batgrbproduct Analysis for Trigger=679120
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 Mar 15 07:40:35 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger679120/GCN5_download_cron
======================================================================
Trigger: 00679120 Segment: 000
BAT Trigger Time: 479647987.776 [s; MET]
Trigger Stop: 479647989.824 [s; MET]
UTC: 2016-03-14T11:32:51.798460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 112.780775633225 Dec: 17.00092392601 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.54
Image Trigger?: NO
Rate S/N Ratio: 14.1774468787578 [ if not an image trigger ]
Image S/N Ratio: 8.54
Flight Position: [ source = BAT ]
RA: 112.780775633225 Dec: 17.00092392601 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 112.766273740931 Dec: 17.0244976156565 [deg; J2000]
{ 07h 31m 03.9s , +17d 01' 28.2" }
+/- 1.72468703625798 [arcmin] (estimated 90% radius based on SNR)
+/- 0.823325450759448 [arcmin] (formal 1-sigma fit error)
SNR: 13.9624236091419
Angular difference between Flight and Ground position is 1.640998 arcmin
Partial Coding Fraction: 0.75 [ including projection effects ]
Duration
T90: 8.73199993371964 +/- 1.51832540543486
Measured from: 0.256000101566315
to: 8.98800003528595 [s; relative to TRIGTIME]
T50: 3.11199992895126 +/- 1.42902061948255
Measured from: 1.38000011444092
to: 4.49200004339218 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.12000000476837
to: 2.12000000476837 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0360000133514404
to: 9.31199997663498 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.140256 0.166362 0.116187 0.051970
0.018960 0.019377 0.016590 0.013449 [error]
Peak 0.036230 0.040701 0.027108 0.016106
0.006665 0.006595 0.005719 0.004545 [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 3.81e-08 6.89e-08 9.55e-08 2.76e-07 2.75e-07 4.79e-07 erg/cm2
Error 7.82e-09 8.68e-09 1.64e-08 1.02e-07 3.92e-08 1.15e-07 erg/cm2
Peak flux Power-law 3.00e-01 3.02e-01 2.13e-01 2.38e-01 9.08e-01 1.05e+00 ph/cm2/s
Error 9.10e-02 5.39e-02 4.87e-02 1.17e-01 1.54e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 3.82e-08 6.90e-08 9.54e-08 2.72e-07 2.74e-07 4.75e-07 erg/cm2
Error 7.96e-09 7.12e-09 1.64e-08 1.66e-07 4.00e-08 1.27e-07 erg/cm2
Peak flux Cutoff-PL 3.00e-01 3.02e-01 2.12e-01 2.36e-01 9.08e-01 1.05e+00 ph/cm2/s
Error 9.10e-02 -------- -------- -------- 1.54e-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 1.528 0.222 - - 3.11e-03 4.01e-04 62.890 57
CPL 1.533 0.223 9999.4 0.0 3.11e-03 0.00e+00 62.890 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.504 0.327 - - 7.27e-03 1.27e-03 68.810 57
CPL 1.511 0.337 9999.3 0.0 7.28e-03 2.76e-03 68.830 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: 8.960000 sec.
T50 in the 50-300 keV band: 4.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 9.348 -0.036 9.312
T90 8.732 0.256 8.988
T50 3.112 1.380 4.492
Peak 1.000 1.120 2.120
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
112.7663 +17.0245 0.0138 19.7 61.5 0.4850 14.0 TRIG_00679120
------------------------------------------
Foreground time interval of the image:
-0.036 9.312 (delta_t = 9.348 [sec])
Background time interval of the image:
-239.776 -171.146 (delta_t = 68.630 [sec])
-169.776 -0.036 (delta_t = 169.740 [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 -0.036 sec. to 9.312 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.52811 ( -0.220256 0.222824 )
Norm@50keV : 3.11226E-03 ( -0.000403272 0.000398235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.89 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 57 degrees of freedom
# Null hypothesis probability = 2.757998e-01
Photon flux (15-150 keV) in 9.348 sec: 0.391543 ( -0.0484341 0.0484902 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74773e-07 ( -3.88985e-08 3.9489e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.036 sec. to 9.312 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53276 ( -0.226301 0.219759 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 3.11078E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.89 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 56 degrees of freedom
# Null hypothesis probability = 2.455297e-01
Photon flux (15-150 keV) in 9.348 sec: 0.391399 ( -0.048394 0.048474 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74421e-07 ( -4.07021e-08 3.92896e-08 ) ergs/cm2
Band function
Time interval is from -0.036 sec. to 9.312 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97227 ( -4.97227 -4.97227 )
beta : -1.57944 ( -0.254343 0.238666 )
Epeak [keV] : 21.4657 ( -21.4657 7.37773 )
Norm@50keV : 839.163 ( -102.226 1.81872e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.40 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 55 degrees of freedom
# Null hypothesis probability = 2.298452e-01
Photon flux (15-150 keV) in 9.348 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] : 13.5729 (-2.08587 2.56408)
R^2/D10^2 : 6.15014E-02 (-0.0282664 0.0502949)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.88 using 59 PHA bins.
