batgrbproduct Analysis for Trigger=683383
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): Wed Apr 20 21:53:58 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger683383/batgroup_hand_proc
======================================================================
Trigger: 00683383 Segment: 000
BAT Trigger Time: 482771813.568 [s; MET]
Trigger Stop: 482771814.592 [s; MET]
UTC: 2016-04-19T15:16:37.419400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 16.4243148860276 Dec: -27.3425780118945 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 16.19
Image Trigger?: NO
Rate S/N Ratio: 48.0728613668877 [ if not an image trigger ]
Image S/N Ratio: 16.19
Flight Position: [ source = BAT ]
RA: 16.4243148860276 Dec: -27.3425780118945 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 16.4179088096819 Dec: -27.3412969350101 [deg; J2000]
{ 01h 05m 40.3s , -27d 20' 28.7" }
+/- 1.02323775929153 [arcmin] (estimated 90% radius based on SNR)
+/- 0.404927766941735 [arcmin] (formal 1-sigma fit error)
SNR: 29.4351432880563
Angular difference between Flight and Ground position is 0.349969 arcmin
Partial Coding Fraction: 0.1699219 [ including projection effects ]
Duration
T90: 8.78399991989136 +/- 1.14866879810668
Measured from: -3.02399998903275
to: 5.75999993085861 [s; relative to TRIGTIME]
T50: 3.42399996519089 +/- 0.463896553141211
Measured from: -0.728000044822693
to: 2.69599992036819 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0
to: 1 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.48800003528595
to: 8.45199996232986 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.987357 1.856251 1.621950 0.488377
0.064697 0.071292 0.066135 0.050135 [error]
Peak 0.178690 0.358972 0.363545 0.147187
0.020718 0.025189 0.024876 0.018311 [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 4.37e-07 8.52e-07 1.29e-06 4.24e-06 3.62e-06 6.82e-06 erg/cm2
Error 3.52e-08 4.21e-08 6.39e-08 4.55e-07 1.62e-07 4.93e-07 erg/cm2
Peak flux Power-law 2.39e+00 2.83e+00 2.43e+00 3.54e+00 8.90e+00 1.12e+01 ph/cm2/s
Error 3.31e-01 2.47e-01 1.94e-01 5.75e-01 6.80e-01 8.30e-01 ph/cm2/s
Fluence Cutoff-PL 3.79e-07 8.96e-07 1.38e-06 2.03e-06 3.53e-06 4.69e-06 erg/cm2
Error 4.37e-08 4.89e-08 7.85e-08 6.98e-07 1.71e-07 6.96e-07 erg/cm2
Peak flux Cutoff-PL 2.15e+00 2.92e+00 2.58e+00 2.37e+00 8.79e+00 1.00e+01 ph/cm2/s
Error 4.04e-01 2.74e-01 2.51e-01 1.00e+00 6.88e-01 1.22e+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 1.402 0.072 - - 2.90e-02 1.24e-03 53.010 57
CPL 0.763 0.330 107.1 35.2 5.73e-02 2.03e-02 40.460 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.224 0.118 - - 7.56e-02 5.50e-03 44.480 57
CPL 0.779 0.477 156.8 -50.6 1.21e-01 6.27e-02 41.720 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: 11.584000 sec.
T50 in the 50-300 keV band: 3.200000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 12.940 -4.488 8.452
T90 8.784 -3.024 5.760
T50 3.424 -0.728 2.696
Peak 1.000 0.000 1.000
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
16.4179 -27.3413 0.0065 48.6983 -144.5968 5.2512777 29.435 TRIG_00683383
Foreground time interval of the image:
-4.488 8.452 (delta_t = 12.940 [sec])
Background time interval of the image:
-239.568 -4.488 (delta_t = 235.080 [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 -4.488 sec. to 8.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40226 ( -0.0716618 0.0714871 )
Norm@50keV : 2.89796E-02 ( -0.00124021 0.00124014 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.01 using 59 PHA bins.
# Reduced chi-squared = 0.9300 for 57 degrees of freedom
# Null hypothesis probability = 6.254992e-01
Photon flux (15-150 keV) in 12.94 sec: 3.53098 ( -0.163411 0.163805 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.62179e-06 ( -1.61803e-07 1.61982e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.488 sec. to 8.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.762502 ( -0.34232 0.317988 )
Epeak [keV] : 107.146 ( -19.6308 50.6972 )
Norm@50keV : 5.73131E-02 ( -0.0161504 0.0244473 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.46 using 59 PHA bins.
