batgrbproduct Analysis for Trigger=728268
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): Sun Dec 25 18:55:34 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger728268/GCN5_download_cron
======================================================================
Trigger: 00728268 Segment: 000
BAT Trigger Time: 504310432 [s; MET]
Trigger Stop: 504310496 [s; MET]
UTC: 2016-12-24T22:13:34.642820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 204.824756188297 Dec: -18.0284612983687 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.73
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.73
Flight Position: [ source = BAT ]
RA: 204.824756188297 Dec: -18.0284612983687 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 204.8204556627 Dec: -18.0282465255399 [deg; J2000]
{ 13h 39m 16.9s , -18d 01' 41.7" }
+/- 1.85902777287648 [arcmin] (estimated 90% radius based on SNR)
+/- 0.946151042365303 [arcmin] (formal 1-sigma fit error)
SNR: 12.543659850621
Angular difference between Flight and Ground position is 0.245701 arcmin
Partial Coding Fraction: 0.4804688 [ including projection effects ]
Duration
T90: 47.0400000214577 +/- 12.1185082276141
Measured from: 15.8640001416206
to: 62.9040001630783 [s; relative to TRIGTIME]
T50: 17.6160000562668 +/- 5.17535080559601
Measured from: 30.7280001044273
to: 48.3440001606941 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 32.8759999871254
to: 33.8759999871254 [s; relative to TRIGTIME]
Total Fluence
Measured from: 12.4559999704361
to: 65.1759999990463 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.610669 0.846651 0.226692 0.031007
0.070997 0.072889 0.062048 0.052581 [error]
Peak 0.023437 0.038720 0.019130 0.020257
0.010016 0.010163 0.008720 0.007269 [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 2.55e-07 3.06e-07 2.65e-07 3.92e-07 9.65e-07 1.22e-06 erg/cm2
Error 3.88e-08 3.68e-08 5.51e-08 1.54e-07 1.32e-07 2.27e-07 erg/cm2
Peak flux Power-law 2.90e-01 2.67e-01 1.70e-01 1.66e-01 7.96e-01 8.93e-01 ph/cm2/s
Error 1.52e-01 9.01e-02 6.64e-02 1.31e-01 2.61e-01 2.79e-01 ph/cm2/s
Fluence Cutoff-PL 2.20e-07 3.92e-07 1.97e-07 1.64e-08 8.25e-07 8.26e-07 erg/cm2
Error 4.49e-08 5.69e-08 7.98e-08 3.92e-08 1.26e-07 1.30e-07 erg/cm2
Peak flux Cutoff-PL 2.94e-01 2.68e-01 1.69e-01 1.63e-01 7.98e-01 8.97e-01 ph/cm2/s
Error 1.55e-01 1.04e-01 7.13e-02 1.63e-01 2.60e-01 2.78e-01 ph/cm2/s
Fluence Band 2.17e-07 3.93e-07 1.96e-07 6.57e-08 8.48e-07 8.75e-07 erg/cm2
Error 4.50e-08 5.65e-08 -------- -------- 1.36e-07 2.03e-07 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 2.207 0.210 - - 1.94e-03 3.02e-04 57.660 57
CPL -0.209 1.557 34.5 5.6 5.76e-02 4.12e-01 44.840 56
The chi2 of BB fit is 46.62 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 1.653 0.547 - - 6.09e-03 1.96e-03 54.080 57
CPL 2.069 1.704 28.0 0.0 3.50e-03 0.00e+00 54.060 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 52.720 12.456 65.176
T90 47.040 15.864 62.904
T50 17.616 30.728 48.344
Peak 1.000 32.876 33.876
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
204.8205 -18.0282 0.0153 44.0 -13.3 1.8185 12.5 TRIG_00728268
------------------------------------------
Foreground time interval of the image:
12.456 65.176 (delta_t = 52.720 [sec])
Background time interval of the image:
-239.000 12.456 (delta_t = 251.456 [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 12.456 sec. to 65.176 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20711 ( -0.202989 0.217585 )
Norm@50keV : 1.94416E-03 ( -0.000304085 0.000299146 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.66 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.505066e-01
Photon flux (15-150 keV) in 52.72 sec: 0.323072 ( -0.0378792 0.0378898 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.64644e-07 ( -1.30939e-07 1.33704e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 12.456 sec. to 65.176 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.209382 ( -1.80505 1.30889 )
Epeak [keV] : 34.5006 ( -5.71224 5.39047 )
Norm@50keV : 5.75623E-02 ( -0.0617375 0.762515 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.84 using 59 PHA bins.
# Reduced chi-squared = 0.8007 for 56 degrees of freedom
# Null hypothesis probability = 8.577381e-01
Photon flux (15-150 keV) in 52.72 sec: 0.305621 ( -0.038212 0.038427 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.2501e-07 ( -1.18631e-07 1.32875e-07 ) ergs/cm2
Band function
Time interval is from 12.456 sec. to 65.176 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.563722 ( -1.25179 -0.181727 )
beta : -3.88620 ( 9.37167 19.3704 )
Epeak [keV] : 33.9737 ( -5.90692 5.28993 )
Norm@50keV : 9.95428E-02 ( -0.097534 75.3145 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.50 using 59 PHA bins.
