batgrbproduct Analysis for Trigger=653838
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 Sep 1 12:28:29 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger653838/GCN5_download_cron
======================================================================
Trigger: 00653838 Segment: 000
BAT Trigger Time: 462710067.968 [s; MET]
Trigger Stop: 462710068.48 [s; MET]
UTC: 2015-08-31T10:34:12.898940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 221.022515218217 Dec: -25.6495753619322 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.35
Image Trigger?: NO
Rate S/N Ratio: 56.4889369699944 [ if not an image trigger ]
Image S/N Ratio: 14.35
Flight Position: [ source = BAT ]
RA: 221.022515218217 Dec: -25.6495753619322 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 221.033655627114 Dec: -25.6190017966397 [deg; J2000]
{ 14h 44m 08.1s , -25d 37' 08.4" }
+/- 1.32894788412812 [arcmin] (estimated 90% radius based on SNR)
+/- 0.369514373694437 [arcmin] (formal 1-sigma fit error)
SNR: 20.2618199288815
Angular difference between Flight and Ground position is 1.930866 arcmin
Partial Coding Fraction: 0.5234375 [ including projection effects ]
Duration
T90: 1.14800000190735 +/- 0.226061963077297
Measured from: 0.0200001001358032
to: 1.16800010204315 [s; relative to TRIGTIME]
T50: 0.503999948501587 +/- 0.0920869208510307
Measured from: 0.18800014257431
to: 0.692000091075897 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0320000052452087
to: 1.40399998426437 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.082941 0.147252 0.169368 0.101814
0.012637 0.012759 0.012333 0.010264 [error]
Peak 0.064595 0.128353 0.156285 0.098666
0.010873 0.011252 0.011352 0.009475 [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 2.19e-08 6.18e-08 1.41e-07 8.66e-07 3.81e-07 1.09e-06 erg/cm2
Error 4.43e-09 7.19e-09 1.16e-08 1.86e-07 3.17e-08 1.87e-07 erg/cm2
Peak flux Power-law 5.67e-01 9.12e-01 1.11e+00 2.65e+00 3.35e+00 5.24e+00 ph/cm2/s
Error 1.18e-01 1.13e-01 8.80e-02 5.10e-01 2.81e-01 4.97e-01 ph/cm2/s
Fluence Cutoff-PL 2.16e-08 6.30e-08 1.41e-07 8.16e-07 3.81e-07 1.03e-06 erg/cm2
Error 4.29e-09 7.31e-09 1.15e-08 2.34e-07 3.08e-08 2.35e-07 erg/cm2
Peak flux Cutoff-PL 5.78e-01 9.21e-01 1.11e+00 2.58e+00 3.35e+00 5.19e+00 ph/cm2/s
Error 1.17e-01 1.12e-01 8.83e-02 -------- 2.82e-01 5.63e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band -------- -------- -------- -------- -------- -------- ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.808 0.161 - - 2.28e-02 1.98e-03 57.580 57
CPL 0.801 0.215 10000.0 0.0 2.29e-02 1.90e-03 57.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.718 0.161 - - 2.90e-02 2.57e-03 49.340 57
CPL 0.720 0.218 9999.4 0.0 2.93e-02 4.49e-03 49.450 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: 0.960000 sec.
T50 in the 50-300 keV band: 0.512000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 1.436 -0.032 1.404
T90 1.148 0.020 1.168
T50 0.504 0.188 0.692
Peak 1.000 0.000 1.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
221.0337 -25.6190 0.0095 31.2 -59.4 0.5213 20.3 TRIG_00653838
------------------------------------------
Foreground time interval of the image:
-0.032 1.404 (delta_t = 1.436 [sec])
Background time interval of the image:
-239.968 -0.032 (delta_t = 239.936 [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 -0.032 sec. to 1.404 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.808067 ( -0.164545 0.158047 )
Norm@50keV : 2.27720E-02 ( -0.00199994 0.00196046 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.58 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 57 degrees of freedom
# Null hypothesis probability = 4.537356e-01
Photon flux (15-150 keV) in 1.436 sec: 2.61653 ( -0.221162 0.222094 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8085e-07 ( -3.15927e-08 3.17228e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.032 sec. to 1.404 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.800970 ( -0.282637 0.147487 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 2.29323E-02 ( -0.00200577 0.00178809 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.67 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 56 degrees of freedom
# Null hypothesis probability = 4.133268e-01
Photon flux (15-150 keV) in 1.436 sec: 2.62493 ( -0.23188 0.2139 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.8078e-07 ( -3.148e-08 3.00454e-08 ) ergs/cm2
Band function
Time interval is from -0.032 sec. to 1.404 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.786963 ( 0.786855 0.786855 )
beta : -0.808092 ( -0.158099 0.164425 )
Epeak [keV] : 16.6273 ( -16.6297 -16.6297 )
Norm@50keV : 3.25864E-02 ( -0.0122556 567973 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.58 using 59 PHA bins.
