batgrbproduct analysis for trigger=895479
batgrbproduct Analysis for Trigger=895479
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): Thu Mar 28 17:19:37 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger895479/GCN5_download_cron
======================================================================
Trigger: 00895479 Segment: 000
BAT Trigger Time: 575414888 [s; MET]
Trigger Stop: 575415016 [s; MET]
UTC: 2019-03-27T21:27:45.358300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 314.705126854701 Dec: 41.7447121729859 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 9.88
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 9.88
Flight Position: [ source = BAT ]
RA: 314.705126854701 Dec: 41.7447121729859 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 314.67877151912 Dec: 41.7554874776749 [deg; J2000]
{ 20h 58m 42.9s , +41d 45' 19.8" }
+/- 2.78937991182624 [arcmin] (estimated 90% radius based on SNR)
+/- 1.22104788915341 [arcmin] (formal 1-sigma fit error)
SNR: 7.02552612267855
Angular difference between Flight and Ground position is 1.345290 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
T50: 128 +/-
Measured from: 0
to: 128 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 128 second)
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 128 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.621595 0.523873 0.015372 -0.115718
0.076543 0.077557 0.064996 0.053925 [error]
Peak 0.621595 0.523873 0.015372 -0.115718
0.076543 0.077557 0.064996 0.053925 [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 1.81e-07 1.65e-07 1.04e-07 1.01e-07 4.93e-07 5.52e-07 erg/cm2
Error 3.39e-08 3.54e-08 4.32e-08 7.56e-08 1.10e-07 1.52e-07 erg/cm2
Peak flux Power-law 4.67e-02 2.39e-02 7.53e-03 3.04e-03 7.98e-02 8.11e-02 ph/cm2/s
Error 8.90e-03 4.92e-03 3.02e-03 2.14e-03 1.37e-02 1.41e-02 ph/cm2/s
Fluence Cutoff-PL 1.75e-07 2.17e-07 3.15e-08 1.45e-10 4.24e-07 4.24e-07 erg/cm2
Error 3.82e-08 5.13e-08 4.32e-08 3.70e-09 8.42e-08 8.43e-08 erg/cm2
Peak flux Cutoff-PL 4.37e-02 3.20e-02 2.62e-03 6.54e-06 7.83e-02 7.83e-02 ph/cm2/s
Error 1.00e-02 7.17e-03 3.34e-03 1.54e-04 1.31e-02 1.31e-02 ph/cm2/s
Fluence Band 1.74e-07 2.16e-07 3.72e-08 4.06e-10 4.29e-07 4.29e-07 erg/cm2
Error 3.77e-08 -------- -------- 2.60e-08 -------- -------- 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 2.662 0.366 - - 3.67e-04 1.15e-04 64.530 57
CPL -1.084 3.365 25.6 6.1 1.32e-01 1.31e+02 54.390 56
The chi2 of BB fit is 54.30 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.662 0.366 - - 3.67e-04 1.15e-04 64.530 57
CPL -1.084 3.365 25.6 6.1 1.32e-01 1.31e+02 54.390 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 128.000 0.000 128.000
T90 128.000 0.000 128.000
T50 128.000 0.000 128.000
Peak 128.000 0.000 128.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
314.6788 +41.7555 0.0273 13.5 -144.0 1.0528 7.0 TRIG_00895479
------------------------------------------
Foreground time interval of the image:
0.000 128.000 (delta_t = 128.000 [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 0.000 sec. to 128.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66244 ( -0.338381 0.393549 )
Norm@50keV : 3.66660E-04 ( -0.000112549 0.000116805 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.53 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.303088e-01
Photon flux (15-150 keV) in 128 sec: 7.98250E-02 ( -0.0136744 0.0137194 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92536e-07 ( -1.0583e-07 1.13405e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.08408 ( -4.57999 2.15032 )
Epeak [keV] : 25.6027 ( -7.51264 4.62574 )
Norm@50keV : 0.131708 ( -0.149098 262.735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.39 using 59 PHA bins.
# Reduced chi-squared = 0.9713 for 56 degrees of freedom
# Null hypothesis probability = 5.359656e-01
Photon flux (15-150 keV) in 128 sec: 7.83300E-02 ( -0.013055 0.013131 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23908e-07 ( -7.98144e-08 8.86682e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.19140 ( -2.20915 -1.16096 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 25.6970 ( -6.33846 4.55821 )
Norm@50keV : 0.156752 ( -0.156741 34.2905 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.36 using 59 PHA bins.
