batgrbproduct Analysis for Trigger=649157
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): Mon Jul 20 01:17:07 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger649157/batgroup_hand_proc
======================================================================
Trigger: 00649157 Segment: 000
BAT Trigger Time: 458723217.92 [s; MET]
Trigger Stop: 458723218.944 [s; MET]
UTC: 2015-07-16T07:06:43.060080 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 278.46659588295 Dec: -13.0170497349609 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.13
Image Trigger?: NO
Rate S/N Ratio: 13.490737563232 [ if not an image trigger ]
Image S/N Ratio: 7.13
Flight Position: [ source = BAT ]
RA: 278.46659588295 Dec: -13.0170497349609 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.485802755859 Dec: -12.9723920786732 [deg; J2000]
{ 18h 33m 56.6s , -12d 58' 20.6" }
+/- 1.00680324593333 [arcmin] (estimated 90% radius based on SNR)
+/- 0.332699458272803 [arcmin] (formal 1-sigma fit error)
SNR: 30.123941704981
Angular difference between Flight and Ground position is 2.905238 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 48.12399995327 +/- 14.2515149750185
Measured from: -2.31999999284744
to: 45.8039999604225 [s; relative to TRIGTIME]
T50: 19.4959999322891 +/- 2.57047853598234
Measured from: 4.16799998283386
to: 23.663999915123 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.18000000715256
to: 7.18000000715256 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.19200003147125
to: 61.7919999957085 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.722285 0.985535 0.677848 0.083635
0.051341 0.047081 0.040087 0.034323 [error]
Peak 0.030656 0.050040 0.023103 0.001696
0.006520 0.006213 0.005238 0.004218 [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 2.18e-07 3.78e-07 5.01e-07 1.35e-06 1.46e-06 2.45e-06 erg/cm2
Error 2.17e-08 2.25e-08 3.92e-08 2.29e-07 9.30e-08 2.59e-07 erg/cm2
Peak flux Power-law 3.27e-01 2.83e-01 1.68e-01 1.50e-01 8.43e-01 9.28e-01 ph/cm2/s
Error 8.04e-02 4.77e-02 4.01e-02 6.82e-02 1.42e-01 1.58e-01 ph/cm2/s
Fluence Cutoff-PL 2.03e-07 3.94e-07 5.10e-07 7.18e-07 1.41e-06 1.83e-06 erg/cm2
Error 2.61e-08 2.70e-08 4.21e-08 4.47e-07 1.06e-07 4.57e-07 erg/cm2
Peak flux Cutoff-PL 2.51e-01 3.50e-01 1.67e-01 1.91e-02 7.85e-01 7.87e-01 ph/cm2/s
Error 9.61e-02 6.96e-02 5.44e-02 3.85e-02 1.46e-01 1.49e-01 ph/cm2/s
Fluence Band 2.01e-07 3.92e-07 5.10e-07 7.43e-07 1.41e-06 1.85e-06 erg/cm2
Error 2.56e-08 -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.56e-01 3.46e-01 1.69e-01 2.02e-02 7.91e-01 7.93e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.45e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.595 0.105 - - 2.37e-03 1.39e-04 50.580 57
CPL 1.166 0.431 95.9 288.7 3.90e-03 2.04e-03 47.360 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 1.754 0.279 - - 6.22e-03 1.17e-03 54.030 57
CPL -0.415 1.939 48.3 14.5 9.99e-02 1.06e+00 47.340 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: 29.440000 sec.
T50 in the 50-300 keV band: 12.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 65.984 -4.192 61.792
T90 48.124 -2.320 45.804
T50 19.496 4.168 23.664
Peak 1.000 6.180 7.180
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.4858 -12.9724 0.0064 13.0796 56.1988 1.4772501 30.124 TRIG_00649157
Foreground time interval of the image:
-4.192 13.381 (delta_t = 17.573 [sec])
Background time interval of the image:
-239.920 -4.192 (delta_t = 235.728 [sec])
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 -4.192 sec. to 61.792 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.59533 ( -0.104224 0.105045 )
Norm@50keV : 2.36873E-03 ( -0.00013959 0.000139024 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.58 using 59 PHA bins.
# Reduced chi-squared = 0.8873 for 57 degrees of freedom
# Null hypothesis probability = 7.131845e-01
Photon flux (15-150 keV) in 65.98 sec: 0.303954 ( -0.0178104 0.0178453 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.46247e-06 ( -9.26933e-08 9.3334e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.192 sec. to 61.792 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16605 ( -0.452808 0.40976 )
Epeak [keV] : 95.8587 ( -26.7551 550.679 )
Norm@50keV : 3.90386E-03 ( -0.00144915 0.00262235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.36 using 59 PHA bins.
