batgrbproduct Analysis for Trigger=680331
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 Mar 25 11:06:53 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger680331/GCN5_download_cron
======================================================================
Trigger: 00680331 Segment: 000
BAT Trigger Time: 480482816 [s; MET]
Trigger Stop: 480482880 [s; MET]
UTC: 2016-03-24T03:26:39.976780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 186.675637822863 Dec: -62.7595410701143 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 26.78
Flight Position: [ source = BAT ]
RA: 186.675637822863 Dec: -62.7595410701143 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 186.822359849699 Dec: -62.6756576045783 [deg; J2000]
{ 12h 27m 17.4s , -62d 40' 32.4" }
+/- 2.06377360872707 [arcmin] (estimated 90% radius based on SNR)
+/- 1.12371244690692 [arcmin] (formal 1-sigma fit error)
SNR: 10.8044125658946
Angular difference between Flight and Ground position is 6.450912 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 656 +/- 16
Measured from: -158.999999880791
to: 497.000000119209 [s; relative to TRIGTIME]
T50: 400 +/- 16
Measured from: -46.9999998807907
to: 353.000000119209 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 376.5
to: 377.5 [s; relative to TRIGTIME]
Total Fluence
Measured from: -191
to: 929 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 77.188358 23.919171 0.658795 0.107304
0.220073 0.192154 0.149103 0.127202 [error]
Peak 0.109077 0.036378 0.003060 0.001784
0.007013 0.006064 0.004402 0.003761 [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 3.14e-05 7.79e-06 1.01e-06 1.47e-07 4.03e-05 4.03e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 1.03e+00 3.06e-01 4.98e-02 9.31e-03 1.39e+00 1.39e+00 ph/cm2/s
Error 1.32e-01 5.59e-02 1.94e-02 6.17e-03 1.66e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 2.50e-05 8.96e-06 1.23e-07 5.18e-12 3.41e-05 3.41e-05 erg/cm2
Error 1.70e-06 2.45e-07 3.16e-08 8.49e-12 1.74e-06 1.74e-06 erg/cm2
Peak flux Cutoff-PL 1.07e+00 2.97e-01 1.67e-03 7.18e-09 1.37e+00 1.37e+00 ph/cm2/s
Error 1.46e-01 7.57e-02 5.19e-03 4.64e-06 1.63e-01 1.63e-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 4.945 0.000 - - 7.66e-04 0.00e+00 404.670 57
CPL 1.000 0.000 50.0 0.0 2.58e-03 0.00e+00 2889.290 56
The chi2 of BB fit is 81.32 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 3.620 0.338 - - 3.12e-03 9.69e-04 69.000 57
CPL 1.000 0.000 50.0 0.0 1.78e-02 0.00e+00 169.950 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 1120.000 -191.000 929.000
T90 656.000 -159.000 497.000
T50 400.000 -47.000 353.000
Peak 1.000 376.500 377.500
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
186.8224 -62.6757 0.0177 12.7 173.1 21.0043 10.8 TRIG_00680331
------------------------------------------
Foreground time interval of the image:
-191.000 -81.510 (delta_t = 109.490 [sec])
-80.000 73.801 (delta_t = 153.801 [sec])
Background time interval of the image:
-192.799 -191.000 (delta_t = 1.799 [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
Multiple GTIs in the spectrum
tstart tstop
-191.000000 -81.510000
-80.000000 253.380000
254.000000 436.430000
438.000000 929.000000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.94492 ( )
Norm@50keV : 7.66328E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 404.67 using 59 PHA bins.
# Reduced chi-squared = 7.0995 for 57 degrees of freedom
# Null hypothesis probability = 7.055323e-54
Photon flux (15-150 keV) in 1116 sec: 1.12216 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.02689e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-191.000000 -81.510000
-80.000000 253.380000
254.000000 436.430000
438.000000 929.000000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.58057E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 2889.29 using 59 PHA bins.
# Reduced chi-squared = 51.5944 for 56 degrees of freedom
# Null hypothesis probability = 0.000000e+00
Photon flux (15-150 keV) in 1116 sec: 0.911187 ( -0.054473 0.054599 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.40692e-05 ( -1.7404e-06 1.7404e-06 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-191.000000 -81.510000
-80.000000 253.380000
254.000000 436.430000
438.000000 929.000000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76318 ( )
beta : -7.22880 ( )
Epeak [keV] : 2.04752 ( )
Norm@50keV : 0.148302 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 137.87 using 59 PHA bins.
