batgrbproduct Analysis for Trigger=657321
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 11:55:28 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger657321/GCN5_download_cron
======================================================================
Trigger: 00657321 Segment: 000
BAT Trigger Time: 465416992 [s; MET]
Trigger Stop: 465417056 [s; MET]
UTC: 2015-10-01T18:29:36.787760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 336.844828924081 Dec: 64.6607919699014 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.4
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 7.4
Flight Position: [ source = BAT ]
RA: 336.844828924081 Dec: 64.6607919699014 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 336.973860477077 Dec: 64.6370700817575 [deg; J2000]
{ 22h 27m 53.7s , +64d 38' 13.5" }
+/- 2.11867418225447 [arcmin] (estimated 90% radius based on SNR)
+/- 1.02266625443962 [arcmin] (formal 1-sigma fit error)
SNR: 10.4066851789364
Angular difference between Flight and Ground position is 3.607449 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 108.992000043392 +/- 16.7568455431902
Measured from: -18.0879998803139
to: 90.9040001630783 [s; relative to TRIGTIME]
T50: 59.472000002861 +/- 18.2858441084807
Measured from: 11.6240001320839
to: 71.0960001349449 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 47.4679999947548
to: 48.4679999947548 [s; relative to TRIGTIME]
Total Fluence
Measured from: -23.3040000200272
to: 97.0479999780655 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.119841 0.924614 0.472507 0.071903
0.114890 0.118561 0.102822 0.090599 [error]
Peak 0.021317 0.024182 0.018187 0.028180
0.010932 0.011765 0.009571 0.008824 [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 3.48e-07 4.39e-07 4.03e-07 6.48e-07 1.41e-06 1.84e-06 erg/cm2
Error 6.18e-08 5.83e-08 1.02e-07 3.21e-07 2.29e-07 4.39e-07 erg/cm2
Peak flux Power-law 1.11e-01 1.58e-01 1.66e-01 3.23e-01 5.36e-01 7.57e-01 ph/cm2/s
Error 1.33e-01 1.32e-01 7.03e-02 1.03e+00 2.78e-01 4.01e-01 ph/cm2/s
Fluence Cutoff-PL 3.50e-07 4.39e-07 4.05e-07 5.89e-07 1.40e-06 1.78e-06 erg/cm2
Error 6.19e-08 6.18e-08 1.02e-07 5.20e-07 2.28e-07 5.22e-07 erg/cm2
Peak flux Cutoff-PL 1.26e-01 1.68e-01 1.65e-01 2.94e-01 5.52e-01 7.45e-01 ph/cm2/s
Error 1.33e-01 1.33e-01 7.10e-02 -------- -------- 4.06e-01 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 2.122 0.268 - - 1.27e-03 2.31e-04 43.410 57
CPL 1.985 0.000 6.0 0.0 1.49e-03 0.00e+00 43.690 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL -2.339 1.198 - - 8.77e-05 2.49e-04 53.890 57
CPL 0.965 1.207 9999.4 0.0 4.76e-03 1.25e-02 54.290 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 120.352 -23.304 97.048
T90 108.992 -18.088 90.904
T50 59.472 11.624 71.096
Peak 1.000 47.468 48.468
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
336.9739 +64.6371 0.0184 33.2 123.0 2.4698 10.4 TRIG_00657321
------------------------------------------
Foreground time interval of the image:
-23.304 -17.480 (delta_t = 5.824 [sec])
-16.000 71.001 (delta_t = 87.001 [sec])
Background time interval of the image:
-239.000 -23.304 (delta_t = 215.696 [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
Multiple GTIs in the spectrum
tstart tstop
-23.304000 -17.480000
-16.000000 97.048000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.12187 ( -0.25615 0.279271 )
Norm@50keV : 1.27398E-03 ( -0.000235391 0.000226592 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.41 using 59 PHA bins.
# Reduced chi-squared = 0.7615 for 57 degrees of freedom
# Null hypothesis probability = 9.078088e-01
Photon flux (15-150 keV) in 118.9 sec: 0.202620 ( -0.0259166 0.0259183 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4105e-06 ( -2.25379e-07 2.32265e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-23.304000 -17.480000
-16.000000 97.048000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98502 ( )
Epeak [keV] : 5.95563 ( )
Norm@50keV : 1.48755E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.69 using 59 PHA bins.
# Reduced chi-squared = 0.7801 for 56 degrees of freedom
# Null hypothesis probability = 8.844308e-01
Photon flux (15-150 keV) in 118.9 sec: 0.202546 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4025e-06 ( -2.28079e-07 2.28015e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-23.304000 -17.480000
-16.000000 97.048000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.94553 ( -4.94553 -4.94553 )
beta : -2.17066 ( -0.365154 0.277456 )
Epeak [keV] : 18.3605 ( -18.3605 4.97222 )
Norm@50keV : 1637.12 ( -209.088 2.44367e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.09 using 59 PHA bins.
