batgrbproduct analysis for trigger=897653
batgrbproduct Analysis for Trigger=897653
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 Apr 10 13:32:10 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger897653/GCN5_download_cron
======================================================================
Trigger: 00897653 Segment: 000
BAT Trigger Time: 576507704 [s; MET]
Trigger Stop: 576507768 [s; MET]
UTC: 2019-04-09T13:01:21.289020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 324.921589868799 Dec: -46.6073895633698 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.18
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.18
Flight Position: [ source = BAT ]
RA: 324.921589868799 Dec: -46.6073895633698 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 324.96379895516 Dec: -46.5553330515481 [deg; J2000]
{ 21h 39m 51.3s , -46d 33' 19.2" }
+/- 4.34826443245401 [arcmin] (estimated 90% radius based on SNR)
+/- 2.59311059577959 [arcmin] (formal 1-sigma fit error)
SNR: 3.7259622934164
Angular difference between Flight and Ground position is 3.575686 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 61.055999994278 +/- 13.447617087903
Measured from: 1.22400009632111
to: 62.2800000905991 [s; relative to TRIGTIME]
T50: 39.0520000457764 +/- 16.6403677382137
Measured from: 14.3840000629425
to: 53.4360001087189 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 61.4520000219345
to: 62.4520000219345 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.23599994182587
to: 68.7200000286102 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.361322 0.350708 0.182176 0.078275
0.070792 0.073243 0.065093 0.060558 [error]
Peak 0.016768 0.030543 0.021425 0.005526
0.008570 0.008862 0.007999 0.007742 [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 1.16e-07 1.51e-07 1.45e-07 2.48e-07 4.95e-07 6.60e-07 erg/cm2
Error 3.30e-08 3.46e-08 5.85e-08 1.95e-07 1.37e-07 2.67e-07 erg/cm2
Peak flux Power-law 2.09e-01 2.03e-01 1.38e-01 1.47e-01 6.09e-01 6.96e-01 ph/cm2/s
Error 1.13e-01 7.34e-02 6.16e-02 1.30e-01 2.14e-01 2.46e-01 ph/cm2/s
Fluence Cutoff-PL 1.06e-07 1.79e-07 1.29e-07 3.20e-08 4.39e-07 4.45e-07 erg/cm2
Error 3.80e-08 5.12e-08 7.23e-08 1.54e-07 1.38e-07 2.62e-07 erg/cm2
Peak flux Cutoff-PL 1.60e-01 2.34e-01 1.55e-01 4.01e-02 5.80e-01 5.89e-01 ph/cm2/s
Error 1.31e-01 9.56e-02 7.87e-02 1.04e-01 2.18e-01 2.59e-01 ph/cm2/s
Fluence Band 1.05e-07 1.78e-07 1.22e-07 6.45e-08 4.41e-07 4.72e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.72e-01 2.25e-01 1.55e-01 6.19e-02 5.96e-01 6.19e-01 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 2.059 0.418 - - 7.64e-04 2.28e-04 51.290 57
CPL 0.647 2.144 37.7 0.0 5.36e-03 1.40e-01 49.660 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.559 0.585 - - 4.80e-03 1.75e-03 44.020 57
CPL 0.003 3.579 63.3 0.0 2.98e-02 0.00e+00 42.880 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 69.956 -1.236 68.720
T90 61.056 1.224 62.280
T50 39.052 14.384 53.436
Peak 1.000 61.452 62.452
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
324.9638 -46.5553 0.0516 34.1 -161.1 0.7339 3.7 TRIG_00897653
------------------------------------------
Foreground time interval of the image:
-1.236 68.720 (delta_t = 69.956 [sec])
Background time interval of the image:
-60.000 -1.236 (delta_t = 58.764 [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 -1.236 sec. to 68.720 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.05875 ( -0.388806 0.446645 )
Norm@50keV : 7.63650E-04 ( -0.000232482 0.000223806 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.29 using 59 PHA bins.
# Reduced chi-squared = 0.8997 for 57 degrees of freedom
# Null hypothesis probability = 6.883472e-01
Photon flux (15-150 keV) in 69.96 sec: 0.117754 ( -0.0259196 0.0259223 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.94591e-07 ( -1.33399e-07 1.40875e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.236 sec. to 68.720 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.646592 ( -2.83957 1.44869 )
Epeak [keV] : 37.6971 ( -37.6971 -37.6971 )
Norm@50keV : 5.36278E-03 ( -0.00536272 0.274143 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.66 using 59 PHA bins.
# Reduced chi-squared = 0.8868 for 56 degrees of freedom
# Null hypothesis probability = 7.120362e-01
Photon flux (15-150 keV) in 69.96 sec: 0.113671 ( -0.0256886 0.026298 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.39152e-07 ( -1.2252e-07 1.53908e-07 ) ergs/cm2
Band function
Time interval is from -1.236 sec. to 68.720 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.656115 ( 0.561258 0.561258 )
beta : -3.29532 ( 3.37942 4.12482 )
Epeak [keV] : 37.0433 ( -37.0116 75.896 )
Norm@50keV : 5.38487E-03 ( -0.0061735 126.067 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.68 using 59 PHA bins.
