batgrbproduct Analysis for Trigger=650408
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 27 19:18:16 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger650408/GCN5_download_cron
======================================================================
Trigger: 00650408 Segment: 000
BAT Trigger Time: 459654000 [s; MET]
Trigger Stop: 459654064 [s; MET]
UTC: 2015-07-27T01:39:45.091400 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.320906396755 Dec: -15.5982117287738 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 21.53
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 21.53
Flight Position: [ source = BAT ]
RA: 245.320906396755 Dec: -15.5982117287738 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.317751996076 Dec: -15.6110938434289 [deg; J2000]
{ 16h 21m 16.3s , -15d 36' 39.9" }
+/- 0.689196098786067 [arcmin] (estimated 90% radius based on SNR)
+/- 0.220115691709784 [arcmin] (formal 1-sigma fit error)
SNR: 51.7675035800935
Angular difference between Flight and Ground position is 0.794132 arcmin
Partial Coding Fraction: 0.796875 [ including projection effects ]
Duration
T90: 526.723999977112 +/- 18.5549081051836
Measured from: -37.0719999074936
to: 489.652000069618 [s; relative to TRIGTIME]
T50: 206.12399995327 +/- 13.875674383087
Measured from: 32.7840000987053
to: 238.908000051975 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -25.5400000214577
to: -24.5400000214577 [s; relative to TRIGTIME]
Total Fluence
Measured from: -54.2760000228882
to: 522.208000004292 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 21.908272 2.112675 0.103185 0.171944
0.152398 0.135527 0.115111 0.102947 [error]
Peak 0.043248 0.012863 0.015731 0.008346
0.006919 0.006281 0.005545 0.005444 [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 7.89e-06 9.02e-07 4.36e-08 2.20e-09 8.84e-06 8.84e-06 erg/cm2
Error 6.19e-07 7.84e-08 1.05e-08 9.25e-10 6.05e-07 6.05e-07 erg/cm2
Peak flux Power-law 5.11e-01 1.46e-01 2.25e-02 3.97e-03 6.82e-01 6.84e-01 ph/cm2/s
Error 1.29e-01 7.30e-02 3.00e-02 1.07e-02 1.66e-01 1.67e-01 ph/cm2/s
Fluence Cutoff-PL 7.40e-06 7.27e-07 1.23e-09 2.19e-15 8.13e-06 8.13e-06 erg/cm2
Error 7.32e-07 9.52e-08 2.72e-09 3.67e-13 7.40e-07 7.40e-07 erg/cm2
Peak flux Cutoff-PL 5.17e-01 1.34e-01 1.83e-02 2.86e-03 6.73e-01 6.78e-01 ph/cm2/s
Error 1.30e-01 7.39e-02 3.02e-02 1.08e-02 1.68e-01 1.69e-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 6.371 0.237 - - 1.09e-04 2.13e-05 81.360 57
CPL 1.000 0.000 50.0 0.0 1.77e-03 0.00e+00 809.950 56
The chi2 of BB fit is 64.69 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 3.695 1.038 - - 1.44e-03 1.32e-03 67.810 57
CPL 1.751 0.000 2.5 0.0 6.66e-02 0.00e+00 68.800 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 576.484 -54.276 522.208
T90 526.724 -37.072 489.652
T50 206.124 32.784 238.908
Peak 1.000 -25.540 -24.540
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.3178 -15.6111 0.0037 26.8 -142.4 22.5895 51.8 TRIG_00650408
------------------------------------------
Foreground time interval of the image:
-12.999 303.086 (delta_t = 316.086 [sec])
421.000 522.208 (delta_t = 101.208 [sec])
Background time interval of the image:
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
-54.276000 303.086400
421.000000 522.208000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.37085 ( -0.237942 0.236267 )
Norm@50keV : 1.09055E-04 ( -1.95967e-05 2.30504e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.36 using 59 PHA bins.
# Reduced chi-squared = 1.427 for 57 degrees of freedom
# Null hypothesis probability = 1.876964e-02
Photon flux (15-150 keV) in 458.6 sec: 0.652980 ( -0.0487409 0.0494627 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.84181e-06 ( -6.00679e-07 6.08769e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-54.276000 303.086400
421.000000 522.208000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.76949E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 809.95 using 59 PHA bins.
# Reduced chi-squared = 14.463 for 56 degrees of freedom
# Null hypothesis probability = 3.276147e-134
Photon flux (15-150 keV) in 458.6 sec: 0.597537 ( -0.06085 0.05929 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.12836e-06 ( -7.50315e-07 7.30321e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-54.276000 303.086400
421.000000 522.208000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.30552 ( 6.09357 8.30552 )
beta : -6.38990 ( -0.223345 0.252011 )
Epeak [keV] : 356.699 ( -356.699 -356.699 )
Norm@50keV : 1.45805E-02 ( -0.00254337 0.00325987 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 81.38 using 59 PHA bins.