# Reduced chi-squared = 0.7834 for 55 degrees of freedom
# Null hypothesis probability = 8.780004e-01
Photon flux (15-150 keV) in 118.9 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] : 8.41473 (-1.45086 1.73954)
R^2/D10^2 : 0.174815 (-0.17414 0.196368)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.24 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 57 degrees of freedom
# Null hypothesis probability = 2.377515e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.756e-07 6.106e-08
25- 50 5.256e-07 1.067e-07
50-150 1.625e-07 6.707e-08
15-150 9.638e-07 1.632e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 55.5985 (-18.9784 35.2586)
Norm : 1.08726 (-0.237262 0.320587)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.40 using 59 PHA bins.
# Reduced chi-squared = 0.8140 for 57 degrees of freedom
# Null hypothesis probability = 8.409803e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.206e-07 5.559e-08
25- 50 4.762e-07 7.824e-08
50-150 5.078e-07 1.845e-07
15-150 1.305e-06 2.749e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.83368 (-1.35296 1.74162)
R1^2/D10^2 : 1.29977 (-0.90503 4.10296)
kT2 [keV] : 20.6870 (-7.25389 19.4055)
R2^2/D10^2 : 4.06099E-03 (-0.0035634 0.0117363)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.68 using 59 PHA bins.
# Reduced chi-squared = 0.7942 for 55 degrees of freedom
# Null hypothesis probability = 8.640970e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.669e-07 1.925e-07
25- 50 3.967e-07 1.656e-07
50-150 6.440e-07 3.860e-07
15-150 1.408e-06 6.875e-07
Peak spectrum fit
Power-law model
Time interval is from 47.468 sec. to 48.468 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.33868 ( -1.55301 0.842329 )
Norm@50keV : 8.76739E-05 ( -8.7596e-05 0.000411235 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.89 using 59 PHA bins.
# Reduced chi-squared = 0.9455 for 57 degrees of freedom
# Null hypothesis probability = 5.924339e-01
Photon flux (15-150 keV) in 1 sec: 0.535711 ( -0.280653 0.276247 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.18638e-08 ( -2.1962e-08 2.19429e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 47.468 sec. to 48.468 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.964552 ( -1.60754 0.80568 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 4.75663E-03 ( -0.00474944 0.020255 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.29 using 59 PHA bins.
# Reduced chi-squared = 0.9695 for 56 degrees of freedom
# Null hypothesis probability = 5.396945e-01
Photon flux (15-150 keV) in 1 sec: 0.552419 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.16173e-08 ( -2.17644e-08 2.16026e-08 ) ergs/cm2
Band function
Time interval is from 47.468 sec. to 48.468 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99305 ( -4.99305 -4.99305 )
beta : -1.00376 ( -0.634682 1.54059 )
Epeak [keV] : 27.6556 ( -27.6556 51.061 )
Norm@50keV : 170.513 ( -70.8806 2.90991e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.12 using 59 PHA bins.
# Reduced chi-squared = 0.9840 for 55 degrees of freedom
# Null hypothesis probability = 5.081616e-01
Photon flux (15-150 keV) in 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] : 47.8728 (-36.5525 -48.4503)
R^2/D10^2 : 1.98483E-03 (-0.00189651 0.141526)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.86 using 59 PHA bins.
# Reduced chi-squared = 0.9976 for 57 degrees of freedom
# Null hypothesis probability = 4.801815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.135e-10 3.333e-10
25- 50 3.674e-09 2.370e-09
50-150 4.299e-08 2.641e-08
15-150 4.718e-08 2.916e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.356 (-199.36 -199.36)
Norm : 2.40918 (-1.07313 1.07752)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.17 using 59 PHA bins.
# Reduced chi-squared = 0.9855 for 57 degrees of freedom
# Null hypothesis probability = 5.061201e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.999e-09 3.972e-09
25- 50 1.154e-08 7.510e-09
50-150 2.531e-08 1.630e-08
15-150 4.285e-08 2.887e-08
Double BB
R1^2/D10^2 : 0.352457 (-0.333602 0.759933)
kT2 [keV] : 199.363 (-199.363 -199.363)
R2^2/D10^2 : 1.33698E-04 (-7.22303e-05 0.00434421)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.33 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.02 using 59 PHA bins.
#Fit statistic : Chi-Squared = 52.01 using 59 PHA bins.
# Reduced chi-squared = 0.9514 for 55 degrees of freedom
# Reduced chi-squared = 0.9459 for 55 degrees of freedom
# Reduced chi-squared = 0.9456 for 55 degrees of freedom
# Null hypothesis probability = 5.774399e-01
# Null hypothesis probability = 5.890414e-01
# Null hypothesis probability = 5.897103e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.563e-09 3.215e-09
25- 50 1.108e-08 8.290e-09
50-150 4.007e-08 2.644e-08
15-150 5.571e-08 2.883e-08
Plot creation:
Fri Oct 2 11:59:53 EDT 2015