batgrbproduct analysis for trigger=827924
batgrbproduct Analysis for Trigger=827924
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 Apr 23 09:13:27 EDT 2018
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger827924/GCN5_download_cron
======================================================================
Trigger: 00827924 Segment: 000
BAT Trigger Time: 546139848 [s; MET]
Trigger Stop: 546140624 [s; MET]
UTC: 2018-04-23T01:30:27.170940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 275.075327495063 Dec: 7.1934875314008 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 26.43
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 26.43
Flight Position: [ source = BAT ]
RA: 275.075327495063 Dec: 7.1934875314008 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 275.082455556266 Dec: 7.18574342065212 [deg; J2000]
{ 18h 20m 19.8s , +07d 11' 08.7" }
+/- 0.431813833999037 [arcmin] (estimated 90% radius based on SNR)
+/- 0.115193519368493 [arcmin] (formal 1-sigma fit error)
SNR: 100.953947674593
Angular difference between Flight and Ground position is 0.629241 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 784.787999868393 +/- 16.0551460061756
Measured from: 34.1920000314713
to: 818.979999899864 [s; relative to TRIGTIME]
T50: 382.263999938965 +/- 11.5632073162527
Measured from: 315.116000056267
to: 697.379999995232 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 844.636000037193
to: 845.636000037193 [s; relative to TRIGTIME]
Total Fluence
Measured from: -77.1599999666214
to: 847.916000008583 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 39.513585 48.094591 25.941766 3.576723
0.219719 0.215164 0.175869 0.135975 [error]
Peak 0.061899 0.108906 0.052782 0.029551
0.016439 0.017490 0.015072 0.010485 [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 1.51e-05 1.99e-05 1.92e-05 3.31e-05 6.51e-05 8.73e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 7.04e-01 5.89e-01 3.35e-01 2.83e-01 1.75e+00 1.91e+00 ph/cm2/s
Error 2.10e-01 1.27e-01 9.45e-02 1.44e-01 3.80e-01 4.10e-01 ph/cm2/s
Fluence Cutoff-PL 1.23e-05 2.02e-05 2.04e-05 1.78e-05 6.22e-05 7.08e-05 erg/cm2
Error 5.62e-07 3.55e-07 3.43e-07 1.61e-06 9.78e-07 1.96e-06 erg/cm2
Peak flux Cutoff-PL 5.78e-01 7.30e-01 3.86e-01 7.20e-02 1.75e+00 1.77e+00 ph/cm2/s
Error 2.39e-01 1.82e-01 1.31e-01 1.18e-01 3.80e-01 3.90e-01 ph/cm2/s
Fluence Band 1.22e-05 2.01e-05 2.04e-05 1.96e-05 6.21e-05 7.25e-05 erg/cm2
Error -------- 3.78e-07 -------- -------- -------- -------- erg/cm2
Peak flux Band 5.78e-01 7.30e-01 3.86e-01 -------- 1.75e+00 1.77e+00 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 2.048 0.000 - - 7.60e-03 0.00e+00 141.110 57
CPL 1.365 0.114 53.6 2.4 1.50e-02 1.66e-03 24.030 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.814 0.314 - - 1.27e-02 2.94e-03 51.200 57
CPL 0.156 1.775 52.2 26.3 1.01e-01 7.99e-01 47.080 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 925.076 -77.160 847.916
T90 784.788 34.192 818.980
T50 382.264 315.116 697.380
Peak 1.000 844.636 845.636
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
275.0825 +7.1857 0.0019 16.8 178.7 104.2591 101.0 TRIG_00827924
------------------------------------------
Foreground time interval of the image:
-14.899 792.201 (delta_t = 807.100 [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 -77.160 sec. to 847.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.04773 ( )
Norm@50keV : 7.60365E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.11 using 59 PHA bins.
# Reduced chi-squared = 2.4757 for 57 degrees of freedom
# Null hypothesis probability = 4.387155e-09
Photon flux (15-150 keV) in 925.1 sec: 1.16632 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.50638e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -77.160 sec. to 847.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36483 ( -0.115696 0.113143 )
Epeak [keV] : 53.6299 ( -2.52071 2.3659 )
Norm@50keV : 1.49848E-02 ( -0.00155371 0.00177111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.03 using 59 PHA bins.
# Reduced chi-squared = 0.4291 for 56 degrees of freedom
# Null hypothesis probability = 9.999430e-01
Photon flux (15-150 keV) in 925.1 sec: 1.07218 ( -0.02518 0.02545 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.22231e-05 ( -9.77091e-07 9.79311e-07 ) ergs/cm2
Band function
Time interval is from -77.160 sec. to 847.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.36094 ( -0.111 0.261687 )
beta : -3.09535 ( 3.09965 0.707878 )
Epeak [keV] : 53.5701 ( -3.80018 2.30042 )
Norm@50keV : 1.50507E-02 ( -0.00155646 0.00547759 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.02 using 59 PHA bins.
