batgrbproduct Analysis for Trigger=649916
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): Thu Jul 23 07:38:26 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger649916/GCN5_download_cron
======================================================================
Trigger: 00649916 Segment: 000
BAT Trigger Time: 459251888 [s; MET]
Trigger Stop: 459251952 [s; MET]
UTC: 2015-07-22T09:57:53.112440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 218.271508942397 Dec: -35.1965701114099 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.92
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.92
Flight Position: [ source = BAT ]
RA: 218.271508942397 Dec: -35.1965701114099 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 218.297307634795 Dec: -35.1959408549076 [deg; J2000]
{ 14h 33m 11.4s , -35d 11' 45.4" }
+/- 2.8358600278728 [arcmin] (estimated 90% radius based on SNR)
+/- 1.26129253676311 [arcmin] (formal 1-sigma fit error)
SNR: 6.8616067005444
Angular difference between Flight and Ground position is 1.265498 arcmin
Partial Coding Fraction: 0.9453125 [ including projection effects ]
Duration
T90: 67 +/- 12.5299640861417
Measured from: -23.9999998807907
to: 43.0000001192093 [s; relative to TRIGTIME]
T50: 38 +/- 17.2046505340853
Measured from: -3.99999988079071
to: 34.0000001192093 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 15
to: 16 [s; relative to TRIGTIME]
Total Fluence
Measured from: -26
to: 48 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.385123 0.388015 0.262982 0.037141
0.051545 0.048640 0.040464 0.033212 [error]
Peak 0.014349 0.020389 0.007075 0.005540
0.006075 0.005698 0.004836 0.003956 [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 1.11e-07 1.70e-07 1.96e-07 4.34e-07 6.06e-07 9.11e-07 erg/cm2
Error 2.37e-08 2.24e-08 4.12e-08 1.94e-07 9.38e-08 2.29e-07 erg/cm2
Peak flux Power-law 1.76e-01 1.36e-01 7.10e-02 5.34e-02 4.08e-01 4.37e-01 ph/cm2/s
Error 8.62e-02 4.56e-02 3.86e-02 6.54e-02 1.37e-01 1.48e-01 ph/cm2/s
Fluence Cutoff-PL 1.10e-07 1.70e-07 1.97e-07 4.41e-07 6.07e-07 8.94e-07 erg/cm2
Error 2.37e-08 2.24e-08 4.12e-08 2.31e-07 9.32e-08 2.70e-07 erg/cm2
Peak flux Cutoff-PL 1.64e-01 1.48e-01 6.95e-02 2.00e-02 3.97e-01 4.02e-01 ph/cm2/s
Error 1.31e-01 6.79e-02 5.66e-02 6.35e-02 1.49e-01 1.68e-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 1.794 0.260 - - 8.89e-04 1.34e-04 41.780 57
CPL 2.079 0.000 32.9 0.0 6.29e-04 0.00e+00 41.090 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.942 0.666 - - 2.79e-03 1.17e-03 41.180 57
CPL 1.197 4.581 44.5 -7.2 7.57e-03 1.28e+02 41.020 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 74.000 -26.000 48.000
T90 67.000 -24.000 43.000
T50 38.000 -4.000 34.000
Peak 1.000 15.000 16.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
218.2973 -35.1959 0.0281 23.3 -24.6 0.7041 6.9 TRIG_00649916
------------------------------------------
Foreground time interval of the image:
-26.000 48.000 (delta_t = 74.000 [sec])
Background time interval of the image:
-239.000 -26.000 (delta_t = 213.000 [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 -26.000 sec. to 48.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.79437 ( -0.25438 0.266238 )
Norm@50keV : 8.88772E-04 ( -0.000135956 0.000131566 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7329 for 57 degrees of freedom
# Null hypothesis probability = 9.348857e-01
Photon flux (15-150 keV) in 74 sec: 0.122205 ( -0.0162527 0.0162957 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.056e-07 ( -9.29803e-08 9.47008e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -26.000 sec. to 48.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.07927 ( )
Epeak [keV] : 32.8864 ( )
Norm@50keV : 6.28878E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.09 using 59 PHA bins.
# Reduced chi-squared = 0.7337 for 56 degrees of freedom
# Null hypothesis probability = 9.323863e-01
Photon flux (15-150 keV) in 74 sec: 0.122443 ( -0.0245725 0.016064 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.06622e-07 ( -9.39844e-08 9.24734e-08 ) ergs/cm2
Band function
Time interval is from -26.000 sec. to 48.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.50298 ( 1.50298 1.50298 )
beta : -1.79434 ( 1.79434 0.254368 )
Epeak [keV] : 12.0146 ( -12.0144 -12.0144 )
Norm@50keV : 2.10542E-03 ( -0.00134191 0.022755 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7596 for 55 degrees of freedom
# Null hypothesis probability = 9.055771e-01
Photon flux (15-150 keV) in 74 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] : 11.9302 (-2.27305 3.00013)
R^2/D10^2 : 2.82626E-02 (-0.0279878 0.0337297)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.44 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.836384e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.293e-08 1.800e-08
25- 50 1.967e-07 3.955e-08
50-150 1.677e-07 5.043e-08
15-150 4.273e-07 8.540e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 123.004 (-53.9668 -121.591)
Norm : 0.505844 (-0.0813559 0.120265)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.11 using 59 PHA bins.
