batgrbproduct analysis for trigger=887580
batgrbproduct Analysis for Trigger=887580
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): Tue Feb 5 03:35:31 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger887580/GCN5_download_cron
======================================================================
Trigger: 00887580 Segment: 000
BAT Trigger Time: 570951988.416 [s; MET]
Trigger Stop: 570951988.672 [s; MET]
UTC: 2019-02-04T05:46:06.055560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 351.514342317199 Dec: 54.8784731126214 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 20.24
Image Trigger?: NO
Rate S/N Ratio: 148.71449156017 [ if not an image trigger ]
Image S/N Ratio: 20.24
Flight Position: [ source = BAT ]
RA: 351.514342317199 Dec: 54.8784731126214 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 351.4907289103 Dec: 54.8839988959595 [deg; J2000]
{ 23h 25m 57.8s , +54d 53' 02.4" }
+/- 0.63946823872813 [arcmin] (estimated 90% radius based on SNR)
+/- 0.283457312242192 [arcmin] (formal 1-sigma fit error)
SNR: 57.6129136085859
Angular difference between Flight and Ground position is 0.879903 arcmin
Partial Coding Fraction: 0.484375 [ including projection effects ]
Duration
T90: 26.4399999380112 +/- 7.49263017493553
Measured from: -7.91599988937378
to: 18.5240000486374 [s; relative to TRIGTIME]
T50: 3.92400002479553 +/- 0.191415764671086
Measured from: -1.20799994468689
to: 2.71600008010864 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.447999954223633
to: 0.552000045776367 [s; relative to TRIGTIME]
Total Fluence
Measured from: -11.9279999732971
to: 48.8159999847412 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 4.164988 6.420755 5.802494 1.818027
0.087032 0.097286 0.091553 0.074845 [error]
Peak 0.685359 1.268728 1.322076 0.472189
0.023897 0.031422 0.032833 0.023822 [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 1.35e-06 2.81e-06 4.58e-06 1.68e-05 1.27e-05 2.55e-05 erg/cm2
Error 5.91e-08 7.11e-08 1.01e-07 8.93e-07 2.57e-07 9.26e-07 erg/cm2
Peak flux Power-law 7.39e+00 9.43e+00 8.80e+00 1.44e+01 3.05e+01 4.00e+01 ph/cm2/s
Error 4.28e-01 3.30e-01 2.74e-01 9.74e-01 8.91e-01 1.20e+00 ph/cm2/s
Fluence Cutoff-PL 1.30e-06 2.82e-06 4.64e-06 1.46e-05 1.26e-05 2.33e-05 erg/cm2
Error 6.05e-08 7.30e-08 1.22e-07 2.19e-06 2.75e-07 3.05e-06 erg/cm2
Peak flux Cutoff-PL 6.72e+00 9.58e+00 9.17e+00 1.05e+01 3.00e+01 3.59e+01 ph/cm2/s
Error 5.53e-01 3.50e-01 3.48e-01 1.93e+00 9.27e-01 2.16e+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 1.296 0.038 - - 2.11e-02 4.21e-04 47.340 57
CPL 1.179 0.131 422.1 0.0 2.36e-02 0.00e+00 45.580 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.101 0.050 - - 2.63e-01 7.42e-03 64.710 57
CPL 0.759 0.203 212.5 129.1 3.71e-01 7.46e-02 55.820 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: 14.016000 sec.
T50 in the 50-300 keV band: 2.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 60.744 -11.928 48.816
T90 26.440 -7.916 18.524
T50 3.924 -1.208 2.716
Peak 1.000 -0.448 0.552
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
351.4907 +54.8840 0.0033 31.3 145.9 16.4606 57.6 TRIG_00887580
------------------------------------------
Foreground time interval of the image:
-11.928 4.685 (delta_t = 16.613 [sec])
Background time interval of the image:
-239.416 -11.928 (delta_t = 227.488 [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 -11.928 sec. to 48.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.29557 ( -0.0378842 0.0377942 )
Norm@50keV : 2.10570E-02 ( -0.000421597 0.000421069 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8306 for 57 degrees of freedom
# Null hypothesis probability = 8.153879e-01
Photon flux (15-150 keV) in 60.74 sec: 2.51012 ( -0.0561378 0.0563104 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26526e-05 ( -2.57276e-07 2.57415e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -11.928 sec. to 48.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.17939 ( -0.153434 0.10823 )
Epeak [keV] : 422.130 ( )
Norm@50keV : 2.35678E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8139 for 56 degrees of freedom
# Null hypothesis probability = 8.387276e-01
Photon flux (15-150 keV) in 60.74 sec: 2.48734 ( -0.06245 0.06261 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25855e-05 ( -2.75213e-07 2.73937e-07 ) ergs/cm2
Band function
Time interval is from -11.928 sec. to 48.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17939 ( 0.885964 5.6965 )
beta : -9.90934 ( 9.36817 19.3682 )
Epeak [keV] : 422.061 ( -104.176 -422.061 )
Norm@50keV : 2.35650E-02 ( -0.000462209 0.00234339 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.58 using 59 PHA bins.
