batgrbproduct Analysis for Trigger=682522
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 13 01:27:43 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger682522/GCN5_download_cron
======================================================================
Trigger: 00682522 Segment: 000
BAT Trigger Time: 482127850.816 [s; MET]
Trigger Stop: 482127851.84 [s; MET]
UTC: 2016-04-12T04:23:54.702760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.1066844471939 Dec: -67.6453927684835 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.8
Image Trigger?: NO
Rate S/N Ratio: 11.5758369027902 [ if not an image trigger ]
Image S/N Ratio: 6.8
Flight Position: [ source = BAT ]
RA: 33.1066844471939 Dec: -67.6453927684835 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 33.0702728029074 Dec: -67.6394910686807 [deg; J2000]
{ 02h 12m 16.9s , -67d 38' 22.2" }
+/- 0.888318185443131 [arcmin] (estimated 90% radius based on SNR)
+/- 0.251585789283306 [arcmin] (formal 1-sigma fit error)
SNR: 36.0239951708353
Angular difference between Flight and Ground position is 0.903324 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 32.1759999394417 +/- 4.05306009256854
Measured from: -1.38399988412857
to: 30.7920000553131 [s; relative to TRIGTIME]
T50: 12.4559999704361 +/- 1.403977176171
Measured from: 5.89200013875961
to: 18.3480001091957 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 14.4000000357628
to: 15.4000000357628 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.3759999871254
to: 40.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.179938 1.364674 0.714797 0.189267
0.043324 0.045404 0.039421 0.035047 [error]
Peak 0.068451 0.069535 0.047168 0.007329
0.007265 0.007636 0.006620 0.005653 [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 3.87e-07 5.63e-07 6.11e-07 1.24e-06 1.94e-06 2.80e-06 erg/cm2
Error 2.74e-08 2.40e-08 4.01e-08 1.71e-07 9.15e-08 2.05e-07 erg/cm2
Peak flux Power-law 6.66e-01 5.36e-01 2.92e-01 2.32e-01 1.60e+00 1.73e+00 ph/cm2/s
Error 1.13e-01 6.20e-02 5.45e-02 8.29e-02 1.85e-01 2.03e-01 ph/cm2/s
Fluence Cutoff-PL 3.78e-07 5.74e-07 6.10e-07 9.03e-07 1.90e-06 2.47e-06 erg/cm2
Error 3.17e-08 3.03e-08 4.14e-08 4.29e-07 1.14e-07 4.32e-07 erg/cm2
Peak flux Cutoff-PL 6.26e-01 5.73e-01 2.94e-01 1.12e-01 1.57e+00 1.61e+00 ph/cm2/s
Error 1.28e-01 8.24e-02 5.97e-02 1.39e-01 1.90e-01 2.36e-01 ph/cm2/s
Fluence Band 3.57e-07 5.84e-07 5.94e-07 1.10e-06 1.89e-06 2.64e-06 erg/cm2
Error 3.48e-08 3.23e-08 4.23e-08 -------- 9.72e-08 -------- erg/cm2
Peak flux Band 6.61e-01 5.47e-01 2.85e-01 2.15e-01 1.59e+00 1.71e+00 ph/cm2/s
Error -------- -------- -------- -------- 1.89e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.883 0.083 - - 4.74e-03 2.24e-04 59.550 57
CPL 1.707 0.338 74.8 -23.8 5.91e-03 2.28e-03 58.710 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.880 0.213 - - 1.12e-02 1.59e-03 71.360 57
CPL 1.305 0.888 52.8 -5.0 2.36e-02 3.71e-02 69.960 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: 26.368000 sec.
T50 in the 50-300 keV band: 10.560000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 44.552 -4.376 40.176
T90 32.176 -1.384 30.792
T50 12.456 5.892 18.348
Peak 1.000 14.400 15.400
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
33.0703 -67.6395 0.0053 25.4 151.1 2.2088 36.0 TRIG_00682522
------------------------------------------
Foreground time interval of the image:
-4.376 15.485 (delta_t = 19.861 [sec])
Background time interval of the image:
-239.816 -4.376 (delta_t = 235.440 [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 -4.376 sec. to 40.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88341 ( -0.0824179 0.0833606 )
Norm@50keV : 4.74175E-03 ( -0.000224358 0.00022279 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.55 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.831361e-01
Photon flux (15-150 keV) in 44.55 sec: 0.675746 ( -0.0297796 0.0298406 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.94197e-06 ( -9.11796e-08 9.17235e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.376 sec. to 40.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70702 ( -0.353139 0.321868 )
Epeak [keV] : 74.8454 ( -27.2642 -74.8709 )
Norm@50keV : 5.90782E-03 ( -0.00134872 0.00320901 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.71 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 56 degrees of freedom
# Null hypothesis probability = 3.763839e-01
Photon flux (15-150 keV) in 44.55 sec: 0.668201 ( -0.032741 0.032701 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90483e-06 ( -1.14716e-07 1.14066e-07 ) ergs/cm2
Band function
Time interval is from -4.376 sec. to 40.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.24688 ( -2.75611 -0.961601 )
beta : -1.97786 ( -0.204458 0.111546 )
Epeak [keV] : 25.5739 ( -5.7079 23.9598 )
Norm@50keV : 5.66692 ( -5.66692 320.896 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.99 using 59 PHA bins.
