batgrbproduct Analysis for Trigger=651882
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): Wed Aug 12 00:57:02 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger651882/GCN5_download_cron
======================================================================
Trigger: 00651882 Segment: 000
BAT Trigger Time: 460958784 [s; MET]
Trigger Stop: 460958848 [s; MET]
UTC: 2015-08-11T04:06:09.022920 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 291.370844486993 Dec: -15.4381283909325 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.67
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.67
Flight Position: [ source = BAT ]
RA: 291.370844486993 Dec: -15.4381283909325 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 291.346018350367 Dec: -15.4341597330967 [deg; J2000]
{ 19h 25m 23.0s , -15d 26' 03.0" }
+/- 1.94730594571653 [arcmin] (estimated 90% radius based on SNR)
+/- 0.91704308024037 [arcmin] (formal 1-sigma fit error)
SNR: 11.7392666069645
Angular difference between Flight and Ground position is 1.455447 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 34.0160000324249 +/- 6.2692442926943
Measured from: 2.72800010442734
to: 36.7440001368523 [s; relative to TRIGTIME]
T50: 16.960000038147 +/- 4.3112504356342
Measured from: 6.90400010347366
to: 23.8640001416206 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.58799999952316
to: 7.58799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 1.5120000243187
to: 40.3600000143051 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.406667 0.353753 0.175320 0.043353
0.044412 0.043499 0.035997 0.030230 [error]
Peak 0.027429 0.022248 0.016818 -0.000057
0.007463 0.007319 0.005762 0.004865 [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 1.21e-07 1.51e-07 1.38e-07 2.18e-07 4.84e-07 6.28e-07 erg/cm2
Error 2.20e-08 2.06e-08 3.46e-08 1.07e-07 7.89e-08 1.48e-07 erg/cm2
Peak flux Power-law 2.46e-01 1.81e-01 8.85e-02 6.14e-02 5.45e-01 5.77e-01 ph/cm2/s
Error 1.07e-01 5.78e-02 4.57e-02 7.06e-02 1.74e-01 1.85e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-07 1.55e-07 1.36e-07 1.51e-07 4.75e-07 5.62e-07 erg/cm2
Error 2.34e-08 2.56e-08 3.75e-08 1.69e-07 8.79e-08 1.90e-07 erg/cm2
Peak flux Cutoff-PL 2.38e-01 1.95e-01 8.69e-02 2.80e-02 5.38e-01 5.47e-01 ph/cm2/s
Error 1.13e-01 7.53e-02 6.90e-02 6.80e-02 1.74e-01 1.91e-01 ph/cm2/s
Fluence Band 1.19e-07 1.54e-07 1.34e-07 2.01e-07 4.79e-07 6.10e-07 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.43e-01 1.86e-01 8.88e-02 4.65e-02 5.43e-01 5.64e-01 ph/cm2/s
Error -------- -------- -------- -------- 1.74e-01 1.94e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.137 0.267 - - 1.34e-03 2.44e-04 57.020 57
CPL 1.950 0.589 11.0 -0.5 1.72e-03 0.00e+00 56.910 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.033 0.595 - - 3.58e-03 1.44e-03 53.750 57
CPL 1.489 2.155 37.7 0.0 7.59e-03 0.00e+00 53.520 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 38.848 1.512 40.360
T90 34.016 2.728 36.744
T50 16.960 6.904 23.864
Peak 1.000 6.588 7.588
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
291.3460 -15.4342 0.0163 26.5 148.3 1.0326 11.7 TRIG_00651882
------------------------------------------
Foreground time interval of the image:
1.512 40.360 (delta_t = 38.848 [sec])
Background time interval of the image:
-239.000 1.512 (delta_t = 240.512 [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 1.512 sec. to 40.360 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.13661 ( -0.255518 0.277959 )
Norm@50keV : 1.33707E-03 ( -0.000247697 0.000239637 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.02 using 59 PHA bins.
# Reduced chi-squared = 1.000 for 57 degrees of freedom
# Null hypothesis probability = 4.742756e-01
Photon flux (15-150 keV) in 38.85 sec: 0.214238 ( -0.0283078 0.0283132 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.84479e-07 ( -7.77245e-08 8.00193e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.512 sec. to 40.360 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94958 ( -1.09359 0.0850657 )
Epeak [keV] : 10.9655 ( -9.73533 -10.7274 )
Norm@50keV : 1.72436E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.91 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 56 degrees of freedom
# Null hypothesis probability = 4.410860e-01
Photon flux (15-150 keV) in 38.85 sec: 0.212812 ( -0.0291 0.029069 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.75287e-07 ( -8.84113e-08 8.73426e-08 ) ergs/cm2
Band function
Time interval is from 1.512 sec. to 40.360 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.95138 ( -4.1554 0.116495 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 10.6685 ( -6.46679 -10.6685 )
Norm@50keV : 1.71978E-03 ( -0.000226761 0.00184343 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.91 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 55 degrees of freedom
# Null hypothesis probability = 4.039205e-01
Photon flux (15-150 keV) in 38.85 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.78683e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.78411 (-1.44197 1.72673)
R^2/D10^2 : 0.158730 (-0.0800676 0.164748)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.37 using 59 PHA bins.
