batgrbproduct Analysis for Trigger=720568
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Nov 4 15:23:12 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger720568/batgroup_hand_proc
======================================================================
Trigger: 00720568 Segment: 000
BAT Trigger Time: 499945363.984 [s; MET]
Trigger Stop: 499945364.048 [s; MET]
UTC: 2016-11-04T09:42:26.875480 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 77.8806169009489 Dec: -51.4523657373836 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.2
Image Trigger?: NO
Rate S/N Ratio: 27.258026340878 [ if not an image trigger ]
Image S/N Ratio: 9.2
Flight Position: [ source = BAT ]
RA: 77.8806169009489 Dec: -51.4523657373836 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 77.9055913923341 Dec: -51.4471488984059 [deg; J2000]
{ 05h 11m 37.3s , -51d 26' 49.7" }
+/- 1.80101400232936 [arcmin] (estimated 90% radius based on SNR)
+/- 0.932004932569109 [arcmin] (formal 1-sigma fit error)
SNR: 13.1248384543953
Angular difference between Flight and Ground position is 0.984909 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 0.0999999642372131 +/- 0.0199999928474746
Measured from: -0.0120000243186951
to: 0.0879999399185181 [s; relative to TRIGTIME]
T50: 0.043999969959259 +/- 0.0178885267601734
Measured from: 0.0119999647140503
to: 0.0559999346733093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.456000030040741
to: 0.543999969959259 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0160000324249268
to: 0.0999999642372131 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.013073 0.022678 0.022852 0.008036
0.002461 0.002923 0.002804 0.001984 [error]
Peak 0.017627 0.027761 0.021339 0.003329
0.005620 0.005945 0.005162 0.004221 [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 4.51e-09 7.95e-09 1.07e-08 2.96e-08 3.11e-08 5.28e-08 erg/cm2
Error 9.29e-10 1.12e-09 1.84e-09 9.96e-09 4.61e-09 1.17e-08 erg/cm2
Peak flux Power-law 1.66e-01 1.87e-01 1.51e-01 2.02e-01 5.78e-01 7.06e-01 ph/cm2/s
Error 6.65e-02 4.59e-02 4.10e-02 1.17e-01 1.29e-01 1.64e-01 ph/cm2/s
Fluence Cutoff-PL 3.51e-09 9.70e-09 1.28e-08 6.78e-09 3.08e-08 3.28e-08 erg/cm2
Error 1.18e-09 1.62e-09 2.53e-09 6.67e-09 4.55e-09 7.33e-09 erg/cm2
Peak flux Cutoff-PL 1.67e-01 1.87e-01 1.51e-01 2.00e-01 5.78e-01 7.04e-01 ph/cm2/s
Error 5.41e-02 4.84e-02 4.31e-02 1.69e-01 1.29e-01 1.88e-01 ph/cm2/s
Fluence Band 3.49e-09 9.65e-09 1.27e-08 1.11e-08 3.11e-08 3.69e-08 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 1.570 0.201 - - 2.85e-02 4.00e-03 85.010 57
CPL -0.038 1.217 65.7 21.1 1.84e-01 3.72e-01 78.720 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.313 0.397 - - 4.83e-03 1.07e-03 55.840 57
CPL 1.302 0.400 9999.0 0.0 4.86e-03 1.27e-02 55.840 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.116 -0.016 0.100
T90 0.100 -0.012 0.088
T50 0.044 0.012 0.056
Peak 1.000 -0.456 0.544
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
77.9056 -51.4471 0.0147 13.0218 -142.1309 0.0666273 13.125 TRIG_00720568
Foreground time interval of the image:
-0.016 0.100 (delta_t = 0.116 [sec])
Background time interval of the image:
-239.984 -0.016 (delta_t = 239.968 [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 -0.016 sec. to 0.100 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.57027 ( -0.198654 0.203761 )
Norm@50keV : 2.85368E-02 ( -0.00401312 0.00398873 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 85.01 using 59 PHA bins.
# Reduced chi-squared = 1.491 for 57 degrees of freedom
# Null hypothesis probability = 9.477596e-03
Photon flux (15-150 keV) in 0.116 sec: 3.63415 ( -0.505232 0.505476 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10757e-08 ( -4.60643e-09 4.62118e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.100 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.80028E-02 ( -1.32687 1.10628 )
Epeak [keV] : 65.7035 ( -10.2392 32.017 )
Norm@50keV : 0.183525 ( -0.183604 0.559458 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.72 using 59 PHA bins.
