batgrbproduct analysis for trigger=957271
batgrbproduct Analysis for Trigger=957271
Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Wed Feb 19 19:38:43 EST 2020
Host Name: bat1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger957271
======================================================================
Trigger: 00957271 Segment: 000
BAT Trigger Time: 603790633.6 [s; MET]
Trigger Stop: 603790633.856 [s; MET]
UTC: 2020-02-19T07:36:49.139100 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 342.644409036627 Dec: -59.1083992201985 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 13.23
Image Trigger?: NO
Rate S/N Ratio: 97.4320275884681 [ if not an image trigger ]
Image S/N Ratio: 13.23
Flight Position: [ source = BAT ]
RA: 342.644409036627 Dec: -59.1083992201985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 342.594694865084 Dec: -59.1012457317369 [deg; J2000]
{ 22h 50m 22.7s , -59d 06' 04.5" }
+/- 2.3689526956136 [arcmin] (estimated 90% radius based on SNR)
+/- 1.07910232751214 [arcmin] (formal 1-sigma fit error)
SNR: 8.8723328216173
Angular difference between Flight and Ground position is 1.590605 arcmin
Partial Coding Fraction: 0.9921875 [ including projection effects ]
Duration
T90: 81.328 +/- 9.97851458874499
Measured from: -0.016
to: 81.312 [s; relative to TRIGTIME]
T50: 58.768 +/- 13.4595119004626
Measured from: 0.416
to: 59.184 [s; relative to TRIGTIME]
======================================================================
=== 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 9.65e-08 1.80e-07 2.59e-07 7.93e-07 7.37e-07 1.33e-06 erg/cm2
Error 2.26e-08 2.48e-08 4.71e-08 3.21e-07 1.12e-07 3.55e-07 erg/cm2
Peak flux Power-law 4.20e-01 6.68e-01 8.03e-01 1.89e+00 2.43e+00 3.78e+00 ph/cm2/s
Error 7.12e-02 6.77e-02 6.15e-02 3.34e-01 1.81e-01 3.46e-01 ph/cm2/s
Fluence Cutoff-PL 9.65e-08 1.76e-07 2.56e-07 8.78e-07 7.42e-07 1.30e-06 erg/cm2
Error -------- 3.78e-08 -------- 3.41e-07 1.55e-07 4.33e-07 erg/cm2
Peak flux Cutoff-PL 4.19e-01 6.67e-01 7.97e-01 2.10e+00 2.44e+00 3.96e+00 ph/cm2/s
Error -------- 7.64e-02 7.32e-02 -------- 2.07e-01 5.07e-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 1.472 0.250 - - 8.90e-04 1.21e-04 61.740 57
CPL 1.472 0.327 9999.2 0.0 8.92e-04 8.46e-04 61.750 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.735 0.137 - - 2.11e-02 1.62e-03 54.530 57
CPL 0.732 0.165 9999.3 0.0 2.13e-02 5.13e-03 54.560 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: 0.512000 sec.
T50 in the 50-300 keV band: 0.256000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 86.928 -0.223 86.704
T90 81.328 -0.016 81.312
T50 58.768 0.416 59.184
Peak 1.000 -0.268 0.732
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
342.5947 -59.1012 0.0218 17.4796 -0.9238 0.5972333 8.872 TRIG_00957271
Foreground time interval of the image:
-15.600 15.501 (delta_t = 31.101 [sec])
Background time interval of the image:
-116.099 -15.600 (delta_t = 100.499 [sec])
Lightcurves
Notes:
- 1) The mask-weighted light curves are using the flight position.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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)
Spectral Evolution
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -0.224 sec. to 86.704 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47227 ( -0.247854 0.251177 )
Norm@50keV : 8.89532E-04 ( -0.000121251 0.000119851 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.74 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 57 degrees of freedom
# Null hypothesis probability = 3.105989e-01
Photon flux (15-150 keV) in 86.93 sec: 0.110244 ( -0.0146833 0.014725 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.37106e-07 ( -1.11588e-07 1.1317e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.224 sec. to 86.704 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.47229 ( -0.404605 0.250167 )
Epeak [keV] : 9999.19 ( -9999.35 -9999.35 )
Norm@50keV : 8.91871E-04 ( -0.000891933 0.000800792 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.75 using 59 PHA bins.
