batgrbproduct analysis for trigger=876016
batgrbproduct Analysis for Trigger=876016
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 Dec 14 20:34:26 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger876016/GCN5_download_cron
======================================================================
Trigger: 00876016 Segment: 000
BAT Trigger Time: 566398680.512 [s; MET]
Trigger Stop: 566398696.896 [s; MET]
UTC: 2018-12-13T12:57:38.436940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 248.207112628901 Dec: 78.5044118700811 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.3
Image Trigger?: NO
Rate S/N Ratio: 13.7840487520902 [ if not an image trigger ]
Image S/N Ratio: 11.3
Flight Position: [ source = BAT ]
RA: 248.207112628901 Dec: 78.5044118700811 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 248.210477401933 Dec: 78.5002265854685 [deg; J2000]
{ 16h 32m 50.5s , +78d 30' 00.8" }
+/- 1.91730887848378 [arcmin] (estimated 90% radius based on SNR)
+/- 0.846030345284173 [arcmin] (formal 1-sigma fit error)
SNR: 12.0025229930761
Angular difference between Flight and Ground position is 0.254321 arcmin
Partial Coding Fraction: 0.2128906 [ including projection effects ]
Duration
T90: 15.3120000362396 +/- 1.24175349095536
Measured from: 0.0240001678466797
to: 15.3360002040863 [s; relative to TRIGTIME]
T50: 11.1519999504089 +/- 2.78464351532585
Measured from: 2.0880001783371
to: 13.240000128746 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.16400003433228
to: 2.16400003433228 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.695999979972839
to: 15.944000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.528163 0.833072 0.581924 0.167630
0.078262 0.082257 0.075920 0.067423 [error]
Peak 0.074643 0.092869 0.054258 0.038497
0.019054 0.021881 0.021253 0.016259 [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 2.13e-07 3.75e-07 5.06e-07 1.40e-06 1.47e-06 2.50e-06 erg/cm2
Error 4.10e-08 4.43e-08 7.47e-08 4.44e-07 1.81e-07 5.01e-07 erg/cm2
Peak flux Power-law 7.76e-01 7.01e-01 4.37e-01 4.15e-01 2.09e+00 2.33e+00 ph/cm2/s
Error 3.17e-01 1.95e-01 1.57e-01 2.86e-01 5.74e-01 6.38e-01 ph/cm2/s
Fluence Cutoff-PL 2.11e-07 3.78e-07 5.09e-07 1.23e-06 1.46e-06 2.31e-06 erg/cm2
Error 4.51e-08 5.08e-08 7.85e-08 9.31e-07 1.91e-07 7.54e-07 erg/cm2
Peak flux Cutoff-PL 7.09e-01 7.74e-01 4.63e-01 1.84e-01 2.07e+00 2.13e+00 ph/cm2/s
Error 3.57e-01 2.68e-01 1.88e-01 2.55e-01 5.78e-01 6.95e-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 1.569 0.197 - - 9.40e-03 1.08e-03 43.830 57
CPL 1.502 1.064 341.5 0.0 1.02e-02 1.21e-02 43.810 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.682 0.443 - - 1.58e-02 4.60e-03 48.930 57
CPL 0.924 2.239 66.4 0.0 4.09e-02 9.96e-01 48.410 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: 5.632000 sec.
T50 in the 50-300 keV band: 3.328000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.640 -0.696 15.944
T90 15.312 0.024 15.336
T50 11.152 2.088 13.240
Peak 1.000 1.164 2.164
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
248.2105 +78.5002 0.0160 47.6 -148.2 1.9845 12.0 TRIG_00876016
------------------------------------------
Foreground time interval of the image:
-0.696 15.944 (delta_t = 16.640 [sec])
Background time interval of the image:
-239.512 -0.696 (delta_t = 238.816 [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 -0.696 sec. to 15.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.56921 ( -0.195639 0.197645 )
Norm@50keV : 9.40006E-03 ( -0.00107909 0.00107272 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.83 using 59 PHA bins.
# Reduced chi-squared = 0.7689 for 57 degrees of freedom
# Null hypothesis probability = 8.997741e-01
Photon flux (15-150 keV) in 16.64 sec: 1.19672 ( -0.138608 0.139088 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46861e-06 ( -1.79952e-07 1.81306e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.696 sec. to 15.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50176 ( -0.810457 1.31724 )
Epeak [keV] : 341.488 ( -390.69 -390.69 )
Norm@50keV : 1.01809E-02 ( -0.00838532 0.0157323 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.81 using 59 PHA bins.
# Reduced chi-squared = 0.7824 for 56 degrees of freedom
# Null hypothesis probability = 8.816266e-01
Photon flux (15-150 keV) in 16.64 sec: 1.19363 ( -0.14262 0.1406 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.463e-06 ( -1.96736e-07 1.85707e-07 ) ergs/cm2
Band function
Time interval is from -0.696 sec. to 15.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.92974 ( -4.92974 -4.92974 )
beta : -1.62382 ( -0.26243 0.212716 )
Epeak [keV] : 23.0840 ( -23.084 6.74111 )
Norm@50keV : 1525.17 ( -169.658 5.68746e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.10 using 59 PHA bins.
