batgrbproduct Analysis for Trigger=625898
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): Fri Jan 16 07:02:30 EST 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger625898/batgroup_hand_proc
======================================================================
Trigger: 00625898 Segment: 000
BAT Trigger Time: 443005736 [s; MET]
Trigger Stop: 443006056 [s; MET]
UTC: 2015-01-15T09:08:42.946100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 348.364066759657 Dec: 2.67911407641638 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.32
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.32
Flight Position: [ source = BAT ]
RA: 348.364066759657 Dec: 2.67911407641638 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 348.367515821473 Dec: 2.69320350822157 [deg; J2000]
{ 23h 13m 28.2s , +02d 41' 35.5" }
+/- 3.13568315501778 [arcmin] (estimated 90% radius based on SNR)
+/- 1.54441758725103 [arcmin] (formal 1-sigma fit error)
SNR: 5.94391265109322
Angular difference between Flight and Ground position is 0.870273 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
T50: 320 +/-
Measured from: 0
to: 320 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 320 second)
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 320 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.784181 0.426960 -0.033138 -0.003342
0.086714 0.085772 0.074225 0.064164 [error]
Peak 0.784181 0.426960 -0.033138 -0.003342
0.086714 0.085772 0.074225 0.064164 [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 2.14e-07 1.47e-07 6.59e-08 4.11e-08 4.47e-07 4.68e-07 erg/cm2
Error 3.95e-08 4.20e-08 3.87e-08 5.03e-08 1.09e-07 1.31e-07 erg/cm2
Peak flux Power-law 2.24e-02 8.64e-03 1.94e-03 5.24e-04 3.33e-02 3.35e-02 ph/cm2/s
Error 4.19e-03 2.35e-03 1.10e-03 6.12e-04 6.09e-03 6.18e-03 ph/cm2/s
Fluence Cutoff-PL 2.18e-07 1.60e-07 3.38e-08 1.45e-09 4.13e-07 4.13e-07 erg/cm2
Error 4.21e-08 5.28e-08 4.50e-08 1.73e-08 1.00e-07 1.05e-07 erg/cm2
Peak flux Cutoff-PL 2.25e-02 9.54e-03 1.07e-03 2.52e-05 3.31e-02 3.31e-02 ph/cm2/s
Error 4.45e-03 2.93e-03 1.33e-03 2.09e-04 5.91e-03 5.92e-03 ph/cm2/s
Fluence Band 2.16e-07 1.60e-07 3.69e-08 2.08e-09 4.15e-07 4.15e-07 erg/cm2
Error 4.15e-08 -------- -------- -------- 9.84e-08 -------- erg/cm2
Peak flux Band 2.25e-02 9.58e-03 1.15e-03 -------- 3.32e-02 3.30e-02 ph/cm2/s
Error 4.44e-03 2.93e-03 -------- -------- 5.91e-03 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.156 0.495 - - 1.08e-04 4.82e-05 55.360 57
CPL 1.506 0.000 8.5 0.0 1.65e-03 0.00e+00 53.250 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 3.156 0.495 - - 1.08e-04 4.82e-05 55.360 57
CPL 1.506 0.000 8.5 0.0 1.65e-03 0.00e+00 53.250 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 320.000 0.000 320.000
T90 320.000 0.000 320.000
T50 320.000 0.000 320.000
Peak 320.000 0.000 320.000
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
348.3675 2.6932 0.0322 5.1681 110.3519 1.1219281 5.944 TRIG_00625898
Foreground time interval of the image:
0.000 320.000 (delta_t = 320.000 [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 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.15608 ( -0.445356 0.545055 )
Norm@50keV : 1.07809E-04 ( -4.4899e-05 5.1527e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9711 for 57 degrees of freedom
# Null hypothesis probability = 5.370024e-01
Photon flux (15-150 keV) in 320 sec: 3.32895E-02 ( -0.00607008 0.00610325 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47213e-07 ( -1.03795e-07 1.14505e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50556 ( )
Epeak [keV] : 8.52241 ( )
Norm@50keV : 1.65081E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.25 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 56 degrees of freedom
# Null hypothesis probability = 5.796067e-01
Photon flux (15-150 keV) in 320 sec: 3.31365E-02 ( -0.0058833 0.005942 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.13485e-07 ( -9.18048e-08 1.08307e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62335 ( -3.0779 1.62338 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 7.14173 ( -7.13469 14.3499 )
Norm@50keV : 1.32716E-03 ( -0.000847235 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9684 for 55 degrees of freedom
# Null hypothesis probability = 5.412853e-01
Photon flux (15-150 keV) in 320 sec: 3.31598E-02 ( 6.96684 -0.0059051 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14509e-07 ( -4.12269e-07 -9.1344e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.87301 (-0.948179 1.20814)
R^2/D10^2 : 0.319087 (-0.203162 0.591242)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.98 using 59 PHA bins.
