batgrbproduct Analysis for Trigger=642298
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): Wed Jun 3 12:07:11 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger642298/GCN5_download_cron
======================================================================
Trigger: 00642298 Segment: 000
BAT Trigger Time: 454935096 [s; MET]
Trigger Stop: 454935416 [s; MET]
UTC: 2015-06-02T10:51:22.337100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 296.526613982574 Dec: 36.179433822706 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 11.83
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 11.83
Flight Position: [ source = BAT ]
RA: 296.526613982574 Dec: 36.179433822706 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 296.497880693239 Dec: 36.1877082131706 [deg; J2000]
{ 19h 45m 59.5s , +36d 11' 15.7" }
+/- 2.49386698325678 [arcmin] (estimated 90% radius based on SNR)
+/- 1.10784737742493 [arcmin] (formal 1-sigma fit error)
SNR: 8.24435232991105
Angular difference between Flight and Ground position is 1.477403 arcmin
Partial Coding Fraction: 0.2402344 [ 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 1.145960 1.086735 0.556381 0.181004
0.161287 0.162940 0.138184 0.120140 [error]
Peak 1.145960 1.086735 0.556381 0.181004
0.161287 0.162940 0.138184 0.120140 [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 4.47e-07 5.38e-07 4.68e-07 6.97e-07 1.70e-06 2.15e-06 erg/cm2
Error 1.03e-07 8.56e-08 1.41e-07 4.22e-07 3.14e-07 5.75e-07 erg/cm2
Peak flux Power-law 1.19e-01 7.93e-02 3.45e-02 2.07e-02 2.43e-01 2.53e-01 ph/cm2/s
Error 2.81e-02 1.25e-02 1.00e-02 1.16e-02 3.87e-02 3.97e-02 ph/cm2/s
Fluence Cutoff-PL 4.49e-07 5.38e-07 4.64e-07 6.78e-07 1.69e-06 2.13e-06 erg/cm2
Error 1.04e-07 8.61e-08 -------- 4.96e-07 3.14e-07 6.17e-07 erg/cm2
Peak flux Cutoff-PL 1.21e-01 7.91e-02 3.34e-02 1.92e-02 2.43e-01 2.54e-01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- 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 2.201 0.339 - - 1.47e-03 3.15e-04 72.910 57
CPL 1.977 0.000 6.7 0.0 1.84e-03 0.00e+00 73.510 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.201 0.339 - - 1.47e-03 3.15e-04 72.910 57
CPL 1.977 0.000 6.7 0.0 1.84e-03 0.00e+00 73.510 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 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
296.4979 +36.1877 0.0233 48.9 179.7 3.0706 8.2 TRIG_00642298
------------------------------------------
Foreground time interval of the image:
0.000 123.120 (delta_t = 123.120 [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 123.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20094 ( -0.31805 0.360225 )
Norm@50keV : 1.46647E-03 ( -0.000325221 0.000305231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.91 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.611283e-02
Photon flux (15-150 keV) in 123.1 sec: 0.242899 ( -0.0386401 0.0387412 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69751e-06 ( -3.10937e-07 3.17219e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 123.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97661 ( )
Epeak [keV] : 6.66072 ( )
Norm@50keV : 1.83826E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.51 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 56 degrees of freedom
# Null hypothesis probability = 5.826548e-02
Photon flux (15-150 keV) in 123.1 sec: 0.243499 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69232e-06 ( -3.05128e-07 3.22497e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 123.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.40095 ( 3.40095 3.40095 )
beta : -2.20097 ( -0.360187 0.317979 )
Epeak [keV] : 27.8594 ( -27.8594 -27.8594 )
Norm@50keV : 0.199311 ( -0.0442008 0.0414865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.91 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 55 degrees of freedom
# Null hypothesis probability = 5.334095e-02
Photon flux (15-150 keV) in 123.1 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] : 8.90503 (-1.84183 2.28784)
R^2/D10^2 : 0.163187 (-0.0965005 0.250028)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.91 using 59 PHA bins.
