batgrbproduct Analysis for Trigger=650977
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): Sun Aug 2 05:14:43 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger650977/GCN5_download_cron
======================================================================
Trigger: 00650977 Segment: 000
BAT Trigger Time: 460161723.584 [s; MET]
Trigger Stop: 460161723.84 [s; MET]
UTC: 2015-08-01T22:41:48.648820 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 82.9589982137698 Dec: -5.38743125075409 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.7
Image Trigger?: NO
Rate S/N Ratio: 13 [ if not an image trigger ]
Image S/N Ratio: 7.7
Flight Position: [ source = BAT ]
RA: 82.9589982137698 Dec: -5.38743125075409 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 82.9611236422524 Dec: -5.37445203540923 [deg; J2000]
{ 05h 31m 50.7s , -05d 22' 28.0" }
+/- 1.42604283956656 [arcmin] (estimated 90% radius based on SNR)
+/- 0.439884871595265 [arcmin] (formal 1-sigma fit error)
SNR: 18.3201485560979
Angular difference between Flight and Ground position is 0.789035 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 426.115999937057 +/- 30.2632755209732
Measured from: -17.9719998836517
to: 408.144000053406 [s; relative to TRIGTIME]
T50: 361.219999969006 +/- 6.6891867884209
Measured from: 6.19600009918213
to: 367.416000068188 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.32400000095367
to: 10.3240000009537 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.1599999666214
to: 433.944000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.806577 1.909110 1.260018 0.269281
0.120257 0.123075 0.105091 0.088158 [error]
Peak 0.093422 0.109874 0.072123 0.012215
0.008300 0.008931 0.007570 0.005542 [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 5.82e-07 8.72e-07 9.77e-07 2.07e-06 3.05e-06 4.50e-06 erg/cm2
Error 6.79e-08 6.22e-08 1.08e-07 4.81e-07 2.47e-07 5.75e-07 erg/cm2
Peak flux Power-law 1.03e+00 8.57e-01 4.86e-01 4.08e-01 2.55e+00 2.78e+00 ph/cm2/s
Error 1.39e-01 7.63e-02 6.27e-02 1.02e-01 2.28e-01 2.46e-01 ph/cm2/s
Fluence Cutoff-PL 5.82e-07 8.72e-07 9.76e-07 2.05e-06 3.05e-06 4.48e-06 erg/cm2
Error 6.92e-08 6.44e-08 8.10e-08 6.30e-07 2.43e-07 7.86e-07 erg/cm2
Peak flux Cutoff-PL 9.68e-01 9.07e-01 4.95e-01 2.23e-01 2.51e+00 2.59e+00 ph/cm2/s
Error 1.59e-01 1.00e-01 6.83e-02 1.80e-01 2.34e-01 2.99e-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 1.836 0.138 - - 7.16e-04 5.70e-05 50.660 57
CPL 1.834 0.536 9998.7 0.0 7.17e-04 0.00e+00 50.670 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.819 0.155 - - 1.84e-02 1.83e-03 63.320 57
CPL 1.331 0.650 61.9 -22.3 3.41e-02 3.40e-02 61.490 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: 399.424000 sec.
T50 in the 50-300 keV band: 362.880000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 464.104 -30.160 433.944
T90 426.116 -17.972 408.144
T50 361.220 6.196 367.416
Peak 1.000 9.324 10.324
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
Foreground time interval of the image:
-30.160 8.917 (delta_t = 39.077 [sec])
Background time interval of the image:
-239.584 -30.160 (delta_t = 209.424 [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 -30.160 sec. to 433.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83576 ( -0.135797 0.139229 )
Norm@50keV : 7.15705E-04 ( -5.73898e-05 5.65694e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.66 using 59 PHA bins.
# Reduced chi-squared = 0.8888 for 57 degrees of freedom
# Null hypothesis probability = 7.102078e-01
Photon flux (15-150 keV) in 464.1 sec: 0.100023 ( -0.00729823 0.00731649 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05485e-06 ( -2.45807e-07 2.47967e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.160 sec. to 433.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83441 ( -0.397684 0.673871 )
Epeak [keV] : 9998.72 ( )
Norm@50keV : 7.16570E-04 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.67 using 59 PHA bins.
# Reduced chi-squared = 0.9047 for 56 degrees of freedom
# Null hypothesis probability = 6.763357e-01
Photon flux (15-150 keV) in 464.1 sec: 0.100074 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.05315e-06 ( -2.40436e-07 2.45657e-07 ) ergs/cm2
Band function
Time interval is from -30.160 sec. to 433.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.49065 ( 1.50542 1.50542 )
beta : -1.83530 ( -0.139352 0.135703 )
Epeak [keV] : 20.9417 ( -18.0921 -18.0921 )
Norm@50keV : 1.56018E-03 ( -0.00071198 0.103373 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 50.66 using 59 PHA bins.
