batgrbproduct analysis for trigger=764204
batgrbproduct Analysis for Trigger=764204
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 Jul 25 14:58:24 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger764204/batgroup_hand_proc
======================================================================
Trigger: 00764204 Segment: 000
BAT Trigger Time: 522550144 [s; MET]
Trigger Stop: 522550208 [s; MET]
UTC: 2017-07-24T00:48:44.583880 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 150.081345377704 Dec: -1.04756718482438 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.43
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.43
Flight Position: [ source = BAT ]
RA: 150.081345377704 Dec: -1.04756718482438 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 150.056957509389 Dec: -1.02526774681023 [deg; J2000]
{ 10h 00m 13.7s , -01d 01' 31.0" }
+/- 2.42695504894035 [arcmin] (estimated 90% radius based on SNR)
+/- 0.927453349590443 [arcmin] (formal 1-sigma fit error)
SNR: 8.57097425473156
Angular difference between Flight and Ground position is 1.982579 arcmin
Partial Coding Fraction: 0.5859375 [ including projection effects ]
Duration
T90: 97.9839999675751 +/- 26.1117944289387
Measured from: -38.7319999933243
to: 59.2519999742508 [s; relative to TRIGTIME]
T50: 43.8799999952316 +/- 22.2856797299761
Measured from: 4.95999997854233
to: 48.839999973774 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 35.9160000085831
to: 36.9160000085831 [s; relative to TRIGTIME]
Total Fluence
Measured from: -45.5920000076294
to: 63.6039999723434 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.440251 0.626526 0.521987 0.162215
0.073358 0.073621 0.064906 0.056678 [error]
Peak 0.026271 0.011610 0.020281 0.010487
0.006871 0.007131 0.006447 0.005450 [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 1.36e-07 2.55e-07 3.70e-07 1.14e-06 1.05e-06 1.90e-06 erg/cm2
Error 3.01e-08 3.43e-08 6.37e-08 4.27e-07 1.54e-07 4.75e-07 erg/cm2
Peak flux Power-law 2.35e-01 1.49e-01 6.06e-02 3.35e-02 4.61e-01 4.78e-01 ph/cm2/s
Error 1.13e-01 6.64e-02 5.46e-02 6.90e-02 1.68e-01 1.84e-01 ph/cm2/s
Fluence Cutoff-PL 1.33e-07 2.59e-07 3.74e-07 9.06e-07 1.04e-06 1.67e-06 erg/cm2
Error 3.41e-08 3.93e-08 5.15e-08 7.07e-07 1.64e-07 6.82e-07 erg/cm2
Peak flux Cutoff-PL 2.41e-01 1.46e-01 5.62e-02 2.88e-02 4.58e-01 4.71e-01 ph/cm2/s
Error 1.11e-01 6.66e-02 6.13e-02 6.85e-02 1.66e-01 1.79e-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 1.465 0.230 - - 1.01e-03 1.32e-04 61.870 57
CPL 1.322 0.641 230.2 0.0 1.19e-03 1.19e-03 61.780 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 2.292 1.083 - - 2.65e-03 2.20e-03 52.820 57
CPL 2.159 0.000 70.2 0.0 2.56e-03 0.00e+00 52.760 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: 35.968000 sec.
T50 in the 50-300 keV band: 17.408000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 109.196 -45.592 63.604
T90 97.984 -38.732 59.252
T50 43.880 4.960 48.840
Peak 1.000 35.916 36.916
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
150.0570 -1.0253 0.0224 25.1537 -69.9243 1.6606691 8.571 TRIG_00764204
Foreground time interval of the image:
-45.592 63.604 (delta_t = 109.196 [sec])
Background time interval of the image:
-142.099 -45.592 (delta_t = 96.507 [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 -45.592 sec. to 63.604 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.46498 ( -0.228776 0.2313 )
Norm@50keV : 1.00738E-03 ( -0.000132982 0.000131904 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.87 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.066508e-01
Photon flux (15-150 keV) in 109.2 sec: 0.124614 ( -0.0161806 0.0162146 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04983e-06 ( -1.52851e-07 1.54934e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -45.592 sec. to 63.604 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.32197 ( -0.910472 0.371527 )
Epeak [keV] : 230.166 ( -236.531 -236.531 )
Norm@50keV : 1.18552E-03 ( -0.000313334 0.00207197 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.78 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 56 degrees of freedom
# Null hypothesis probability = 2.772082e-01
Photon flux (15-150 keV) in 109.2 sec: 0.123774 ( -0.016795 0.016703 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.03915e-06 ( -1.65186e-07 1.63007e-07 ) ergs/cm2
Band function
Time interval is from -45.592 sec. to 63.604 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.25850 ( -0.3385 0.83734 )
beta : -9.36877 ( 9.36801 19.368 )
Epeak [keV] : 192.628 ( -120.839 -192.628 )
Norm@50keV : 1.26371E-03 ( -0.000160897 0.00109935 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.78 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 55 degrees of freedom
# Null hypothesis probability = 2.467195e-01
Photon flux (15-150 keV) in 109.2 sec: 0.123395 ( ) 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] : 15.8807 (-2.7455 3.37196)
R^2/D10^2 : 1.14994E-02 (-0.00553673 0.0106895)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 78.57 using 59 PHA bins.