# Reduced chi-squared = 1.406 for 56 degrees of freedom
# Null hypothesis probability = 2.432701e-02
Photon flux (15-150 keV) in 0.116 sec: 3.62271 ( -0.51367 0.5108 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.07981e-08 ( -4.5247e-09 4.56831e-09 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.100 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.30797E-02 ( -1.38144 1.13844 )
beta : -3.01786 ( 2.9845 1.08431 )
Epeak [keV] : 66.7401 ( -14.0446 20.0426 )
Norm@50keV : 0.161925 ( -0.0899012 0.666132 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.59 using 59 PHA bins.
# Reduced chi-squared = 1.429 for 55 degrees of freedom
# Null hypothesis probability = 2.009077e-02
Photon flux (15-150 keV) in 0.116 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.10628e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.7083 (-1.72594 1.87416)
R^2/D10^2 : 0.409528 (-0.14202 0.21091)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.41 using 59 PHA bins.
# Reduced chi-squared = 1.428 for 57 degrees of freedom
# Null hypothesis probability = 1.859806e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.433e-09 5.580e-10
25- 50 1.008e-08 1.805e-09
50-150 1.726e-08 4.112e-09
15-150 2.977e-08 4.924e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 177.505 (-71.8872 -178.006)
Norm : 15.2835 (-2.166 2.40806)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.59 using 59 PHA bins.
# Reduced chi-squared = 1.449 for 57 degrees of freedom
# Null hypothesis probability = 1.499003e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.426e-09 2.467e-09
25- 50 8.443e-09 4.594e-09
50-150 1.807e-08 9.959e-09
15-150 3.094e-08 1.683e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.56467 (-1.68382 3.71476)
R1^2/D10^2 : 218.567 (-215.992 1.34565e+06)
kT2 [keV] : 16.7427 (-2.01046 2.61553)
R2^2/D10^2 : 0.307350 (-0.145841 0.152833)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.09 using 59 PHA bins.
# Reduced chi-squared = 1.365 for 55 degrees of freedom
# Null hypothesis probability = 3.721172e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.715e-09 1.282e-09
25- 50 9.068e-09 2.342e-09
50-150 1.779e-08 4.205e-09
15-150 3.057e-08 6.397e-09
Peak spectrum fit
Power-law model
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.31282 ( -0.398782 0.394289 )
Norm@50keV : 4.83453E-03 ( -0.00107628 0.00107036 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.84 using 59 PHA bins.
# Reduced chi-squared = 0.9796 for 57 degrees of freedom
# Null hypothesis probability = 5.187629e-01
Photon flux (15-150 keV) in 1 sec: 0.578156 ( -0.129095 0.129332 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.76262e-08 ( -1.18766e-08 1.20897e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30213 ( -0.39851 0.401033 )
Epeak [keV] : 9999.02 ( -9999.36 -9999.36 )
Norm@50keV : 4.85595E-03 ( -0.0010829 0.0242687 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.84 using 59 PHA bins.
# Reduced chi-squared = 0.9971 for 56 degrees of freedom
# Null hypothesis probability = 4.808729e-01
Photon flux (15-150 keV) in 1 sec: 0.578143 ( -0.129201 0.129085 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75232e-08 ( -1.20359e-08 1.21168e-08 ) ergs/cm2
Band function
Time interval is from -0.456 sec. to 0.544 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06230 ( 1.06282 1.06282 )
beta : -1.31281 ( 1.31281 0.399195 )
Epeak [keV] : 43.2378 ( -43.0402 -43.0402 )
Norm@50keV : 8.96511E-03 ( -0.00519545 0.793641 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.84 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.431567e-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] : 16.6437 (-4.31217 6.55705)
R^2/D10^2 : 4.74411E-02 (-0.0318863 0.084119)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.39 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.214748e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.692e-09 1.458e-09
25- 50 1.171e-08 5.305e-09
50-150 2.299e-08 1.178e-08
15-150 3.739e-08 1.716e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-94.4361 -199.362)
Norm : 2.37624 (-0.527062 0.528303)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.08 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.722225e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.917e-09 3.523e-09
25- 50 1.138e-08 6.535e-09
50-150 2.496e-08 1.454e-08
15-150 4.226e-08 2.484e-08
Double BB
R1^2/D10^2 : 0.144044 (-0.103886 0.208245)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 8.62650E-05 (-6.04212e-05 0.000663541)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.09 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.53 using 59 PHA bins.
#Fit statistic : Chi-Squared = 56.44 using 59 PHA bins.
# Reduced chi-squared = 1.038 for 55 degrees of freedom
# Reduced chi-squared = 1.028 for 55 degrees of freedom
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 3.972516e-01
# Null hypothesis probability = 4.177096e-01
# Null hypothesis probability = 4.207356e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.031e-09 3.139e-09
25- 50 9.613e-09 5.060e-09
50-150 2.883e-08 1.811e-08
15-150 4.348e-08 2.401e-08
Plot creation:
Fri Nov 4 15:27:38 EDT 2016