batgrbproduct Analysis for Trigger=660671
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): Thu Oct 22 07:34:50 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger660671/GCN5_download_cron
======================================================================
Trigger: 00660671 Segment: 000
BAT Trigger Time: 467083767.872 [s; MET]
Trigger Stop: 467083768.896 [s; MET]
UTC: 2015-10-21T01:29:12.571160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 337.611486078815 Dec: -33.1989135771919 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.89
Image Trigger?: NO
Rate S/N Ratio: 35.028559776274 [ if not an image trigger ]
Image S/N Ratio: 6.89
Flight Position: [ source = BAT ]
RA: 337.611486078815 Dec: -33.1989135771919 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 337.64722823962 Dec: -33.189361845312 [deg; J2000]
{ 22h 30m 35.3s , -33d 11' 21.7" }
+/- 0.957435471806299 [arcmin] (estimated 90% radius based on SNR)
+/- 0.297263540177833 [arcmin] (formal 1-sigma fit error)
SNR: 32.3671745017648
Angular difference between Flight and Ground position is 1.883876 arcmin
Partial Coding Fraction: 0.1054688 [ including projection effects ]
Duration
T90: 110.243999958038 +/- 3.64878062317384
Measured from: -15.2639998793602
to: 94.9800000786781 [s; relative to TRIGTIME]
T50: 35.5039999485016 +/- 2.49856280825218
Measured from: 0.556000113487244
to: 36.0600000619888 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.131999969482422
to: 0.868000030517578 [s; relative to TRIGTIME]
Total Fluence
Measured from: -21.6279999613762
to: 127.424000024796 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 10.609886 14.979416 11.878519 3.659418
0.176595 0.198113 0.188011 0.147730 [error]
Peak 0.293783 0.355495 0.372549 0.129422
0.026126 0.031316 0.032659 0.024516 [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 4.01e-06 7.06e-06 9.52e-06 2.64e-05 2.76e-05 4.70e-05 erg/cm2
Error 1.65e-07 1.66e-07 2.11e-07 1.38e-06 5.30e-07 1.45e-06 erg/cm2
Peak flux Power-law 3.04e+00 3.20e+00 2.38e+00 2.87e+00 9.73e+00 1.15e+01 ph/cm2/s
Error 4.66e-01 2.94e-01 2.67e-01 6.75e-01 8.40e-01 1.02e+00 ph/cm2/s
Fluence Cutoff-PL 3.94e-06 7.07e-06 9.53e-06 2.46e-05 2.76e-05 4.52e-05 erg/cm2
Error 2.08e-07 1.61e-07 1.65e-07 2.26e-06 5.26e-07 1.85e-06 erg/cm2
Peak flux Cutoff-PL 3.08e+00 3.21e+00 2.37e+00 2.79e+00 9.74e+00 1.14e+01 ph/cm2/s
Error 4.59e-01 2.92e-01 2.69e-01 7.98e-01 8.40e-01 1.05e+00 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 1.569 0.037 - - 1.99e-02 3.79e-04 35.030 57
CPL 1.567 0.100 9998.8 0.0 2.00e-02 1.50e-03 35.040 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.425 0.156 - - 7.94e-02 6.97e-03 48.170 57
CPL 1.423 0.212 9999.4 0.0 7.97e-02 5.41e-02 48.200 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: 102.336000 sec.
T50 in the 50-300 keV band: 29.888000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 149.052 -21.628 127.424
T90 110.244 -15.264 94.980
T50 35.504 0.556 36.060
Peak 1.000 -0.132 0.868
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
337.6472 -33.1894 0.0060 43.6 37.6 21.7187 32.4 TRIG_00660671
------------------------------------------
Foreground time interval of the image:
-21.628 14.629 (delta_t = 36.257 [sec])
Background time interval of the image:
-239.872 -55.286 (delta_t = 184.586 [sec])
-53.872 -21.628 (delta_t = 32.244 [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
Multiple GTIs in the spectrum
tstart tstop
-21.628000 36.658000
38.128000 127.424000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56910 ( -0.0367903 0.0367934 )
Norm@50keV : 1.99289E-02 ( -0.000379421 0.000379296 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.03 using 59 PHA bins.
# Reduced chi-squared = 0.6146 for 57 degrees of freedom
# Null hypothesis probability = 9.903413e-01
Photon flux (15-150 keV) in 147.6 sec: 2.53705 ( -0.0579321 0.0581848 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76185e-05 ( -5.2963e-07 5.29835e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-21.628000 36.658000
38.128000 127.424000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56658 ( -0.108631 0.0921146 )
Epeak [keV] : 9998.79 ( -9998.8 -9998.8 )
Norm@50keV : 1.99803E-02 ( -0.000378518 0.00261561 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 35.04 using 59 PHA bins.
