batgrbproduct analysis for trigger=912102
batgrbproduct Analysis for Trigger=912102
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 Jun 30 10:27:53 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger912102/batgroup_hand_proc
======================================================================
Trigger: 00912102 Segment: 000
BAT Trigger Time: 583567351.808 [s; MET]
Trigger Stop: 583567352.832 [s; MET]
UTC: 2019-06-30T06:02:08.648040 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 223.669276535539 Dec: 41.521090175186 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.43
Image Trigger?: NO
Rate S/N Ratio: 13.4164078649987 [ if not an image trigger ]
Image S/N Ratio: 8.43
Flight Position: [ source = BAT ]
RA: 223.669276535539 Dec: 41.521090175186 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 223.729030443971 Dec: 41.5284329776673 [deg; J2000]
{ 14h 54m 55.0s , +41d 31' 42.4" }
+/- 1.97845744865347 [arcmin] (estimated 90% radius based on SNR)
+/- 0.974815704449654 [arcmin] (formal 1-sigma fit error)
SNR: 11.4761047207586
Angular difference between Flight and Ground position is 2.720071 arcmin
Partial Coding Fraction: 1.03125 [ including projection effects ]
Duration
T90: 5.567999958992 +/- 0.902904151689883
Measured from: -1.30400002002716
to: 4.26399993896484 [s; relative to TRIGTIME]
T50: 2.22399985790253 +/- 1.33252846376747
Measured from: -0.115999937057495
to: 2.10799992084503 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.187999963760376
to: 0.812000036239624 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.68400001525879
to: 4.7039999961853 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.129762 0.159406 0.128530 0.033505
0.020681 0.020183 0.018335 0.016306 [error]
Peak 0.027412 0.051678 0.052343 0.004100
0.008494 0.008404 0.007834 0.006599 [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 3.17e-08 6.37e-08 9.95e-08 3.43e-07 2.77e-07 5.37e-07 erg/cm2
Error 7.52e-09 9.01e-09 1.75e-08 1.34e-07 4.28e-08 1.46e-07 erg/cm2
Peak flux Power-law 2.46e-01 3.22e-01 3.10e-01 5.31e-01 1.05e+00 1.41e+00 ph/cm2/s
Error 8.59e-02 6.84e-02 5.91e-02 2.22e-01 1.86e-01 2.65e-01 ph/cm2/s
Fluence Cutoff-PL 3.14e-08 6.42e-08 1.00e-07 2.98e-07 2.76e-07 4.90e-07 erg/cm2
Error 8.40e-09 1.02e-08 1.84e-08 2.82e-07 4.62e-08 2.12e-07 erg/cm2
Peak flux Cutoff-PL 2.12e-01 3.30e-01 3.30e-01 3.19e-01 1.03e+00 1.19e+00 ph/cm2/s
Error 1.07e-01 7.52e-02 7.26e-02 2.61e-01 1.94e-01 3.69e-01 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 1.356 0.242 - - 4.45e-03 6.00e-04 55.670 57
CPL 1.285 1.193 505.3 0.0 4.83e-03 5.77e-03 55.650 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 1.056 0.306 - - 9.12e-03 1.57e-03 56.120 57
CPL 0.504 1.075 156.1 0.0 1.60e-02 2.68e-02 55.420 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: 2.624000 sec.
T50 in the 50-300 keV band: 1.088000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 6.388 -1.684 4.704
T90 5.568 -1.304 4.264
T50 2.224 -0.116 2.108
Peak 1.000 -0.188 0.812
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
223.7290 41.5284 0.0168 8.0327 -123.7015 0.4269857 11.476 TRIG_00912102
Foreground time interval of the image:
-1.684 4.704 (delta_t = 6.388 [sec])
Background time interval of the image:
-239.808 -180.019 (delta_t = 59.789 [sec])
-179.808 -132.479 (delta_t = 47.329 [sec])
-129.808 -1.684 (delta_t = 128.124 [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 -1.684 sec. to 4.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35648 ( -0.241946 0.242725 )
Norm@50keV : 4.44992E-03 ( -0.000601686 0.000598289 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 0.9767 for 57 degrees of freedom
# Null hypothesis probability = 5.249662e-01
Photon flux (15-150 keV) in 6.388 sec: 0.536806 ( -0.0719499 0.0720854 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.77233e-07 ( -4.23955e-08 4.31327e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.684 sec. to 4.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28503 ( -1.02904 1.35654 )
Epeak [keV] : 505.294 ( -505.294 -505.294 )
Norm@50keV : 4.83407E-03 ( -0.000967402 0.0105711 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.65 using 59 PHA bins.
