batgrbproduct analysis for trigger=895813
batgrbproduct Analysis for Trigger=895813
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): Sun Mar 31 14:26:19 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger895813/GCN5_download_cron
======================================================================
Trigger: 00895813 Segment: 000
BAT Trigger Time: 575691300.232 [s; MET]
Trigger Stop: 575691300.296 [s; MET]
UTC: 2019-03-31T02:14:37.572760 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 28.5761909565301 Dec: 27.6194435216332 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.8
Image Trigger?: NO
Rate S/N Ratio: 26.0192236625154 [ if not an image trigger ]
Image S/N Ratio: 8.8
Flight Position: [ source = BAT ]
RA: 28.5761909565301 Dec: 27.6194435216332 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 28.6291856351545 Dec: 27.6783164573053 [deg; J2000]
{ 01h 54m 31.0s , +27d 40' 41.9" }
+/- 4.77914760957413 [arcmin] (estimated 90% radius based on SNR)
+/- 3.83582370727407 [arcmin] (formal 1-sigma fit error)
SNR: 3.2555003404359
Angular difference between Flight and Ground position is 4.517836 arcmin
Partial Coding Fraction: 0.828125 [ including projection effects ]
Duration
T90: 46.8559999465942 +/- 101.658258645487
Measured from: -161.55999982357
to: -114.703999876976 [s; relative to TRIGTIME]
T50: 49.8279999494553 +/- 115.976341656878
Measured from: -154.507999897003
to: -104.679999947548 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0920000076293945
to: 0.907999992370605 [s; relative to TRIGTIME]
Total Fluence
Measured from: -179.340000033379
to: 4.51199996471405 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.312554 -0.027933 0.522140 0.102125
0.164993 0.172580 0.153879 0.153483 [error]
Peak 0.087930 0.123755 0.115254 0.035782
0.009413 0.010193 0.009866 0.008037 [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 1.58e-08 7.30e-08 2.88e-07 4.20e-06 8.51e-07 4.54e-06 erg/cm2
Error 2.67e-08 7.53e-08 1.43e-07 5.82e-06 4.04e-07 5.95e-06 erg/cm2
Peak flux Power-law 7.39e-01 8.92e-01 7.80e-01 1.17e+00 2.82e+00 3.58e+00 ph/cm2/s
Error 1.16e-01 8.54e-02 7.86e-02 2.49e-01 2.41e-01 3.29e-01 ph/cm2/s
Fluence Cutoff-PL 5.67e-11 1.50e-08 4.51e-07 5.67e-07 9.38e-07 1.03e-06 erg/cm2
Error 8.65e-10 2.45e-08 1.96e-07 -------- 3.92e-07 4.35e-07 erg/cm2
Peak flux Cutoff-PL 7.18e-01 9.05e-01 7.92e-01 9.74e-01 2.81e+00 3.39e+00 ph/cm2/s
Error 1.24e-01 9.62e-02 8.89e-02 4.13e-01 2.46e-01 5.00e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error -------- -------- 3.50e+02 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.021 1.077 - - 2.64e-04 1.53e-04 78.410 57
CPL -10.000 -2.165 106.3 23.4 3.69e-02 2.99e-02 71.960 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.194 0.146 - - 2.41e-02 2.03e-03 40.580 57
CPL 1.045 0.428 334.8 0.0 2.85e-02 1.57e-02 40.340 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: 1.152000 sec.
T50 in the 50-300 keV band: 0.896000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 183.852 -179.340 4.512
T90 46.856 -161.560 -114.704
T50 49.828 -154.508 -104.680
Peak 1.000 -0.092 0.908
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
28.6292 +27.6783 0.0587 18.7 -82.5 0.5895 3.3 TRIG_00895813
------------------------------------------
Foreground time interval of the image:
-91.031 -16.420 (delta_t = 74.611 [sec])
-15.232 4.512 (delta_t = 19.744 [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
Multiple GTIs in the spectrum
tstart tstop
-179.340000 -16.420300
-15.232000 4.512000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.09760E-02 ( -1.20744 0.946739 )
Norm@50keV : 2.64381E-04 ( -0.000111727 0.000194808 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.41 using 59 PHA bins.
# Reduced chi-squared = 1.376 for 57 degrees of freedom
# Null hypothesis probability = 3.154237e-02
Photon flux (15-150 keV) in 182.7 sec: 3.54419E-02 ( -0.0177384 0.0191492 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.50759e-07 ( -4.02649e-07 4.05101e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-179.340000 -16.420300
-15.232000 4.512000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.99982 ( 10 5.66942 )
Epeak [keV] : 106.346 ( -16.5273 30.3481 )
Norm@50keV : 3.69367E-02 ( -0.036564 0.0232689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.96 using 59 PHA bins.
# Reduced chi-squared = 1.285 for 56 degrees of freedom
# Null hypothesis probability = 7.404534e-02
Photon flux (15-150 keV) in 182.7 sec: 3.42671E-02 3.41459E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64685e-17 ( 0 0 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-179.340000 -16.420300
-15.232000 4.512000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -6.22213 -4.81135 )
beta : -9.37167 ( 9.37167 19.3717 )
Epeak [keV] : 119.768 ( -26.2827 48.1833 )
Norm@50keV : 4.28737E-03 ( -0.00170178 0.0115666 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.28 using 59 PHA bins.