# Reduced chi-squared = 0.8287 for 55 degrees of freedom
# Null hypothesis probability = 8.134559e-01
Photon flux (15-150 keV) in 60.74 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] : 20.0877 ( )
R^2/D10^2 : 0.107592 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 516.77 using 59 PHA bins.
# Reduced chi-squared = 9.0661 for 57 degrees of freedom
# Null hypothesis probability = 2.587095e-75
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.075e-07 2.092e-08
25- 50 2.535e-06 7.471e-08
50-150 7.588e-06 2.187e-07
15-150 1.063e-05 2.490e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 10.7598 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 220.47 using 59 PHA bins.
# Reduced chi-squared = 3.8679 for 57 degrees of freedom
# Null hypothesis probability = 4.503647e-21
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.627e-06 3.766e-08
25- 50 3.131e-06 6.833e-08
50-150 6.866e-06 1.518e-07
15-150 1.162e-05 2.673e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.43294 (-0.713865 0.755937)
R1^2/D10^2 : 1.18130 (-0.282668 0.403963)
kT2 [keV] : 33.2785 (-2.57514 3.27035)
R2^2/D10^2 : 1.68745E-02 (-0.00450994 0.00534495)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.77 using 59 PHA bins.
# Reduced chi-squared = 0.9959 for 55 degrees of freedom
# Null hypothesis probability = 4.832207e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.123e-06 7.562e-08
25- 50 2.899e-06 1.285e-07
50-150 8.532e-06 4.313e-07
15-150 1.255e-05 5.315e-07
Peak spectrum fit
Power-law model
Time interval is from -0.448 sec. to 0.552 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.10065 ( -0.0497679 0.0496325 )
Norm@50keV : 0.262842 ( -0.00742182 0.0074186 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.71 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.255454e-01
Photon flux (15-150 keV) in 1 sec: 30.4898 ( -0.8905 0.891307 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74751e-06 ( -8.40728e-08 8.41907e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.448 sec. to 0.552 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.759219 ( -0.207661 0.198511 )
Epeak [keV] : 212.463 ( -58.3565 199.885 )
Norm@50keV : 0.370776 ( -0.0656493 0.0835326 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.82 using 59 PHA bins.
# Reduced chi-squared = 0.9969 for 56 degrees of freedom
# Null hypothesis probability = 4.814628e-01
Photon flux (15-150 keV) in 1 sec: 30.0153 ( -0.9265 0.9278 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71145e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.448 sec. to 0.552 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.762006 ( -0.263314 1.40664 )
beta : -5.39183 ( 8.94406 18.8765 )
Epeak [keV] : 214.645 ( -50.9887 193.781 )
Norm@50keV : 0.369443 ( -0.0553394 0.0197659 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.83 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.434265e-01
Photon flux (15-150 keV) in 1 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] : 21.0871 ( )
R^2/D10^2 : 1.22376 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 246.78 using 59 PHA bins.
# Reduced chi-squared = 4.3294 for 57 degrees of freedom
# Null hypothesis probability = 1.875259e-25
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.026e-07 5.705e-09
25- 50 5.289e-07 2.240e-08
50-150 1.753e-06 7.800e-08
15-150 2.385e-06 8.150e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 126.386 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 288.88 using 59 PHA bins.
# Reduced chi-squared = 5.0680 for 57 degrees of freedom
# Null hypothesis probability = 9.878181e-33
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.147e-07 9.550e-09
25- 50 6.054e-07 1.855e-08
50-150 1.328e-06 3.950e-08
15-150 2.248e-06 6.700e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.69820 (-1.11296 1.23488)
R1^2/D10^2 : 10.9618 (-3.45442 5.67601)
kT2 [keV] : 33.4209 (-3.37399 4.77883)
R2^2/D10^2 : 0.235644 (-0.0840517 0.0882061)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.56 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Null hypothesis probability = 4.534792e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.969e-07 2.095e-08
25- 50 5.663e-07 4.000e-08
50-150 1.965e-06 1.680e-07
15-150 2.728e-06 1.905e-07
Plot creation:
Tue Feb 5 03:38:49 EST 2019