batgrbproduct analysis for trigger=736843
batgrbproduct Analysis for Trigger=736843
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 15 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Feb 6 18:09:42 EST 2017
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger736843/GCN5_download_cron
======================================================================
Trigger: 00736843 Segment: 000
BAT Trigger Time: 507991168.52 [s; MET]
Trigger Stop: 507991168.584 [s; MET]
UTC: 2017-02-05T12:39:09.951640 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 262.150840978483 Dec: -0.0526188988923711 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.3
Image Trigger?: NO
Rate S/N Ratio: 10.8627804912002 [ if not an image trigger ]
Image S/N Ratio: 8.3
Flight Position: [ source = BAT ]
RA: 262.150840978483 Dec: -0.0526188988923711 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 262.157397386778 Dec: -0.0584459131925322 [deg; J2000]
{ 17h 28m 37.8s , -00d 03' 30.4" }
+/- 0.888671256534443 [arcmin] (estimated 90% radius based on SNR)
+/- 0.264568952470525 [arcmin] (formal 1-sigma fit error)
SNR: 36.003550605403
Angular difference between Flight and Ground position is 0.526295 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 26.0639999508858 +/- 3.22152074752987
Measured from: -0.11599987745285
to: 25.9480000734329 [s; relative to TRIGTIME]
T50: 17.1039999723434 +/- 0.709289799759181
Measured from: 3.38400012254715
to: 20.4880000948906 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.296000003814697
to: 0.703999996185303 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.42399996519089
to: 46.3960000276566 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.386292 2.743149 1.496317 0.285968
0.062404 0.061747 0.054795 0.053741 [error]
Peak 0.143978 0.210008 0.146371 0.036740
0.010594 0.011224 0.010283 0.009050 [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 7.37e-07 1.09e-06 1.21e-06 2.52e-06 3.80e-06 5.56e-06 erg/cm2
Error 4.24e-08 3.55e-08 5.71e-08 2.63e-07 1.29e-07 3.02e-07 erg/cm2
Peak flux Power-law 1.40e+00 1.42e+00 1.01e+00 1.15e+00 4.29e+00 4.99e+00 ph/cm2/s
Error 1.55e-01 9.46e-02 8.54e-02 2.01e-01 2.72e-01 3.23e-01 ph/cm2/s
Fluence Cutoff-PL 7.09e-07 1.11e-06 1.21e-06 1.78e-06 3.72e-06 4.82e-06 erg/cm2
Error 5.27e-08 4.14e-08 5.89e-08 7.14e-07 1.64e-07 6.48e-07 erg/cm2
Peak flux Cutoff-PL 1.35e+00 1.45e+00 1.03e+00 8.78e-01 4.24e+00 4.71e+00 ph/cm2/s
Error 1.83e-01 1.11e-01 9.13e-02 4.09e-01 2.89e-01 5.19e-01 ph/cm2/s
Fluence Band 6.73e-07 1.12e-06 1.19e-06 2.28e-06 3.71e-06 5.27e-06 erg/cm2
Error 6.15e-08 -------- 6.08e-08 -------- 1.51e-07 -------- 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 1.853 0.065 - - 8.65e-03 2.91e-04 39.200 57
CPL 1.640 0.259 80.2 -29.3 1.11e-02 3.34e-03 37.140 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.489 0.115 - - 3.45e-02 2.25e-03 42.670 57
CPL 1.280 0.375 167.6 0.0 4.42e-02 2.23e-02 42.010 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: 22.272000 sec.
T50 in the 50-300 keV band: 17.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 47.820 -1.424 46.396
T90 26.064 -0.116 25.948
T50 17.104 3.384 20.488
Peak 1.000 -0.296 0.704
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
262.1574 -0.0584 0.0053 16.5 146.7 2.3774 36.0 TRIG_00736843
------------------------------------------
Foreground time interval of the image:
-1.424 9.081 (delta_t = 10.505 [sec])
Background time interval of the image:
-60.520 -1.424 (delta_t = 59.096 [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 -1.424 sec. to 46.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.85331 ( -0.0645488 0.065027 )
Norm@50keV : 8.65119E-03 ( -0.000291497 0.000290298 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.20 using 59 PHA bins.
# Reduced chi-squared = 0.6877 for 57 degrees of freedom
# Null hypothesis probability = 9.654051e-01
Photon flux (15-150 keV) in 47.82 sec: 1.21766 ( -0.0412888 0.0414466 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.80374e-06 ( -1.28765e-07 1.29307e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.424 sec. to 46.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.64015 ( -0.269134 0.248548 )
Epeak [keV] : 80.2192 ( -21.7119 -80.2197 )
Norm@50keV : 1.11253E-02 ( -0.00261037 0.00406329 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 37.14 using 59 PHA bins.
# Reduced chi-squared = 0.6632 for 56 degrees of freedom
# Null hypothesis probability = 9.755377e-01
Photon flux (15-150 keV) in 47.82 sec: 1.19628 ( -0.04787 0.04801 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7171e-06 ( -1.64424e-07 1.64209e-07 ) ergs/cm2
Band function
Time interval is from -1.424 sec. to 46.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.755119 ( -0.814884 0.930141 )
beta : -1.93887 ( 1.94247 0.105715 )
Epeak [keV] : 36.7983 ( -17.3389 51.4497 )
Norm@50keV : 4.36568E-02 ( -0.0309224 793.625 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.68 using 59 PHA bins.
