batgrbproduct analysis for trigger=867252
batgrbproduct Analysis for Trigger=867252
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): Wed Oct 17 01:11:29 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger867252/GCN5_download_cron
======================================================================
Trigger: 00867252 Segment: 000
BAT Trigger Time: 561344122.688 [s; MET]
Trigger Stop: 561344139.072 [s; MET]
UTC: 2018-10-16T00:55:00.927600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 231.267907712346 Dec: -35.2789249317542 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.57
Image Trigger?: NO
Rate S/N Ratio: 7.28010988928052 [ if not an image trigger ]
Image S/N Ratio: 8.57
Flight Position: [ source = BAT ]
RA: 231.267907712346 Dec: -35.2789249317542 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 231.273386780453 Dec: -35.3065461076005 [deg; J2000]
{ 15h 25m 05.6s , -35d 18' 23.6" }
+/- 1.82441360649246 [arcmin] (estimated 90% radius based on SNR)
+/- 0.88462270747218 [arcmin] (formal 1-sigma fit error)
SNR: 12.8850198110162
Angular difference between Flight and Ground position is 1.678852 arcmin
Partial Coding Fraction: 0.5078125 [ including projection effects ]
Duration
T90: 111.603999972343 +/- 26.3256872736196
Measured from: -12.9519999027252
to: 98.6520000696182 [s; relative to TRIGTIME]
T50: 50.9639999866486 +/- 11.8716759510994
Measured from: 0.784000158309937
to: 51.7480001449585 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.392000079154968
to: 1.39200007915497 [s; relative to TRIGTIME]
Total Fluence
Measured from: -18.0039999485016
to: 110.136000037193 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.748281 1.102460 0.792549 0.332488
0.115228 0.115199 0.097468 0.083031 [error]
Peak 0.028759 0.035396 0.015165 0.013338
0.010803 0.010371 0.009158 0.007471 [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 4.67e-07 6.57e-07 1.94e-06 1.88e-06 3.32e-06 erg/cm2
Error 5.14e-08 5.69e-08 9.76e-08 6.29e-07 2.37e-07 6.99e-07 erg/cm2
Peak flux Power-law 2.93e-01 2.20e-01 1.10e-01 7.92e-02 6.61e-01 7.03e-01 ph/cm2/s
Error 1.56e-01 8.93e-02 6.58e-02 9.96e-02 2.68e-01 2.86e-01 ph/cm2/s
Fluence Cutoff-PL 2.55e-07 4.67e-07 6.57e-07 1.92e-06 1.88e-06 3.30e-06 erg/cm2
Error 5.30e-08 6.02e-08 9.87e-08 7.94e-07 2.41e-07 8.72e-07 erg/cm2
Peak flux Cutoff-PL 2.27e-01 3.01e-01 9.69e-02 4.11e-03 6.29e-01 6.29e-01 ph/cm2/s
Error 1.76e-01 1.25e-01 9.36e-02 4.33e-02 2.59e-01 2.60e-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 1.507 0.203 - - 1.55e-03 1.79e-04 50.300 57
CPL 1.509 0.280 9999.4 0.0 1.55e-03 1.36e-03 50.310 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.991 0.678 - - 4.42e-03 2.12e-03 70.800 57
CPL -0.849 4.366 40.0 0.0 2.11e-01 0.00e+00 68.010 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: 62.592000 sec.
T50 in the 50-300 keV band: 34.176000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 128.140 -18.004 110.136
T90 111.604 -12.952 98.652
T50 50.964 0.784 51.748
Peak 1.000 0.392 1.392
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
231.2734 -35.3065 0.0150 34.6 -44.1 3.3352 12.9 TRIG_00867252
------------------------------------------
Foreground time interval of the image:
-18.004 110.136 (delta_t = 128.140 [sec])
Background time interval of the image:
-236.487 -18.004 (delta_t = 218.483 [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 -18.004 sec. to 110.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50699 ( -0.203263 0.202959 )
Norm@50keV : 1.54928E-03 ( -0.000179731 0.000178917 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.30 using 59 PHA bins.
# Reduced chi-squared = 0.8825 for 57 degrees of freedom
# Null hypothesis probability = 7.225725e-01
Photon flux (15-150 keV) in 128.1 sec: 0.193776 ( -0.0228713 0.0229427 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.88058e-06 ( -2.35805e-07 2.37797e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -18.004 sec. to 110.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50855 ( -0.358246 0.201283 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 1.55143E-03 ( -0.000909266 0.00182057 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.31 using 59 PHA bins.
# Reduced chi-squared = 0.8983 for 56 degrees of freedom
# Null hypothesis probability = 6.892345e-01
Photon flux (15-150 keV) in 128.1 sec: 0.193907 ( -0.023065 0.02273 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.87974e-06 ( -2.44645e-07 2.36754e-07 ) ergs/cm2
Band function
Time interval is from -18.004 sec. to 110.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94628 ( -4.94628 -4.94628 )
beta : -1.59813 ( -0.292751 0.231821 )
Epeak [keV] : 24.6351 ( -24.6351 6.4853 )
Norm@50keV : 166.707 ( -18.8752 800414 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.06 using 59 PHA bins.