# Reduced chi-squared = 0.9032 for 55 degrees of freedom
# Null hypothesis probability = 6.775136e-01
Photon flux (15-150 keV) in 69.96 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.40931e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.70810 (-2.06795 2.53569)
R^2/D10^2 : 6.40284E-02 (-0.0379488 0.0953903)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.44 using 59 PHA bins.
# Reduced chi-squared = 0.9025 for 57 degrees of freedom
# Null hypothesis probability = 6.828427e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.506e-08 3.888e-08
25- 50 2.027e-07 8.080e-08
50-150 9.703e-08 5.867e-08
15-150 3.848e-07 1.548e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.2717 (-24.9665 65.795)
Norm : 0.644564 (-0.198286 0.294423)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.96 using 59 PHA bins.
# Reduced chi-squared = 0.8765 for 57 degrees of freedom
# Null hypothesis probability = 7.341259e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.121e-07 3.674e-08
25- 50 1.672e-07 7.089e-08
50-150 1.801e-07 1.108e-07
15-150 4.593e-07 1.904e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.47223 (-3.40715 93.6436)
R1^2/D10^2 : 1.72351 (-1.76784 -1.76784)
kT2 [keV] : 11.7660 (-3.14106 -11.7265)
R2^2/D10^2 : 2.62842E-02 (-0.0264805 0.0740468)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.10 using 59 PHA bins.
# Reduced chi-squared = 0.8927 for 55 degrees of freedom
# Null hypothesis probability = 6.983595e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.066e-07 5.863e-08
25- 50 1.777e-07 1.022e-07
50-150 1.358e-07 8.937e-08
15-150 4.201e-07 2.240e-07
Peak spectrum fit
Power-law model
Time interval is from 61.452 sec. to 62.452 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.55881 ( -0.563132 0.606621 )
Norm@50keV : 4.79562E-03 ( -0.00177553 0.00173013 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.02 using 59 PHA bins.
# Reduced chi-squared = 0.7723 for 57 degrees of freedom
# Null hypothesis probability = 8.959850e-01
Photon flux (15-150 keV) in 1 sec: 0.608655 ( -0.213664 0.214361 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.50902e-08 ( -1.73057e-08 1.79271e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 61.452 sec. to 62.452 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.05454E-03 ( -4.94538 2.21319 )
Epeak [keV] : 63.2888 ( )
Norm@50keV : 2.97961E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.88 using 59 PHA bins.
# Reduced chi-squared = 0.7657 for 56 degrees of freedom
# Null hypothesis probability = 9.011473e-01
Photon flux (15-150 keV) in 1 sec: 0.580375 ( -0.217528 0.219298 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.15906e-08 ( -1.69472e-08 1.87857e-08 ) ergs/cm2
Band function
Time interval is from 61.452 sec. to 62.452 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.02480E-03 ( -1.87606 4.69637 )
beta : -10.0000 ( 10 0 )
Epeak [keV] : 62.6024 ( -24.3463 214.941 )
Norm@50keV : 3.04765E-02 ( -0.0304112 6.63614 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.88 using 59 PHA bins.
# Reduced chi-squared = 0.7796 for 55 degrees of freedom
# Null hypothesis probability = 8.826812e-01
Photon flux (15-150 keV) in 1 sec: 0.595554 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.28213e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4999 (-4.58235 6.91101)
R^2/D10^2 : 8.28345E-02 (-0.0828344 0.229313)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.39 using 59 PHA bins.
# Reduced chi-squared = 0.7612 for 57 degrees of freedom
# Null hypothesis probability = 9.081278e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.664e-09 2.354e-09
25- 50 1.410e-08 8.815e-09
50-150 1.987e-08 1.371e-08
15-150 3.763e-08 2.480e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 174.964 (-119.413 -169.587)
Norm : 2.52208 (-0.888947 1.26614)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.55 using 59 PHA bins.
# Reduced chi-squared = 0.7640 for 57 degrees of freedom
# Null hypothesis probability = 9.051898e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.381e-09 3.924e-09
25- 50 1.208e-08 7.525e-09
50-150 2.531e-08 1.566e-08
15-150 4.377e-08 2.735e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.31156 (-5.29979 -5.29979)
R1^2/D10^2 : 0.930475 (-0.943911 -0.943911)
kT2 [keV] : 17.1169 (-17.0963 -17.0963)
R2^2/D10^2 : 4.06402E-02 (-0.0409218 0.22983)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.87 using 59 PHA bins.
# Reduced chi-squared = 0.7794 for 55 degrees of freedom
# Null hypothesis probability = 8.829676e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.285e-09 2.934e-09
25- 50 1.293e-08 7.640e-09
50-150 2.269e-08 1.522e-08
15-150 4.091e-08 2.470e-08
Plot creation:
Wed Apr 10 13:35:24 EDT 2019