batgrbproduct analysis for trigger=848890
batgrbproduct Analysis for Trigger=848890
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Jul 20 22:04:56 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger848890/batgroup_hand_proc
======================================================================
Trigger: 00848890 Segment: 000
BAT Trigger Time: 553789325.888 [s; MET]
Trigger Stop: 553789326.912 [s; MET]
UTC: 2018-07-20T14:21:44.593440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.52968200447337 Dec: -2.93344156841311 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.41
Image Trigger?: NO
Rate S/N Ratio: 135.970585054268 [ if not an image trigger ]
Image S/N Ratio: 12.41
Flight Position: [ source = BAT ]
RA: 0.52968200447337 Dec: -2.93344156841311 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 0.528571841222877 Dec: -2.92552612118528 [deg; J2000]
{ 00h 02m 06.9s , -02d 55' 31.9" }
+/- 1.16091989332408 [arcmin] (estimated 90% radius based on SNR)
+/- 0.41793099795083 [arcmin] (formal 1-sigma fit error)
SNR: 24.5778411209893
Angular difference between Flight and Ground position is 0.479563 arcmin
Partial Coding Fraction: 0.08496094 [ including projection effects ]
Duration
T90: 108.399999856949 +/- 3.6884533781446
Measured from: 0.220000028610229
to: 108.619999885559 [s; relative to TRIGTIME]
T50: 20.067999958992 +/- 1.06384957132124
Measured from: 8.28799998760223
to: 28.3559999465942 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 10.9359999895096
to: 11.9359999895096 [s; relative to TRIGTIME]
Total Fluence
Measured from: -3.81599998474121
to: 527.728000044823 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 27.985057 42.002746 38.493033 13.089993
0.287209 0.348442 0.353681 0.280679 [error]
Peak 1.265924 2.649425 3.050419 1.236563
0.064338 0.090272 0.105104 0.086043 [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 9.81e-06 1.97e-05 3.08e-05 1.06e-04 8.59e-05 1.67e-04 erg/cm2
Error 3.42e-07 3.99e-07 4.78e-07 4.01e-06 1.25e-06 4.08e-06 erg/cm2
Peak flux Power-law 1.54e+01 2.06e+01 2.02e+01 3.57e+01 6.79e+01 9.19e+01 ph/cm2/s
Error 1.14e+00 9.35e-01 8.39e-01 3.11e+00 2.58e+00 3.80e+00 ph/cm2/s
Fluence Cutoff-PL 9.81e-06 1.97e-05 3.09e-05 1.06e-04 8.59e-05 1.77e-04 erg/cm2
Error -------- 3.99e-07 4.79e-07 -------- 1.25e-06 -------- erg/cm2
Peak flux Cutoff-PL 1.40e+01 2.10e+01 2.12e+01 2.53e+01 6.72e+01 8.16e+01 ph/cm2/s
Error 1.44e+00 1.01e+00 1.07e+00 6.03e+00 2.63e+00 6.49e+00 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 1.357 0.028 - - 8.99e-03 1.37e-04 36.960 57
CPL 1.353 0.029 10000.0 0.0 9.02e-03 1.34e-04 37.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.026 0.063 - - 5.89e-01 2.20e-02 74.420 57
CPL 0.664 0.259 214.7 194.2 8.53e-01 2.24e-01 68.220 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: 68.544000 sec.
T50 in the 50-300 keV band: 17.600000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 531.544 -3.816 527.728
T90 108.400 0.220 108.620
T50 20.068 8.288 28.356
Peak 1.000 10.936 11.936
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
0.5286 -2.9255 0.0078 45.1652 47.0600 49.7042722 24.578 TRIG_00848890
Foreground time interval of the image:
-3.816 12.013 (delta_t = 15.829 [sec])
Background time interval of the image:
-40.387 -3.816 (delta_t = 36.571 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -20.000 sec. to 961.112 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35694 ( -0.0285103 0.0283626 )
Norm@50keV : 8.98678E-03 ( -0.000137458 0.000137122 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 36.96 using 59 PHA bins.
# Reduced chi-squared = 0.6484 for 57 degrees of freedom
# Null hypothesis probability = 9.818105e-01
Photon flux (15-150 keV) in 981.1 sec: 1.08422 ( -0.01958 0.01965 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.59911e-05 ( -1.24817e-06 1.24645e-06 ) ergs/cm2
Cutoff power-law model
Time interval is from -20.000 sec. to 961.112 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35291 ( -0.030804 0.0267804 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 9.02085E-03 ( -0.000137388 0.000130253 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.17 using 59 PHA bins.
