batgrbproduct analysis for trigger=780203
batgrbproduct Analysis for Trigger=780203
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): Fri Oct 20 12:17:30 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger780203/GCN5_download_cron
======================================================================
Trigger: 00780203 Segment: 000
BAT Trigger Time: 530081348.048 [s; MET]
Trigger Stop: 530081348.064 [s; MET]
UTC: 2017-10-19T04:48:48.184840 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 251.79429863101 Dec: -45.8770602293447 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.42
Image Trigger?: NO
Rate S/N Ratio: 39.7869325281555 [ if not an image trigger ]
Image S/N Ratio: 12.42
Flight Position: [ source = BAT ]
RA: 251.79429863101 Dec: -45.8770602293447 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.793016385852 Dec: -45.87726333408 [deg; J2000]
{ 16h 47m 10.3s , -45d 52' 38.1" }
+/- 1.84371535432087 [arcmin] (estimated 90% radius based on SNR)
+/- 0.727766269422305 [arcmin] (formal 1-sigma fit error)
SNR: 12.6927493827264
Angular difference between Flight and Ground position is 0.054931 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 0.015999972820282 +/- 0.00565682356674367
Measured from: 1.19209289550781e-07
to: 0.0160000920295715 [s; relative to TRIGTIME]
T50: 0.00399994850158691 +/- 0.00565686571343518
Measured from: 0.00400012731552124
to: 0.00800007581710815 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.489999949932098
to: 0.510000050067902 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0160000324249268 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.019680 0.018021 0.004976 -0.000005
0.002360 0.002243 0.001297 0.000438 [error]
Peak 0.024278 0.017488 0.005765 -0.001397
0.007487 0.007437 0.005692 0.004690 [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 5.95e-09 5.48e-09 3.50e-09 3.43e-09 1.63e-08 1.83e-08 erg/cm2
Error 1.09e-09 9.38e-10 1.08e-09 1.92e-09 2.88e-09 3.85e-09 erg/cm2
Peak flux Power-law 2.32e-01 1.27e-01 4.39e-02 1.97e-02 4.14e-01 4.23e-01 ph/cm2/s
Error 1.14e-01 6.20e-02 4.31e-02 3.34e-02 1.77e-01 1.82e-01 ph/cm2/s
Fluence Cutoff-PL 6.25e-09 7.15e-09 6.88e-10 1.00e-12 1.41e-08 1.41e-08 erg/cm2
Error 1.26e-09 1.50e-09 1.24e-09 9.69e-11 2.45e-09 2.45e-09 erg/cm2
Peak flux Cutoff-PL 2.14e-01 1.61e-01 3.87e-02 2.22e-03 4.16e-01 4.16e-01 ph/cm2/s
Error 1.70e-01 8.57e-02 4.45e-02 2.65e-02 1.73e-01 1.73e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.15e-01 1.60e-01 3.93e-02 2.25e-03 4.17e-01 4.17e-01 ph/cm2/s
Error 1.70e-01 8.56e-02 4.43e-02 -------- 1.73e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.649 0.288 - - 9.77e-02 2.30e-02 54.800 57
CPL 1.000 0.000 50.0 0.0 3.63e-01 0.00e+00 77.670 56
The chi2 of BB fit is 46.49 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 2.537 0.917 - - 2.06e-03 1.40e-03 45.460 57
CPL 0.642 0.000 26.6 0.0 3.18e-02 0.00e+00 44.400 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 0.016 0.000 0.016
T90 0.016 0.000 0.016
T50 0.004 0.004 0.008
Peak 1.000 -0.490 0.510
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.7930 -45.8773 0.0151 32.5 -15.7 0.0461 12.7 TRIG_00780203
------------------------------------------
Foreground time interval of the image:
0.000 0.016 (delta_t = 0.016 [sec])
Background time interval of the image:
-239.048 0.000 (delta_t = 239.048 [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 0.000 sec. to 0.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64876 ( -0.275054 0.301946 )
Norm@50keV : 9.77106E-02 ( -0.0230318 0.0229391 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.80 using 59 PHA bins.
# Reduced chi-squared = 0.9614 for 57 degrees of freedom
# Null hypothesis probability = 5.580583e-01
Photon flux (15-150 keV) in 0.016 sec: 21.0859 ( -3.27857 3.27886 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6345e-08 ( -2.85499e-09 2.9092e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 0.363239 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.67 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 56 degrees of freedom
# Null hypothesis probability = 2.926881e-02
Photon flux (15-150 keV) in 0.016 sec: 21.4762 ( -3.3003 3.2921 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40899e-08 ( -2.38565e-09 2.5235e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.03865 -5 )
beta : -3.92266 ( -1.72045 0.757529 )
Epeak [keV] : 24.5751 ( -2.90752 2.42157 )
Norm@50keV : 3.81624E+04 ( -5612.25 51232.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.77 using 59 PHA bins.
