batgrbproduct analysis for trigger=770656
batgrbproduct Analysis for Trigger=770656
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 Sep 5 15:32:05 EDT 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger770656/GCN5_download_cron
======================================================================
Trigger: 00770656 Segment: 000
BAT Trigger Time: 526225536 [s; MET]
Trigger Stop: 526225600 [s; MET]
UTC: 2017-09-04T13:45:16.366120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.825324999378 Dec: -57.2460218525457 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 17.55
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 17.55
Flight Position: [ source = BAT ]
RA: 233.825324999378 Dec: -57.2460218525457 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.839097664741 Dec: -57.2310097825658 [deg; J2000]
{ 15h 35m 21.4s , -57d 13' 51.6" }
+/- 1.29001200903874 [arcmin] (estimated 90% radius based on SNR)
+/- 0.456457454322569 [arcmin] (formal 1-sigma fit error)
SNR: 21.1410865351292
Angular difference between Flight and Ground position is 1.005621 arcmin
Partial Coding Fraction: 1 [ 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 0.940385 0.991632 0.495733 0.002484
0.058006 0.054507 0.045214 0.040004 [error]
Peak 0.940385 0.991632 0.495733 0.002484
0.058006 0.054507 0.045214 0.040004 [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 2.79e-07 3.81e-07 3.83e-07 6.99e-07 1.27e-06 1.74e-06 erg/cm2
Error 2.75e-08 2.52e-08 4.24e-08 1.54e-07 9.77e-08 1.99e-07 erg/cm2
Peak flux Power-law 1.42e-01 1.07e-01 5.39e-02 3.88e-02 3.21e-01 3.42e-01 ph/cm2/s
Error 1.43e-02 7.10e-03 5.75e-03 7.98e-03 2.16e-02 2.27e-02 ph/cm2/s
Fluence Cutoff-PL 2.54e-07 4.21e-07 3.63e-07 1.63e-07 1.15e-06 1.20e-06 erg/cm2
Error 3.15e-08 3.43e-08 5.12e-08 1.38e-07 1.11e-07 1.78e-07 erg/cm2
Peak flux Cutoff-PL 1.28e-01 1.18e-01 5.23e-02 1.19e-02 3.07e-01 3.10e-01 ph/cm2/s
Error 1.65e-02 9.42e-03 6.79e-03 8.41e-03 2.28e-02 2.44e-02 ph/cm2/s
Fluence Band 2.51e-07 4.20e-07 3.61e-07 2.14e-07 1.15e-06 1.25e-06 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 1.990 0.125 - - 2.15e-03 1.73e-04 70.130 57
CPL 1.030 0.599 42.1 8.0 7.61e-03 6.96e-03 60.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.990 0.125 - - 2.15e-03 1.73e-04 70.130 57
CPL 1.030 0.599 42.1 8.0 7.61e-03 6.96e-03 60.700 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
233.8391 -57.2310 0.0090 13.6 -146.9 2.4203 21.1 TRIG_00770656
------------------------------------------
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: 1.99046 ( -0.123348 0.126657 )
Norm@50keV : 2.15025E-03 ( -0.000173627 0.00017163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.13 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.136175e-01
Photon flux (15-150 keV) in 64 sec: 0.321131 ( -0.0215688 0.0215882 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26847e-06 ( -9.70362e-08 9.82822e-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: 1.03030 ( -0.640079 0.558083 )
Epeak [keV] : 42.0880 ( -7.18186 8.78931 )
Norm@50keV : 7.61002E-03 ( -0.00391037 0.0100136 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.70 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 56 degrees of freedom
# Null hypothesis probability = 3.104298e-01
Photon flux (15-150 keV) in 64 sec: 0.307042 ( -0.022806 0.022858 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15027e-06 ( -1.0761e-07 1.1376e-07 ) 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 : -0.993315 ( -0.364524 1.27124 )
beta : -3.75038 ( 8.87747 18.8775 )
Epeak [keV] : 41.9792 ( -6.19816 8.78735 )
Norm@50keV : 7.99382E-03 ( -0.00272751 128.591 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.66 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.791177e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15081e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.3153 (-0.784509 0.852951)
R^2/D10^2 : 0.131091 (-0.0348122 0.0472876)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.13 using 59 PHA bins.