# Reduced chi-squared = 0.8920 for 55 degrees of freedom
# Null hypothesis probability = 6.997821e-01
Photon flux (15-150 keV) in 128.1 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] : 14.9449 (-2.30581 2.83436)
R^2/D10^2 : 2.15912E-02 (-0.00984734 0.0177451)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.21 using 59 PHA bins.
# Reduced chi-squared = 1.320 for 57 degrees of freedom
# Null hypothesis probability = 5.338273e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.294e-07 2.912e-08
25- 50 5.125e-07 9.069e-08
50-150 7.777e-07 1.936e-07
15-150 1.419e-06 2.362e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.358 (-72.0239 -199.362)
Norm : 0.793096 (-0.0901834 0.0903475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.18 using 59 PHA bins.
# Reduced chi-squared = 0.8979 for 57 degrees of freedom
# Null hypothesis probability = 6.920066e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.530e-07 1.399e-07
25- 50 4.867e-07 2.652e-07
50-150 1.067e-06 5.874e-07
15-150 1.807e-06 9.838e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.94875 (-1.77306 2.62283)
R1^2/D10^2 : 0.236128 (-0.153732 0.263191)
kT2 [keV] : 31.3102 (-9.78 48.9069)
R2^2/D10^2 : 1.37111E-03 (-0.0012475 0.00357516)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.30 using 59 PHA bins.
# Reduced chi-squared = 0.8964 for 55 degrees of freedom
# Null hypothesis probability = 6.910820e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.591e-07 1.296e-07
25- 50 4.789e-07 1.873e-07
50-150 1.170e-06 6.238e-07
15-150 1.908e-06 8.951e-07
Peak spectrum fit
Power-law model
Time interval is from 0.392 sec. to 1.392 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99061 ( -0.62947 0.726817 )
Norm@50keV : 4.42338E-03 ( -0.00213918 0.00209854 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.80 using 59 PHA bins.
# Reduced chi-squared = 1.242 for 57 degrees of freedom
# Null hypothesis probability = 1.034180e-01
Photon flux (15-150 keV) in 1 sec: 0.660815 ( -0.267874 0.26854 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.06749e-08 ( -1.81e-08 1.94443e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.392 sec. to 1.392 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.849250 ( -5.83871 2.8937 )
Epeak [keV] : 39.9666 ( )
Norm@50keV : 0.210706 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.01 using 59 PHA bins.
# Reduced chi-squared = 1.214 for 56 degrees of freedom
# Null hypothesis probability = 1.304540e-01
Photon flux (15-150 keV) in 1 sec: 0.629239 ( -0.255131 0.262803 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.47784e-08 ( -1.44998e-08 1.78606e-08 ) ergs/cm2
Band function
Time interval is from 0.392 sec. to 1.392 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.15156 ( -4.37174 -1.59245 )
beta : -9.99659 ( 9.96079 19.9596 )
Epeak [keV] : 39.3961 ( -15.0271 68.3748 )
Norm@50keV : 0.321354 ( -0.326797 1426.49 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.01 using 59 PHA bins.
# Reduced chi-squared = 1.237 for 55 degrees of freedom
# Null hypothesis probability = 1.118137e-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] : 10.3184 (-3.36697 4.53646)
R^2/D10^2 : 0.304935 (-0.304935 1.07178)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.06 using 59 PHA bins.
# Reduced chi-squared = 1.194 for 57 degrees of freedom
# Null hypothesis probability = 1.497615e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.678e-09 4.134e-09
25- 50 1.735e-08 1.093e-08
50-150 9.905e-09 7.895e-09
15-150 3.393e-08 2.164e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.8631 (-32.9877 -57.0595)
Norm : 3.70277 (-1.77963 3.19474)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.46 using 59 PHA bins.
# Reduced chi-squared = 1.219 for 57 degrees of freedom
# Null hypothesis probability = 1.245725e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.220e-09 6.030e-09
25- 50 1.380e-08 8.675e-09
50-150 1.500e-08 1.317e-08
15-150 3.802e-08 2.644e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.49353 (-5.74313 189.381)
R1^2/D10^2 : 0.706920 (-0.733566 -0.733566)
kT2 [keV] : 11.6037 (-11.5741 -11.5741)
R2^2/D10^2 : 0.166010 (-0.163099 1.1574)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.06 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.95 using 59 PHA bins.
# Reduced chi-squared = 1.238 for 55 degrees of freedom
# Reduced chi-squared = 1.235 for 55 degrees of freedom
# Null hypothesis probability = 1.110037e-01
# Null hypothesis probability = 1.128433e-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:
Wed Oct 17 01:15:18 EDT 2018