batgrbproduct Analysis for Trigger=655721
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): Wed Sep 16 17:42:23 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger655721/batgroup_hand_proc
======================================================================
Trigger: 00655721 Segment: 000
BAT Trigger Time: 464044720 [s; MET]
Trigger Stop: 464044784 [s; MET]
UTC: 2015-09-15T21:18:24.860420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 319.730955300173 Dec: -34.8537258550562 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.23
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.23
Flight Position: [ source = BAT ]
RA: 319.730955300173 Dec: -34.8537258550562 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst; manual analysis ]
RA: 319.6751 Dec: -34.8742 [deg; J2000]
{ 21h 18m 42.0s , -34d -52' -27.1" }
+/- 2.32573256801 [arcmin] (estimated 90% radius based on SNR)
SNR: 9.110
Angular difference between Flight and Ground position is 3.012 arcmin
Partial Coding Fraction: 0.5546875 [ including projection effects ]
Duration
T90: 164.67199999094 +/- 49.7095048872349
Measured from: -57.1759999990463
to: 107.495999991894 [s; relative to TRIGTIME]
T50: 76.5439999699593 +/- 57.2930666582711
Measured from: -17.3679999709129
to: 59.1759999990463 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 17.6840000152588
to: 18.6840000152588 [s; relative to TRIGTIME]
Total Fluence
Measured from: -68.9520000219345
to: 116.776000022888 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.874364 0.558102 0.285663 0.031344
0.111707 0.105538 0.091483 0.083712 [error]
Peak 0.021136 0.019694 0.013197 0.007598
0.008411 0.008008 0.007020 0.006460 [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 2.64e-07 2.64e-07 1.86e-07 2.07e-07 7.96e-07 9.22e-07 erg/cm2
Error 5.61e-08 5.45e-08 7.98e-08 1.71e-07 1.82e-07 2.84e-07 erg/cm2
Peak flux Power-law 1.83e-01 1.58e-01 9.35e-02 8.31e-02 4.70e-01 5.17e-01 ph/cm2/s
Error 1.13e-01 6.55e-02 5.60e-02 1.13e-01 1.94e-01 2.16e-01 ph/cm2/s
Fluence Cutoff-PL 2.65e-07 2.64e-07 1.85e-07 1.89e-07 7.95e-07 9.01e-07 erg/cm2
Error 5.61e-08 5.89e-08 1.34e-07 1.97e-07 1.49e-07 3.17e-07 erg/cm2
Peak flux Cutoff-PL 1.64e-01 1.74e-01 9.48e-02 2.98e-02 4.54e-01 4.62e-01 ph/cm2/s
Error 1.49e-01 8.40e-02 8.00e-02 1.09e-01 1.98e-01 2.34e-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 2.508 0.418 - - 4.28e-04 1.34e-04 39.870 57
CPL 1.986 0.000 1.0 13.9 9.26e-04 0.00e+00 40.450 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 1.756 0.792 - - 3.47e-03 1.64e-03 50.900 57
CPL 0.877 3.559 56.5 -2.7 1.06e-02 2.71e+00 50.690 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 185.728 -68.952 116.776
T90 164.672 -57.176 107.496
T50 76.544 -17.368 59.176
Peak 1.000 17.684 18.684
Image
Pre-slew 15.0-150.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
319.6751 -34.8742 0.0211 24.5739 121.4469 1.4394798 9.110 TRIG_00655721
Foreground time interval of the image:
-63.000 72.101 (delta_t = 135.101 [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 -68.952 sec. to 116.776 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.50805 ( -0.384771 0.450814 )
Norm@50keV : 4.27952E-04 ( -0.000134379 0.000133295 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.87 using 59 PHA bins.
# Reduced chi-squared = 0.6995 for 57 degrees of freedom
# Null hypothesis probability = 9.587916e-01
Photon flux (15-150 keV) in 185.7 sec: 8.44856E-02 ( -0.0143907 0.0143967 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.96412e-07 ( -1.75652e-07 1.88272e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -68.952 sec. to 116.776 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98559 ( -1.98559 -1.98559 )
Epeak [keV] : 0.956874 ( -0.508819 27.2388 )
Norm@50keV : 9.26487E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.45 using 59 PHA bins.
# Reduced chi-squared = 0.7222 for 56 degrees of freedom
# Null hypothesis probability = 9.416359e-01
Photon flux (15-150 keV) in 185.7 sec: 8.44533E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.94961e-07 ( -2.04766e-07 9.39011e-08 ) ergs/cm2
Band function
Time interval is from -68.952 sec. to 116.776 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.89605 ( 1.84523 1.84523 )
beta : -2.61975 ( 2.50797 0.384639 )
Epeak [keV] : 4.68430 ( -3.04879 9996.1 )
Norm@50keV : 1.17990E-03 ( -0.000615823 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.84 using 59 PHA bins.