# Reduced chi-squared = 0.8457 for 56 degrees of freedom
# Null hypothesis probability = 7.877431e-01
Photon flux (15-150 keV) in 65.98 sec: 0.296319 ( -0.019176 0.019184 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40882e-06 ( -1.05852e-07 1.06274e-07 ) ergs/cm2
Band function
Time interval is from -4.192 sec. to 61.792 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.16100 ( -0.415189 0.416515 )
beta : -9.37063 ( 9.37163 19.3716 )
Epeak [keV] : 96.6576 ( -21.7263 44.026 )
Norm@50keV : 3.90258E-03 ( -0.00144971 0.00137516 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.37 using 59 PHA bins.
# Reduced chi-squared = 0.8612 for 55 degrees of freedom
# Null hypothesis probability = 7.580111e-01
Photon flux (15-150 keV) in 65.98 sec: 0.297670 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40793e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.3463 (-1.03207 1.12218)
R^2/D10^2 : 3.87201E-02 (-0.0091398 0.011905)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 105.38 using 59 PHA bins.
# Reduced chi-squared = 1.8488 for 57 degrees of freedom
# Null hypothesis probability = 1.023415e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.108e-07 1.234e-08
25- 50 4.220e-07 2.887e-08
50-150 5.790e-07 6.539e-08
15-150 1.112e-06 7.885e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 177.499 (-46.5082 -176.462)
Norm : 1.23562 (-0.0763453 0.0856518)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.52 using 59 PHA bins.
# Reduced chi-squared = 0.8337 for 57 degrees of freedom
# Null hypothesis probability = 8.102919e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.059e-07 1.676e-08
25- 50 3.905e-07 8.026e-08
50-150 8.228e-07 3.359e-07
15-150 1.419e-06 4.213e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.46276 (-1.25974 1.46679)
R1^2/D10^2 : 0.402614 (-0.198775 0.484316)
kT2 [keV] : 22.8226 (-3.45412 5.57344)
R2^2/D10^2 : 5.91566E-03 (-0.0033143 0.0052624)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8506 for 55 degrees of freedom
# Null hypothesis probability = 7.769903e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.998e-07 6.196e-08
25- 50 3.898e-07 7.779e-08
50-150 8.008e-07 2.047e-07
15-150 1.390e-06 3.259e-07
Peak spectrum fit
Power-law model
Time interval is from 6.180 sec. to 7.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75400 ( -0.271305 0.286035 )
Norm@50keV : 6.22212E-03 ( -0.00117896 0.0011577 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.03 using 59 PHA bins.
# Reduced chi-squared = 0.9479 for 57 degrees of freedom
# Null hypothesis probability = 5.871744e-01
Photon flux (15-150 keV) in 1 sec: 0.842587 ( -0.141781 0.141898 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.73984e-08 ( -1.10182e-08 1.13156e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.180 sec. to 7.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.415481 ( -2.33885 1.5383 )
Epeak [keV] : 48.2622 ( -8.86778 20.1717 )
Norm@50keV : 9.99075E-02 ( -0.100568 2.01083 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8453 for 56 degrees of freedom
# Null hypothesis probability = 7.885390e-01
Photon flux (15-150 keV) in 1 sec: 0.784863 ( -0.145535 0.146889 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.88873e-08 ( -1.04942e-08 1.20858e-08 ) ergs/cm2
Band function
Time interval is from 6.180 sec. to 7.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.419444 ( -1.47582 1.90047 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 48.2396 ( -8.92402 20.1841 )
Norm@50keV : 0.100455 ( -0.100455 2.02367 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.34 using 59 PHA bins.
# Reduced chi-squared = 0.8606 for 55 degrees of freedom
# Null hypothesis probability = 7.591105e-01
Photon flux (15-150 keV) in 1 sec: 0.791150 ( 6.20885 -0.151869 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.92355e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7778 (-1.80892 2.21474)
R^2/D10^2 : 0.233135 (-0.111012 0.20021)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.17 using 59 PHA bins.
# Reduced chi-squared = 0.8450 for 57 degrees of freedom
# Null hypothesis probability = 7.913079e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.828e-09 2.189e-09
25- 50 2.102e-08 4.460e-09
50-150 1.731e-08 6.612e-09
15-150 4.515e-08 1.121e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 96.8351 (-39.3159 -97)
Norm : 3.82521 (-0.778674 0.998848)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.83 using 59 PHA bins.
# Reduced chi-squared = 0.8918 for 57 degrees of freedom
# Null hypothesis probability = 7.043805e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.996e-09 2.497e-09
25- 50 1.717e-08 3.740e-09
50-150 2.732e-08 1.697e-08
15-150 5.449e-08 2.192e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.52599 (-8.52778 -8.52778)
R1^2/D10^2 : 0.412843 (-0.412755 -0.412755)
kT2 [keV] : 16.6474 (-16.6516 -16.6516)
R2^2/D10^2 : 3.68582E-02 (-0.0368052 0.352684)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.30 using 59 PHA bins.
# Reduced chi-squared = 0.8601 for 55 degrees of freedom
# Null hypothesis probability = 7.601026e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.759e-09 6.985e-09
25- 50 2.014e-08 2.173e-08
50-150 2.144e-08 2.435e-08
15-150 4.935e-08 5.195e-08
Plot creation:
Mon Jul 20 01:26:31 EDT 2015