# Reduced chi-squared = 0.6638 for 56 degrees of freedom
# Null hypothesis probability = 9.752820e-01
Photon flux (15-150 keV) in 981.1 sec: 1.08382 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.59753e-05 ( -1.24798e-06 1.24216e-06 ) ergs/cm2
Band function
Time interval is from -20.000 sec. to 961.112 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 21.1920 ( )
R^2/D10^2 : 3.74622E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1109.07 using 59 PHA bins.
# Reduced chi-squared = 19.4574 for 57 degrees of freedom
# Null hypothesis probability = 7.757307e-195
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.106e-06 1.001e-07
25- 50 1.606e-05 4.023e-07
50-150 5.378e-05 1.163e-06
15-150 7.295e-05 1.163e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 4.69490 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 310.14 using 59 PHA bins.
# Reduced chi-squared = 5.4410 for 57 degrees of freedom
# Null hypothesis probability = 1.656041e-36
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.147e-05 1.962e-07
25- 50 2.206e-05 3.679e-07
50-150 4.839e-05 8.192e-07
15-150 8.192e-05 1.526e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.51487 (-0.477207 0.500404)
R1^2/D10^2 : 0.541563 (-0.0958776 0.121475)
kT2 [keV] : 35.8812 (-2.0422 2.42956)
R2^2/D10^2 : 5.46338E-03 (-0.00104812 0.00117671)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.76 using 59 PHA bins.
# Reduced chi-squared = 0.9956 for 55 degrees of freedom
# Null hypothesis probability = 4.839305e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.229e-06 4.871e-07
25- 50 2.047e-05 5.543e-07
50-150 5.711e-05 1.643e-06
15-150 8.581e-05 1.761e-06
Peak spectrum fit
Power-law model
Time interval is from 10.936 sec. to 11.936 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.02558 ( -0.0633522 0.0631034 )
Norm@50keV : 0.588910 ( -0.0220061 0.0219957 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.42 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 57 degrees of freedom
# Null hypothesis probability = 6.045939e-02
Photon flux (15-150 keV) in 1 sec: 67.9024 ( -2.58087 2.58154 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.31156e-06 ( -2.59271e-07 2.59567e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 10.936 sec. to 11.936 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.663509 ( -0.266226 0.251136 )
Epeak [keV] : 214.739 ( -66.7397 321.716 )
Norm@50keV : 0.853391 ( -0.189165 0.25844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.22 using 59 PHA bins.
# Reduced chi-squared = 1.218 for 56 degrees of freedom
# Null hypothesis probability = 1.267865e-01
Photon flux (15-150 keV) in 1 sec: 67.1509 ( -2.6298 2.6306 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.36708e-07 ( -1.66673e-07 1.60607e-07 ) ergs/cm2
Band function
Time interval is from 10.936 sec. to 11.936 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 21.6557 ( )
R^2/D10^2 : 2.59343 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 175.74 using 59 PHA bins.
# Reduced chi-squared = 3.0832 for 57 degrees of freedom
# Null hypothesis probability = 4.956406e-14
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.267e-07 1.665e-08
25- 50 1.188e-06 6.450e-08
50-150 4.159e-06 2.745e-07
15-150 5.573e-06 2.460e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 272.923 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 251.47 using 59 PHA bins.
# Reduced chi-squared = 4.4118 for 57 degrees of freedom
# Null hypothesis probability = 2.992693e-26
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.796e-07 3.000e-08
25- 50 1.307e-06 5.350e-08
50-150 2.867e-06 1.190e-07
15-150 4.854e-06 2.090e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.20941 (-1.51113 1.73557)
R1^2/D10^2 : 20.0176 (-7.40948 13.6814)
kT2 [keV] : 35.6286 (-4.89939 8.16761)
R2^2/D10^2 : 0.449843 (-0.215559 0.286656)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.11 using 59 PHA bins.
# Reduced chi-squared = 1.220 for 55 degrees of freedom
# Null hypothesis probability = 1.268156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.142e-07 6.830e-08
25- 50 1.262e-06 1.475e-07
50-150 4.620e-06 6.335e-07
15-150 6.296e-06 7.710e-07
Plot creation:
Sat Jul 21 12:46:38 EDT 2018