# Reduced chi-squared = 1.577 for 57 degrees of freedom
# Null hypothesis probability = 3.540263e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.084e-07 9.288e-08
25- 50 6.447e-07 1.558e-07
50-150 2.381e-07 1.105e-07
15-150 1.191e-06 3.257e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.3697 (-22.2098 45.5567)
Norm : 1.27124 (-0.34003 0.508503)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.28 using 59 PHA bins.
# Reduced chi-squared = 1.338 for 57 degrees of freedom
# Null hypothesis probability = 4.500633e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.891e-07 8.648e-08
25- 50 5.806e-07 1.227e-07
50-150 6.265e-07 2.778e-07
15-150 1.596e-06 3.744e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.36149 (-2.05723 3.04568)
R1^2/D10^2 : 2.52798 (-2.15432 73.7614)
kT2 [keV] : 19.8033 (-8.52293 33.3928)
R2^2/D10^2 : 5.63357E-03 (-0.00510136 0.0313877)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.85 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 55 degrees of freedom
# Null hypothesis probability = 3.873835e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.765e-07 2.698e-07
25- 50 4.550e-07 2.439e-07
50-150 7.600e-07 4.815e-07
15-150 1.692e-06 8.305e-07
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 123.120 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.20094 ( -0.31805 0.360225 )
Norm@50keV : 1.46647E-03 ( -0.000325221 0.000305231 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.91 using 59 PHA bins.
# Reduced chi-squared = 1.279 for 57 degrees of freedom
# Null hypothesis probability = 7.611283e-02
Photon flux (15-150 keV) in 123.1 sec: 0.242899 ( -0.0386401 0.0387412 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69751e-06 ( -3.10937e-07 3.17219e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 123.120 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97661 ( )
Epeak [keV] : 6.66072 ( )
Norm@50keV : 1.83826E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 73.51 using 59 PHA bins.
# Reduced chi-squared = 1.313 for 56 degrees of freedom
# Null hypothesis probability = 5.826548e-02
Photon flux (15-150 keV) in 123.1 sec: 0.243499 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.69232e-06 ( -3.05128e-07 3.22497e-07 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 123.120 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.40095 ( 3.40095 3.40095 )
beta : -2.20097 ( -0.360187 0.317979 )
Epeak [keV] : 27.8594 ( -27.8594 -27.8594 )
Norm@50keV : 0.199311 ( -0.0442008 0.0414865 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.91 using 59 PHA bins.
# Reduced chi-squared = 1.326 for 55 degrees of freedom
# Null hypothesis probability = 5.334095e-02
Photon flux (15-150 keV) in 123.1 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] : 8.90503 (-1.84183 2.28784)
R^2/D10^2 : 0.163187 (-0.0965005 0.250028)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.91 using 59 PHA bins.
# Reduced chi-squared = 1.577 for 57 degrees of freedom
# Null hypothesis probability = 3.540263e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.084e-07 9.965e-08
25- 50 6.447e-07 1.714e-07
50-150 2.381e-07 1.150e-07
15-150 1.191e-06 3.431e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 56.3697 (-22.2098 45.5567)
Norm : 1.27124 (-0.34003 0.508503)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.28 using 59 PHA bins.
# Reduced chi-squared = 1.338 for 57 degrees of freedom
# Null hypothesis probability = 4.500633e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.891e-07 8.457e-08
25- 50 5.806e-07 1.339e-07
50-150 6.265e-07 2.619e-07
15-150 1.596e-06 3.831e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.36149 (-2.05723 3.04568)
R1^2/D10^2 : 2.52798 (-2.15432 73.7614)
kT2 [keV] : 19.8033 (-8.52293 33.3928)
R2^2/D10^2 : 5.63357E-03 (-0.00510136 0.0304409)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.85 using 59 PHA bins.
# Reduced chi-squared = 1.361 for 55 degrees of freedom
# Null hypothesis probability = 3.873835e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.765e-07 2.623e-07
25- 50 4.550e-07 2.349e-07
50-150 7.600e-07 4.666e-07
15-150 1.692e-06 8.128e-07
Plot creation:
Wed Jun 3 12:09:12 EDT 2015