batgrbproduct Analysis for Trigger=645172
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 21 13:05:33 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger645172/GCN5_download_cron
======================================================================
Trigger: 00645172 Segment: 000
BAT Trigger Time: 456498232 [s; MET]
Trigger Stop: 456498296 [s; MET]
UTC: 2015-06-20T13:03:38.256020 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.190682603376 Dec: -15.5898969159742 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.65
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.65
Flight Position: [ source = BAT ]
RA: 245.190682603376 Dec: -15.5898969159742 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.079984970289 Dec: -15.6205638366647 [deg; J2000]
{ 16h 20m 19.2s , -15d 37' 14.0" }
+/- 1.40219417023098 [arcmin] (estimated 90% radius based on SNR)
+/- 0.632631013900129 [arcmin] (formal 1-sigma fit error)
SNR: 18.766895736758
Angular difference between Flight and Ground position is 6.656395 arcmin
Partial Coding Fraction: 0.5546875 [ 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 1.803289 0.077146 -0.038747 -0.002391
0.069207 0.062062 0.053614 0.046110 [error]
Peak 1.803289 0.077146 -0.038747 -0.002391
0.069207 0.062062 0.053614 0.046110 [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 5.55e-07 8.66e-08 6.24e-09 4.81e-10 6.48e-07 6.48e-07 erg/cm2
Error 6.35e-08 2.44e-08 4.10e-09 6.38e-10 7.33e-08 7.33e-08 erg/cm2
Peak flux Power-law 3.05e-01 2.78e-02 1.00e-03 3.74e-05 3.33e-01 3.34e-01 ph/cm2/s
Error 3.56e-02 7.47e-03 6.42e-04 4.83e-05 3.73e-02 3.73e-02 ph/cm2/s
Fluence Cutoff-PL 5.82e-07 4.25e-08 3.77e-12 8.39e-22 6.25e-07 6.25e-07 erg/cm2
Error 6.85e-08 2.59e-08 2.62e-10 0.00e+00 7.11e-08 7.11e-08 erg/cm2
Peak flux Cutoff-PL 3.16e-01 1.49e-02 7.00e-07 7.93e-17 3.31e-01 3.31e-01 ph/cm2/s
Error 3.87e-02 8.43e-03 4.66e-05 0.00e+00 3.90e-02 3.90e-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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 1.000 0.000 50.0 0.0 2.03e-03 0.00e+00 227.300 56
The chi2 of BB fit is 39.80 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 0.000 0.000 - - 0.00e+00 0.00e+00 0.000 0
CPL 1.000 0.000 50.0 0.0 2.03e-03 0.00e+00 227.300 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
245.0800 -15.6206 0.0102 22.6 77.0 2.4327 18.8 TRIG_00645172
------------------------------------------
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.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 64 sec: 0.333491 ( -0.03732 0.0373315 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47955e-07 ( -7.31834e-08 7.336e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.03387E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 227.30 using 59 PHA bins.
# Reduced chi-squared = 4.0589 for 56 degrees of freedom
# Null hypothesis probability = 1.670396e-22
Photon flux (15-150 keV) in 64 sec: 0.330556 ( -0.039326 0.038763 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24823e-07 ( -7.1063e-08 7.11386e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
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] : 2.60554 (-0.237527 0.267116)
R^2/D10^2 : 123.087 (-63.0266 133.031)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.80 using 59 PHA bins.
# Reduced chi-squared = 0.6983 for 57 degrees of freedom
# Null hypothesis probability = 9.594772e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.805e-07 1.556e-07
25- 50 5.029e-08 1.887e-08
50-150 2.363e-11 2.053e-11
15-150 6.308e-07 1.925e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.68230 (-0.639989 0.779145)
Norm : 98.6512 (-44.1492 85.2351)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.35 using 59 PHA bins.
# Reduced chi-squared = 0.7254 for 57 degrees of freedom
# Null hypothesis probability = 9.409501e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.746e-07 1.497e-07
25- 50 6.236e-08 2.089e-08
50-150 2.297e-10 1.983e-10
15-150 6.372e-07 1.279e-07
Double BB
R1^2/D10^2 : 4.71397E+08 ( )
kT2 [keV] : 2.64274 (-0.264031 0.340479)
R2^2/D10^2 : 109.508 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.80 using 59 PHA bins.
#Fit statistic : Chi-Squared = 39.71 using 59 PHA bins.
#Fit statistic : Chi-Squared = 39.66 using 59 PHA bins.
# Reduced chi-squared = 0.7237 for 55 degrees of freedom
# Reduced chi-squared = 0.7220 for 55 degrees of freedom
# Reduced chi-squared = 0.7211 for 55 degrees of freedom
# Null hypothesis probability = 9.386942e-01
# Null hypothesis probability = 9.400646e-01
# Null hypothesis probability = 9.406955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.804e-07 8.048e+02
25- 50 5.036e-08 6.944e+03
50-150 2.376e-11 1.785e+05
15-150 6.307e-07 1.737e+05
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 64.000 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 64 sec: 0.333491 ( -0.03732 0.0373315 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47955e-07 ( -7.31834e-08 7.336e-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: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.03387E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 227.30 using 59 PHA bins.
# Reduced chi-squared = 4.0589 for 56 degrees of freedom
# Null hypothesis probability = 1.670396e-22
Photon flux (15-150 keV) in 64 sec: 0.330556 ( -0.039326 0.038763 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.24823e-07 ( -7.1063e-08 7.11386e-08 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 64.000 sec.
XSPEC12>exit
XSPEC: quit
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
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] : 2.60554 (-0.237527 0.267116)
R^2/D10^2 : 123.087 (-63.0266 133.031)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.80 using 59 PHA bins.
# Reduced chi-squared = 0.6983 for 57 degrees of freedom
# Null hypothesis probability = 9.594772e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.805e-07 1.520e-07
25- 50 5.029e-08 1.859e-08
50-150 2.363e-11 2.037e-11
15-150 6.308e-07 1.959e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.68230 (-0.639989 0.779145)
Norm : 98.6512 (-44.1492 85.2351)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.35 using 59 PHA bins.
# Reduced chi-squared = 0.7254 for 57 degrees of freedom
# Null hypothesis probability = 9.409501e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.746e-07 1.467e-07
25- 50 6.236e-08 2.325e-08
50-150 2.297e-10 2.002e-10
15-150 6.372e-07 1.644e-07
Double BB
R1^2/D10^2 : 4.71397E+08 ( )
kT2 [keV] : 2.64274 (-0.264031 0.340479)
R2^2/D10^2 : 109.508 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.80 using 59 PHA bins.
#Fit statistic : Chi-Squared = 39.71 using 59 PHA bins.
#Fit statistic : Chi-Squared = 39.66 using 59 PHA bins.
# Reduced chi-squared = 0.7237 for 55 degrees of freedom
# Reduced chi-squared = 0.7220 for 55 degrees of freedom
# Reduced chi-squared = 0.7211 for 55 degrees of freedom
# Null hypothesis probability = 9.386942e-01
# Null hypothesis probability = 9.400646e-01
# Null hypothesis probability = 9.406955e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.804e-07 8.970e+02
25- 50 5.036e-08 7.302e+03
50-150 2.376e-11 1.693e+05
15-150 6.307e-07 1.757e+05
Plot creation:
Sun Jun 21 13:08:43 EDT 2015