# Reduced chi-squared = 1.103 for 56 degrees of freedom
# Null hypothesis probability = 2.781983e-01
Photon flux (15-150 keV) in 86.93 sec: 0.111357 ( -0.015824 0.013591 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.42728e-07 ( -1.5923e-07 1.50556e-07 ) ergs/cm2
Band function
Time interval is from -0.224 sec. to 86.704 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 15.3066 (-2.4779 3.1953)
R^2/D10^2 : 1.13491E-02 (-0.0054683 0.00971439)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.24 using 59 PHA bins.
# Reduced chi-squared = 1.408 for 57 degrees of freedom
# Null hypothesis probability = 2.293340e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.822e-08 1.304e-08
25- 50 1.952e-07 4.194e-08
50-150 3.140e-07 8.089e-08
15-150 5.574e-07 1.093e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.362 (-74.4869 -199.363)
Norm : 0.449513 (-0.0589094 0.0590393)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.38 using 59 PHA bins.
# Reduced chi-squared = 1.112 for 57 degrees of freedom
# Null hypothesis probability = 2.616572e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.730e-08 5.490e-08
25- 50 1.872e-07 1.047e-07
50-150 4.105e-07 2.258e-07
15-150 6.950e-07 3.851e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.09987 (-1.21982 1.91868)
R1^2/D10^2 : 3.93748 (-3.56606 107.836)
kT2 [keV] : 19.7952 (-4.04529 6.78985)
R2^2/D10^2 : 4.31173E-03 (-0.00272184 0.00517146)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.34 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 55 degrees of freedom
# Null hypothesis probability = 2.316359e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.066e-07 5.365e-08
25- 50 1.534e-07 4.642e-08
50-150 4.080e-07 1.532e-07
15-150 6.680e-07 2.027e-07
Peak spectrum fit
Power-law model
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.734508 ( -0.139614 0.134792 )
Norm@50keV : 2.11156E-02 ( -0.00162702 0.00161243 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.53 using 59 PHA bins.
# Reduced chi-squared = 0.9566 for 57 degrees of freedom
# Null hypothesis probability = 5.683590e-01
Photon flux (15-150 keV) in 1 sec: 2.43473 ( -0.18084 0.18108 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.53834e-07 ( -2.04506e-08 2.05697e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.731791 ( -0.198479 0.132099 )
Epeak [keV] : 9999.34 ( -9999.36 -9999.36 )
Norm@50keV : 2.12704E-02 ( -0.00154711 0.00871477 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.56 using 59 PHA bins.
# Reduced chi-squared = 0.9744 for 56 degrees of freedom
# Null hypothesis probability = 5.293506e-01
Photon flux (15-150 keV) in 1 sec: 2.44052 ( -0.2136 0.20079 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.48223e-09 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.268 sec. to 0.732 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : ( )
beta : ( )
Epeak [keV] : ( )
Norm@50keV : ( )
------------------------------------------------------------
Photon flux (15-150 keV) in 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] : 26.7667 (-3.07798 3.78682)
R^2/D10^2 : 5.03343E-02 (-0.0157866 0.0216034)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 89.02 using 59 PHA bins.
# Reduced chi-squared = 1.562 for 57 degrees of freedom
# Null hypothesis probability = 4.255705e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.035e-09 9.650e-10
25- 50 3.540e-08 4.535e-09
50-150 1.857e-07 2.190e-08
15-150 2.271e-07 2.505e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 9.15008 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 150.70 using 59 PHA bins.
# Reduced chi-squared = 2.6439 for 57 degrees of freedom
# Null hypothesis probability = 2.133967e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.278e-08 2.325e-09
25- 50 4.383e-08 1.588e-08
50-150 9.612e-08 4.985e-08
15-150 1.627e-07 5.816e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.0777 (-2.81947 3.47841)
R1^2/D10^2 : 0.415071 (-0.203411 0.508096)
kT2 [keV] : 67.1640 (-26.5595 -68.3817)
R2^2/D10^2 : 3.92401E-03 (-0.00245385 0.00889679)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.55 using 59 PHA bins.
# Reduced chi-squared = 0.9554 for 55 degrees of freedom
# Null hypothesis probability = 5.688506e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.218e-08 4.323e-09
25- 50 4.206e-08 1.694e-08
50-150 2.033e-07 1.032e-07
15-150 2.575e-07 1.149e-07
Plot creation:
Wed Feb 19 20:14:00 EST 2020