# Reduced chi-squared = 0.9635 for 55 degrees of freedom
# Null hypothesis probability = 5.518025e-01
Photon flux (15-150 keV) in 44.55 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.89284e-06 ( -1.89253e-06 -9.78051e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.1175 ( )
R^2/D10^2 : 0.202881 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 172.47 using 59 PHA bins.
# Reduced chi-squared = 3.0258 for 57 degrees of freedom
# Null hypothesis probability = 1.529504e-13
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.339e-07 1.744e-08
25- 50 6.704e-07 3.252e-08
50-150 4.719e-07 4.836e-08
15-150 1.376e-06 7.150e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 86.9514 (-12.9194 16.8835)
Norm : 3.04082 (-0.209826 0.231935)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.92 using 59 PHA bins.
# Reduced chi-squared = 1.086 for 57 degrees of freedom
# Null hypothesis probability = 3.048638e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.530e-07 2.377e-08
25- 50 5.926e-07 2.829e-08
50-150 8.832e-07 2.248e-07
15-150 1.829e-06 1.377e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.48148 (-0.897181 0.899732)
R1^2/D10^2 : 0.726511 (-0.228056 0.390627)
kT2 [keV] : 30.9660 (-7.57861 15.3869)
R2^2/D10^2 : 3.19896E-03 (-0.002185 0.00529601)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Null hypothesis probability = 3.970954e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.312e-07 3.626e-08
25- 50 6.127e-07 6.014e-08
50-150 9.766e-07 3.508e-07
15-150 1.920e-06 4.063e-07
Peak spectrum fit
Power-law model
Time interval is from 14.400 sec. to 15.400 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.87954 ( -0.207054 0.219286 )
Norm@50keV : 1.12343E-02 ( -0.00161023 0.00157024 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.36 using 59 PHA bins.
# Reduced chi-squared = 1.252 for 57 degrees of freedom
# Null hypothesis probability = 9.559194e-02
Photon flux (15-150 keV) in 1 sec: 1.59841 ( -0.185215 0.185242 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03276e-07 ( -1.44393e-08 1.47495e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 14.400 sec. to 15.400 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30540 ( -0.977353 0.798422 )
Epeak [keV] : 52.8051 ( -42.7552 -52.8051 )
Norm@50keV : 2.36423E-02 ( -0.0148637 0.0592757 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.96 using 59 PHA bins.
# Reduced chi-squared = 1.249 for 56 degrees of freedom
# Null hypothesis probability = 9.944759e-02
Photon flux (15-150 keV) in 1 sec: 1.56707 ( -0.19033 0.19035 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.8136e-08 ( -1.55784e-08 1.6377e-08 ) ergs/cm2
Band function
Time interval is from 14.400 sec. to 15.400 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.30525 ( 1.36237 0.767876 )
beta : -9.99994 ( 9.99979 19.9998 )
Epeak [keV] : 52.7878 ( -37.0071 -52.7878 )
Norm@50keV : 2.36450E-02 ( -0.0135168 0.0579898 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.96 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 55 degrees of freedom
# Null hypothesis probability = 8.434513e-02
Photon flux (15-150 keV) in 1 sec: 1.59213 ( 5.40787 -0.18927 ) 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] : 11.1825 (-1.52983 1.75927)
R^2/D10^2 : 0.497951 (-0.208519 0.362248)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.52 using 59 PHA bins.
# Reduced chi-squared = 1.500 for 57 degrees of freedom
# Null hypothesis probability = 8.592700e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.305e-08 2.390e-09
25- 50 3.769e-08 6.200e-09
50-150 2.695e-08 7.730e-09
15-150 7.769e-08 1.215e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.1069 (-26.5128 51.0208)
Norm : 7.44764 (-1.1875 1.48115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.99 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.158255e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.937e-08 3.225e-09
25- 50 3.217e-08 4.215e-09
50-150 4.658e-08 2.335e-08
15-150 9.812e-08 2.499e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.37433 (-1.53684 2.19945)
R1^2/D10^2 : 10.5403 (-8.29674 30.1885)
kT2 [keV] : 16.1753 (-3.33691 5.94991)
R2^2/D10^2 : 0.103121 (-0.0750551 0.1007)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.98 using 59 PHA bins.
# Reduced chi-squared = 1.254 for 55 degrees of freedom
# Null hypothesis probability = 9.737815e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.011e-08 9.370e-09
25- 50 3.037e-08 1.241e-08
50-150 4.354e-08 2.239e-08
15-150 9.401e-08 4.014e-08
Plot creation:
Wed Apr 13 01:32:21 EDT 2016