batgrbproduct Analysis for Trigger=686845
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): Fri May 20 04:11:24 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger686845/GCN5_download_cron
======================================================================
Trigger: 00686845 Segment: 000
BAT Trigger Time: 485331376 [s; MET]
Trigger Stop: 485331440 [s; MET]
UTC: 2016-05-19T06:15:59.710480 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 320.760610417157 Dec: -5.68930996312992 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.87
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.87
Flight Position: [ source = BAT ]
RA: 320.760610417157 Dec: -5.68930996312992 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 320.760114821509 Dec: -5.61587840309152 [deg; J2000]
{ 21h 23m 02.4s , -05d 36' 57.2" }
+/- 6.08321485124191 [arcmin] (estimated 90% radius based on SNR)
+/- 4.56601170338553 [arcmin] (formal 1-sigma fit error)
SNR: 2.30636563235885
Angular difference between Flight and Ground position is 4.405993 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.154711 0.281459 0.060994 -0.074984
0.068029 0.070313 0.064288 0.065131 [error]
Peak 0.154711 0.281459 0.060994 -0.074984
0.068029 0.070313 0.064288 0.065131 [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 5.35e-08 7.88e-08 8.67e-08 1.79e-07 2.74e-07 3.88e-07 erg/cm2
Error 2.84e-08 3.32e-08 5.18e-08 2.29e-07 1.31e-07 2.72e-07 erg/cm2
Peak flux Power-law 2.77e-02 2.21e-02 1.19e-02 9.31e-03 6.58e-02 7.13e-02 ph/cm2/s
Error 1.46e-02 9.28e-03 7.06e-03 1.17e-02 2.77e-02 3.04e-02 ph/cm2/s
Fluence Cutoff-PL 3.03e-08 1.46e-07 3.93e-08 7.71e-11 2.16e-07 2.16e-07 erg/cm2
Error 3.33e-08 5.38e-08 5.57e-08 7.54e-09 8.79e-08 8.78e-08 erg/cm2
Peak flux Cutoff-PL 1.42e-02 4.03e-02 6.56e-03 6.94e-06 6.10e-02 6.10e-02 ph/cm2/s
Error 1.63e-02 1.47e-02 8.43e-03 6.20e-04 2.47e-02 2.47e-02 ph/cm2/s
Fluence Band 3.71e-08 1.39e-07 5.08e-08 7.90e-10 2.26e-07 2.27e-07 erg/cm2
Error 2.47e-08 4.87e-08 -------- -------- -------- -------- erg/cm2
Peak flux Band 1.77e-02 3.87e-02 7.84e-03 5.80e-05 6.44e-02 6.44e-02 ph/cm2/s
Error -------- 1.33e-02 -------- 3.10e-03 -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.911 0.638 - - 4.57e-04 2.23e-04 60.540 57
CPL -6.671 -0.159 38.3 8.4 5.82e+01 3.47e+03 52.640 56
The chi2 of BB fit is 54.15 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 1.911 0.638 - - 4.57e-04 2.23e-04 60.540 57
CPL -6.671 -0.159 38.3 8.4 5.82e+01 3.47e+03 52.640 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
320.7601 -5.6159 0.0836 38.1 -14.3 0.3545 2.3 TRIG_00686845
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [sec])
Background time interval of the image:
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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91120 ( -0.562631 0.713923 )
Norm@50keV : 4.56550E-04 ( -0.000218026 0.000228137 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.493761e-01
Photon flux (15-150 keV) in 64 sec: 6.57553E-02 ( -0.0276292 0.0276874 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73638e-07 ( -1.24724e-07 1.3727e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.67138 ( 8.18461 7.86714 )
Epeak [keV] : 38.2727 ( -6.84014 10.0068 )
Norm@50keV : 58.2394 ( -56.9051 6883.65 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.64 using 59 PHA bins.
