batgrbproduct Analysis for Trigger=683906
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): Mon Apr 25 15:14:26 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger683906/GCN5_download_cron
======================================================================
Trigger: 00683906 Segment: 000
BAT Trigger Time: 483191363.52 [s; MET]
Trigger Stop: 483191364.544 [s; MET]
UTC: 2016-04-24T11:49:07.348300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 319.480565124725 Dec: -60.4052836164155 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.78
Image Trigger?: NO
Rate S/N Ratio: 43.5086198356142 [ if not an image trigger ]
Image S/N Ratio: 15.78
Flight Position: [ source = BAT ]
RA: 319.480565124725 Dec: -60.4052836164155 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 319.483474799868 Dec: -60.4083444914862 [deg; J2000]
{ 21h 17m 56.0s , -60d 24' 30.0" }
+/- 1.12682650277629 [arcmin] (estimated 90% radius based on SNR)
+/- 0.410450570727524 [arcmin] (formal 1-sigma fit error)
SNR: 25.6470179492117
Angular difference between Flight and Ground position is 0.202882 arcmin
Partial Coding Fraction: 0.3359375 [ including projection effects ]
Duration
T90: 6.31999999284744 +/- 0.868469890065956
Measured from: -0.863999843597412
to: 5.45600014925003 [s; relative to TRIGTIME]
T50: 1.93600004911423 +/- 0.354175061749463
Measured from: 0.0960001349449158
to: 2.03200018405914 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0680000185966492
to: 1.06800001859665 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.42399996519089
to: 6.6240000128746 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.389296 0.681674 0.566312 0.182587
0.034185 0.037268 0.034043 0.027615 [error]
Peak 0.115505 0.204336 0.233097 0.083535
0.013431 0.015517 0.015915 0.012436 [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 1.49e-07 2.91e-07 4.41e-07 1.45e-06 1.24e-06 2.33e-06 erg/cm2
Error 1.68e-08 1.98e-08 3.21e-08 2.32e-07 8.01e-08 2.52e-07 erg/cm2
Peak flux Power-law 1.27e+00 1.59e+00 1.46e+00 2.33e+00 5.11e+00 6.64e+00 ph/cm2/s
Error 1.93e-01 1.48e-01 1.21e-01 4.12e-01 4.01e-01 5.25e-01 ph/cm2/s
Fluence Cutoff-PL 1.42e-07 2.98e-07 4.52e-07 1.03e-06 1.22e-06 1.93e-06 erg/cm2
Error 2.01e-08 2.27e-08 3.71e-08 4.48e-07 8.44e-08 4.42e-07 erg/cm2
Peak flux Cutoff-PL 1.22e+00 1.61e+00 1.49e+00 2.00e+00 5.08e+00 6.31e+00 ph/cm2/s
Error 1.82e-01 1.54e-01 1.50e-01 7.38e-01 4.07e-01 8.36e-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 1.402 0.105 - - 1.59e-02 9.61e-04 47.880 57
CPL 1.153 0.368 184.1 -49.7 2.09e-02 8.97e-03 46.760 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.128 0.130 - - 4.39e-02 3.31e-03 54.860 57
CPL 0.976 0.378 393.5 0.0 5.13e-02 2.31e-02 54.580 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: 3.136000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.048 -1.424 6.624
T90 6.320 -0.864 5.456
T50 1.936 0.096 2.032
Peak 1.000 0.068 1.068
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
319.4835 -60.4083 0.0075 44.4 172.7 1.8418 25.6 TRIG_00683906
------------------------------------------
Foreground time interval of the image:
-1.424 6.624 (delta_t = 8.048 [sec])
Background time interval of the image:
-239.520 -129.070 (delta_t = 110.450 [sec])
-123.520 -1.424 (delta_t = 122.096 [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 -1.424 sec. to 6.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40203 ( -0.104656 0.104483 )
Norm@50keV : 1.59262E-02 ( -0.000960853 0.000960684 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.88 using 59 PHA bins.
# Reduced chi-squared = 0.8400 for 57 degrees of freedom
# Null hypothesis probability = 7.997971e-01
Photon flux (15-150 keV) in 8.048 sec: 1.94041 ( -0.123981 0.12426 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.23799e-06 ( -8.00306e-08 8.02353e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.424 sec. to 6.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.15288 ( -0.435851 0.299543 )
Epeak [keV] : 184.105 ( -84.7922 -184.104 )
Norm@50keV : 2.09144E-02 ( -0.00563625 0.0123055 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.76 using 59 PHA bins.
