batgrbproduct analysis for trigger=878548
batgrbproduct Analysis for Trigger=878548
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): Mon Dec 24 03:38:21 EST 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger878548/GCN5_download_cron
======================================================================
Trigger: 00878548 Segment: 000
BAT Trigger Time: 567226064 [s; MET]
Trigger Stop: 567226168 [s; MET]
UTC: 2018-12-23T02:47:21.873160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 247.818270329542 Dec: -47.8175494276217 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 15.07
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.07
Flight Position: [ source = BAT ]
RA: 247.818270329542 Dec: -47.8175494276217 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 247.787793408484 Dec: -47.8146885983607 [deg; J2000]
{ 16h 31m 09.1s , -47d 48' 52.9" }
+/- 1.10223707490276 [arcmin] (estimated 90% radius based on SNR)
+/- 0.559560113972941 [arcmin] (formal 1-sigma fit error)
SNR: 26.4682666718539
Angular difference between Flight and Ground position is 1.239877 arcmin
Partial Coding Fraction: 0.84375 [ including projection effects ]
Duration
T90: 769.471999883652 +/- 26.3494288032499
Measured from: -0.243999838829041
to: 769.228000044823 [s; relative to TRIGTIME]
T50: 412.46799993515 +/- 26.8040329185498
Measured from: 183.852000117302
to: 596.320000052452 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 804.324000000954
to: 805.324000000954 [s; relative to TRIGTIME]
Total Fluence
Measured from: -42.6920000314713
to: 813.496000051498 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.408760 7.981544 3.364726 0.499026
0.219496 0.216088 0.184406 0.165902 [error]
Peak 0.043292 0.018857 0.018311 0.012171
0.014277 0.013694 0.011973 0.010241 [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 2.52e-06 3.15e-06 2.86e-06 4.51e-06 1.01e-05 1.30e-05 erg/cm2
Error 1.57e-07 1.19e-07 1.83e-07 5.97e-07 4.14e-07 7.67e-07 erg/cm2
Peak flux Power-law 2.99e-01 2.30e-01 1.18e-01 8.74e-02 6.87e-01 7.35e-01 ph/cm2/s
Error 2.68e-01 1.20e-01 1.14e-01 2.02e-01 3.22e-01 3.58e-01 ph/cm2/s
Fluence Cutoff-PL 2.30e-06 3.34e-06 2.76e-06 1.55e-06 9.35e-06 9.94e-06 erg/cm2
Error 1.88e-07 1.52e-07 2.12e-07 7.70e-07 5.19e-07 9.54e-07 erg/cm2
Peak flux Cutoff-PL 3.19e-01 2.27e-01 1.06e-01 6.99e-02 6.86e-01 7.21e-01 ph/cm2/s
Error 2.14e-01 1.21e-01 1.15e-01 2.03e-01 3.22e-01 3.59e-01 ph/cm2/s
Fluence Band 2.21e-06 3.38e-06 2.66e-06 3.08e-06 9.48e-06 1.14e-05 erg/cm2
Error 2.07e-07 1.62e-07 2.12e-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 2.140 0.078 - - 1.26e-03 5.72e-05 58.330 57
CPL 1.437 0.364 34.5 8.0 3.08e-03 1.49e-03 45.300 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.958 1.478 - - 4.67e-03 3.78e-03 41.020 57
CPL 3.691 1.589 426.9 0.0 7.53e-04 0.00e+00 39.620 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 856.188 -42.692 813.496
T90 769.472 -0.244 769.228
T50 412.468 183.852 596.320
Peak 1.000 804.324 805.324
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
247.7878 -47.8147 0.0073 20.0 -54.1 18.1961 26.5 TRIG_00878548
------------------------------------------
Foreground time interval of the image:
-13.499 737.601 (delta_t = 751.100 [sec])
Background time interval of the image:
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 -42.692 sec. to 813.496 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13980 ( -0.0775817 0.0787854 )
Norm@50keV : 1.26056E-03 ( -5.7404e-05 5.69848e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.33 using 59 PHA bins.
# Reduced chi-squared = 1.023 for 57 degrees of freedom
# Null hypothesis probability = 4.261817e-01
Photon flux (15-150 keV) in 856.2 sec: 0.202306 ( -0.00817821 0.00820566 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.007e-05 ( -4.12878e-07 4.1504e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -42.692 sec. to 813.496 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.43721 ( -0.380612 0.347205 )
Epeak [keV] : 34.4604 ( -10.2441 5.67646 )
Norm@50keV : 3.07660E-03 ( -0.00108107 0.00190499 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.30 using 59 PHA bins.
# Reduced chi-squared = 0.8090 for 56 degrees of freedom
# Null hypothesis probability = 8.460054e-01
Photon flux (15-150 keV) in 856.2 sec: 0.192704 ( -0.009256 0.009289 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.35347e-06 ( -5.13378e-07 5.24337e-07 ) ergs/cm2
Band function
Time interval is from -42.692 sec. to 813.496 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43715 ( -0.199072 0.261805 )
beta : -10.00000 ( 10 2.89207e-09 )
Epeak [keV] : 34.4539 ( -4.09453 5.67019 )
Norm@50keV : 3.07635E-03 ( -0.00108238 0.000818693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.30 using 59 PHA bins.
