batgrbproduct Analysis for Trigger=644596
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 Jun 19 05:52:09 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger644596/GCN5_download_cron
======================================================================
Trigger: 00644596 Segment: 000
BAT Trigger Time: 456310360 [s; MET]
Trigger Stop: 456310432 [s; MET]
UTC: 2015-06-18T08:52:26.265780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 305.99840917009 Dec: 33.8635961415285 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 25.57
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 25.57
Flight Position: [ source = BAT ]
RA: 305.99840917009 Dec: 33.8635961415285 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 306.013715850359 Dec: 33.8599300724601 [deg; J2000]
{ 20h 24m 03.3s , +33d 51' 35.7" }
+/- 0.514500730553979 [arcmin] (estimated 90% radius based on SNR)
+/- 0.148393052500449 [arcmin] (formal 1-sigma fit error)
SNR: 78.60028129939
Angular difference between Flight and Ground position is 0.793714 arcmin
Partial Coding Fraction: 1 [ including projection effects ]
Duration
T90: 284.912000000477 +/- 11.7166575566461
Measured from: -210.551999866962
to: 74.3600001335144 [s; relative to TRIGTIME]
T50: 179.856000006199 +/- 10.9989032466381
Measured from: -145.60799986124
to: 34.2480001449585 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -215.268000006676
to: -214.268000006676 [s; relative to TRIGTIME]
Total Fluence
Measured from: -226.167999982834
to: 88.3600000143051 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 7.258877 11.078842 6.998021 0.975013
0.148589 0.155594 0.133349 0.104781 [error]
Peak 0.031815 0.060173 0.113215 0.014253
0.026398 0.026892 0.024920 0.017601 [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 2.59e-06 4.20e-06 5.14e-06 1.24e-05 1.54e-05 2.43e-05 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 4.39e-01 3.56e-01 1.95e-01 1.57e-01 1.06e+00 1.15e+00 ph/cm2/s
Error 2.88e-01 1.71e-01 9.36e-02 1.25e-01 5.13e-01 5.24e-01 ph/cm2/s
Fluence Cutoff-PL 2.12e-06 4.48e-06 5.40e-06 4.15e-06 1.44e-05 1.62e-05 erg/cm2
Error 1.27e-07 1.17e-07 1.59e-07 7.34e-07 3.87e-07 8.19e-07 erg/cm2
Peak flux Cutoff-PL 8.08e-02 3.91e-01 4.17e-01 4.64e-02 9.33e-01 9.36e-01 ph/cm2/s
Error 2.38e-01 3.38e-01 2.13e-01 6.10e-02 4.94e-01 4.98e-01 ph/cm2/s
Fluence Band 2.00e-06 4.57e-06 5.18e-06 7.76e-06 1.45e-05 1.96e-05 erg/cm2
Error 1.61e-07 1.55e-07 2.40e-07 -------- 3.82e-07 -------- erg/cm2
Peak flux Band 3.82e-01 4.17e-01 2.50e-01 1.04e-01 1.12e+00 1.15e+00 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 1.708 0.000 - - 5.32e-03 0.00e+00 134.360 57
CPL 0.744 0.189 66.9 4.3 1.55e-02 3.22e-03 40.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.868 0.605 - - 7.49e-03 3.30e-03 66.970 57
CPL -3.438 0.488 64.6 15.0 1.06e+00 6.27e+01 62.620 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: 136.064000 sec.
T50 in the 50-300 keV band: 28.992000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 314.528 -226.168 88.360
T90 284.912 -210.552 74.360
T50 179.856 -145.608 34.248
Peak 1.000 -215.268 -214.268
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
306.0137 +33.8599 0.0024 0.0 -111.4 19.2607 78.6 TRIG_00644596
------------------------------------------
Foreground time interval of the image:
-145.599 88.360 (delta_t = 233.959 [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
Multiple GTIs in the spectrum
tstart tstop
-226.168000 -219.680000
-219.000000 88.360000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70836 ( )
Norm@50keV : 5.32008E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.36 using 59 PHA bins.
# Reduced chi-squared = 2.3571 for 57 degrees of freedom
# Null hypothesis probability = 3.440462e-08
Photon flux (15-150 keV) in 313.8 sec: 0.708641 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.54471e-05 ( 0 0 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-226.168000 -219.680000
-219.000000 88.360000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.744053 ( -0.192539 0.184658 )
Epeak [keV] : 66.9219 ( -3.76291 4.82924 )
Norm@50keV : 1.55322E-02 ( -0.002822 0.00362154 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.41 using 59 PHA bins.
# Reduced chi-squared = 0.7215 for 56 degrees of freedom
# Null hypothesis probability = 9.421747e-01
Photon flux (15-150 keV) in 313.8 sec: 0.662429 ( -0.018475 0.018563 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.44326e-05 ( -3.86445e-07 3.87606e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-226.168000 -219.680000
-219.000000 88.360000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.289402 ( -0.175635 0.151219 )
beta : -2.20515 ( 9.37167 19.3717 )
Epeak [keV] : 55.5822 ( -3.26642 4.65558 )
Norm@50keV : 2.86803E-02 ( -0.0144952 0.0777565 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.22 using 59 PHA bins.