# Reduced chi-squared = 2.5067 for 55 degrees of freedom
# Null hypothesis probability = 4.641082e-09
Photon flux (15-150 keV) in 1116 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] : 4.01842 (-0.07246 0.0746105)
R^2/D10^2 : 23.6801 (-3.03147 3.4442)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.32 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.889419e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.458e-05 1.278e-06
25- 50 8.990e-06 2.606e-07
50-150 1.123e-07 1.300e-08
15-150 3.368e-05 1.456e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.84292 ( )
Norm : 62.4053 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 123.85 using 59 PHA bins.
# Reduced chi-squared = 2.1728 for 57 degrees of freedom
# Null hypothesis probability = 7.417860e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.884e-05 1.362e-06
25- 50 8.676e-06 2.483e-07
50-150 2.863e-07 2.896e-08
15-150 3.780e-05 1.367e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.89567 (-0.108614 0.0968853)
R1^2/D10^2 : 28.6883 (-4.4704 5.06111)
kT2 [keV] : 14.9828 (-5.38724 9.8539)
R2^2/D10^2 : 1.75537E-03 (-0.00152455 0.0139285)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.15 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 55 degrees of freedom
# Null hypothesis probability = 2.646843e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.567e-05 1.484e-06
25- 50 8.925e-06 3.939e-07
50-150 6.466e-07 3.374e-07
15-150 3.525e-05 1.758e-06
Peak spectrum fit
Power-law model
Time interval is from 376.500 sec. to 377.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.62023 ( -0.319607 0.357046 )
Norm@50keV : 3.11665E-03 ( -0.000911561 0.00102614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.00 using 59 PHA bins.
# Reduced chi-squared = 1.211 for 57 degrees of freedom
# Null hypothesis probability = 1.324260e-01
Photon flux (15-150 keV) in 1 sec: 1.39103 ( -0.165938 0.166006 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.28854e-08 ( -7.24388e-09 7.48895e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 376.500 sec. to 377.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.78375E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 169.95 using 59 PHA bins.
# Reduced chi-squared = 3.0348 for 56 degrees of freedom
# Null hypothesis probability = 2.054497e-13
Photon flux (15-150 keV) in 1 sec: 1.36974 ( -0.16344 0.16312 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.72126e-08 ( -5.8591e-09 6.0144e-09 ) ergs/cm2
Band function
Time interval is from 376.500 sec. to 377.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.40753 ( )
beta : -8.22035 ( )
Epeak [keV] : 44.0448 ( )
Norm@50keV : 1.29511E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 157.13 using 59 PHA bins.
# Reduced chi-squared = 2.8568 for 55 degrees of freedom
# Null hypothesis probability = 9.104843e-12
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] : 4.36914 (-0.425477 0.464861)
R^2/D10^2 : 23.7528 (-9.66004 16.8784)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.41 using 59 PHA bins.
# Reduced chi-squared = 0.9721 for 57 degrees of freedom
# Null hypothesis probability = 5.349832e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.261e-08 6.455e-09
25- 50 1.504e-08 4.237e-09
50-150 3.044e-10 1.830e-10
15-150 4.795e-08 8.415e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.2159 (-1.9553 2.56182)
Norm : 39.3242 (-12.0124 18.3434)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 57 degrees of freedom
# Null hypothesis probability = 3.603829e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.198e-08 5.785e-09
25- 50 1.595e-08 4.145e-09
50-150 1.475e-09 8.988e-10
15-150 4.941e-08 9.270e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.35549 (-4.35528 0.458322)
R1^2/D10^2 : 24.0671 (-9.59252 16.5082)
kT2 [keV] : 199.101 (-199.239 -199.239)
R2^2/D10^2 : 1.54750E-05 (-1.56214e-05 38.7278)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.96 using 59 PHA bins.
# Reduced chi-squared = 0.9992 for 55 degrees of freedom
# Null hypothesis probability = 4.763125e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.260e-08 6.900e-09
25- 50 1.507e-08 4.048e-09
50-150 4.387e-09 2.230e-10
15-150 5.205e-08 9.825e-09
Plot creation:
Fri Mar 25 11:12:37 EDT 2016