# Reduced chi-squared = 0.8237 for 55 degrees of freedom
# Null hypothesis probability = 8.214418e-01
Photon flux (15-150 keV) in 856.2 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 9.48122e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.0358 ( )
R^2/D10^2 : 8.55646E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.90 using 59 PHA bins.
# Reduced chi-squared = 2.4894 for 57 degrees of freedom
# Null hypothesis probability = 3.442573e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.505e-06 9.204e-08
25- 50 3.760e-06 1.537e-07
50-150 1.983e-06 2.123e-07
15-150 7.247e-06 3.005e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.4782 (-6.25384 7.19299)
Norm : 1.05833 (-0.0779485 0.075961)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.44 using 59 PHA bins.
# Reduced chi-squared = 0.7971 for 57 degrees of freedom
# Null hypothesis probability = 8.649220e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.254e-06 1.404e-07
25- 50 3.365e-06 1.306e-07
50-150 3.637e-06 3.575e-07
15-150 9.256e-06 4.153e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.23906 (-0.852766 0.843982)
R1^2/D10^2 : 0.395806 (-0.13952 0.271675)
kT2 [keV] : 18.6902 (-2.90969 4.29639)
R2^2/D10^2 : 4.85194E-03 (-0.00282557 0.00543115)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.12 using 59 PHA bins.
# Reduced chi-squared = 0.8386 for 55 degrees of freedom
# Null hypothesis probability = 7.974294e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.137e-06 3.044e-07
25- 50 3.370e-06 4.452e-07
50-150 3.705e-06 8.904e-07
15-150 9.212e-06 1.318e-06
Peak spectrum fit
Power-law model
Time interval is from 804.324 sec. to 805.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95783 ( -1.16222 1.79337 )
Norm@50keV : 4.67110E-03 ( -0.00466742 0.00288625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.02 using 59 PHA bins.
# Reduced chi-squared = 0.7196 for 57 degrees of freedom
# Null hypothesis probability = 9.453217e-01
Photon flux (15-150 keV) in 1 sec: 0.687430 ( -0.322319 0.322224 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29741e-08 ( -4.29741e-08 2.93306e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 804.324 sec. to 805.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.69057 ( -2.81657 0.361583 )
Epeak [keV] : 426.940 ( )
Norm@50keV : 7.52772E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.62 using 59 PHA bins.
# Reduced chi-squared = 0.7074 for 56 degrees of freedom
# Null hypothesis probability = 9.522448e-01
Photon flux (15-150 keV) in 1 sec: 0.685888 ( -0.32192 0.322102 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.19775e-08 ( -2.54445e-08 3.03529e-08 ) ergs/cm2
Band function
Time interval is from 804.324 sec. to 805.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.45188 ( 1.45806 1.45806 )
beta : -1.92307 ( 1.93634 1.14094 )
Epeak [keV] : 19.9698 ( -13.8936 -13.8936 )
Norm@50keV : 1.25492E-02 ( -0.0137399 1.01349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.02 using 59 PHA bins.
# Reduced chi-squared = 0.7459 for 55 degrees of freedom
# Null hypothesis probability = 9.193447e-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] : 5.26900 (-2.72166 37.774)
R^2/D10^2 : 3.80346 (-3.77988 154.609)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.71 using 59 PHA bins.
# Reduced chi-squared = 0.7668 for 57 degrees of freedom
# Null hypothesis probability = 9.021032e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.136e-08 7.150e-09
25- 50 8.421e-09 5.925e-09
50-150 4.385e-10 5.400e-10
15-150 2.021e-08 1.358e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.668 (-199.668 -199.668)
Norm : 2.65054 (-1.28363 22.8835)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.80 using 59 PHA bins.
# Reduced chi-squared = 0.7333 for 57 degrees of freedom
# Null hypothesis probability = 9.345399e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.686e-09 5.015e-09
25- 50 1.326e-08 8.840e-09
50-150 2.132e-08 1.853e-08
15-150 4.226e-08 3.009e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.11366 (-2.27716 3.82483)
R1^2/D10^2 : 10.5193 (-10.0326 1413.61)
kT2 [keV] : 38.4075 (-24.0581 -38.5021)
R2^2/D10^2 : 2.92626E-03 (-0.00286881 0.0496085)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.91 using 59 PHA bins.
# Reduced chi-squared = 0.7074 for 55 degrees of freedom
# Null hypothesis probability = 9.506072e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.151e-08 7.590e-09
25- 50 8.139e-09 4.817e-09
50-150 3.515e-08 2.374e-08
15-150 5.480e-08 2.920e-08
Plot creation:
Mon Dec 24 03:42:53 EST 2018