# Reduced chi-squared = 0.6258 for 56 degrees of freedom
# Null hypothesis probability = 9.873177e-01
Photon flux (15-150 keV) in 147.6 sec: 2.53628 ( -0.0591 0.05636 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.76216e-05 ( -5.25751e-07 5.25308e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-21.628000 36.658000
38.128000 127.424000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.893537 ( 1.05458 5.7005 )
beta : -1.58155 ( -3.03835 0.042824 )
Epeak [keV] : 48.1902 ( -48.1206 116.436 )
Norm@50keV : 5.66404E-02 ( -0.0570696 2.25858e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.04 using 59 PHA bins.
# Reduced chi-squared = 0.6188 for 55 degrees of freedom
# Null hypothesis probability = 9.882318e-01
Photon flux (15-150 keV) in 147.6 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] : 17.5159 ( )
R^2/D10^2 : 0.155368 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 717.35 using 59 PHA bins.
# Reduced chi-squared = 12.585 for 57 degrees of freedom
# Null hypothesis probability = 5.751037e-115
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.421e-06 5.343e-08
25- 50 6.435e-06 1.911e-07
50-150 1.423e-05 4.207e-07
15-150 2.208e-05 4.945e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-7.02812 -200)
Norm : 10.2472 (-0.194315 0.194315)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.84 using 59 PHA bins.
# Reduced chi-squared = 0.9620 for 57 degrees of freedom
# Null hypothesis probability = 5.567132e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.767e-06 8.339e-08
25- 50 7.247e-06 1.705e-07
50-150 1.589e-05 3.690e-07
15-150 2.691e-05 6.494e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.99911 (-0.528902 0.553223)
R1^2/D10^2 : 1.71714 (-0.355297 0.474754)
kT2 [keV] : 31.6896 (-2.30121 2.8334)
R2^2/D10^2 : 1.56583E-02 (-0.00400549 0.00480935)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.55 using 59 PHA bins.
# Reduced chi-squared = 0.9010 for 55 degrees of freedom
# Null hypothesis probability = 6.819842e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.283e-06 2.074e-07
25- 50 7.343e-06 2.812e-07
50-150 1.667e-05 7.528e-07
15-150 2.730e-05 9.077e-07
Peak spectrum fit
Power-law model
Time interval is from -0.132 sec. to 0.868 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42506 ( -0.155004 0.157826 )
Norm@50keV : 7.94457E-02 ( -0.00698797 0.00694293 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8451 for 57 degrees of freedom
# Null hypothesis probability = 7.911555e-01
Photon flux (15-150 keV) in 1 sec: 9.73147 ( -0.839351 0.840355 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.63833e-07 ( -7.57294e-08 7.62077e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.132 sec. to 0.868 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42305 ( -0.265815 0.158037 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 7.97043E-02 ( -0.0797053 0.0284194 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.20 using 59 PHA bins.
# Reduced chi-squared = 0.8606 for 56 degrees of freedom
# Null hypothesis probability = 7.614459e-01
Photon flux (15-150 keV) in 1 sec: 9.74296 ( -0.85127 0.82824 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.58445e-07 ( -7.0685e-08 8.0572e-08 ) ergs/cm2
Band function
Time interval is from -0.132 sec. to 0.868 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.22247 ( 1.22247 1.22247 )
beta : -1.42501 ( -0.157932 0.1547 )
Epeak [keV] : 15.6146 ( -15.6105 -15.6105 )
Norm@50keV : 0.161709 ( -0.0891292 74059.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8759 for 55 degrees of freedom
# Null hypothesis probability = 7.309680e-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] : 17.1336 (-2.37968 2.70188)
R^2/D10^2 : 0.692758 (-0.263099 0.445544)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 105.31 using 59 PHA bins.
# Reduced chi-squared = 1.8475 for 57 degrees of freedom
# Null hypothesis probability = 1.042589e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.133e-08 7.115e-09
25- 50 1.840e-07 2.385e-08
50-150 3.866e-07 6.430e-08
15-150 6.120e-07 7.320e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-36.3832 -200)
Norm : 39.7840 (-3.40254 3.40254)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.41 using 59 PHA bins.
# Reduced chi-squared = 0.9370 for 57 degrees of freedom
# Null hypothesis probability = 6.105212e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.905e-08 1.037e-08
25- 50 1.905e-07 2.680e-08
50-150 4.179e-07 2.186e-07
15-150 7.075e-07 1.980e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.01600 (-1.11867 1.35836)
R1^2/D10^2 : 18.9731 (-10.1349 24.2954)
kT2 [keV] : 31.3650 (-5.95551 9.89354)
R2^2/D10^2 : 8.03701E-02 (-0.0456409 0.0794042)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.95 using 59 PHA bins.
# Reduced chi-squared = 0.7991 for 55 degrees of freedom
# Null hypothesis probability = 8.574318e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.036e-07 3.501e-08
25- 50 1.674e-07 4.178e-08
50-150 5.238e-07 1.595e-07
15-150 7.948e-07 2.334e-07
Plot creation:
Thu Oct 22 07:40:06 EDT 2015