# Reduced chi-squared = 0.6949 for 55 degrees of freedom
# Null hypothesis probability = 9.585460e-01
Photon flux (15-150 keV) in 313.8 sec: 0.585809 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45195e-05 ( -1.45173e-05 -3.81738e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3533 ( )
R^2/D10^2 : 8.83379E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 289.71 using 59 PHA bins.
# Reduced chi-squared = 5.0827 for 57 degrees of freedom
# Null hypothesis probability = 7.038524e-33
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.203e-06 5.084e-08
25- 50 4.586e-06 1.130e-07
50-150 6.299e-06 2.557e-07
15-150 1.209e-05 2.714e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 133.119 (-12.801 12.3823)
Norm : 2.94827 (-0.0829128 0.0995227)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.99 using 59 PHA bins.
# Reduced chi-squared = 1.140 for 57 degrees of freedom
# Null hypothesis probability = 2.183024e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.397e-06 1.280e-07
25- 50 4.363e-06 1.930e-07
50-150 8.178e-06 1.713e-06
15-150 1.494e-05 1.773e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.17733 (-0.725024 0.741189)
R1^2/D10^2 : 0.413197 (-0.0921173 0.133339)
kT2 [keV] : 23.4251 (-2.04741 2.68858)
R2^2/D10^2 : 1.01381E-02 (-0.00370732 0.0048924)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.18 using 59 PHA bins.
# Reduced chi-squared = 0.6033 for 55 degrees of freedom
# Null hypothesis probability = 9.913019e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.906e-06 1.454e-07
25- 50 4.613e-06 2.291e-07
50-150 7.855e-06 7.484e-07
15-150 1.437e-05 8.708e-07
Peak spectrum fit
Power-law model
Time interval is from -215.268 sec. to -214.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86796 ( -0.600465 0.610342 )
Norm@50keV : 7.49057E-03 ( -0.00329823 0.00329232 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.97 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 57 degrees of freedom
# Null hypothesis probability = 1.721820e-01
Photon flux (15-150 keV) in 1 sec: 1.06056 ( -0.510362 0.515865 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.88633e-08 ( -3.03136e-08 3.03132e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -215.268 sec. to -214.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -3.43828 ( 3.48927 4.46492 )
Epeak [keV] : 64.6182 ( -16.0303 13.8956 )
Norm@50keV : 1.05543 ( -1.11659 124.357 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.62 using 59 PHA bins.
# Reduced chi-squared = 1.118 for 56 degrees of freedom
# Null hypothesis probability = 2.529623e-01
Photon flux (15-150 keV) in 1 sec: 0.932726 ( -0.424502 0.564034 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.0085e-08 ( -3.15949e-08 3.2041e-08 ) ergs/cm2
Band function
Time interval is from -215.268 sec. to -214.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.52297 ( -4.53971 -3.46085 )
beta : -10.0000 ( 10 1.77636e-15 )
Epeak [keV] : 64.7127 ( -14.3534 13.8576 )
Norm@50keV : 1.12537 ( -1.12535 5.15415 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.62 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.240320e-01
Photon flux (15-150 keV) in 1 sec: 1.11677 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.1158e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.2059 (-3.80402 4.48525)
R^2/D10^2 : 0.116002 (-0.116002 0.198683)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.92 using 59 PHA bins.
# Reduced chi-squared = 1.104 for 57 degrees of freedom
# Null hypothesis probability = 2.749410e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.281e-09 4.372e-09
25- 50 2.672e-08 1.663e-08
50-150 4.928e-08 3.459e-08
15-150 8.228e-08 5.136e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 98.6438 ( )
Norm : 5.12916 (-2.57847 3.43054)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.86 using 59 PHA bins.
# Reduced chi-squared = 1.155 for 57 degrees of freedom
# Null hypothesis probability = 1.970808e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.226e-08 8.325e-09
25- 50 2.119e-08 1.453e-08
50-150 3.430e-08 2.854e-08
15-150 6.775e-08 4.774e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.14309 (-2.09896 25.2323)
R1^2/D10^2 : 343.982 (-364.371 6.6665e+08)
kT2 [keV] : 16.7479 (-3.86136 5.02531)
R2^2/D10^2 : 9.72665E-02 (-0.0694712 0.121927)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.56 using 59 PHA bins.
# Reduced chi-squared = 1.119 for 55 degrees of freedom
# Null hypothesis probability = 2.530516e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.128e-08 4.786e-09
25- 50 2.460e-08 1.552e-08
50-150 4.860e-08 3.250e-08
15-150 8.449e-08 5.290e-08
Plot creation:
Fri Jun 19 06:00:56 EDT 2015