# Reduced chi-squared = 0.9821 for 57 degrees of freedom
# Null hypothesis probability = 5.133276e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.238e-07 8.136e-08
25- 50 1.371e-07 5.971e-08
50-150 4.914e-09 3.998e-09
15-150 3.658e-07 1.428e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2398 (-5.28981 7.96674)
Norm : 0.536903 (-0.210511 0.401416)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9344 for 57 degrees of freedom
# Null hypothesis probability = 6.161452e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.183e-07 6.605e-08
25- 50 1.604e-07 6.738e-08
50-150 3.305e-08 2.600e-08
15-150 4.117e-07 1.458e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.33271 (-1.66 1.57492)
R1^2/D10^2 : 1.38754 (-1.13315 60.6149)
kT2 [keV] : 8.56153 (-6.88736 7.56789)
R2^2/D10^2 : 1.47987E-02 (-0.0145219 0.205553)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9528 for 55 degrees of freedom
# Null hypothesis probability = 5.744217e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.207e-07 1.137e-07
25- 50 1.611e-07 9.000e-08
50-150 4.224e-08 2.864e-08
15-150 4.240e-07 2.125e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.15608 ( -0.445356 0.545055 )
Norm@50keV : 1.07809E-04 ( -4.4899e-05 5.1527e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.36 using 59 PHA bins.
# Reduced chi-squared = 0.9711 for 57 degrees of freedom
# Null hypothesis probability = 5.370024e-01
Photon flux (15-150 keV) in 320 sec: 3.32895E-02 ( -0.00607008 0.00610325 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.47213e-07 ( -1.03795e-07 1.14505e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50556 ( )
Epeak [keV] : 8.52241 ( )
Norm@50keV : 1.65081E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.25 using 59 PHA bins.
# Reduced chi-squared = 0.9509 for 56 degrees of freedom
# Null hypothesis probability = 5.796067e-01
Photon flux (15-150 keV) in 320 sec: 3.31365E-02 ( -0.0058833 0.005942 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.13485e-07 ( -9.18048e-08 1.08307e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 320.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.62335 ( -3.0779 1.62338 )
beta : -9.37167 ( 9.37167 19.3716 )
Epeak [keV] : 7.14173 ( -7.13469 14.3499 )
Norm@50keV : 1.32716E-03 ( -0.000847235 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9684 for 55 degrees of freedom
# Null hypothesis probability = 5.412853e-01
Photon flux (15-150 keV) in 320 sec: 3.31598E-02 ( 6.96684 -0.0059051 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.14509e-07 ( -4.12269e-07 -9.1344e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.87301 (-0.948179 1.20814)
R^2/D10^2 : 0.319087 (-0.203162 0.591242)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.98 using 59 PHA bins.
# Reduced chi-squared = 0.9821 for 57 degrees of freedom
# Null hypothesis probability = 5.133276e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.238e-07 9.328e-08
25- 50 1.371e-07 6.464e-08
50-150 4.914e-09 4.240e-09
15-150 3.658e-07 1.378e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2398 (-5.28981 7.96674)
Norm : 0.536903 (-0.210511 0.401416)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9344 for 57 degrees of freedom
# Null hypothesis probability = 6.161452e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.183e-07 6.074e-08
25- 50 1.604e-07 5.979e-08
50-150 3.305e-08 2.659e-08
15-150 4.117e-07 1.199e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.33271 (-1.66 1.57492)
R1^2/D10^2 : 1.38754 (-1.13315 60.6149)
kT2 [keV] : 8.56153 (-6.88736 7.56789)
R2^2/D10^2 : 1.47987E-02 (-0.0145219 0.205553)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.40 using 59 PHA bins.
# Reduced chi-squared = 0.9528 for 55 degrees of freedom
# Null hypothesis probability = 5.744217e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.207e-07 1.127e-07
25- 50 1.611e-07 9.102e-08
50-150 4.224e-08 2.744e-08
15-150 4.240e-07 2.141e-07
Plot creation:
Fri Jan 16 07:20:00 EST 2015