# Reduced chi-squared = 1.480 for 55 degrees of freedom
# Null hypothesis probability = 1.193097e-02
Photon flux (15-150 keV) in 458.6 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] : 2.67956 (-0.112993 0.122263)
R^2/D10^2 : 174.035 (-55.5286 79.8373)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.69 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.259546e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.141e-06 7.475e-07
25- 50 6.893e-07 7.177e-08
50-150 4.197e-10 1.802e-10
15-150 7.831e-06 7.085e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.52532 (-0.270326 0.303757)
Norm : 205.823 (-56.1751 76.204)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.87 using 59 PHA bins.
# Reduced chi-squared = 1.120 for 57 degrees of freedom
# Null hypothesis probability = 2.479508e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.547e-06 7.727e-07
25- 50 7.543e-07 8.094e-08
50-150 2.306e-09 9.218e-10
15-150 8.303e-06 7.727e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.66586 (-0.111306 0.121024)
R1^2/D10^2 : 181.199 (-54.3917 82.3048)
kT2 [keV] : 179.480 (-149.057 -179.077)
R2^2/D10^2 : 5.19437E-06 (-3.00743e-06 0.000186475)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.47 using 59 PHA bins.
# Reduced chi-squared = 0.9904 for 55 degrees of freedom
# Null hypothesis probability = 4.947339e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.181e-06 7.636e-07
25- 50 7.024e-07 8.094e-08
50-150 5.488e-07 1.599e-07
15-150 8.432e-06 7.888e-07
Peak spectrum fit
Power-law model
Time interval is from -25.540 sec. to -24.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.69549 ( -0.89828 1.17749 )
Norm@50keV : 1.43593E-03 ( -0.00100479 0.00162713 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.81 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 57 degrees of freedom
# Null hypothesis probability = 1.546811e-01
Photon flux (15-150 keV) in 1 sec: 0.682340 ( -0.165395 0.165971 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.55926e-08 ( -7.92919e-09 9.72436e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -25.540 sec. to -24.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75073 ( )
Epeak [keV] : 2.50014 ( )
Norm@50keV : 6.65677E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.80 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 56 degrees of freedom
# Null hypothesis probability = 1.169922e-01
Photon flux (15-150 keV) in 1 sec: 0.673256 ( -0.158618 0.176418 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.57413e-08 ( -8.1497e-09 9.5563e-09 ) ergs/cm2
Band function
Time interval is from -25.540 sec. to -24.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.98377 ( 2.98377 2.98377 )
beta : -3.69659 ( -1.17764 0.898571 )
Epeak [keV] : 40.4778 ( -40.4778 -40.4778 )
Norm@50keV : 0.194965 ( -0.0789707 0.221148 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.81 using 59 PHA bins.
# Reduced chi-squared = 1.233 for 55 degrees of freedom
# Null hypothesis probability = 1.149864e-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] : 3.66283 (-0.809897 0.967324)
R^2/D10^2 : 27.8570 (-27.857 90.7897)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.89 using 59 PHA bins.
# Reduced chi-squared = 1.209 for 57 degrees of freedom
# Null hypothesis probability = 1.343097e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.627e-08 9.065e-09
25- 50 4.534e-09 2.874e-09
50-150 3.159e-11 3.226e-11
15-150 2.083e-08 1.181e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.59928 (-3.09826 6.28508)
Norm : 31.3676 (-19.6552 67.5376)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.81 using 59 PHA bins.
# Reduced chi-squared = 1.207 for 57 degrees of freedom
# Null hypothesis probability = 1.358490e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.583e-08 7.986e-09
25- 50 5.499e-09 3.579e-09
50-150 2.436e-10 2.588e-10
15-150 2.157e-08 1.244e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.38838 (-0.811145 0.920207)
R1^2/D10^2 : 40.6125 (-29.6816 73.7076)
kT2 [keV] : 31.7387 (-15.9186 -31.7729)
R2^2/D10^2 : 2.76697E-03 (-0.002688 0.0205258)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.02 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 55 degrees of freedom
# Null hypothesis probability = 2.402846e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.598e-08 9.165e-09
25- 50 6.061e-09 3.324e-09
50-150 1.846e-08 1.295e-08
15-150 4.050e-08 2.194e-08
Plot creation:
Mon Jul 27 19:21:15 EDT 2015