batgrbproduct analysis for trigger=756953
batgrbproduct Analysis for Trigger=756953
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): Tue Jun 13 18:47:50 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger756953/GCN5_download_cron
======================================================================
Trigger: 00756953 Segment: 000
BAT Trigger Time: 518993728 [s; MET]
Trigger Stop: 518993792 [s; MET]
UTC: 2017-06-12T20:55:08.793100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 262.731390156754 Dec: -5.97861054422321 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 5.98
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 5.98
Flight Position: [ source = BAT ]
RA: 262.731390156754 Dec: -5.97861054422321 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.632430933182 Dec: -5.96873674180824 [deg; J2000]
{ 17h 30m 31.8s , -05d 58' 07.5" }
+/- 3.73506948107132 [arcmin] (estimated 90% radius based on SNR)
+/- 2.17274150875337 [arcmin] (formal 1-sigma fit error)
SNR: 4.62965714303893
Angular difference between Flight and Ground position is 5.934954 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
T50: 64 +/-
Measured from: 0
to: 64 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 64 second)
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 64 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.248954 0.200597 0.037183 -0.048936
0.060244 0.053191 0.043554 0.037566 [error]
Peak 0.248954 0.200597 0.037183 -0.048936
0.060244 0.053191 0.043554 0.037566 [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 6.63e-08 6.09e-08 3.87e-08 3.77e-08 1.82e-07 2.03e-07 erg/cm2
Error 2.42e-08 2.39e-08 2.80e-08 5.78e-08 7.39e-08 1.04e-07 erg/cm2
Peak flux Power-law 3.42e-02 1.76e-02 5.59e-03 2.27e-03 5.87e-02 5.96e-02 ph/cm2/s
Error 1.27e-02 6.68e-03 3.92e-03 3.25e-03 1.93e-02 1.98e-02 ph/cm2/s
Fluence Cutoff-PL 7.51e-08 7.12e-08 4.45e-10 4.44e-17 1.47e-07 1.47e-07 erg/cm2
Error 2.45e-08 3.06e-08 2.33e-09 5.43e-13 4.13e-08 4.13e-08 erg/cm2
Peak flux Cutoff-PL 3.65e-02 2.27e-02 7.86e-05 3.82e-12 5.93e-02 5.93e-02 ph/cm2/s
Error 1.23e-02 9.01e-03 4.05e-04 5.04e-08 1.65e-02 1.65e-02 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 2.648 0.672 - - 2.72e-04 1.49e-04 82.140 57
CPL -9.965 0.000 25.0 0.0 5.22e+05 0.00e+00 71.750 56
The chi2 of BB fit is 75.97 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 2.648 0.672 - - 2.72e-04 1.49e-04 82.140 57
CPL -9.965 0.000 25.0 0.0 5.22e+05 0.00e+00 71.750 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 64.000 0.000 64.000
T90 64.000 0.000 64.000
T50 64.000 0.000 64.000
Peak 64.000 0.000 64.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.6324 -5.9687 0.0417 8.3 -172.7 0.4946 4.6 TRIG_00756953
------------------------------------------
Foreground time interval of the image:
0.000 64.000 (delta_t = 64.000 [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 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64755 ( -0.609242 0.734699 )
Norm@50keV : 2.72202E-04 ( -0.000141529 0.000156033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.14 using 59 PHA bins.
# Reduced chi-squared = 1.441 for 57 degrees of freedom
# Null hypothesis probability = 1.626808e-02
Photon flux (15-150 keV) in 64 sec: 5.86780E-02 ( -0.0192675 0.0194073 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81594e-07 ( -6.93907e-08 7.84384e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.96537 ( )
Epeak [keV] : 25.0048 ( )
Norm@50keV : 5.21954E+05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.75 using 59 PHA bins.