# Reduced chi-squared = 0.7243 for 55 degrees of freedom
# Null hypothesis probability = 9.382154e-01
Photon flux (15-150 keV) in 185.7 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] : 6.32334 (-1.1546 1.43307)
R^2/D10^2 : 0.237060 (-0.137476 0.334255)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.19 using 59 PHA bins.
# Reduced chi-squared = 0.8104 for 57 degrees of freedom
# Null hypothesis probability = 8.463477e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.513e-07 8.615e-08
25- 50 2.803e-07 1.039e-07
50-150 3.168e-08 1.955e-08
15-150 5.632e-07 1.851e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 29.2548 (-10.9807 21.0976)
Norm : 0.683331 (-0.237472 0.429109)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.49 using 59 PHA bins.
# Reduced chi-squared = 0.7278 for 57 degrees of freedom
# Null hypothesis probability = 9.390232e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.549e-07 6.422e-08
25- 50 2.872e-07 8.400e-08
50-150 1.521e-07 9.693e-08
15-150 6.942e-07 1.782e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.23912 (-1.5471 1.44861)
R1^2/D10^2 : 0.473565 (-0.302497 1.53541)
kT2 [keV] : 26.1008 (-12.1478 -26.1008)
R2^2/D10^2 : 5.13836E-04 (-0.000509361 0.0126302)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.31 using 59 PHA bins.
# Reduced chi-squared = 0.7148 for 55 degrees of freedom
# Null hypothesis probability = 9.454685e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.679e-07 1.516e-07
25- 50 2.519e-07 1.317e-07
50-150 3.302e-07 2.127e-07
15-150 8.500e-07 4.576e-07
Peak spectrum fit
Power-law model
Time interval is from 17.684 sec. to 18.684 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75594 ( -0.74232 0.841189 )
Norm@50keV : 3.46790E-03 ( -0.00169353 0.00158573 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.90 using 59 PHA bins.
# Reduced chi-squared = 0.8930 for 57 degrees of freedom
# Null hypothesis probability = 7.018841e-01
Photon flux (15-150 keV) in 1 sec: 0.469950 ( -0.193807 0.19416 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.1989e-08 ( -1.49232e-08 1.59922e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 17.684 sec. to 18.684 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.876541 ( -5.80077 1.3177 )
Epeak [keV] : 56.4743 ( -50.9931 -56.4728 )
Norm@50keV : 1.06478E-02 ( -0.0106509 5.40379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.69 using 59 PHA bins.
# Reduced chi-squared = 0.9051 for 56 degrees of freedom
# Null hypothesis probability = 6.756021e-01
Photon flux (15-150 keV) in 1 sec: 0.453968 ( -0.195146 0.201784 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.94592e-08 ( -1.4279e-08 1.78307e-08 ) ergs/cm2
Band function
Time interval is from 17.684 sec. to 18.684 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.97774 ( -4.97774 -4.97774 )
beta : -1.91670 ( -1.11786 0.835635 )
Epeak [keV] : 23.6157 ( -23.6157 71.1755 )
Norm@50keV : 662.080 ( -268.626 6.61717e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.53 using 59 PHA bins.
# Reduced chi-squared = 0.9187 for 55 degrees of freedom
# Null hypothesis probability = 6.459003e-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] : 12.9093 (-5.19793 7.92439)
R^2/D10^2 : 8.88969E-02 (-0.0888849 0.486738)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.50 using 59 PHA bins.
# Reduced chi-squared = 0.9035 for 57 degrees of freedom
# Null hypothesis probability = 6.807452e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.142e-09 2.104e-09
25- 50 1.074e-08 6.660e-09
50-150 1.127e-08 8.140e-09
15-150 2.515e-08 1.686e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 102.069 (-102.382 -102.382)
Norm : 2.09152 (-0.936392 1.86046)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.73 using 59 PHA bins.
# Reduced chi-squared = 0.8900 for 57 degrees of freedom
# Null hypothesis probability = 7.078952e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.467e-09 3.408e-09
25- 50 9.491e-09 5.920e-09
50-150 1.556e-08 1.273e-08
15-150 3.052e-08 2.145e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.16523 (-4.11936 -4.11936)
R1^2/D10^2 : 3.43665 (-3.52666 -3.52666)
kT2 [keV] : 16.0843 (-16.0609 -16.0609)
R2^2/D10^2 : 3.39313E-02 (-0.0341212 0.263638)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.12 using 59 PHA bins.
# Reduced chi-squared = 0.9113 for 55 degrees of freedom
# Null hypothesis probability = 6.611658e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.603e-09 3.014e-09
25- 50 9.196e-09 5.525e-09
50-150 1.391e-08 8.640e-09
15-150 2.871e-08 1.630e-08
Plot creation:
Wed Sep 16 18:02:32 EDT 2015