batgrbproduct analysis for trigger=780207
batgrbproduct Analysis for Trigger=780207
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 12:11:26 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger780207/GCN5_download_cron
======================================================================
Trigger: 00780207 Segment: 000
BAT Trigger Time: 530083259.668 [s; MET]
Trigger Stop: 530083259.684 [s; MET]
UTC: 2017-10-19T05:20:39.804720 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 251.803894225799 Dec: -45.884152200453 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 22.46
Image Trigger?: NO
Rate S/N Ratio: 255.998046867549 [ if not an image trigger ]
Image S/N Ratio: 22.46
Flight Position: [ source = BAT ]
RA: 251.803894225799 Dec: -45.884152200453 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 251.80927752734 Dec: -45.8746981334368 [deg; J2000]
{ 16h 47m 14.2s , -45d 52' 28.9" }
+/- 0.666751293768696 [arcmin] (estimated 90% radius based on SNR)
+/- 0.268464322311605 [arcmin] (formal 1-sigma fit error)
SNR: 54.2748422544608
Angular difference between Flight and Ground position is 0.610187 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 0.135999917984009 +/- 0.0164923981003274
Measured from: -0.103999853134155
to: 0.0320000648498535 [s; relative to TRIGTIME]
T50: 0.015999972820282 +/- 0.00400000810623169
Measured from: 1.19209289550781e-07
to: 0.0160000920295715 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.533999979496002
to: 0.466000020503998 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.12799996137619
to: 0.0559999942779541 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.387735 0.345623 0.095797 0.002692
0.009400 0.008782 0.005103 0.001998 [error]
Peak 0.393161 0.362068 0.100240 0.008178
0.011491 0.010522 0.006906 0.004337 [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 1.39e-07 1.20e-07 7.14e-08 6.37e-08 3.58e-07 3.94e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 4.37e+00 2.38e+00 8.08e-01 3.57e-01 7.75e+00 7.91e+00 ph/cm2/s
Error 2.67e-01 9.76e-02 5.50e-02 4.54e-02 3.45e-01 3.43e-01 ph/cm2/s
Fluence Cutoff-PL 1.12e-07 1.42e-07 7.11e-08 1.12e-08 3.35e-07 3.37e-07 erg/cm2
Error 8.53e-09 5.99e-09 5.54e-09 3.91e-09 1.37e-08 1.43e-08 erg/cm2
Peak flux Cutoff-PL 3.72e+00 2.69e+00 7.45e-01 7.11e-02 7.22e+00 7.23e+00 ph/cm2/s
Error 3.18e-01 1.32e-01 7.21e-02 3.45e-02 3.72e-01 3.74e-01 ph/cm2/s
Fluence Band 1.11e-07 1.42e-07 7.09e-08 1.12e-08 3.35e-07 3.36e-07 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 2.753 0.000 - - 1.79e-01 0.00e+00 140.080 57
CPL 1.034 0.359 24.4 4.2 1.61e+00 7.90e-01 40.780 56
The chi2 of BB fit is 127.80 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 2.557 0.079 - - 3.81e-02 1.98e-03 87.260 57
CPL 1.092 0.457 24.8 5.3 2.72e-01 1.85e-01 44.390 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.184 -0.128 0.056
T90 0.136 -0.104 0.032
T50 0.016 0.000 0.016
Peak 1.000 -0.534 0.466
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
251.8093 -45.8747 0.0035 0.0 112.2 0.8273 54.3 TRIG_00780207
------------------------------------------
Foreground time interval of the image:
-0.128 0.056 (delta_t = 0.184 [sec])
Background time interval of the image:
-239.668 -187.238 (delta_t = 52.430 [sec])
-185.668 -0.128 (delta_t = 185.540 [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 -0.128 sec. to 0.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.75267 ( )
Norm@50keV : 0.179499 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 140.08 using 59 PHA bins.
# Reduced chi-squared = 2.4576 for 57 degrees of freedom
# Null hypothesis probability = 6.035212e-09
Photon flux (15-150 keV) in 0.184 sec: 41.4983 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.58071e-07 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.128 sec. to 0.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03447 ( -0.374956 0.343866 )
Epeak [keV] : 24.4291 ( -4.87101 3.57105 )
Norm@50keV : 1.61219 ( -0.573774 1.00589 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.78 using 59 PHA bins.
# Reduced chi-squared = 0.7283 for 56 degrees of freedom
# Null hypothesis probability = 9.368795e-01
Photon flux (15-150 keV) in 0.184 sec: 37.9155 ( -1.7881 1.7989 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.35147e-07 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.128 sec. to 0.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04658 ( -0.329444 0.132251 )
beta : -9.37167 ( 9.37167 19.3714 )
Epeak [keV] : 24.3236 ( -4.67759 3.57561 )
Norm@50keV : 1.58481 ( -0.543311 1.06505 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.79 using 59 PHA bins.