# Reduced chi-squared = 0.8090 for 55 degrees of freedom
# Null hypothesis probability = 8.434771e-01
Photon flux (15-150 keV) in 52.72 sec: 0.307289 ( 6.69271 -0.038519 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.48418e-07 ( -8.48049e-07 -1.27725e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.90504 (-0.957988 1.07062)
R^2/D10^2 : 0.246369 (-0.0902156 0.141611)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.62 using 59 PHA bins.
# Reduced chi-squared = 0.8179 for 57 degrees of freedom
# Null hypothesis probability = 8.351280e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.994e-07 3.722e-08
25- 50 4.169e-07 6.213e-08
50-150 1.539e-07 5.343e-08
15-150 7.702e-07 1.123e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 45.5638 (-10.8367 16.164)
Norm : 1.97241 (-0.354178 0.456849)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.87 using 59 PHA bins.
# Reduced chi-squared = 0.8573 for 57 degrees of freedom
# Null hypothesis probability = 7.697537e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.484e-07 3.912e-08
25- 50 3.447e-07 5.190e-08
50-150 3.057e-07 1.051e-07
15-150 8.988e-07 1.405e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 16.7865 (-16.7641 -16.7641)
R1^2/D10^2 : 6.55365E-03 (-0.00662497 0.301061)
kT2 [keV] : 7.51023 (-7.50473 1.97847)
R2^2/D10^2 : 0.384479 (-0.385066 -0.385066)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.67 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.57 using 59 PHA bins.
# Reduced chi-squared = 0.8121 for 55 degrees of freedom
# Reduced chi-squared = 0.8103 for 55 degrees of freedom
# Null hypothesis probability = 8.389015e-01
# Null hypothesis probability = 8.415766e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.196e-07 1.326e-07
25- 50 3.905e-07 2.533e-07
50-150 2.207e-07 1.371e-07
15-150 8.309e-07 5.364e-07
Peak spectrum fit
Power-law model
Time interval is from 32.876 sec. to 33.876 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65269 ( -0.540198 0.553169 )
Norm@50keV : 6.09184E-03 ( -0.00197924 0.00193799 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.08 using 59 PHA bins.
# Reduced chi-squared = 0.9487 for 57 degrees of freedom
# Null hypothesis probability = 5.853785e-01
Photon flux (15-150 keV) in 1 sec: 0.796152 ( -0.260278 0.261809 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66412e-08 ( -1.88304e-08 1.90144e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 32.876 sec. to 33.876 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.06851 ( -3.29158 0.116318 )
Epeak [keV] : 28.0410 ( )
Norm@50keV : 3.50313E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.06 using 59 PHA bins.
# Reduced chi-squared = 0.9653 for 56 degrees of freedom
# Null hypothesis probability = 5.487478e-01
Photon flux (15-150 keV) in 1 sec: 0.797865 ( -0.262259 0.258245 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.66531e-08 ( -1.01704e-08 1.89931e-08 ) ergs/cm2
Band function
Time interval is from 32.876 sec. to 33.876 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93894 ( -4.93894 -4.93894 )
beta : -1.86960 ( -1.38023 0.673122 )
Epeak [keV] : 28.7345 ( -28.7345 15.5146 )
Norm@50keV : 289.057 ( -89.8463 7.68652e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.88 using 59 PHA bins.
# Reduced chi-squared = 0.9796 for 55 degrees of freedom
# Null hypothesis probability = 5.175954e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.15682e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.9567 (-3.81966 7.31302)
R^2/D10^2 : 0.200338 (-0.199072 0.639378)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.11 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.711120e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.056e-09 3.844e-09
25- 50 1.898e-08 1.184e-08
50-150 1.627e-08 1.151e-08
15-150 4.131e-08 2.583e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 165.010 (-109.431 -159.383)
Norm : 3.22317 (-1.07865 1.79684)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.21 using 59 PHA bins.
# Reduced chi-squared = 0.9510 for 57 degrees of freedom
# Null hypothesis probability = 5.804711e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.009e-09 4.945e-09
25- 50 1.533e-08 9.070e-09
50-150 3.316e-08 1.929e-08
15-150 5.650e-08 3.327e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.24126 (-4.17895 4.59041)
R1^2/D10^2 : 0.454241 (-0.356725 2.93103)
kT2 [keV] : 89.2741 (-89.2743 -89.2744)
R2^2/D10^2 : 2.97571E-04 (-0.000274665 0.0424329)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.87 using 59 PHA bins.
# Reduced chi-squared = 0.9612 for 55 degrees of freedom
# Null hypothesis probability = 5.566179e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.812e-09 4.993e-09
25- 50 1.821e-08 1.145e-08
50-150 3.061e-08 1.690e-08
15-150 5.664e-08 2.908e-08
Plot creation:
Sun Dec 25 19:09:11 EST 2016