# Reduced chi-squared = 0.9938 for 56 degrees of freedom
# Null hypothesis probability = 4.878779e-01
Photon flux (15-150 keV) in 6.388 sec: 0.534906 ( -0.075708 0.073611 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75614e-07 ( -4.78742e-08 4.44509e-08 ) ergs/cm2
Band function
Time interval is from -1.684 sec. to 4.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.979090 ( 0.997698 5.97095 )
beta : -1.43824 ( 1.43467 0.317694 )
Epeak [keV] : 106.953 ( -118.869 -118.869 )
Norm@50keV : 7.35204E-03 ( -0.00288392 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.62 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 55 degrees of freedom
# Null hypothesis probability = 4.513064e-01
Photon flux (15-150 keV) in 6.388 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] : 16.0572 (-2.75866 3.4937)
R^2/D10^2 : 4.85391E-02 (-0.0234565 0.0438236)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.45 using 59 PHA bins.
# Reduced chi-squared = 1.201 for 57 degrees of freedom
# Null hypothesis probability = 1.425111e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.652e-08 4.424e-09
25- 50 6.971e-08 1.487e-08
50-150 1.258e-07 3.810e-08
15-150 2.120e-07 4.398e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-62.8175 -200)
Norm : 2.20126 (-0.292504 0.292504)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.49 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.570177e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.502e-08 1.966e-08
25- 50 6.736e-08 3.766e-08
50-150 1.477e-07 8.180e-08
15-150 2.501e-07 1.409e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.59542 (-4.00012 4.93112)
R1^2/D10^2 : 0.393067 (-0.295458 5.8403)
kT2 [keV] : 30.2706 (-11.9277 -30.4114)
R2^2/D10^2 : 4.66782E-03 (-0.00433094 0.017872)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.63 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.141413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.938e-08 1.632e-08
25- 50 6.644e-08 3.545e-08
50-150 1.786e-07 9.917e-08
15-150 2.744e-07 1.404e-07
Peak spectrum fit
Power-law model
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05622 ( -0.311481 0.300103 )
Norm@50keV : 9.11921E-03 ( -0.00157506 0.00157093 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.12 using 59 PHA bins.
# Reduced chi-squared = 0.9846 for 57 degrees of freedom
# Null hypothesis probability = 5.079259e-01
Photon flux (15-150 keV) in 1 sec: 1.05368 ( -0.185722 0.186588 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.67181e-08 ( -1.817e-08 1.84004e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.503826 ( -1.44879 0.701646 )
Epeak [keV] : 156.054 ( -156.029 -156.029 )
Norm@50keV : 1.59812E-02 ( -0.0081399 0.0455343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.42 using 59 PHA bins.
# Reduced chi-squared = 0.9897 for 56 degrees of freedom
# Null hypothesis probability = 4.966330e-01
Photon flux (15-150 keV) in 1 sec: 1.02671 ( -0.194346 0.1942 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.4138e-08 ( -1.92313e-08 1.9252e-08 ) ergs/cm2
Band function
Time interval is from -0.188 sec. to 0.812 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.553433 ( -0.579009 1.46083 )
beta : -9.36791 ( 9.3716 19.3716 )
Epeak [keV] : 169.456 ( -88.2752 386.361 )
Norm@50keV : 1.50364E-02 ( -0.00535721 0.0248919 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.43 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 55 degrees of freedom
# Null hypothesis probability = 4.582670e-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] : 22.2387 (-4.56316 6.19637)
R^2/D10^2 : 3.60949E-02 (-0.0192483 0.038753)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.41 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.877870e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.287e-09 1.253e-09
25- 50 1.749e-08 5.877e-09
50-150 6.465e-08 2.322e-08
15-150 8.543e-08 2.610e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-52.1305 -200)
Norm : 4.31453 (-0.768374 0.768374)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.02 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.718101e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-08 6.235e-09
25- 50 2.068e-08 1.182e-08
50-150 4.535e-08 2.608e-08
15-150 7.677e-08 4.467e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.78932 (-3.69147 6.34251)
R1^2/D10^2 : 0.769943 (-0.688751 3.81642)
kT2 [keV] : 29.0875 (-7.99808 22.5532)
R2^2/D10^2 : 1.38433E-02 (-0.0115719 0.0161584)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.20 using 59 PHA bins.
# Reduced chi-squared = 0.9855 for 55 degrees of freedom
# Null hypothesis probability = 5.051285e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.385e-09 4.416e-09
25- 50 1.849e-08 1.019e-08
50-150 6.979e-08 4.137e-08
15-150 9.566e-08 4.972e-08
Plot creation:
Sun Jun 30 10:34:54 EDT 2019