batgrbproduct analysis for trigger=852903
batgrbproduct Analysis for Trigger=852903
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 Aug 13 13:27:22 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger852903/GCN5_download_cron
======================================================================
Trigger: 00852903 Segment: 000
BAT Trigger Time: 555754971.648 [s; MET]
Trigger Stop: 555754973.696 [s; MET]
UTC: 2018-08-12T08:22:30.233000 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.885624105366 Dec: 74.6697837972354 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.57
Image Trigger?: NO
Rate S/N Ratio: 11.2249721603218 [ if not an image trigger ]
Image S/N Ratio: 7.57
Flight Position: [ source = BAT ]
RA: 245.885624105366 Dec: 74.6697837972354 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.838632643973 Dec: 74.6741584691027 [deg; J2000]
{ 16h 23m 21.3s , +74d 40' 27.0" }
+/- 2.28367306827267 [arcmin] (estimated 90% radius based on SNR)
+/- 1.41205053405144 [arcmin] (formal 1-sigma fit error)
SNR: 9.34940975525431
Angular difference between Flight and Ground position is 0.790186 arcmin
Partial Coding Fraction: 0.2617188 [ including projection effects ]
Duration
T90: 16.5080000162125 +/- 0.915895229907026
Measured from: -0.0639998912811279
to: 16.4440001249313 [s; relative to TRIGTIME]
T50: 10.9959999322891 +/- 2.73414922172781
Measured from: 1.4520001411438
to: 12.4480000734329 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 15.62399995327
to: 16.62399995327 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.299999952316284
to: 16.6280000209808 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.182204 0.408467 0.328630 0.116329
0.056941 0.060080 0.054953 0.051366 [error]
Peak 0.045986 0.096078 0.055927 0.032868
0.015658 0.016190 0.015655 0.012643 [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 7.83e-08 1.71e-07 2.94e-07 1.17e-06 8.04e-07 1.71e-06 erg/cm2
Error 2.34e-08 3.08e-08 5.29e-08 4.74e-07 1.35e-07 5.05e-07 erg/cm2
Peak flux Power-law 5.32e-01 6.00e-01 4.85e-01 6.52e-01 1.86e+00 2.27e+00 ph/cm2/s
Error 2.03e-01 1.46e-01 1.20e-01 3.29e-01 4.10e-01 4.99e-01 ph/cm2/s
Fluence Cutoff-PL 6.81e-08 1.81e-07 3.11e-07 5.02e-07 7.72e-07 1.06e-06 erg/cm2
Error 2.92e-08 3.71e-08 6.27e-08 7.97e-07 1.52e-07 5.22e-07 erg/cm2
Peak flux Cutoff-PL 4.56e-01 6.56e-01 5.22e-01 2.64e-01 1.80e+00 1.90e+00 ph/cm2/s
Error 2.42e-01 1.90e-01 1.45e-01 4.70e-01 3.20e-01 6.41e-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 1.219 0.270 - - 4.71e-03 7.29e-04 63.610 57
CPL 0.557 1.270 117.1 -33.4 9.68e-03 2.59e-02 62.780 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.308 0.352 - - 1.55e-02 3.33e-03 61.410 57
CPL 0.417 2.336 89.0 -11.9 4.40e-02 6.15e-01 60.570 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 16.928 -0.300 16.628
T90 16.508 -0.064 16.444
T50 10.996 1.452 12.448
Peak 1.000 15.624 16.624
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.8386 +74.6742 0.0206 38.4 139.1 1.1241 9.3 TRIG_00852903
------------------------------------------
Foreground time interval of the image:
-0.300 16.628 (delta_t = 16.928 [sec])
Background time interval of the image:
-239.648 -0.300 (delta_t = 239.348 [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 -0.300 sec. to 16.628 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.21916 ( -0.27372 0.265973 )
Norm@50keV : 4.70889E-03 ( -0.000729439 0.000728531 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.61 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 57 degrees of freedom
# Null hypothesis probability = 2.550877e-01
Photon flux (15-150 keV) in 16.93 sec: 0.554262 ( -0.0894286 0.0898666 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.04497e-07 ( -1.34232e-07 1.35431e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.300 sec. to 16.628 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.556575 ( -1.66705 0.872155 )
Epeak [keV] : 117.119 ( -50.3276 -117.106 )
Norm@50keV : 9.68210E-03 ( -0.00555137 0.0461837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.78 using 59 PHA bins.