# Reduced chi-squared = 0.6306 for 55 degrees of freedom
# Null hypothesis probability = 9.853735e-01
Photon flux (15-150 keV) in 47.82 sec: 1.17928 ( 5.82072 -0.05113 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.71072e-06 ( -3.71038e-06 -1.5322e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.1714 ( )
R^2/D10^2 : 0.255404 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 231.23 using 59 PHA bins.
# Reduced chi-squared = 4.0567 for 57 degrees of freedom
# Null hypothesis probability = 7.568711e-23
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.831e-07 2.336e-08
25- 50 1.226e-06 4.591e-08
50-150 1.102e-06 8.297e-08
15-150 2.711e-06 9.444e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 97.0546 (-11.8315 14.7228)
Norm : 5.26946 (-0.270525 0.293686)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.23 using 59 PHA bins.
# Reduced chi-squared = 0.7234 for 57 degrees of freedom
# Null hypothesis probability = 9.425043e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.585e-07 4.543e-08
25- 50 1.132e-06 4.949e-08
50-150 1.803e-06 4.390e-07
15-150 3.593e-06 4.725e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.02950 (-0.761661 0.780038)
R1^2/D10^2 : 1.46027 (-0.439115 0.729977)
kT2 [keV] : 25.2052 (-3.60322 5.18386)
R2^2/D10^2 : 1.25467E-02 (-0.00610048 0.0100503)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.78 using 59 PHA bins.
# Reduced chi-squared = 0.7597 for 55 degrees of freedom
# Null hypothesis probability = 9.054423e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.227e-07 6.647e-08
25- 50 1.144e-06 9.325e-08
50-150 1.897e-06 2.862e-07
15-150 3.663e-06 3.637e-07
Peak spectrum fit
Power-law model
Time interval is from -0.296 sec. to 0.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.48925 ( -0.114568 0.115579 )
Norm@50keV : 3.44787E-02 ( -0.00225545 0.00224379 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.67 using 59 PHA bins.
# Reduced chi-squared = 0.7486 for 57 degrees of freedom
# Null hypothesis probability = 9.208633e-01
Photon flux (15-150 keV) in 1 sec: 4.29197 ( -0.271878 0.272101 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.27665e-07 ( -2.38813e-08 2.41056e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.296 sec. to 0.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27963 ( -0.479625 0.270103 )
Epeak [keV] : 167.620 ( -167.623 -167.623 )
Norm@50keV : 4.41993E-02 ( -0.0115909 0.0329106 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.01 using 59 PHA bins.
# Reduced chi-squared = 0.7501 for 56 degrees of freedom
# Null hypothesis probability = 9.173613e-01
Photon flux (15-150 keV) in 1 sec: 4.24427 ( -0.28946 0.28848 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.21175e-07 ( -2.7825e-08 2.7565e-08 ) ergs/cm2
Band function
Time interval is from -0.296 sec. to 0.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.641064 ( 0.854702 0.854702 )
beta : -1.61902 ( -1.31571 0.200297 )
Epeak [keV] : 57.9674 ( -58.0814 525.363 )
Norm@50keV : 0.113126 ( -0.111832 3741.7 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.99 using 59 PHA bins.
# Reduced chi-squared = 0.7453 for 55 degrees of freedom
# Null hypothesis probability = 9.199424e-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] : 14.1140 (-1.1564 1.29439)
R^2/D10^2 : 0.590787 (-0.156216 0.207327)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 93.82 using 59 PHA bins.
# Reduced chi-squared = 1.646 for 57 degrees of freedom
# Null hypothesis probability = 1.535386e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.484e-08 2.870e-09
25- 50 9.313e-08 7.475e-09
50-150 1.227e-07 1.705e-08
15-150 2.406e-07 1.925e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-41.3403 -200)
Norm : 17.4717 (-1.09211 1.09211)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.76 using 59 PHA bins.
# Reduced chi-squared = 0.7502 for 57 degrees of freedom
# Null hypothesis probability = 9.192863e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.360e-08 3.045e-09
25- 50 8.388e-08 7.315e-09
50-150 1.840e-07 4.560e-08
15-150 3.114e-07 6.415e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.27275 (-1.66189 1.69859)
R1^2/D10^2 : 2.69531 (-1.15471 2.68867)
kT2 [keV] : 33.0845 (-9.09845 24.0265)
R2^2/D10^2 : 2.36668E-02 (-0.0186081 0.0488843)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 42.42 using 59 PHA bins.
# Reduced chi-squared = 0.7712 for 55 degrees of freedom
# Null hypothesis probability = 8.926434e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.797e-08 8.055e-09
25- 50 8.772e-08 1.803e-08
50-150 1.990e-07 9.151e-08
15-150 3.247e-07 1.108e-07
Plot creation:
Mon Feb 6 18:37:55 EST 2017