# Reduced chi-squared = 1.378 for 57 degrees of freedom
# Null hypothesis probability = 3.070313e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.559e-08 1.936e-08
25- 50 2.742e-07 5.678e-08
50-150 4.820e-07 1.288e-07
15-150 8.218e-07 1.584e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-72.9578 -199.363)
Norm : 0.510764 (-0.0651534 0.0651518)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.35 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.917082e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.389e-07 7.868e-08
25- 50 2.672e-07 1.495e-07
50-150 5.859e-07 3.253e-07
15-150 9.920e-07 5.452e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.59874 (-2.42761 2.74071)
R1^2/D10^2 : 0.156071 (-0.108331 0.409298)
kT2 [keV] : 27.1369 (-7.44568 17.1407)
R2^2/D10^2 : 1.51493E-03 (-0.00119884 0.00327521)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.10 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 55 degrees of freedom
# Null hypothesis probability = 2.661254e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.319e-07 7.488e-08
25- 50 2.555e-07 1.287e-07
50-150 6.598e-07 3.694e-07
15-150 1.047e-06 5.498e-07
Peak spectrum fit
Power-law model
Time interval is from 35.916 sec. to 36.916 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.29189 ( -0.880828 1.28548 )
Norm@50keV : 2.65252E-03 ( -0.00264978 0.00174158 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.82 using 59 PHA bins.
# Reduced chi-squared = 0.9267 for 57 degrees of freedom
# Null hypothesis probability = 6.324638e-01
Photon flux (15-150 keV) in 1 sec: 0.461404 ( -0.168262 0.167794 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52908e-08 ( -1.27461e-08 1.53339e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 35.916 sec. to 36.916 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.15948 ( )
Epeak [keV] : 70.2178 ( )
Norm@50keV : 2.56105E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.76 using 59 PHA bins.
# Reduced chi-squared = 0.9421 for 56 degrees of freedom
# Null hypothesis probability = 5.983964e-01
Photon flux (15-150 keV) in 1 sec: 0.458046 ( -0.164906 0.166328 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.49043e-08 ( -1.23422e-08 1.55677e-08 ) ergs/cm2
Band function
Time interval is from 35.916 sec. to 36.916 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.59852 ( 1.60059 1.60059 )
beta : -2.28657 ( 2.29055 0.879687 )
Epeak [keV] : 8.32980 ( -7.84596 -7.84596 )
Norm@50keV : 1.25351E-02 ( -0.0130072 1.9815e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.82 using 59 PHA bins.
# Reduced chi-squared = 0.9604 for 55 degrees of freedom
# Null hypothesis probability = 5.582544e-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] : 5.00573 (-1.56895 2.40107)
R^2/D10^2 : 3.45503 (-3.45503 17.2512)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.49 using 59 PHA bins.
# Reduced chi-squared = 0.9560 for 57 degrees of freedom
# Null hypothesis probability = 5.696521e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.441e-09 5.135e-09
25- 50 5.528e-09 3.734e-09
50-150 2.260e-10 2.365e-10
15-150 1.420e-08 8.820e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 25.3224 (-17.8078 -25.8704)
Norm : 4.04080 (-2.6412 14.9927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.39 using 59 PHA bins.
# Reduced chi-squared = 0.9543 for 57 degrees of freedom
# Null hypothesis probability = 5.734529e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.462e-09 4.592e-09
25- 50 7.711e-09 4.806e-09
50-150 3.341e-09 3.056e-09
15-150 1.851e-08 1.247e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.66295 (-1.56904 2.19935)
R1^2/D10^2 : 4.51565 (-3.64342 17.3071)
kT2 [keV] : 99.5233 (-81.9208 -99.9963)
R2^2/D10^2 : 2.28953E-04 (-0.000201932 0.0118337)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.88 using 59 PHA bins.
# Reduced chi-squared = 0.8887 for 55 degrees of freedom
# Null hypothesis probability = 7.063878e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.375e-09 5.020e-09
25- 50 5.628e-09 3.047e-09
50-150 2.200e-08 1.481e-08
15-150 3.601e-08 2.155e-08
Plot creation:
Tue Jul 25 18:25:24 EDT 2017