# Reduced chi-squared = 1.121 for 56 degrees of freedom
# Null hypothesis probability = 2.484967e-01
Photon flux (15-150 keV) in 16.93 sec: 0.537922 ( -0.096328 0.095024 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.71542e-07 ( -1.54515e-07 1.49815e-07 ) ergs/cm2
Band function
Time interval is from -0.300 sec. to 16.628 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.187263 ( 0.359076 5.22118 )
beta : -1.73009 ( 1.65479 0.630521 )
Epeak [keV] : 88.4954 ( -86.9768 160.45 )
Norm@50keV : 1.50053E-02 ( -0.00968561 180111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.27 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 55 degrees of freedom
# Null hypothesis probability = 2.333641e-01
Photon flux (15-150 keV) in 16.93 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] : 17.9243 (-2.99614 3.96615)
R^2/D10^2 : 3.68910E-02 (-0.0181603 0.032057)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.45 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.835558e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.023e-08 1.380e-08
25- 50 1.855e-07 4.707e-08
50-150 4.321e-07 1.297e-07
15-150 6.577e-07 1.564e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-54.1104 -200)
Norm : 2.32360 (-0.365441 0.365441)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.43 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 57 degrees of freedom
# Null hypothesis probability = 1.624867e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.801e-08 5.628e-08
25- 50 1.885e-07 1.062e-07
50-150 4.135e-07 2.313e-07
15-150 7.000e-07 3.973e-07
Double BB
R1^2/D10^2 : 7.25651E-02 (-1563.44 -1563.82)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 6.17570E-05 (-4.46439e-05 0.000574232)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.90 using 59 PHA bins.
#Fit statistic : Chi-Squared = 61.68 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Reduced chi-squared = 1.125 for 55 degrees of freedom
# Reduced chi-squared = 1.122 for 55 degrees of freedom
# Null hypothesis probability = 2.097783e-01
# Null hypothesis probability = 2.434774e-01
# Null hypothesis probability = 2.494529e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.773e-08 1.602e-08
25- 50 1.739e-07 4.767e-08
50-150 4.500e-07 1.468e-07
15-150 6.816e-07 1.737e-07
Peak spectrum fit
Power-law model
Time interval is from 15.624 sec. to 16.624 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.30763 ( -0.355103 0.349674 )
Norm@50keV : 1.55272E-02 ( -0.00333049 0.00332451 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.41 using 59 PHA bins.
# Reduced chi-squared = 1.077 for 57 degrees of freedom
# Null hypothesis probability = 3.208454e-01
Photon flux (15-150 keV) in 1 sec: 1.85506 ( -0.40868 0.410406 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.53154e-07 ( -3.54551e-08 3.58915e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.624 sec. to 16.624 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.416513 ( -2.77954 1.89157 )
Epeak [keV] : 89.0011 ( -65.2435 -88.9672 )
Norm@50keV : 4.39844E-02 ( -0.0440216 1.18614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.57 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 56 degrees of freedom
# Null hypothesis probability = 3.144907e-01
Photon flux (15-150 keV) in 1 sec: 1.80414 ( -0.217 0.42281 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.43894e-07 ( -4.3556e-08 4.0399e-08 ) ergs/cm2
Band function
Time interval is from 15.624 sec. to 16.624 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.79355 ( -4.79355 -4.79355 )
beta : -1.90487 ( -0.945212 0.615494 )
Epeak [keV] : 41.5729 ( -41.5729 9.90276 )
Norm@50keV : 58.4971 ( -12.2736 5.17943e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.07 using 59 PHA bins.
# Reduced chi-squared = 1.074 for 55 degrees of freedom
# Null hypothesis probability = 3.292175e-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] : 15.3770 (-3.33977 4.79038)
R^2/D10^2 : 0.208040 (-0.126998 0.277908)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.30 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.932584e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.025e-08 4.054e-09
25- 50 4.167e-08 1.500e-08
50-150 6.779e-08 3.086e-08
15-150 1.197e-07 4.566e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.356 (-88.9911 -199.361)
Norm : 7.75110 (-1.66788 1.67252)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.22 using 59 PHA bins.
# Reduced chi-squared = 1.092 for 57 degrees of freedom
# Null hypothesis probability = 2.956761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.930e-08 1.131e-08
25- 50 3.713e-08 2.191e-08
50-150 8.143e-08 4.692e-08
15-150 1.379e-07 7.905e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 12.2967 (-3.99594 4.5077)
R1^2/D10^2 : 0.386847 (-0.232474 0.725412)
kT2 [keV] : 197.962 (-198.079 -198.079)
R2^2/D10^2 : 2.04541E-04 (-0.000130498 0.0423131)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.07 using 59 PHA bins.
#Fit statistic : Chi-Squared = 57.89 using 59 PHA bins.
# Reduced chi-squared = 1.056 for 55 degrees of freedom
# Reduced chi-squared = 1.053 for 55 degrees of freedom
# Null hypothesis probability = 3.630489e-01
# Null hypothesis probability = 3.691629e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.295e-08 7.795e-09
25- 50 4.224e-08 2.522e-08
50-150 9.240e-08 4.931e-08
15-150 1.476e-07 7.695e-08
Plot creation:
Mon Aug 13 13:31:24 EDT 2018