# Reduced chi-squared = 0.8351 for 56 degrees of freedom
# Null hypothesis probability = 8.056241e-01
Photon flux (15-150 keV) in 8.048 sec: 1.91908 ( -0.06448 0.12857 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.22352e-06 ( -8.47454e-08 8.41257e-08 ) ergs/cm2
Band function
Time interval is from -1.424 sec. to 6.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.165515 ( 0.485491 0.485491 )
beta : -1.51678 ( 1.51132 0.161126 )
Epeak [keV] : 52.5343 ( -52.4162 219.967 )
Norm@50keV : 9.06948E-02 ( -0.0931703 665.541 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.42 using 59 PHA bins.
# Reduced chi-squared = 0.8257 for 55 degrees of freedom
# Null hypothesis probability = 8.181843e-01
Photon flux (15-150 keV) in 8.048 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] : 17.0309 (-1.31441 1.45091)
R^2/D10^2 : 0.145071 (-0.0359298 0.0469261)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 106.24 using 59 PHA bins.
# Reduced chi-squared = 1.8638 for 57 degrees of freedom
# Null hypothesis probability = 8.273375e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.893e-08 8.362e-09
25- 50 3.054e-07 2.736e-08
50-150 6.329e-07 6.841e-08
15-150 1.007e-06 7.444e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-19.419 -200)
Norm : 8.09883 (-0.490202 0.490202)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.86 using 59 PHA bins.
# Reduced chi-squared = 0.9449 for 57 degrees of freedom
# Null hypothesis probability = 5.936144e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.623e-07 1.123e-08
25- 50 3.122e-07 2.189e-08
50-150 6.847e-07 1.517e-07
15-150 1.159e-06 1.594e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.53417 (-1.68345 1.92341)
R1^2/D10^2 : 1.01565 (-0.4614 1.01962)
kT2 [keV] : 33.0187 (-7.25866 16.435)
R2^2/D10^2 : 1.17227E-02 (-0.00835594 0.0165061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.71 using 59 PHA bins.
# Reduced chi-squared = 0.8493 for 55 degrees of freedom
# Null hypothesis probability = 7.791952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.276e-07 2.797e-08
25- 50 3.165e-07 6.084e-08
50-150 7.858e-07 2.906e-07
15-150 1.230e-06 3.705e-07
Peak spectrum fit
Power-law model
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12808 ( -0.131158 0.12978 )
Norm@50keV : 4.39121E-02 ( -0.00331856 0.00331119 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.86 using 59 PHA bins.
# Reduced chi-squared = 0.9624 for 57 degrees of freedom
# Null hypothesis probability = 5.559448e-01
Photon flux (15-150 keV) in 1 sec: 5.10826 ( -0.400286 0.401058 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.55081e-07 ( -3.68406e-08 3.69298e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.976276 ( -0.539938 0.216266 )
Epeak [keV] : 393.471 ( -393.471 -393.471 )
Norm@50keV : 5.12944E-02 ( -0.0102133 0.0360229 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.58 using 59 PHA bins.
# Reduced chi-squared = 0.9747 for 56 degrees of freedom
# Null hypothesis probability = 5.285701e-01
Photon flux (15-150 keV) in 1 sec: 5.07989 ( -0.40992 0.40501 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.5328e-07 ( -3.7832e-08 3.7627e-08 ) ergs/cm2
Band function
Time interval is from 0.068 sec. to 1.068 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.951087 ( 0.721691 0.721691 )
beta : -1.26532 ( 1.29901 11.2785 )
Epeak [keV] : 332.442 ( -331.856 -331.856 )
Norm@50keV : 5.28853E-02 ( -0.0118109 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 55 degrees of freedom
# Null hypothesis probability = 4.910465e-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] : 21.2474 (-2.04947 2.35094)
R^2/D10^2 : 0.199529 (-0.0574551 0.0778179)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.53 using 59 PHA bins.
# Reduced chi-squared = 1.553 for 57 degrees of freedom
# Null hypothesis probability = 4.710043e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.693e-08 2.495e-09
25- 50 8.767e-08 1.040e-08
50-150 2.952e-07 3.755e-08
15-150 3.999e-07 3.850e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-13.8677 -200)
Norm : 21.2461 (-1.64384 1.64384)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.10 using 59 PHA bins.
# Reduced chi-squared = 1.493 for 57 degrees of freedom
# Null hypothesis probability = 9.323384e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.292e-08 4.965e-09
25- 50 1.018e-07 1.531e-08
50-150 2.233e-07 6.750e-08
15-150 3.780e-07 9.310e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.17891 (-1.97371 2.89506)
R1^2/D10^2 : 3.61665 (-2.35578 7.95035)
kT2 [keV] : 31.2444 (-5.60861 11.8079)
R2^2/D10^2 : 5.03204E-02 (-0.032307 0.0421362)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.707683e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.821e-08 1.654e-08
25- 50 9.113e-08 2.940e-08
50-150 3.265e-07 1.017e-07
15-150 4.559e-07 1.260e-07
Plot creation:
Mon Apr 25 15:20:59 EDT 2016