# Reduced chi-squared = 0.9212 for 55 degrees of freedom
# Null hypothesis probability = 6.408666e-01
Photon flux (15-150 keV) in 464.1 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] : 12.0245 ( )
R^2/D10^2 : 2.26149E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 114.26 using 59 PHA bins.
# Reduced chi-squared = 2.0046 for 57 degrees of freedom
# Null hypothesis probability = 1.038995e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.210e-07 4.379e-08
25- 50 1.013e-06 8.655e-08
50-150 8.817e-07 1.564e-07
15-150 2.215e-06 1.947e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.6789 (-22.2962 44.8879)
Norm : 0.435681 (-0.0479062 0.0481581)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 0.9660 for 57 degrees of freedom
# Null hypothesis probability = 5.482031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.285e-07 6.098e-08
25- 50 9.133e-07 7.356e-08
50-150 1.477e-06 4.817e-07
15-150 2.919e-06 5.374e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.48659 (-1.21471 1.41266)
R1^2/D10^2 : 0.310295 (-0.178712 0.571999)
kT2 [keV] : 22.0158 (-4.2162 7.33763)
R2^2/D10^2 : 1.93534E-03 (-0.0012634 0.0015451)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.73 using 59 PHA bins.
# Reduced chi-squared = 0.9950 for 55 degrees of freedom
# Null hypothesis probability = 4.850290e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.812e-07 1.824e-07
25- 50 8.345e-07 1.655e-07
50-150 1.569e-06 5.119e-07
15-150 2.984e-06 7.495e-07
Peak spectrum fit
Power-law model
Time interval is from 9.324 sec. to 10.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81899 ( -0.15236 0.157246 )
Norm@50keV : 1.83636E-02 ( -0.00184064 0.00181397 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.32 using 59 PHA bins.
# Reduced chi-squared = 1.111 for 57 degrees of freedom
# Null hypothesis probability = 2.632508e-01
Photon flux (15-150 keV) in 1 sec: 2.54934 ( -0.227817 0.22797 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.68957e-07 ( -1.70474e-08 1.72151e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.324 sec. to 10.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.33141 ( -0.726521 0.573635 )
Epeak [keV] : 61.8878 ( -17.2122 -61.8891 )
Norm@50keV : 3.40858E-02 ( -0.0165983 0.0513369 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.49 using 59 PHA bins.
# Reduced chi-squared = 1.098 for 56 degrees of freedom
# Null hypothesis probability = 2.859765e-01
Photon flux (15-150 keV) in 1 sec: 2.50719 ( -0.23493 0.23398 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62384e-07 ( -1.915e-08 1.9183e-08 ) ergs/cm2
Band function
Time interval is from 9.324 sec. to 10.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.04600 ( 1.0426 1.0426 )
beta : -2.18976 ( 2.18688 0.436946 )
Epeak [keV] : 50.7100 ( -50.3275 -50.3275 )
Norm@50keV : 5.13288E-02 ( -0.052414 1589.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.82 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 55 degrees of freedom
# Null hypothesis probability = 2.745309e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.62584e-07 ( -1.62577e-07 -1.8383e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.3957 (-1.14735 1.29892)
R^2/D10^2 : 0.745288 (-0.249022 0.366174)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.54 using 59 PHA bins.
# Reduced chi-squared = 1.518 for 57 degrees of freedom
# Null hypothesis probability = 7.032162e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.035e-08 3.705e-09
25- 50 6.016e-08 6.625e-09
50-150 4.531e-08 9.415e-09
15-150 1.258e-07 1.370e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 96.0285 (-25.671 43.7881)
Norm : 11.4170 (-1.38278 1.62775)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.45 using 59 PHA bins.
# Reduced chi-squared = 1.078 for 57 degrees of freedom
# Null hypothesis probability = 3.197774e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.983e-08 3.840e-09
25- 50 5.116e-08 4.980e-09
50-150 8.099e-08 3.006e-08
15-150 1.620e-07 3.415e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.60147 (-2.30106 2.58269)
R1^2/D10^2 : 3.80853 (-2.36567 13.0491)
kT2 [keV] : 21.7653 (-6.90568 26.1147)
R2^2/D10^2 : 4.62273E-02 (-0.0409248 0.170271)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.18 using 59 PHA bins.
# Reduced chi-squared = 1.149 for 55 degrees of freedom
# Null hypothesis probability = 2.099054e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.906e-08 1.303e-08
25- 50 5.186e-08 1.786e-08
50-150 7.978e-08 4.095e-08
15-150 1.607e-07 6.252e-08
Plot creation:
Sun Aug 2 15:47:31 EDT 2015