# Reduced chi-squared = 1.599 for 57 degrees of freedom
# Null hypothesis probability = 2.744433e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.836e-07 2.035e-08
25- 50 4.767e-07 3.808e-08
50-150 2.720e-07 4.854e-08
15-150 9.323e-07 7.808e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.8894 (-12.3724 16.7359)
Norm : 1.61282 (-0.175179 0.200794)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.32 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 57 degrees of freedom
# Null hypothesis probability = 3.239720e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.630e-07 2.304e-08
25- 50 4.114e-07 2.922e-08
50-150 5.047e-07 8.928e-08
15-150 1.179e-06 9.184e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.46121 (-1.17705 1.3829)
R1^2/D10^2 : 0.907436 (-0.484105 1.34996)
kT2 [keV] : 16.0285 (-2.68747 4.49588)
R2^2/D10^2 : 1.76048E-02 (-0.0116753 0.0219629)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.94 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Null hypothesis probability = 3.336308e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.583e-07 1.032e-07
25- 50 4.123e-07 1.321e-07
50-150 4.629e-07 2.176e-07
15-150 1.133e-06 3.873e-07
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: 1.99046 ( -0.123348 0.126657 )
Norm@50keV : 2.15025E-03 ( -0.000173627 0.00017163 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.13 using 59 PHA bins.
# Reduced chi-squared = 1.230 for 57 degrees of freedom
# Null hypothesis probability = 1.136175e-01
Photon flux (15-150 keV) in 64 sec: 0.321131 ( -0.0215688 0.0215882 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.26847e-06 ( -9.70362e-08 9.82822e-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: 1.03030 ( -0.640079 0.558083 )
Epeak [keV] : 42.0880 ( -7.18186 8.78931 )
Norm@50keV : 7.61002E-03 ( -0.00391037 0.0100136 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.70 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 56 degrees of freedom
# Null hypothesis probability = 3.104298e-01
Photon flux (15-150 keV) in 64 sec: 0.307042 ( -0.022806 0.022858 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15027e-06 ( -1.0761e-07 1.1376e-07 ) 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 : -0.993315 ( -0.364524 1.27124 )
beta : -3.75038 ( 8.87747 18.8775 )
Epeak [keV] : 41.9792 ( -6.19816 8.78735 )
Norm@50keV : 7.99382E-03 ( -0.00272751 126.781 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.66 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 55 degrees of freedom
# Null hypothesis probability = 2.791177e-01
Photon flux (15-150 keV) in 64 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.15081e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.3153 (-0.784509 0.852951)
R^2/D10^2 : 0.131091 (-0.0348122 0.0472876)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 91.13 using 59 PHA bins.
# Reduced chi-squared = 1.599 for 57 degrees of freedom
# Null hypothesis probability = 2.744433e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.836e-07 2.179e-08
25- 50 4.767e-07 3.731e-08
50-150 2.720e-07 4.733e-08
15-150 9.323e-07 7.776e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.8894 (-12.3724 16.7359)
Norm : 1.61282 (-0.175179 0.200794)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.32 using 59 PHA bins.
# Reduced chi-squared = 1.076 for 57 degrees of freedom
# Null hypothesis probability = 3.239720e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.630e-07 2.653e-08
25- 50 4.114e-07 2.922e-08
50-150 5.047e-07 8.445e-08
15-150 1.179e-06 1.066e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.46121 (-1.17705 1.3829)
R1^2/D10^2 : 0.907436 (-0.484105 1.34996)
kT2 [keV] : 16.0285 (-2.68747 4.49588)
R2^2/D10^2 : 1.76048E-02 (-0.0116753 0.0219629)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.94 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Null hypothesis probability = 3.336308e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.583e-07 9.165e-08
25- 50 4.123e-07 1.181e-07
50-150 4.629e-07 2.268e-07
15-150 1.133e-06 4.191e-07
Plot creation:
Tue Sep 5 16:01:04 EDT 2017