# Reduced chi-squared = 0.7738 for 57 degrees of freedom
# Null hypothesis probability = 8.942123e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.740e-08 1.849e-08
25- 50 1.750e-07 5.247e-08
50-150 3.161e-07 1.784e-07
15-150 5.884e-07 3.085e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.03424 (-1.70166 2.27587)
R1^2/D10^2 : 0.567119 (-0.432701 1.39209)
kT2 [keV] : 24.0435 (-7.10639 16.982)
R2^2/D10^2 : 1.89503E-03 (-0.00155147 0.00439685)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.19 using 59 PHA bins.
# Reduced chi-squared = 0.7672 for 55 degrees of freedom
# Null hypothesis probability = 8.972819e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.193e-07 6.214e-08
25- 50 1.495e-07 6.435e-08
50-150 3.469e-07 2.000e-07
15-150 6.157e-07 2.925e-07
Peak spectrum fit
Power-law model
Time interval is from 15.000 sec. to 16.000 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94207 ( -0.608283 0.722851 )
Norm@50keV : 2.79050E-03 ( -0.00121628 0.00113031 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.18 using 59 PHA bins.
# Reduced chi-squared = 0.7224 for 57 degrees of freedom
# Null hypothesis probability = 9.432508e-01
Photon flux (15-150 keV) in 1 sec: 0.407812 ( -0.136576 0.136673 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.56742e-08 ( -1.00542e-08 1.07128e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 15.000 sec. to 16.000 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19688 ( -7.78452 1.37735 )
Epeak [keV] : 44.4513 ( -30.1224 -44.4753 )
Norm@50keV : 7.57044E-03 ( -0.00752722 256.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.02 using 59 PHA bins.
# Reduced chi-squared = 0.7326 for 56 degrees of freedom
# Null hypothesis probability = 9.333080e-01
Photon flux (15-150 keV) in 1 sec: 0.396607 ( -0.15364 0.143452 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.37444e-08 ( -1.06303e-08 1.22883e-08 ) ergs/cm2
Band function
Time interval is from 15.000 sec. to 16.000 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.11421 ( 1.2753 1.2753 )
beta : -2.45364 ( 2.51456 2.42645 )
Epeak [keV] : 42.1738 ( -42.1599 -42.1599 )
Norm@50keV : 8.68868E-03 ( -0.00869989 988509 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.90 using 59 PHA bins.
# Reduced chi-squared = 0.7437 for 55 degrees of freedom
# Null hypothesis probability = 9.214611e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.39531e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.1530 (-2.98337 4.54038)
R^2/D10^2 : 0.183874 (-0.183876 0.510329)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.66 using 59 PHA bins.
# Reduced chi-squared = 0.7309 for 57 degrees of freedom
# Null hypothesis probability = 9.365106e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.880e-09 2.418e-09
25- 50 9.854e-09 6.130e-09
50-150 5.373e-09 4.016e-09
15-150 1.911e-08 1.203e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 71.0763 (-43.9777 -71.0756)
Norm : 1.99972 (-0.829278 1.63313)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.03 using 59 PHA bins.
# Reduced chi-squared = 0.7198 for 57 degrees of freedom
# Null hypothesis probability = 9.452313e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.139e-09 3.333e-09
25- 50 8.209e-09 5.170e-09
50-150 1.066e-08 9.175e-09
15-150 2.401e-08 1.602e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.23184 (-1.63749 19.6129)
R1^2/D10^2 : 2.04169E+04 ( )
kT2 [keV] : 10.9759 (-3.34564 -10.9681)
R2^2/D10^2 : 0.130113 (-0.130905 0.161678)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.21 using 59 PHA bins.
#Fit statistic : Chi-Squared = 40.11 using 59 PHA bins.
# Reduced chi-squared = 0.7311 for 55 degrees of freedom
# Reduced chi-squared = 0.7294 for 55 degrees of freedom
# Null hypothesis probability = 9.326904e-01
# Null hypothesis probability = 9.341172e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.625e-09 2.240e-09
25- 50 9.102e-09 5.700e-09
50-150 6.341e-09 4.444e-09
15-150 2.007e-08 1.176e-08
Plot creation:
Thu Jul 23 07:41:52 EDT 2015