# Reduced chi-squared = 0.4367 for 55 degrees of freedom
# Null hypothesis probability = 9.999122e-01
Photon flux (15-150 keV) in 925.1 sec: 1.07175 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.21219e-05 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 15.0610 ( )
R^2/D10^2 : 0.100984 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 1067.87 using 59 PHA bins.
# Reduced chi-squared = 18.7346 for 57 degrees of freedom
# Null hypothesis probability = 2.423875e-186
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.434e-06 1.267e-07
25- 50 1.768e-05 3.515e-07
50-150 2.735e-05 5.088e-07
15-150 4.946e-05 6.892e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.2543 (-3.13525 3.34306)
Norm : 5.01113 (-0.127728 0.130813)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 24.13 using 59 PHA bins.
# Reduced chi-squared = 0.4234 for 57 degrees of freedom
# Null hypothesis probability = 9.999608e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.207e-05 2.960e-07
25- 50 2.017e-05 3.562e-07
50-150 2.969e-05 5.088e-07
15-150 6.193e-05 8.603e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.49902 (-0.380944 0.392331)
R1^2/D10^2 : 0.991255 (-0.16772 0.21247)
kT2 [keV] : 22.5904 (-0.943307 1.08076)
R2^2/D10^2 : 1.49831E-02 (-0.00283517 0.0031943)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.89 using 59 PHA bins.
# Reduced chi-squared = 0.7615 for 55 degrees of freedom
# Null hypothesis probability = 9.034533e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.014e-05 5.366e-07
25- 50 2.074e-05 4.949e-07
50-150 2.940e-05 6.244e-07
15-150 6.028e-05 1.147e-06
Peak spectrum fit
Power-law model
Time interval is from 844.636 sec. to 845.636 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81372 ( -0.302049 0.326314 )
Norm@50keV : 1.26572E-02 ( -0.00296464 0.00290668 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.20 using 59 PHA bins.
# Reduced chi-squared = 0.8983 for 57 degrees of freedom
# Null hypothesis probability = 6.912495e-01
Photon flux (15-150 keV) in 1 sec: 1.75344 ( -0.379415 0.379797 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16482e-07 ( -2.7197e-08 2.74653e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 844.636 sec. to 845.636 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.155789 ( -2.13587 1.4135 )
Epeak [keV] : 52.2104 ( -13.2672 39.386 )
Norm@50keV : 0.100543 ( -0.100544 1.4979 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.08 using 59 PHA bins.
# Reduced chi-squared = 0.8407 for 56 degrees of freedom
# Null hypothesis probability = 7.962699e-01
Photon flux (15-150 keV) in 1 sec: 1.75379 ( -0.37858 0.38124 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.12892e-07 ( -2.81171e-08 2.8368e-08 ) ergs/cm2
Band function
Time interval is from 844.636 sec. to 845.636 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.170976 ( -1.34059 1.79274 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 52.2887 ( -13.3565 38.9917 )
Norm@50keV : 9.86436E-02 ( -0.0986456 1.50017 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.08 using 59 PHA bins.
# Reduced chi-squared = 0.8560 for 55 degrees of freedom
# Null hypothesis probability = 7.674098e-01
Photon flux (15-150 keV) in 1 sec: 1.75395 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13121e-07 ( -1.13114e-07 -2.79204e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2206 (-2.5642 3.13943)
R^2/D10^2 : 0.446923 (-0.257414 0.603794)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.08 using 59 PHA bins.
# Reduced chi-squared = 0.8611 for 57 degrees of freedom
# Null hypothesis probability = 7.628500e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.414e-08 5.605e-09
25- 50 4.544e-08 1.705e-08
50-150 4.130e-08 1.823e-08
15-150 1.009e-07 3.486e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 94.1463 (-40.5915 -94.1269)
Norm : 8.21083 (-2.09003 2.62602)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.75 using 59 PHA bins.
# Reduced chi-squared = 0.8553 for 57 degrees of freedom
# Null hypothesis probability = 7.734449e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.145e-08 6.105e-09
25- 50 3.663e-08 1.161e-08
50-150 5.731e-08 3.906e-08
15-150 1.154e-07 4.583e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.02296 (-8.02084 -8.02084)
R1^2/D10^2 : 1.23590 (-1.23659 -1.23659)
kT2 [keV] : 19.2350 (-19.2276 -19.2276)
R2^2/D10^2 : 4.85134E-02 (-0.0486134 0.607295)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.92 using 59 PHA bins.
# Reduced chi-squared = 0.8532 for 55 degrees of freedom
# Null hypothesis probability = 7.723992e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.793e-08 1.114e-08
25- 50 4.240e-08 2.499e-08
50-150 5.316e-08 3.061e-08
15-150 1.135e-07 6.290e-08
Plot creation:
Mon Apr 23 09:18:24 EDT 2018