# Reduced chi-squared = 0.9884 for 55 degrees of freedom
# Null hypothesis probability = 4.988962e-01
Photon flux (15-150 keV) in 128 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29033e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.67780 (-0.959738 1.09207)
R^2/D10^2 : 0.200425 (-0.0945525 0.184042)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9526 for 57 degrees of freedom
# Null hypothesis probability = 5.770649e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.746e-07 4.900e-08
25- 50 2.178e-07 6.771e-08
50-150 3.034e-08 1.808e-08
15-150 4.227e-07 1.149e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.1724 (-7.1266 10.7637)
Norm : 0.781120 (-0.227642 0.345147)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.97 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 57 degrees of freedom
# Null hypothesis probability = 4.392653e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.839e-07 4.673e-08
25- 50 1.894e-07 5.538e-08
50-150 8.133e-08 5.268e-08
15-150 4.546e-07 1.196e-07
Double BB
# Reduced chi-squared = 0.9513 for 55 degrees of freedom
# Reduced chi-squared = 0.9503 for 55 degrees of freedom
# Reduced chi-squared = 0.9497 for 55 degrees of freedom
# Reduced chi-squared = 0.9496 for 55 degrees of freedom
# Null hypothesis probability = 5.010320e-01
# Null hypothesis probability = 5.022123e-01
# Null hypothesis probability = 5.557276e-01
# Null hypothesis probability = 5.666485e-01
# Null hypothesis probability = 5.737408e-01
# Null hypothesis probability = 5.776997e-01
# Null hypothesis probability = 5.798020e-01
# Null hypothesis probability = 5.809100e-01
# Null hypothesis probability = 5.813070e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.752e-07 1.062e-04
25- 50 2.166e-07 7.392e-04
50-150 3.320e-08 1.244e-02
15-150 4.250e-07 1.236e-02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.66244 ( -0.338381 0.393549 )
Norm@50keV : 3.66660E-04 ( -0.000112549 0.000116805 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.53 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 57 degrees of freedom
# Null hypothesis probability = 2.303088e-01
Photon flux (15-150 keV) in 128 sec: 7.98250E-02 ( -0.0136744 0.0137194 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92536e-07 ( -1.0583e-07 1.13405e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.08408 ( -4.57999 2.15032 )
Epeak [keV] : 25.6027 ( -7.51264 4.62574 )
Norm@50keV : 0.131708 ( -0.149098 262.735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.39 using 59 PHA bins.
# Reduced chi-squared = 0.9713 for 56 degrees of freedom
# Null hypothesis probability = 5.359656e-01
Photon flux (15-150 keV) in 128 sec: 7.83300E-02 ( -0.013055 0.013131 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23908e-07 ( -7.98144e-08 8.86682e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 128.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.19140 ( -2.20915 -1.16096 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 25.6970 ( -6.33851 4.55821 )
Norm@50keV : 0.156752 ( -0.156741 34.2871 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.36 using 59 PHA bins.
# Reduced chi-squared = 0.9884 for 55 degrees of freedom
# Null hypothesis probability = 4.988962e-01
Photon flux (15-150 keV) in 128 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.29033e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 6.67780 (-0.959738 1.09207)
R^2/D10^2 : 0.200425 (-0.0945525 0.184042)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.30 using 59 PHA bins.
# Reduced chi-squared = 0.9526 for 57 degrees of freedom
# Null hypothesis probability = 5.770649e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.746e-07 4.783e-08
25- 50 2.178e-07 6.833e-08
50-150 3.034e-08 1.702e-08
15-150 4.227e-07 1.172e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.1724 (-7.1266 10.7637)
Norm : 0.781120 (-0.227642 0.345147)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.97 using 59 PHA bins.
# Reduced chi-squared = 1.017 for 57 degrees of freedom
# Null hypothesis probability = 4.392653e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.839e-07 4.580e-08
25- 50 1.894e-07 6.346e-08
50-150 8.133e-08 5.590e-08
15-150 4.546e-07 1.306e-07
Double BB
# Reduced chi-squared = 0.9513 for 55 degrees of freedom
# Reduced chi-squared = 0.9503 for 55 degrees of freedom
# Reduced chi-squared = 0.9497 for 55 degrees of freedom
# Reduced chi-squared = 0.9496 for 55 degrees of freedom
# Null hypothesis probability = 5.010320e-01
# Null hypothesis probability = 5.022123e-01
# Null hypothesis probability = 5.557276e-01
# Null hypothesis probability = 5.666485e-01
# Null hypothesis probability = 5.737408e-01
# Null hypothesis probability = 5.776997e-01
# Null hypothesis probability = 5.798020e-01
# Null hypothesis probability = 5.809100e-01
# Null hypothesis probability = 5.813070e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.752e-07 1.251e-04
25- 50 2.166e-07 7.827e-04
50-150 3.320e-08 1.267e-02
15-150 4.250e-07 1.260e-02
Plot creation:
Thu Mar 28 17:23:04 EDT 2019