# Reduced chi-squared = 1.281 for 56 degrees of freedom
# Null hypothesis probability = 7.647009e-02
Photon flux (15-150 keV) in 64 sec: 5.92780E-02 5.89613E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24253e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.58553 -5 )
beta : -6.40716 ( 6.40666 13.008 )
Epeak [keV] : 24.4522 ( -3.67641 4.01758 )
Norm@50keV : 118.190 ( -33.5354 264.912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.52 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 55 degrees of freedom
# Null hypothesis probability = 4.830380e-02
Photon flux (15-150 keV) in 64 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] : 5.87939 (-1.21153 1.58431)
R^2/D10^2 : 0.265424 (-0.264865 0.475377)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.97 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 57 degrees of freedom
# Null hypothesis probability = 4.731982e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.574e-08 4.490e-08
25- 50 7.224e-08 4.653e-08
50-150 6.082e-09 5.677e-09
15-150 1.541e-07 9.258e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.5467 (-9.12888 21.3886)
Norm : 0.678964 (-0.346512 0.682414)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.63 using 59 PHA bins.
# Reduced chi-squared = 1.397 for 57 degrees of freedom
# Null hypothesis probability = 2.554753e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.160e-08 4.344e-08
25- 50 6.630e-08 4.147e-08
50-150 2.244e-08 1.970e-08
15-150 1.603e-07 1.049e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.85204 (-5.88938 28.0804)
R1^2/D10^2 : 0.261686 (-0.257837 -0.257837)
kT2 [keV] : 5.86643 (-5.92181 -5.92181)
R2^2/D10^2 : 9.28710E-03 (-0.00613033 -0.00613033)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.97 using 59 PHA bins.
# Reduced chi-squared = 1.381 for 55 degrees of freedom
# Null hypothesis probability = 3.202735e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.609e-08 2.083e+00
25- 50 7.184e-08 1.762e+01
50-150 5.934e-09 4.346e+02
15-150 1.539e-07 4.074e+02
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64755 ( -0.609242 0.734699 )
Norm@50keV : 2.72202E-04 ( -0.000141529 0.000156033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.14 using 59 PHA bins.
# Reduced chi-squared = 1.441 for 57 degrees of freedom
# Null hypothesis probability = 1.626808e-02
Photon flux (15-150 keV) in 64 sec: 5.86780E-02 ( -0.0192675 0.0194073 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.81594e-07 ( -6.93907e-08 7.84384e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.96537 ( )
Epeak [keV] : 25.0048 ( )
Norm@50keV : 5.21954E+05 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 71.75 using 59 PHA bins.
# Reduced chi-squared = 1.281 for 56 degrees of freedom
# Null hypothesis probability = 7.647009e-02
Photon flux (15-150 keV) in 64 sec: 5.92780E-02 5.89613E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.24253e-18 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -3.58553 -5 )
beta : -6.40716 ( 6.40666 13.008 )
Epeak [keV] : 24.4522 ( -3.67641 4.01758 )
Norm@50keV : 118.190 ( -33.5354 264.912 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.52 using 59 PHA bins.
# Reduced chi-squared = 1.337 for 55 degrees of freedom
# Null hypothesis probability = 4.830380e-02
Photon flux (15-150 keV) in 64 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] : 5.87939 (-1.21153 1.58431)
R^2/D10^2 : 0.265424 (-0.264865 0.475377)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.97 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 57 degrees of freedom
# Null hypothesis probability = 4.731982e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.574e-08 4.496e-08
25- 50 7.224e-08 4.605e-08
50-150 6.082e-09 5.165e-09
15-150 1.541e-07 9.542e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 21.5467 (-9.12888 21.3886)
Norm : 0.678964 (-0.346512 0.682414)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.63 using 59 PHA bins.
# Reduced chi-squared = 1.397 for 57 degrees of freedom
# Null hypothesis probability = 2.554753e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.160e-08 4.389e-08
25- 50 6.630e-08 4.269e-08
50-150 2.244e-08 2.086e-08
15-150 1.603e-07 1.016e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.85204 (-5.88938 28.0804)
R1^2/D10^2 : 0.261686 (-0.257837 -0.257837)
kT2 [keV] : 5.86643 (-5.92181 -5.92181)
R2^2/D10^2 : 9.28710E-03 (-0.00613033 -0.00613033)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.97 using 59 PHA bins.
# Reduced chi-squared = 1.381 for 55 degrees of freedom
# Null hypothesis probability = 3.202735e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.609e-08 1.804e+00
25- 50 7.184e-08 1.781e+01
50-150 5.934e-09 4.570e+02
15-150 1.539e-07 4.288e+02
Plot creation:
Tue Jun 13 19:18:39 EDT 2017