# Reduced chi-squared = 0.7226 for 56 degrees of freedom
# Null hypothesis probability = 9.413956e-01
Photon flux (15-150 keV) in 12.94 sec: 3.43188 ( -0.16935 0.16988 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53353e-06 ( -1.71455e-07 1.70601e-07 ) ergs/cm2
Band function
Time interval is from -4.488 sec. to 8.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.169888 ( -0.677734 1.43618 )
beta : -1.73416 ( -0.337714 0.185886 )
Epeak [keV] : 69.2115 ( -21.4092 37.1163 )
Norm@50keV : 0.124586 ( -0.0832524 0.936817 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.27 using 59 PHA bins.
# Reduced chi-squared = 0.6595 for 55 degrees of freedom
# Null hypothesis probability = 9.759186e-01
Photon flux (15-150 keV) in 12.94 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] : 17.2914 ( )
R^2/D10^2 : 0.257153 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 117.59 using 59 PHA bins.
# Reduced chi-squared = 2.0629 for 57 degrees of freedom
# Null hypothesis probability = 4.240519e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.017e-07 1.799e-08
25- 50 9.043e-07 5.254e-08
50-150 1.941e-06 1.275e-07
15-150 3.047e-06 1.410e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-10.2884 -200)
Norm : 14.8831 (-0.638135 0.638135)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.24 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 57 degrees of freedom
# Null hypothesis probability = 3.593029e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.796e-07 2.077e-08
25- 50 9.225e-07 4.212e-08
50-150 2.023e-06 1.003e-07
15-150 3.425e-06 1.618e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.6491 (-1.75249 1.74609)
R1^2/D10^2 : 0.923608 (-0.301411 0.560241)
kT2 [keV] : 37.2335 (-9.08219 25.0942)
R2^2/D10^2 : 1.25414E-02 (-0.00976663 0.0144765)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.77 using 59 PHA bins.
# Reduced chi-squared = 0.7050 for 55 degrees of freedom
# Null hypothesis probability = 9.522331e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.117e-07 4.464e-08
25- 50 9.658e-07 1.298e-07
50-150 2.253e-06 7.814e-07
15-150 3.531e-06 9.155e-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: 1.22382 ( -0.118495 0.117562 )
Norm@50keV : 7.55814E-02 ( -0.00550429 0.00549897 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.48 using 59 PHA bins.
# Reduced chi-squared = 0.7803 for 57 degrees of freedom
# Null hypothesis probability = 8.864472e-01
Photon flux (15-150 keV) in 1 sec: 8.90259 ( -0.679483 0.680707 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.61749e-07 ( -5.85823e-08 5.86724e-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: 0.778932 ( -0.50984 0.445068 )
Epeak [keV] : 156.785 ( -55.6488 -156.786 )
Norm@50keV : 0.120655 ( -0.043561 0.0818144 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.72 using 59 PHA bins.
# Reduced chi-squared = 0.7450 for 56 degrees of freedom
# Null hypothesis probability = 9.222486e-01
Photon flux (15-150 keV) in 1 sec: 8.79500 ( -0.68737 0.68876 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.54552e-07 ( -6.0427e-08 6.0079e-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 : 0.955802 ( -1.74836 -0.522805 )
beta : -1.39538 ( 1.39198 0.185556 )
Epeak [keV] : 48.0796 ( -16.9237 179.179 )
Norm@50keV : 1.60880 ( -1.64398 543.773 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.75 using 59 PHA bins.
# Reduced chi-squared = 0.7228 for 55 degrees of freedom
# Null hypothesis probability = 9.394307e-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] : 19.4775 (-1.77419 2.00076)
R^2/D10^2 : 0.457636 (-0.128097 0.17305)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.45 using 59 PHA bins.
# Reduced chi-squared = 1.341 for 57 degrees of freedom
# Null hypothesis probability = 4.373647e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.381e-08 5.025e-09
25- 50 1.655e-07 1.755e-08
50-150 4.634e-07 5.025e-08
15-150 6.627e-07 6.060e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-14.3549 -200)
Norm : 37.5042 (-2.77602 2.77602)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.17 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 57 degrees of freedom
# Null hypothesis probability = 2.138377e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.342e-08 8.130e-09
25- 50 1.797e-07 1.985e-08
50-150 3.941e-07 9.560e-08
15-150 6.672e-07 1.588e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.35710 (-2.17721 2.6359)
R1^2/D10^2 : 3.07311 (-1.52401 3.663)
kT2 [keV] : 34.7655 (-7.91379 20.408)
R2^2/D10^2 : 5.25223E-02 (-0.0399052 0.0781185)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.85 using 59 PHA bins.
# Reduced chi-squared = 0.7246 for 55 degrees of freedom
# Null hypothesis probability = 9.380211e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.241e-08 2.013e-08
25- 50 1.793e-07 5.004e-08
50-150 5.195e-07 2.284e-07
15-150 7.613e-07 2.711e-07
Plot creation:
Wed Apr 20 22:19:21 EDT 2016