# Reduced chi-squared = 1.437 for 57 degrees of freedom
# Null hypothesis probability = 1.707088e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.243e-08 4.982e-09
25- 50 8.083e-08 1.290e-08
50-150 9.647e-08 2.877e-08
15-150 1.997e-07 3.524e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.354 (-87.1648 -199.359)
Norm : 1.59440 (-0.194803 0.195004)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.59 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.556904e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.711e-08 2.091e-08
25- 50 7.139e-08 3.957e-08
50-150 1.566e-07 8.624e-08
15-150 2.651e-07 1.477e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.82396 (-4.80154 2.27549)
R1^2/D10^2 : 0.168077 (-0.10328 1.76564)
kT2 [keV] : 200.000 (-181.259 -200)
R2^2/D10^2 : 5.26539E-05 (-1.64244e-05 0.000198987)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.06 using 59 PHA bins.
#Fit statistic : Chi-Squared = 64.02 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Reduced chi-squared = 1.164 for 55 degrees of freedom
# Null hypothesis probability = 1.884609e-01
# Null hypothesis probability = 1.894686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.233e-08 1.062e-08
25- 50 7.878e-08 2.721e-08
50-150 1.708e-07 1.200e-07
15-150 2.819e-07 1.583e-07
Peak spectrum fit
Power-law model
Time interval is from 1.120 sec. to 2.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50408 ( -0.327786 0.325346 )
Norm@50keV : 7.26826E-03 ( -0.00128574 0.00125801 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.81 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.357514e-01
Photon flux (15-150 keV) in 1 sec: 0.908363 ( -0.153921 0.154032 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.89062e-08 ( -1.34031e-08 1.36462e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.120 sec. to 2.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.51106 ( -0.355026 0.318947 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 7.27513E-03 ( -0.00128359 0.0042271 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.83 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 56 degrees of freedom
# Null hypothesis probability = 1.165162e-01
Photon flux (15-150 keV) in 1 sec: 0.908122 ( -0.15394 0.153928 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.83813e-08 ( -1.28158e-08 1.35978e-08 ) ergs/cm2
Band function
Time interval is from 1.120 sec. to 2.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.90643 ( -4.90643 -4.90643 )
beta : -1.59539 ( -0.454677 0.366312 )
Epeak [keV] : 22.9593 ( -22.9593 7.17278 )
Norm@50keV : 1142.81 ( -189.248 4.66087e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.17 using 59 PHA bins.
# Reduced chi-squared = 1.240 for 55 degrees of freedom
# Null hypothesis probability = 1.093185e-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] : 10.6599 (-2.64179 4.80483)
R^2/D10^2 : 0.321913 (-0.316927 0.608793)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 88.55 using 59 PHA bins.
# Reduced chi-squared = 1.553 for 57 degrees of freedom
# Null hypothesis probability = 4.692281e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.590e-09 2.707e-09
25- 50 2.060e-08 6.385e-09
50-150 1.290e-08 6.176e-09
15-150 4.109e-08 1.265e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.338 (-99.3619 -199.353)
Norm : 3.68047 (-0.617446 0.618411)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.83 using 59 PHA bins.
# Reduced chi-squared = 1.243 for 57 degrees of freedom
# Null hypothesis probability = 1.030846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.165e-09 5.300e-09
25- 50 1.763e-08 1.006e-08
50-150 3.866e-08 2.231e-08
15-150 6.546e-08 3.749e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.29247 (-1.41394 1.74875)
R1^2/D10^2 : 1.17459 (-0.836464 1.78339)
kT2 [keV] : 200.000 (-157.343 -200)
R2^2/D10^2 : 1.72937E-04 (-4.89523e-05 4.89326e-05)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.22 using 59 PHA bins.
#Fit statistic : Chi-Squared = 59.89 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Reduced chi-squared = 1.089 for 55 degrees of freedom
# Null hypothesis probability = 2.926982e-01
# Null hypothesis probability = 3.026886e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.079e-08 5.868e-09
25- 50 1.705e-08 8.394e-09
50-150 5.038e-08 4.830e-08
15-150 7.822e-08 5.323e-08
Plot creation:
Tue Mar 15 07:44:56 EDT 2016