batgrbproduct Analysis for Trigger=646786
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 28 00:57:24 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger646786/batgroup_hand_proc
======================================================================
Trigger: 00646786 Segment: 000
BAT Trigger Time: 457042986.56 [s; MET]
Trigger Stop: 457042990.656 [s; MET]
UTC: 2015-06-26T20:22:52.787720 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 187.672182135 Dec: 66.7793620338311 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.54
Image Trigger?: NO
Rate S/N Ratio: 12.1243556529821 [ if not an image trigger ]
Image S/N Ratio: 7.54
Flight Position: [ source = BAT ]
RA: 187.672182135 Dec: 66.7793620338311 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 187.62749104938 Dec: 66.7943234671629 [deg; J2000]
{ 12h 30m 30.6s , +66d 47' 39.6" }
+/- 1.9221031311724 [arcmin] (estimated 90% radius based on SNR)
+/- 1.19050777993638 [arcmin] (formal 1-sigma fit error)
SNR: 11.9597778826403
Angular difference between Flight and Ground position is 1.386684 arcmin
Partial Coding Fraction: 0.3554688 [ including projection effects ]
Duration
T90: 48 +/- 22.6274169979695
Measured from: -15.5600000023842
to: 32.4399999976158 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 0.439999997615814
to: 16.4399999976158 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 7.93999999761581
to: 8.93999999761581 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.5600000023842
to: 32.4399999976158 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.350886 0.477728 0.501039 0.074514
0.062735 0.063111 0.055225 0.046292 [error]
Peak 0.015560 0.036083 0.006983 -0.006461
0.009412 0.009340 0.008174 0.006544 [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 1.17e-07 2.34e-07 3.64e-07 1.25e-06 1.02e-06 1.97e-06 erg/cm2
Error 2.76e-08 3.32e-08 5.20e-08 4.00e-07 1.31e-07 4.29e-07 erg/cm2
Peak flux Power-law 2.39e-01 1.92e-01 1.04e-01 8.21e-02 5.71e-01 6.16e-01 ph/cm2/s
Error 1.46e-01 8.18e-02 6.16e-02 1.07e-01 2.45e-01 2.62e-01 ph/cm2/s
Fluence Cutoff-PL 1.10e-07 2.38e-07 3.75e-07 9.24e-07 1.01e-06 1.65e-06 erg/cm2
Error 3.33e-08 3.65e-08 6.11e-08 6.44e-07 1.35e-07 6.48e-07 erg/cm2
Peak flux Cutoff-PL 1.53e-01 3.06e-01 1.54e-02 5.01e-07 4.74e-01 4.74e-01 ph/cm2/s
Error 1.70e-01 1.29e-01 6.78e-02 4.69e-02 2.23e-01 2.23e-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 1.359 0.214 - - 2.17e-03 2.65e-04 55.640 57
CPL 1.118 0.667 207.7 0.0 2.79e-03 3.21e-03 55.360 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 1.885 0.754 - - 4.01e-03 1.92e-03 57.510 57
CPL -4.536 0.000 33.9 0.0 5.70e+01 0.00e+00 55.110 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: 31.680000 sec.
T50 in the 50-300 keV band: 15.552000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 48.000 -15.560 32.440
T90 48.000 -15.560 32.440
T50 16.000 0.440 16.440
Peak 1.000 7.940 8.940
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
187.6275 66.7943 0.0161 44.4770 8.5135 1.6142889 11.960 TRIG_00646786
Foreground time interval of the image:
-15.560 32.440 (delta_t = 48.000 [sec])
Background time interval of the image:
-239.560 -15.560 (delta_t = 224.000 [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 -15.560 sec. to 32.440 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.35872 ( -0.215116 0.212271 )
Norm@50keV : 2.17118E-03 ( -0.000265022 0.00026488 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.64 using 59 PHA bins.
# Reduced chi-squared = 0.9761 for 57 degrees of freedom
# Null hypothesis probability = 5.264083e-01
Photon flux (15-150 keV) in 48 sec: 0.262039 ( -0.0343679 0.0345602 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.01589e-06 ( -1.3066e-07 1.3132e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.560 sec. to 32.440 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11841 ( -0.895753 0.439063 )
Epeak [keV] : 207.715 ( -207.753 -207.753 )
Norm@50keV : 2.79263E-03 ( -0.00242703 0.00399316 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9886 for 56 degrees of freedom
# Null hypothesis probability = 4.989797e-01
Photon flux (15-150 keV) in 48 sec: 0.258986 ( -0.035726 0.035759 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00711e-06 ( -1.35163e-07 1.34635e-07 ) ergs/cm2
Band function
Time interval is from -15.560 sec. to 32.440 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.10963 ( 1.01044 5.97889 )
beta : -4.65500 ( 9.22889 17.6889 )
Epeak [keV] : 206.383 ( -102.95 -206.569 )
Norm@50keV : 2.81810E-03 ( -0.000629325 0.00375662 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 55 degrees of freedom
# Null hypothesis probability = 4.607301e-01
Photon flux (15-150 keV) in 48 sec: 0.258801 ( ) 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] : 19.5328 (-2.84921 3.47056)
R^2/D10^2 : 1.24217E-02 (-0.00532681 0.00896547)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.22 using 59 PHA bins.