# Reduced chi-squared = 1.350 for 55 degrees of freedom
# Null hypothesis probability = 4.266157e-02
Photon flux (15-150 keV) in 182.7 sec: 0.0 ( ) 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] : 47.5753 (-20.1386 -46.3201)
R^2/D10^2 : 1.98484E-04 (-0.000208174 0.000733867)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.04 using 59 PHA bins.
# Reduced chi-squared = 1.352 for 57 degrees of freedom
# Null hypothesis probability = 3.972911e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.242e-08 3.750e-08
25- 50 2.621e-08 2.418e-08
50-150 9.554e-10 1.778e-09
15-150 6.959e-08 5.127e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.360 (-199.362 -199.362)
Norm : 0.126435 (-0.0877053 0.0877044)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 84.83 using 59 PHA bins.
# Reduced chi-squared = 1.488 for 57 degrees of freedom
# Null hypothesis probability = 9.806041e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.752e-08 4.382e-08
25- 50 1.106e-07 8.731e-08
50-150 2.427e-07 1.899e-07
15-150 4.108e-07 3.068e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.96217 (-3.93311 -3.93311)
R1^2/D10^2 : 0.143361 (-0.145345 -0.145345)
kT2 [keV] : 48.1952 (-21.7918 -48.5045)
R2^2/D10^2 : 1.97902E-04 (-0.000182272 0.000690563)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.77 using 59 PHA bins.
# Reduced chi-squared = 1.396 for 55 degrees of freedom
# Null hypothesis probability = 2.784491e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.218e-08 2.701e-08
25- 50 7.559e-08 4.472e-08
50-150 7.964e-07 4.955e-07
15-150 9.042e-07 5.250e-07
Peak spectrum fit
Power-law model
Time interval is from -0.092 sec. to 0.908 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19390 ( -0.14704 0.145898 )
Norm@50keV : 2.40598E-02 ( -0.00202958 0.00202777 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.58 using 59 PHA bins.
# Reduced chi-squared = 0.7118 for 57 degrees of freedom
# Null hypothesis probability = 9.508497e-01
Photon flux (15-150 keV) in 1 sec: 2.82172 ( -0.240432 0.240587 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.44522e-07 ( -2.35317e-08 2.37142e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.092 sec. to 0.908 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04483 ( -0.576642 0.278986 )
Epeak [keV] : 334.775 ( -334.775 -334.775 )
Norm@50keV : 2.84893E-02 ( -0.0062378 0.0250916 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.34 using 59 PHA bins.
# Reduced chi-squared = 0.7204 for 56 degrees of freedom
# Null hypothesis probability = 9.430586e-01
Photon flux (15-150 keV) in 1 sec: 2.80589 ( -0.2467 0.24517 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.42e-07 ( -2.5656e-08 2.5299e-08 ) ergs/cm2
Band function
Time interval is from -0.092 sec. to 0.908 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.93519 ( -13.9965 -4.93519 )
beta : -1.29343 ( -0.1934 0.168788 )
Epeak [keV] : 27.0398 ( -7.44198 4.8559 )
Norm@50keV : 1126.40 ( -94.2988 7362.97 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.30 using 59 PHA bins.
# Reduced chi-squared = 0.6781 for 55 degrees of freedom
# Null hypothesis probability = 9.676880e-01
Photon flux (15-150 keV) in 1 sec: 0.0 ( ) 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] : 18.0669 (-2.10231 2.46417)
R^2/D10^2 : 0.179980 (-0.0610109 0.0903583)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.09 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.599973e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.175e-08 1.936e-09
25- 50 5.448e-08 6.890e-09
50-150 1.292e-07 2.070e-08
15-150 1.954e-07 2.180e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-21.4615 -200)
Norm : 11.4862 (-0.985348 0.985348)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.58 using 59 PHA bins.
# Reduced chi-squared = 0.9750 for 57 degrees of freedom
# Null hypothesis probability = 5.286103e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.860e-08 8.935e-09
25- 50 5.501e-08 1.458e-08
50-150 1.207e-07 6.349e-08
15-150 2.043e-07 8.411e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.21566 (-2.0678 2.59948)
R1^2/D10^2 : 1.53237 (-0.847757 1.20052)
kT2 [keV] : 35.5602 (-9.69726 31.1508)
R2^2/D10^2 : 1.66898E-02 (-0.0136169 0.0305571)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.42 using 59 PHA bins.
#Fit statistic : Chi-Squared = 38.48 using 59 PHA bins.
# Reduced chi-squared = 0.7349 for 55 degrees of freedom
# Reduced chi-squared = 0.6997 for 55 degrees of freedom
# Null hypothesis probability = 9.293625e-01
# Null hypothesis probability = 9.556238e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.163e-08 1.278e-08
25- 50 5.030e-08 2.501e-08
50-150 1.537e-07 8.721e-08
15-150 2.256e-07 1.034e-07
Plot creation:
Sun Mar 31 14:29:55 EDT 2019