# Reduced chi-squared = 0.7416 for 55 degrees of freedom
# Null hypothesis probability = 9.233823e-01
Photon flux (15-150 keV) in 0.184 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.34518e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.67382 ( )
R^2/D10^2 : 29.5959 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 127.80 using 59 PHA bins.
# Reduced chi-squared = 2.2421 for 57 degrees of freedom
# Null hypothesis probability = 2.385993e-07
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.816e-08 5.060e-09
25- 50 1.567e-07 5.805e-09
50-150 5.331e-08 5.134e-09
15-150 2.881e-07 1.104e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.2300 (-2.01505 2.16229)
Norm : 302.884 (-22.3215 24.1931)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.04 using 59 PHA bins.
# Reduced chi-squared = 0.7551 for 57 degrees of freedom
# Null hypothesis probability = 9.144244e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.175e-07 6.072e-09
25- 50 1.395e-07 5.042e-09
50-150 8.374e-08 6.514e-09
15-150 3.407e-07 1.251e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.23016 (-0.690157 0.712423)
R1^2/D10^2 : 163.209 (-61.508 121.366)
kT2 [keV] : 12.7113 (-1.22758 1.57417)
R2^2/D10^2 : 3.64710 (-1.76754 2.76046)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.46 using 59 PHA bins.
# Reduced chi-squared = 0.7175 for 55 degrees of freedom
# Null hypothesis probability = 9.434485e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.101e-07 1.449e-08
25- 50 1.408e-07 1.755e-08
50-150 8.109e-08 1.386e-08
15-150 3.320e-07 3.505e-08
Peak spectrum fit
Power-law model
Time interval is from -0.534 sec. to 0.466 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55686 ( -0.0776408 0.0793784 )
Norm@50keV : 3.80974E-02 ( -0.00199035 0.00197699 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 87.26 using 59 PHA bins.
# Reduced chi-squared = 1.531 for 57 degrees of freedom
# Null hypothesis probability = 6.087500e-03
Photon flux (15-150 keV) in 1 sec: 7.75258 ( -0.34473 0.345794 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.87085e-07 ( -1.6271e-08 1.62928e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.534 sec. to 0.466 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09228 ( -0.481659 0.433243 )
Epeak [keV] : 24.7700 ( -6.58591 4.10348 )
Norm@50keV : 0.271669 ( -0.119441 0.250422 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.39 using 59 PHA bins.
# Reduced chi-squared = 0.7927 for 56 degrees of freedom
# Null hypothesis probability = 8.685066e-01
Photon flux (15-150 keV) in 1 sec: 7.22295 ( -0.37069 0.37246 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.51699e-07 ( -1.773e-08 1.8046e-08 ) ergs/cm2
Band function
Time interval is from -0.534 sec. to 0.466 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.09287 ( -0.256296 0.189905 )
beta : -10.00000 ( 10 2.28457e-06 )
Epeak [keV] : 24.7606 ( -1.78694 4.10805 )
Norm@50keV : 0.271410 ( -0.119163 0.250671 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.39 using 59 PHA bins.
# Reduced chi-squared = 0.8071 for 55 degrees of freedom
# Null hypothesis probability = 8.462658e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.56083e-07 ( -3.56076e-07 -1.7785e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.46597 (-0.347235 0.36005)
R^2/D10^2 : 6.29874 (-1.04832 1.26378)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 102.37 using 59 PHA bins.
# Reduced chi-squared = 1.7960 for 57 degrees of freedom
# Null hypothesis probability = 2.137549e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.487e-08 6.005e-09
25- 50 1.635e-07 6.450e-09
50-150 5.154e-08 6.160e-09
15-150 2.999e-07 1.280e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 34.4129 (-2.80159 3.13165)
Norm : 54.4419 (-4.66984 5.13173)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.11 using 59 PHA bins.
# Reduced chi-squared = 0.7913 for 57 degrees of freedom
# Null hypothesis probability = 8.726186e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.181e-07 6.800e-09
25- 50 1.450e-07 5.900e-09
50-150 9.434e-08 9.775e-09
15-150 3.574e-07 1.640e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.66019 (-1.02231 0.984784)
R1^2/D10^2 : 23.5719 (-9.60916 23.5404)
kT2 [keV] : 13.8241 (-2.40168 4.29734)
R2^2/D10^2 : 0.452460 (-0.335223 0.800885)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.04 using 59 PHA bins.
# Reduced chi-squared = 0.8189 for 55 degrees of freedom
# Null hypothesis probability = 8.287471e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.101e-07 1.737e-08
25- 50 1.476e-07 2.255e-08
50-150 8.971e-08 3.583e-08
15-150 3.474e-07 7.205e-08
Plot creation:
Fri Oct 20 12:15:48 EDT 2017