# Reduced chi-squared = 0.7594 for 55 degrees of freedom
# Null hypothesis probability = 9.057243e-01
Photon flux (15-150 keV) in 0.016 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] : 6.39703 (-0.763446 0.86908)
R^2/D10^2 : 65.7441 (-28.7111 49.3802)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.49 using 59 PHA bins.
# Reduced chi-squared = 0.8157 for 57 degrees of freedom
# Null hypothesis probability = 8.385368e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.236e-09 1.553e-09
25- 50 7.127e-09 1.818e-09
50-150 8.427e-10 4.472e-10
15-150 1.421e-08 3.112e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 24.9467 (-5.97382 8.51642)
Norm : 211.084 (-59.08 81.3241)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.78 using 59 PHA bins.
# Reduced chi-squared = 0.8733 for 57 degrees of freedom
# Null hypothesis probability = 7.402979e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.177e-09 1.167e-09
25- 50 6.322e-09 1.382e-09
50-150 2.680e-09 1.384e-09
15-150 1.518e-08 2.983e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.12760 (-0.758345 0.886167)
R1^2/D10^2 : 77.1860 (-35.75 62.5097)
kT2 [keV] : 200.000 (-200 -200)
R2^2/D10^2 : 1.06367E-03 (-0.000772587 0.000768932)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.74 using 59 PHA bins.
#Fit statistic : Chi-Squared = 41.66 using 59 PHA bins.
# Reduced chi-squared = 0.7589 for 55 degrees of freedom
# Reduced chi-squared = 0.7575 for 55 degrees of freedom
# Null hypothesis probability = 9.062538e-01
# Null hypothesis probability = 9.077381e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.386e-09 1.868e-09
25- 50 6.766e-09 2.070e-09
50-150 5.050e-09 2.481e-09
15-150 1.820e-08 5.134e-09
Peak spectrum fit
Power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.53670 ( -0.734583 1.1002 )
Norm@50keV : 2.06102E-03 ( -0.00137312 0.00142413 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.46 using 59 PHA bins.
# Reduced chi-squared = 0.7976 for 57 degrees of freedom
# Null hypothesis probability = 8.643123e-01
Photon flux (15-150 keV) in 1 sec: 0.414147 ( -0.176773 0.17736 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.08164e-08 ( -1.03568e-08 1.16389e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.642018 ( )
Epeak [keV] : 26.6466 ( )
Norm@50keV : 3.17530E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.40 using 59 PHA bins.
# Reduced chi-squared = 0.7929 for 56 degrees of freedom
# Null hypothesis probability = 8.682293e-01
Photon flux (15-150 keV) in 1 sec: 0.415657 ( -0.172711 0.174133 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.9732e-08 ( -9.2114e-09 1.09911e-08 ) ergs/cm2
Band function
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.643663 ( -3.08198 0.839916 )
beta : -10.0000 ( 10 6.75016e-14 )
Epeak [keV] : 26.5650 ( -16.0089 725.827 )
Norm@50keV : 3.18268E-02 ( -0.0317839 233.456 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.40 using 59 PHA bins.
# Reduced chi-squared = 0.8073 for 55 degrees of freedom
# Null hypothesis probability = 8.459232e-01
Photon flux (15-150 keV) in 1 sec: 0.416749 ( 6.58325 -0.17387 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.98688e-08 ( -1.98618e-08 -9.3007e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.83172 (-3.48316 4.6807)
R^2/D10^2 : 0.529644 (-0.524897 5.51991)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.15 using 59 PHA bins.
# Reduced chi-squared = 0.7920 for 57 degrees of freedom
# Null hypothesis probability = 8.716988e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.780e-09 3.667e-09
25- 50 9.746e-09 6.330e-09
50-150 2.385e-09 2.132e-09
15-150 1.791e-08 1.205e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.1287 (-32.1152 58.7506)
Norm : 3.28540 (-1.8166 5.15203)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.52 using 59 PHA bins.
# Reduced chi-squared = 0.7810 for 57 degrees of freedom
# Null hypothesis probability = 8.856167e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.914e-09 4.336e-09
25- 50 8.196e-09 5.345e-09
50-150 4.902e-09 4.218e-09
15-150 2.001e-08 1.408e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.99172 (-4.0089 38.0963)
R1^2/D10^2 : 4.97567 (-5.04234 -5.04234)
kT2 [keV] : 11.2108 (-11.2224 -11.2224)
R2^2/D10^2 : 8.92011E-02 (-0.0891751 3.18025)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.11 using 59 PHA bins.
#Fit statistic : Chi-Squared = 44.10 using 59 PHA bins.
# Reduced chi-squared = 0.8020 for 55 degrees of freedom
# Reduced chi-squared = 0.8017 for 55 degrees of freedom
# Null hypothesis probability = 8.534238e-01
# Null hypothesis probability = 8.538154e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.839e-09 4.013e-09
25- 50 8.380e-09 5.410e-09
50-150 5.072e-09 4.236e-09
15-150 2.029e-08 1.156e-08
Plot creation:
Fri Oct 20 12:22:57 EDT 2017