120.080 307.660
T90 376.328 -91.288 285.040
T50 217.264 -16.612 200.652
Peak 1.000 -68.232 -67.232
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9759 -15.6404 0.0029 26.7 -37.1 22.2646 65.6 TRIG_00575887
------------------------------------------
Foreground time interval of the image:
-18.799 165.030 (delta_t = 183.829 [sec])
166.000 220.820 (delta_t = 54.820 [sec])
222.000 307.660 (delta_t = 85.660 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
-120.080000 -114.150000
-113.000000 -112.993700
-112.000000 -107.320000
-106.000000 -99.220000
-98.000000 -95.320000
-94.000000 -92.680000
-92.000000 165.030000
166.000000 220.820000
222.000000 307.660000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.54651 ( -0.22839 0.226268 )
Norm@50keV : 1.08869E-04 ( -1.88678e-05 2.208e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.87 using 59 PHA bins.
# Reduced chi-squared = 1.524 for 57 degrees of freedom
# Null hypothesis probability = 6.582682e-03
Photon flux (15-150 keV) in 418.9 sec: 0.779890 ( -0.0573509 0.0581007 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.57685e-06 ( -6.46828e-07 6.54439e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-120.080000 -114.150000
-113.000000 -112.993700
-112.000000 -107.320000
-106.000000 -99.220000
-98.000000 -95.320000
-94.000000 -92.680000
-92.000000 165.030000
166.000000 220.820000
222.000000 307.660000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.75097E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 871.88 using 59 PHA bins.
# Reduced chi-squared = 15.569 for 56 degrees of freedom
# Null hypothesis probability = 8.485894e-147
Photon flux (15-150 keV) in 418.9 sec: 0.706309 ( -0.072553 0.07075 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.74228e-06 ( -8.14635e-07 7.93816e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-120.080000 -114.150000
-113.000000 -112.993700
-112.000000 -107.320000
-106.000000 -99.220000
-98.000000 -95.320000
-94.000000 -92.680000
-92.000000 165.030000
166.000000 220.820000
222.000000 307.660000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.749643 ( -2.20078 3.92396 )
beta : -9.36831 ( 9.37153 1.64678 )
Epeak [keV] : 8.39323 ( -2.12941 2.16721 )
Norm@50keV : 67.9560 ( -69.3371 59292.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.40 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 55 degrees of freedom
# Null hypothesis probability = 3.183430e-01
Photon flux (15-150 keV) in 418.9 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] : 2.60910 (-0.102937 0.111327)
R^2/D10^2 : 253.830 (-78.3157 110.612)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.27 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.584686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.911e-06 7.771e-07
25- 50 6.890e-07 7.708e-08
50-150 3.278e-10 1.348e-10
15-150 8.600e-06 8.336e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.34161 (-0.240615 0.26888)
Norm : 292.955 (-77.7302 103.833)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.86 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.067554e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.330e-06 8.273e-07
25- 50 7.512e-07 7.771e-08
50-150 1.815e-09 7.084e-10
15-150 9.083e-06 7.917e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.3449 ( )
R1^2/D10^2 : 2.73604E-03 (-0.00247079 0.0993518)
kT2 [keV] : 2.56199 (-0.109312 0.123788)
R2^2/D10^2 : 292.046 (-97.6862 40.7689)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.11 using 59 PHA bins.
#Fit statistic : Chi-Squared = 58.11 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 55 degrees of freedom
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Null hypothesis probability = 2.958404e-01
# Null hypothesis probability = 3.616114e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.995e-06 2.176e-05
25- 50 7.043e-07 5.670e-06
50-150 7.047e-10 2.723e-08
15-150 8.700e-06 2.040e-05
Peak spectrum fit
Power-law model
Time interval is from -68.232 sec. to -67.232 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.59050 ( -0.771902 0.921018 )
Norm@50keV : 9.43936E-04 ( -0.000579962 0.000980162 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.32 using 59 PHA bins.
# Reduced chi-squared = 0.8127 for 57 degrees of freedom
# Null hypothesis probability = 8.429843e-01
Photon flux (15-150 keV) in 1 sec: 0.990930 ( -0.175146 0.175268 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29284e-08 ( -6.64358e-09 7.0356e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -68.232 sec. to -67.232 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.25584E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.33 using 59 PHA bins.
# Reduced chi-squared = 1.702 for 56 degrees of freedom
# Null hypothesis probability = 8.214603e-04
Photon flux (15-150 keV) in 1 sec: 0.987953 ( -0.173266 0.175507 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.25953e-08 ( -6.3766e-09 7.1128e-09 ) ergs/cm2
Band function
Time interval is from -68.232 sec. to -67.232 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.25408 ( 9.25408 9.25408 )
beta : -4.59073 ( -0.921159 0.772406 )
Epeak [keV] : 247.172 ( -247.172 -247.172 )
Norm@50keV : 0.128266 ( -0.0788208 0.133215 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.32 using 59 PHA bins.
# Reduced chi-squared = 0.8422 for 55 degrees of freedom
# Null hypothesis probability = 7.912788e-01
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] : 3.05554 (-0.601272 0.768118)
R^2/D10^2 : 120.021 (-120.566 409.245)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.76 using 59 PHA bins.
# Reduced chi-squared = 0.8905 for 57 degrees of freedom
# Null hypothesis probability = 7.068867e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.512e-08 1.395e-08
25- 50 3.902e-09 2.326e-09
50-150 7.285e-12 7.805e-12
15-150 2.903e-08 1.630e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.56965 (-1.89672 3.00008)
Norm : 92.7217 (-57.1536 186.433)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.38 using 59 PHA bins.
# Reduced chi-squared = 0.8488 for 57 degrees of freedom
# Null hypothesis probability = 7.848924e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.482e-08 1.075e-08
25- 50 5.492e-09 3.093e-09
50-150 9.568e-11 9.516e-11
15-150 3.040e-08 1.405e-08
Double BB
R1^2/D10^2 : 3831.05 ( )
kT2 [keV] : 5.04045 (-4.12198 29.3796)
R2^2/D10^2 : 4.56303 (-4.28295 62.8256)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.03 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.15 using 59 PHA bins.
#Fit statistic : Chi-Squared = 46.14 using 59 PHA bins.
# Reduced chi-squared = 0.8550 for 55 degrees of freedom
# Reduced chi-squared = 0.8391 for 55 degrees of freedom
# Reduced chi-squared = 0.8388 for 55 degrees of freedom
# Null hypothesis probability = 7.691791e-01
# Null hypothesis probability = 7.965895e-01
# Null hypothesis probability = 7.969757e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.473e-08 1.367e-08
25- 50 7.099e-09 3.894e-09
50-150 4.286e-09 3.206e-09
15-150 3.611e-08 1.815e-08
Plot creation:
Sat Oct 26 15:46:14 EDT 2013