# Reduced chi-squared = 1.270 for 57 degrees of freedom
# Null hypothesis probability = 8.243727e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.144e-08 2.181e-08
25- 50 1.870e-07 3.854e-08
50-150 6.620e-08 2.553e-08
15-150 3.447e-07 6.603e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 53.7600 (-17.4397 31.963)
Norm : 1.16277 (-0.248892 0.349954)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.94 using 59 PHA bins.
# Reduced chi-squared = 1.016 for 57 degrees of freedom
# Null hypothesis probability = 4.404335e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.122e-07 1.933e-08
25- 50 1.652e-07 2.787e-08
50-150 1.715e-07 6.346e-08
15-150 4.489e-07 8.199e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.90649 (-1.56445 1.90049)
R1^2/D10^2 : 1.20115 (-0.854866 5.08968)
kT2 [keV] : 18.0275 (-5.81705 13.5242)
R2^2/D10^2 : 6.96805E-03 (-0.00612198 0.0278772)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.80 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 55 degrees of freedom
# Null hypothesis probability = 4.076473e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.228e-07 6.667e-08
25- 50 1.471e-07 7.554e-08
50-150 1.948e-07 1.121e-07
15-150 4.646e-07 2.440e-07
Peak spectrum fit
Power-law model
Time interval is from 6.588 sec. to 7.588 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.03277 ( -0.550894 0.639168 )
Norm@50keV : 3.57624E-03 ( -0.00147893 0.00140351 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.75 using 59 PHA bins.
# Reduced chi-squared = 0.9430 for 57 degrees of freedom
# Null hypothesis probability = 5.976747e-01
Photon flux (15-150 keV) in 1 sec: 0.544682 ( -0.173646 0.173723 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.30444e-08 ( -1.21586e-08 1.28209e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.588 sec. to 7.588 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48890 ( -3.6747 0.635547 )
Epeak [keV] : 37.6591 ( )
Norm@50keV : 7.58834E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.52 using 59 PHA bins.
# Reduced chi-squared = 0.9557 for 56 degrees of freedom
# Null hypothesis probability = 5.693352e-01
Photon flux (15-150 keV) in 1 sec: 0.538358 ( -0.174228 0.174028 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.13364e-08 ( -1.2817e-08 1.39593e-08 ) ergs/cm2
Band function
Time interval is from 6.588 sec. to 7.588 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.91081 ( -7.10743 -4.91081 )
beta : -2.39197 ( -1.75224 0.742278 )
Epeak [keV] : 23.9267 ( -23.9267 8.53942 )
Norm@50keV : 756.531 ( -234.634 7.19965e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.33 using 59 PHA bins.
# Reduced chi-squared = 0.9515 for 55 degrees of freedom
# Null hypothesis probability = 5.771695e-01
Photon flux (15-150 keV) in 1 sec: 0.543433 0.537728 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.15149e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 8.37296 (-2.9035 5.12886)
R^2/D10^2 : 0.506970 (-0.502184 2.25743)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.91 using 59 PHA bins.
# Reduced chi-squared = 0.9808 for 57 degrees of freedom
# Null hypothesis probability = 5.160858e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.634e-09 4.109e-09
25- 50 1.255e-08 8.245e-09
50-150 3.819e-09 2.956e-09
15-150 2.300e-08 1.438e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 60.4263 (-35.3279 -60.4263)
Norm : 2.87449 (-1.22059 2.35428)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.53 using 59 PHA bins.
# Reduced chi-squared = 0.9391 for 57 degrees of freedom
# Null hypothesis probability = 6.061995e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.233e-09 3.704e-09
25- 50 1.103e-08 6.695e-09
50-150 1.263e-08 9.970e-09
15-150 3.089e-08 2.073e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.60119 (-2.50388 3.81025)
R1^2/D10^2 : 1.94810 (-1.67501 17.6289)
kT2 [keV] : 21.8992 (-11.7953 -21.8924)
R2^2/D10^2 : 8.47518E-03 (-0.00836911 0.276096)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.43 using 59 PHA bins.
# Reduced chi-squared = 0.9532 for 55 degrees of freedom
# Null hypothesis probability = 5.735973e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.061e-09 4.988e-09
25- 50 1.023e-08 5.805e-09
50-150 1.467e-08 1.007e-08
15-150 3.295e-08 1.737e-08
Plot creation:
Wed Aug 12 01:01:47 EDT 2015