# Reduced chi-squared = 0.7837 for 55 degrees of freedom
# Null hypothesis probability = 8.776526e-01
Photon flux (15-150 keV) in 16.64 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] : 13.7197 (-1.88329 2.29644)
R^2/D10^2 : 0.181466 (-0.0776819 0.128353)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.54 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.299805e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.203e-07 2.543e-08
25- 50 4.383e-07 6.698e-08
50-150 5.375e-07 1.364e-07
15-150 1.096e-06 1.554e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.070 (-85.1354 -199.098)
Norm : 4.86107 (-0.541109 0.643369)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.05 using 59 PHA bins.
# Reduced chi-squared = 0.7727 for 57 degrees of freedom
# Null hypothesis probability = 8.954297e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.015e-07 1.117e-07
25- 50 3.875e-07 2.123e-07
50-150 8.494e-07 4.662e-07
15-150 1.438e-06 7.900e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.19429 (-2.19409 2.1855)
R1^2/D10^2 : 0.608429 (-0.304319 0.516268)
kT2 [keV] : 49.5970 (-23.0112 -49.597)
R2^2/D10^2 : 1.83259E-03 (-0.00172672 0.0109727)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.21 using 59 PHA bins.
# Reduced chi-squared = 0.7675 for 55 degrees of freedom
# Null hypothesis probability = 8.969014e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.767e-07 6.524e-08
25- 50 4.294e-07 1.444e-07
50-150 8.714e-07 4.479e-07
15-150 1.477e-06 5.740e-07
Peak spectrum fit
Power-law model
Time interval is from 1.164 sec. to 2.164 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68249 ( -0.425329 0.460207 )
Norm@50keV : 1.58284E-02 ( -0.00466773 0.00454066 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.93 using 59 PHA bins.
# Reduced chi-squared = 0.8583 for 57 degrees of freedom
# Null hypothesis probability = 7.678956e-01
Photon flux (15-150 keV) in 1 sec: 2.08950 ( -0.573469 0.574264 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46762e-07 ( -4.41753e-08 4.49466e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.164 sec. to 2.164 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.923676 ( -2.99258 1.48455 )
Epeak [keV] : 66.3641 ( -66.431 -66.431 )
Norm@50keV : 4.09421E-02 ( -0.0408473 1.95188 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.41 using 59 PHA bins.
# Reduced chi-squared = 0.8644 for 56 degrees of freedom
# Null hypothesis probability = 7.545680e-01
Photon flux (15-150 keV) in 1 sec: 2.06830 ( -0.57858 0.57731 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40998e-07 ( -4.81617e-08 4.7565e-08 ) ergs/cm2
Band function
Time interval is from 1.164 sec. to 2.164 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95188 ( -4.95188 -4.95188 )
beta : -1.86303 ( -0.972571 0.505423 )
Epeak [keV] : 25.5246 ( -25.5246 12.3512 )
Norm@50keV : 1674.19 ( -447.27 1.56352e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.83 using 59 PHA bins.
# Reduced chi-squared = 0.8696 for 55 degrees of freedom
# Null hypothesis probability = 7.426953e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.41877e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.3038 (-3.39559 4.72314)
R^2/D10^2 : 0.494777 (-0.346676 1.08306)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.54 using 59 PHA bins.
# Reduced chi-squared = 0.8867 for 57 degrees of freedom
# Null hypothesis probability = 7.144059e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.587e-08 9.157e-09
25- 50 5.141e-08 2.732e-08
50-150 4.757e-08 3.165e-08
15-150 1.148e-07 5.477e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 138.730 (-84.0392 -135.941)
Norm : 8.77901 (-2.58476 3.89515)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.50 using 59 PHA bins.
# Reduced chi-squared = 0.8508 for 57 degrees of freedom
# Null hypothesis probability = 7.812798e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.268e-08 1.354e-08
25- 50 4.156e-08 2.412e-08
50-150 7.934e-08 5.080e-08
15-150 1.436e-07 8.985e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.58269 (-9.0493 5.39836)
R1^2/D10^2 : 1.37686 (-1.18492 -1.18492)
kT2 [keV] : 30.6282 (-39.6932 -39.6932)
R2^2/D10^2 : 9.69630E-03 (-0.00424966 0.617411)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.06 using 59 PHA bins.
# Reduced chi-squared = 0.8737 for 55 degrees of freedom
# Null hypothesis probability = 7.349950e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.063e-08 1.248e-08
25- 50 4.662e-08 2.829e-08
50-150 6.990e-08 4.460e-08
15-150 1.372e-07 7.830e-08
Plot creation:
Fri Dec 14 20:40:37 EST 2018