batgrbproduct Analysis for Trigger=690638
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun Jun 12 16:54:14 EDT 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger690638/GCN5_download_cron
======================================================================
Trigger: 00690638 Segment: 000
BAT Trigger Time: 487391088 [s; MET]
Trigger Stop: 487391376 [s; MET]
UTC: 2016-06-12T02:24:31.596600 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.011997682738 Dec: -15.4328545811362 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.6
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.6
Flight Position: [ source = BAT ]
RA: 245.011997682738 Dec: -15.4328545811362 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 244.992350781637 Dec: -15.5645611551884 [deg; J2000]
{ 16h 19m 58.2s , -15d 33' 52.4" }
+/- 1.02596334823056 [arcmin] (estimated 90% radius based on SNR)
+/- 0.297414459324074 [arcmin] (formal 1-sigma fit error)
SNR: 29.3234957379677
Angular difference between Flight and Ground position is 7.983622 arcmin
Partial Coding Fraction: 0.6328125 [ including projection effects ]
Duration
T90: 493.735999941826 +/- 53.661705995437
Measured from: -127.931999862194
to: 365.804000079632 [s; relative to TRIGTIME]
T50: 229.05999994278 +/- 40.0120278786996
Measured from: -19.5839998722076
to: 209.476000070572 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 71.2799999713898
to: 72.2799999713898 [s; relative to TRIGTIME]
Total Fluence
Measured from: -179.791999995708
to: 401.315999984741 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 11.683433 0.840889 -0.000752 -0.222718
0.181339 0.162302 0.134445 0.114041 [error]
Peak 0.038894 0.020173 0.016241 -0.000802
0.007835 0.007241 0.005769 0.004724 [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 3.74e-06 4.63e-07 2.48e-08 1.40e-09 4.23e-06 4.23e-06 erg/cm2
Error 3.42e-07 7.35e-08 9.91e-09 9.60e-10 3.42e-07 3.42e-07 erg/cm2
Peak flux Power-law 3.54e-01 2.04e-01 7.42e-02 3.56e-02 6.52e-01 6.68e-01 ph/cm2/s
Error 1.34e-01 6.69e-02 6.35e-02 5.06e-02 1.76e-01 1.83e-01 ph/cm2/s
Fluence Cutoff-PL 3.73e-06 3.03e-07 1.75e-10 1.56e-17 4.03e-06 4.03e-06 erg/cm2
Error 3.79e-07 9.17e-08 1.39e-09 2.31e-13 3.85e-07 3.85e-07 erg/cm2
Peak flux Cutoff-PL 3.56e-01 2.03e-01 7.33e-02 3.46e-02 6.51e-01 6.67e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.76e-01 -------- ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.02e-01 2.92e-03 9.21e-06 2.90e-08 2.04e-01 2.04e-01 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 6.222 0.354 - - 4.76e-05 1.55e-05 64.050 57
CPL 1.000 0.000 50.0 0.0 9.70e-04 0.00e+00 436.700 56
The chi2 of BB fit is 54.29 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 2.457 0.809 - - 3.40e-03 1.77e-03 49.440 57
CPL 1.958 0.000 5.7 0.0 5.66e-03 0.00e+00 50.280 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 581.108 -179.792 401.316
T90 493.736 -127.932 365.804
T50 229.060 -19.584 209.476
Peak 1.000 71.280 72.280
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
244.9924 -15.5646 0.0065 20.5 89.6 12.5606 29.3 TRIG_00690638
------------------------------------------
Foreground time interval of the image:
-79.699 302.601 (delta_t = 382.300 [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 -179.792 sec. to 401.316 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.22197 ( -0.351767 0.356597 )
Norm@50keV : 4.75978E-05 ( -1.34902e-05 1.76011e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.05 using 59 PHA bins.
# Reduced chi-squared = 1.124 for 57 degrees of freedom
# Null hypothesis probability = 2.429610e-01
Photon flux (15-150 keV) in 581.1 sec: 0.245017 ( -0.0213648 0.0214938 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.23144e-06 ( -3.40798e-07 3.42388e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -179.792 sec. to 401.316 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 9.70468E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 436.70 using 59 PHA bins.
