batgrbproduct Analysis for Trigger=657286
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 Oct 2 18:50:33 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger657286/GCN5_download_cron
======================================================================
Trigger: 00657286 Segment: 000
BAT Trigger Time: 465404678.144 [s; MET]
Trigger Stop: 465404679.168 [s; MET]
UTC: 2015-10-01T15:04:22.932420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 233.730768614118 Dec: 10.971220915415 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11
Image Trigger?: NO
Rate S/N Ratio: 22.1359436211787 [ if not an image trigger ]
Image S/N Ratio: 11
Flight Position: [ source = BAT ]
RA: 233.730768614118 Dec: 10.971220915415 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 233.721606760092 Dec: 10.9836522490719 [deg; J2000]
{ 15h 34m 53.2s , +10d 59' 01.1" }
+/- 1.14171946970829 [arcmin] (estimated 90% radius based on SNR)
+/- 0.433622780247347 [arcmin] (formal 1-sigma fit error)
SNR: 25.170431195025
Angular difference between Flight and Ground position is 0.920631 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 8.93599998950958 +/- 1.06650831336257
Measured from: -5.47559988498688
to: 3.46040010452271 [s; relative to TRIGTIME]
T50: 4.53199994564056 +/- 0.535835827566052
Measured from: -2.73959988355637
to: 1.7924000620842 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.0436000227928162
to: 0.956399977207184 [s; relative to TRIGTIME]
Total Fluence
Measured from: -6.27959996461868
to: 4.52840000391006 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.222798 0.369035 0.317616 0.113432
0.021103 0.021395 0.019099 0.015771 [error]
Peak 0.033085 0.063976 0.056525 0.013447
0.006647 0.007082 0.006298 0.004908 [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 6.17e-08 1.39e-07 2.47e-07 1.04e-06 6.74e-07 1.48e-06 erg/cm2
Error 7.78e-09 1.02e-08 1.81e-08 1.77e-07 4.61e-08 1.87e-07 erg/cm2
Peak flux Power-law 3.41e-01 4.14e-01 3.64e-01 5.50e-01 1.31e+00 1.67e+00 ph/cm2/s
Error 7.51e-02 5.61e-02 4.85e-02 1.54e-01 1.56e-01 2.06e-01 ph/cm2/s
Fluence Cutoff-PL 6.15e-08 1.39e-07 2.47e-07 1.01e-06 6.74e-07 1.46e-06 erg/cm2
Error 8.08e-09 1.01e-08 1.84e-08 2.55e-07 4.60e-08 2.94e-07 erg/cm2
Peak flux Cutoff-PL 2.96e-01 4.32e-01 3.88e-01 3.00e-01 1.28e+00 1.42e+00 ph/cm2/s
Error 9.23e-02 6.41e-02 5.88e-02 2.41e-01 1.62e-01 3.01e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.09e-01 4.28e-01 3.84e-01 3.47e-01 1.29e+00 1.48e+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 1.168 0.115 - - 6.09e-03 3.76e-04 46.120 57
CPL 1.166 0.115 9999.4 0.0 6.12e-03 1.45e-03 46.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.186 0.198 - - 1.12e-02 1.30e-03 54.490 57
CPL 0.565 0.836 125.3 -39.0 2.19e-02 2.41e-02 52.750 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: 8.128000 sec.
T50 in the 50-300 keV band: 4.096000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 10.808 -6.280 4.528
T90 8.936 -5.476 3.460
T50 4.532 -2.740 1.792
Peak 1.000 -0.044 0.956
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
233.7216 +10.9837 0.0076 2.4 178.2 1.0387 25.2 TRIG_00657286
------------------------------------------
Foreground time interval of the image:
-6.280 4.528 (delta_t = 10.808 [sec])
Background time interval of the image:
-239.144 -6.280 (delta_t = 232.864 [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 -6.280 sec. to 4.528 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16823 ( -0.115267 0.113868 )
Norm@50keV : 6.09012E-03 ( -0.000376301 0.000376111 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.12 using 59 PHA bins.
# Reduced chi-squared = 0.8092 for 57 degrees of freedom
# Null hypothesis probability = 8.480695e-01
Photon flux (15-150 keV) in 10.81 sec: 0.711824 ( -0.0457413 0.0458649 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.74059e-07 ( -4.60251e-08 4.62514e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -6.280 sec. to 4.528 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.16605 ( -0.117802 0.112875 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 6.11678E-03 ( -0.00037723 0.00252478 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.14 using 59 PHA bins.
# Reduced chi-squared = 0.8239 for 56 degrees of freedom
# Null hypothesis probability = 8.234846e-01
Photon flux (15-150 keV) in 10.81 sec: 0.712083 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.7434e-07 ( -4.63414e-08 4.56604e-08 ) ergs/cm2
Band function
Time interval is from -6.280 sec. to 4.528 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.748872 ( 0.719682 0.719682 )
beta : -1.20376 ( 1.20657 0.145952 )
Epeak [keV] : 104.202 ( -100.135 362.449 )
Norm@50keV : 1.10297E-02 ( -0.00544781 272440 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 45.81 using 59 PHA bins.