# Reduced chi-squared = 1.232 for 57 degrees of freedom
# Null hypothesis probability = 1.122629e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.426e-08 1.110e-08
25- 50 2.170e-07 4.618e-08
50-150 6.115e-07 1.373e-07
15-150 8.727e-07 1.440e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 1.10406 (-0.135702 0.13567)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.39 using 59 PHA bins.
# Reduced chi-squared = 1.024 for 57 degrees of freedom
# Null hypothesis probability = 4.239635e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.320e-07 7.445e-08
25- 50 2.539e-07 1.421e-07
50-150 5.568e-07 2.990e-07
15-150 9.426e-07 5.158e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.17437 (-2.00304 2.67447)
R1^2/D10^2 : 0.384581 (-0.282099 1.51695)
kT2 [keV] : 27.1580 (-5.64804 10.4288)
R2^2/D10^2 : 3.54038E-03 (-0.00234072 0.00267467)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.12 using 59 PHA bins.
# Reduced chi-squared = 0.9657 for 55 degrees of freedom
# Null hypothesis probability = 5.469709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.181e-07 6.432e-08
25- 50 2.261e-07 9.026e-08
50-150 6.716e-07 3.437e-07
15-150 1.016e-06 4.140e-07
Peak spectrum fit
Power-law model
Time interval is from 7.940 sec. to 8.940 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.88529 ( -0.713673 0.793341 )
Norm@50keV : 4.00510E-03 ( -0.00196577 0.00188141 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.51 using 59 PHA bins.
# Reduced chi-squared = 1.009 for 57 degrees of freedom
# Null hypothesis probability = 4.561284e-01
Photon flux (15-150 keV) in 1 sec: 0.571207 ( -0.244781 0.245816 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68188e-08 ( -1.69823e-08 1.78793e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 7.940 sec. to 8.940 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.53591 ( )
Epeak [keV] : 33.9390 ( )
Norm@50keV : 56.9937 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.11 using 59 PHA bins.
# Reduced chi-squared = 0.9842 for 56 degrees of freedom
# Null hypothesis probability = 5.083543e-01
Photon flux (15-150 keV) in 1 sec: 0.474253 ( -0.195438 0.250146 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.29925e-08 ( -9.3867e-09 1.88458e-08 ) ergs/cm2
Band function
Time interval is from 7.940 sec. to 8.940 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -3.34288 ( 3.34252 1.62122 )
Epeak [keV] : 32.7168 ( -13.7344 10.1433 )
Norm@50keV : 136.170 ( -52.7775 3646.11 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9914 for 55 degrees of freedom
# Null hypothesis probability = 4.925494e-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] : 9.04675 (-2.72615 4.48922)
R^2/D10^2 : 0.430106 (-0.430102 1.32916)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
# Reduced chi-squared = 0.9784 for 57 degrees of freedom
# Null hypothesis probability = 5.214289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.872e-09 4.361e-09
25- 50 1.472e-08 9.325e-09
50-150 5.707e-09 4.913e-09
15-150 2.730e-08 1.712e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.7468 (-67.747 -67.747)
Norm : 2.91680 (-1.49948 3.20408)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.10 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 57 degrees of freedom
# Null hypothesis probability = 4.712210e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.456e-09 4.824e-09
25- 50 1.176e-08 7.325e-09
50-150 1.473e-08 1.358e-08
15-150 3.395e-08 2.467e-08
Double BB
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.77 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.44 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.43 using 59 PHA bins.
#Fit statistic : Chi-Squared = 54.33 using 59 PHA bins.
# Reduced chi-squared = 1.014 for 55 degrees of freedom
# Reduced chi-squared = 0.9898 for 55 degrees of freedom
# Reduced chi-squared = 0.9895 for 55 degrees of freedom
# Reduced chi-squared = 0.9879 for 55 degrees of freedom
# Null hypothesis probability = 4.457833e-01
# Null hypothesis probability = 4.960430e-01
# Null hypothesis probability = 4.965372e-01
# Null hypothesis probability = 5.000662e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.870e-09 1.001e-01
25- 50 1.472e-08 8.975e-01
50-150 5.711e-09 2.302e+01
15-150 2.731e-08 2.383e+01
Plot creation:
Sun Jun 28 01:04:14 EDT 2015