# Reduced chi-squared = 7.7982 for 56 degrees of freedom
# Null hypothesis probability = 2.232854e-60
Photon flux (15-150 keV) in 581.1 sec: 0.235708 ( -0.024796 0.024072 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.03236e-06 ( -3.90569e-07 3.79946e-07 ) ergs/cm2
Band function
Time interval is from -179.792 sec. to 401.316 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -7.86345 ( 3.65322 7.86345 )
beta : -6.26358 ( -0.326181 0.386209 )
Epeak [keV] : 275.272 ( -275.272 -275.272 )
Norm@50keV : 6.21857E-03 ( -0.00168769 0.00255122 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.09 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 55 degrees of freedom
# Null hypothesis probability = 1.878360e-01
Photon flux (15-150 keV) in 581.1 sec: 0.204443 ( ) 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] : 2.54474 (-0.152997 0.169497)
R^2/D10^2 : 102.654 (-42.084 70.2767)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9524 for 57 degrees of freedom
# Null hypothesis probability = 5.774063e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.719e-06 5.698e-07
25- 50 2.935e-07 5.561e-08
50-150 1.102e-10 7.179e-11
15-150 4.012e-06 6.715e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.36730 (-0.380864 0.445539)
Norm : 93.3171 (-33.4895 51.8668)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.12 using 59 PHA bins.
# Reduced chi-squared = 0.9670 for 57 degrees of freedom
# Null hypothesis probability = 5.459007e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.769e-06 5.146e-07
25- 50 3.450e-07 6.889e-08
50-150 8.625e-10 5.403e-10
15-150 4.115e-06 5.776e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.52580 ( )
R1^2/D10^2 : 8.55068 ( )
kT2 [keV] : 2.97954 ( )
R2^2/D10^2 : 7.97335E-05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.56 using 59 PHA bins.
# Reduced chi-squared = 2.0102 for 55 degrees of freedom
# Null hypothesis probability = 1.324287e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.369e-06 2.828e-02
25- 50 5.875e-07 2.470e-01
50-150 3.166e-09 6.099e+00
15-150 2.960e-06 6.186e+00
Peak spectrum fit
Power-law model
Time interval is from 71.280 sec. to 72.280 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.45721 ( -0.638646 0.980157 )
Norm@50keV : 3.40400E-03 ( -0.00191156 0.00163539 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.44 using 59 PHA bins.
# Reduced chi-squared = 0.8673 for 57 degrees of freedom
# Null hypothesis probability = 7.515079e-01
Photon flux (15-150 keV) in 1 sec: 0.651560 ( -0.17636 0.176354 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36532e-08 ( -1.23196e-08 1.29128e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 71.280 sec. to 72.280 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95772 ( )
Epeak [keV] : 5.74741 ( )
Norm@50keV : 5.65817E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.28 using 59 PHA bins.
# Reduced chi-squared = 0.8978 for 56 degrees of freedom
# Null hypothesis probability = 6.902985e-01
Photon flux (15-150 keV) in 1 sec: 0.651157 ( -0.176231 0.176224 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.322e-08 ( -1.18173e-08 1.33709e-08 ) ergs/cm2
Band function
Time interval is from 71.280 sec. to 72.280 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.81088 ( 1.81 1.81 )
beta : -2.45703 ( 2.45758 0.638058 )
Epeak [keV] : 3.43806 ( -3.37947 -3.37947 )
Norm@50keV : 1.65609E-02 ( -0.0169186 0.14418 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.44 using 59 PHA bins.
# Reduced chi-squared = 0.8988 for 55 degrees of freedom
# Null hypothesis probability = 6.862917e-01
Photon flux (15-150 keV) in 1 sec: 0.204443 ( ) 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] : 8.59799 (-5.7767 6.70006)
R^2/D10^2 : 0.478332 (-0.477741 368.971)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.76 using 59 PHA bins.
# Reduced chi-squared = 1.031 for 57 degrees of freedom
# Null hypothesis probability = 4.107484e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.102e-08 6.655e-09
25- 50 7.439e-09 4.803e-09
50-150 3.227e-10 3.052e-10
15-150 1.878e-08 1.109e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 44.5717 (-28.2602 99.4025)
Norm : 3.80220 (-1.65178 5.52955)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.78 using 59 PHA bins.
# Reduced chi-squared = 0.9085 for 57 degrees of freedom
# Null hypothesis probability = 6.705334e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.028e-09 4.058e-09
25- 50 1.242e-08 7.081e-09
50-150 1.077e-08 7.862e-09
15-150 3.222e-08 1.792e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.25097 (-1.02613 1.60143)
R1^2/D10^2 : 357.589 (-346.297 88317.5)
kT2 [keV] : 15.5507 (-5.84371 12.5184)
R2^2/D10^2 : 4.13753E-02 (-0.0358198 0.112395)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.54 using 59 PHA bins.
# Reduced chi-squared = 0.8279 for 55 degrees of freedom
# Null hypothesis probability = 8.147443e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.092e-08 6.005e-09
25- 50 8.960e-09 5.320e-09
50-150 1.428e-08 9.725e-09
15-150 3.415e-08 1.843e-08
Plot creation:
Sun Jun 12 17:00:11 EDT 2016