# Reduced chi-squared = 0.8329 for 55 degrees of freedom
# Null hypothesis probability = 8.067524e-01
Photon flux (15-150 keV) in 10.81 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] : 19.6143 (-1.7979 2.05931)
R^2/D10^2 : 3.40960E-02 (-0.00939082 0.0126605)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 110.25 using 59 PHA bins.
# Reduced chi-squared = 1.9342 for 57 degrees of freedom
# Null hypothesis probability = 2.980137e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.754e-08 3.654e-09
25- 50 1.354e-07 1.362e-08
50-150 3.851e-07 4.378e-08
15-150 5.481e-07 4.508e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-11.8082 -200)
Norm : 2.95797 (-0.186765 0.186765)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.13 using 59 PHA bins.
# Reduced chi-squared = 1.388 for 57 degrees of freedom
# Null hypothesis probability = 2.785978e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.960e-08 5.610e-09
25- 50 1.531e-07 1.238e-08
50-150 3.358e-07 8.194e-08
15-150 5.686e-07 9.156e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.84452 (-1.5376 1.78581)
R1^2/D10^2 : 0.309112 (-0.132274 0.256265)
kT2 [keV] : 42.1219 (-10.1287 24.678)
R2^2/D10^2 : 2.65406E-03 (-0.00182618 0.00338698)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.79 using 59 PHA bins.
# Reduced chi-squared = 0.7961 for 55 degrees of freedom
# Null hypothesis probability = 8.615406e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.675e-08 1.334e-08
25- 50 1.481e-07 2.939e-08
50-150 4.831e-07 2.008e-07
15-150 6.879e-07 2.453e-07
Peak spectrum fit
Power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18606 ( -0.199474 0.196697 )
Norm@50keV : 1.11901E-02 ( -0.00129593 0.00129593 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.49 using 59 PHA bins.
# Reduced chi-squared = 0.9559 for 57 degrees of freedom
# Null hypothesis probability = 5.699254e-01
Photon flux (15-150 keV) in 1 sec: 1.31097 ( -0.155723 0.156035 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13979e-07 ( -1.45953e-08 1.47205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.565187 ( -0.967895 0.703927 )
Epeak [keV] : 125.316 ( -47.2726 -125.316 )
Norm@50keV : 2.19266E-02 ( -0.00987416 0.0383581 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.75 using 59 PHA bins.
# Reduced chi-squared = 0.9419 for 56 degrees of freedom
# Null hypothesis probability = 5.986983e-01
Photon flux (15-150 keV) in 1 sec: 1.27780 ( -0.16239 0.16179 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.09936e-07 ( -1.5898e-08 1.5789e-08 ) ergs/cm2
Band function
Time interval is from -0.044 sec. to 0.956 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.565276 ( -0.480194 0.895277 )
beta : -10.0000 ( 10 1.24345e-14 )
Epeak [keV] : 125.310 ( -34.9725 378.497 )
Norm@50keV : 2.19242E-02 ( -0.0114254 0.0383894 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.75 using 59 PHA bins.
# Reduced chi-squared = 0.9591 for 55 degrees of freedom
# Null hypothesis probability = 5.611063e-01
Photon flux (15-150 keV) in 1 sec: 1.29410 ( ) 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] : 18.6372 (-2.6081 3.1886)
R^2/D10^2 : 7.72456E-02 (-0.0313995 0.0503339)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.98 using 59 PHA bins.
# Reduced chi-squared = 1.087 for 57 degrees of freedom
# Null hypothesis probability = 3.031626e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.310e-09 1.250e-09
25- 50 2.519e-08 4.090e-09
50-150 6.405e-08 1.529e-08
15-150 9.455e-08 1.838e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-33.6773 -200)
Norm : 5.40993 (-0.639819 0.639819)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.71 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 57 degrees of freedom
# Null hypothesis probability = 2.810013e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.347e-08 7.470e-09
25- 50 2.592e-08 1.429e-08
50-150 5.684e-08 3.121e-08
15-150 9.624e-08 5.350e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.76072 (-5.45661 5.19788)
R1^2/D10^2 : 0.356879 (-0.231555 3.96373)
kT2 [keV] : 31.8396 (-27.7764 -32.0423)
R2^2/D10^2 : 9.96636E-03 (-0.00975487 0.0729308)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.54 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.92 using 59 PHA bins.
# Reduced chi-squared = 1.010 for 55 degrees of freedom
# Reduced chi-squared = 0.9622 for 55 degrees of freedom
# Null hypothesis probability = 4.541657e-01
# Null hypothesis probability = 5.544863e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.631e-09 2.855e-09
25- 50 2.299e-08 5.280e-09
50-150 6.827e-08 1.638e-08
15-150 9.988e-08 1.743e-08
Plot creation:
Fri Oct 2 18:54:49 EDT 2015