# Reduced chi-squared = 1.047 for 55 degrees of freedom
# Null hypothesis probability = 3.800773e-01
Photon flux (15-150 keV) in 1.436 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] : 30.0107 (-3.945 5.01333)
R^2/D10^2 : 3.77037E-02 (-0.0131839 0.0190291)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.12 using 59 PHA bins.
# Reduced chi-squared = 1.686 for 57 degrees of freedom
# Null hypothesis probability = 9.206213e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.627e-09 1.451e-09
25- 50 4.705e-08 7.582e-09
50-150 2.993e-07 3.791e-08
15-150 3.540e-07 3.748e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.8815 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 124.14 using 59 PHA bins.
# Reduced chi-squared = 2.1779 for 57 degrees of freedom
# Null hypothesis probability = 6.823105e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.891e-08 8.487e-09
25- 50 7.485e-08 2.387e-08
50-150 1.641e-07 7.408e-08
15-150 2.779e-07 1.052e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.57688 (-2.22627 2.86985)
R1^2/D10^2 : 1.06330 (-0.6361 1.96596)
kT2 [keV] : 56.4944 (-16.1127 56.2229)
R2^2/D10^2 : 6.42823E-03 (-0.00422146 0.00867241)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.98 using 59 PHA bins.
# Reduced chi-squared = 0.9815 for 55 degrees of freedom
# Null hypothesis probability = 5.135022e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.421e-08 1.121e-08
25- 50 6.355e-08 2.486e-08
50-150 3.097e-07 1.512e-07
15-150 3.975e-07 1.590e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.717909 ( -0.164391 0.157554 )
Norm@50keV : 2.89821E-02 ( -0.0026037 0.00254599 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.34 using 59 PHA bins.
# Reduced chi-squared = 0.8657 for 57 degrees of freedom
# Null hypothesis probability = 7.544771e-01
Photon flux (15-150 keV) in 1 sec: 3.34557 ( -0.28002 0.281036 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50938e-07 ( -2.90942e-08 2.92034e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.720096 ( -0.285485 0.149666 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 2.92771E-02 ( -0.00243332 0.00653831 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.45 using 59 PHA bins.
# Reduced chi-squared = 0.8830 for 56 degrees of freedom
# Null hypothesis probability = 7.195941e-01
Photon flux (15-150 keV) in 1 sec: 3.35427 ( -0.29112 0.272 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.50979e-07 ( -2.9051e-08 2.7789e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 1.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.923088 ( 0.923299 0.923299 )
beta : -0.717902 ( -0.157637 0.164481 )
Epeak [keV] : 17.3346 ( -17.3313 -17.3313 )
Norm@50keV : 3.93240E-02 ( -0.0127969 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.34 using 59 PHA bins.
# Reduced chi-squared = 0.8972 for 55 degrees of freedom
# Null hypothesis probability = 6.895989e-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] : 31.7625 (-4.21306 5.39981)
R^2/D10^2 : 4.25099E-02 (-0.0147218 0.0210109)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 83.75 using 59 PHA bins.
# Reduced chi-squared = 1.469 for 57 degrees of freedom
# Null hypothesis probability = 1.206081e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.474e-09 1.186e-09
25- 50 4.085e-08 6.095e-09
50-150 2.841e-07 3.810e-08
15-150 3.314e-07 3.665e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 13.5965 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 130.60 using 59 PHA bins.
# Reduced chi-squared = 2.2913 for 57 degrees of freedom
# Null hypothesis probability = 1.050353e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.386e-08 1.087e-08
25- 50 6.513e-08 1.810e-08
50-150 1.428e-07 6.272e-08
15-150 2.418e-07 9.508e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.02822 (-2.4238 3.18992)
R1^2/D10^2 : 1.06695 (-0.641445 1.97976)
kT2 [keV] : 60.1179 (-17.8415 71.9975)
R2^2/D10^2 : 7.49059E-03 (-0.00480769 0.0108063)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.97 using 59 PHA bins.
# Reduced chi-squared = 0.8358 for 55 degrees of freedom
# Null hypothesis probability = 8.020195e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.951e-08 9.588e-09
25- 50 5.537e-08 2.154e-08
50-150 2.894e-07 1.397e-07
15-150 3.643e-07 1.448e-07
Plot creation:
Tue Sep 1 12:32:50 EDT 2015