# Reduced chi-squared = 0.9400 for 56 degrees of freedom
# Null hypothesis probability = 6.028778e-01
Photon flux (15-150 keV) in 64 sec: 6.10263E-02 ( -0.0235592 0.0258559 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15986e-07 ( -8.01466e-08 9.56218e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94125 ( -4.5716 -4.94125 )
beta : -6.29031 ( 6.29031 15.6158 )
Epeak [keV] : 38.5917 ( -8.39846 8.75433 )
Norm@50keV : 5.75328 ( -1.96851 22.5927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9581 for 55 degrees of freedom
# Null hypothesis probability = 5.632266e-01
Photon flux (15-150 keV) in 64 sec: 6.43744E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26453e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.2741 (-2.5836 3.66404)
R^2/D10^2 : 3.44494E-02 (-0.0344113 0.0675818)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9499 for 57 degrees of freedom
# Null hypothesis probability = 5.828266e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.781e-08 2.912e-08
25- 50 1.234e-07 7.840e-08
50-150 6.963e-08 5.331e-08
15-150 2.409e-07 1.525e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 62.8704 (-37.518 -65.2707)
Norm : 0.358612 (-0.166649 0.256805)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.172971e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.810e-08 3.571e-08
25- 50 8.968e-08 5.626e-08
50-150 1.060e-07 9.661e-08
15-150 2.538e-07 1.872e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.234575 (-0.234575 -0.234575)
R1^2/D10^2 : 6.20629E-03 (-0.00620628 -0.00620628)
kT2 [keV] : 10.2777 (-2.58245 3.66519)
R2^2/D10^2 : 3.44063E-02 (-0.0242042 0.0675874)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9845 for 55 degrees of freedom
# Null hypothesis probability = 5.072353e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.91120 ( -0.562631 0.713923 )
Norm@50keV : 4.56550E-04 ( -0.000218026 0.000228137 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.54 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 57 degrees of freedom
# Null hypothesis probability = 3.493761e-01
Photon flux (15-150 keV) in 64 sec: 6.57553E-02 ( -0.0276292 0.0276874 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.73638e-07 ( -1.24724e-07 1.3727e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.67138 ( 8.18461 7.86714 )
Epeak [keV] : 38.2727 ( -6.84014 10.0068 )
Norm@50keV : 58.2394 ( -56.9051 6883.54 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.64 using 59 PHA bins.
# Reduced chi-squared = 0.9400 for 56 degrees of freedom
# Null hypothesis probability = 6.028778e-01
Photon flux (15-150 keV) in 64 sec: 6.10263E-02 ( -0.0235592 0.0258559 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.15986e-07 ( -8.01466e-08 9.56218e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94125 ( -4.5716 -4.94125 )
beta : -6.29031 ( 6.29031 15.6158 )
Epeak [keV] : 38.5917 ( -8.39846 8.75433 )
Norm@50keV : 5.75328 ( -1.96851 22.5927 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.69 using 59 PHA bins.
# Reduced chi-squared = 0.9581 for 55 degrees of freedom
# Null hypothesis probability = 5.632266e-01
Photon flux (15-150 keV) in 64 sec: 6.43744E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.26453e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.2741 (-2.5836 3.66404)
R^2/D10^2 : 3.44494E-02 (-0.0344113 0.0675818)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9499 for 57 degrees of freedom
# Null hypothesis probability = 5.828266e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.781e-08 3.053e-08
25- 50 1.234e-07 7.456e-08
50-150 6.963e-08 5.315e-08
15-150 2.409e-07 1.544e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 62.8704 (-37.518 -65.2707)
Norm : 0.358612 (-0.166649 0.256805)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.58 using 59 PHA bins.
# Reduced chi-squared = 1.028 for 57 degrees of freedom
# Null hypothesis probability = 4.172971e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.810e-08 3.731e-08
25- 50 8.968e-08 5.789e-08
50-150 1.060e-07 9.408e-08
15-150 2.538e-07 1.790e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.234575 (-0.234575 -0.234575)
R1^2/D10^2 : 6.20629E-03 (-0.00620628 -0.00620628)
kT2 [keV] : 10.2777 (-2.58245 3.66519)
R2^2/D10^2 : 3.44063E-02 (-0.0242042 0.0675874)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.15 using 59 PHA bins.
# Reduced chi-squared = 0.9845 for 55 degrees of freedom
# Null hypothesis probability = 5.072353e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Fri May 20 04:15:55 EDT 2016