batgrbproduct Analysis for Trigger=727288
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): Sun Dec 18 10:41:15 EST 2016
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger727288/batgroup_hand_proc
======================================================================
Trigger: 00727288 Segment: 000
BAT Trigger Time: 503725673.472 [s; MET]
Trigger Stop: 503725674.496 [s; MET]
UTC: 2016-12-18T03:47:36.148280 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.25705184263 Dec: -4.11356983789782 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 25.38
Image Trigger?: NO
Rate S/N Ratio: 238.077718403046 [ if not an image trigger ]
Image S/N Ratio: 25.38
Flight Position: [ source = BAT ]
RA: 245.25705184263 Dec: -4.11356983789782 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.250349203541 Dec: -4.11285146316003 [deg; J2000]
{ 16h 21m 00.1s , -04d 06' 46.3" }
+/- 0.613001204658605 [arcmin] (estimated 90% radius based on SNR)
+/- 0.13302725269202 [arcmin] (formal 1-sigma fit error)
SNR: 61.1991026599756
Angular difference between Flight and Ground position is 0.403432 arcmin
Partial Coding Fraction: 0.609375 [ including projection effects ]
Duration
T90: 7.10399997234344 +/- 0.550447060010061
Measured from: -0.332000017166138
to: 6.77199995517731 [s; relative to TRIGTIME]
T50: 2.97199994325638 +/- 0.0913016685834815
Measured from: 0.667999982833862
to: 3.63999992609024 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.26800000667572
to: 1.26800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.39600002765656
to: 14.5 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.078002 3.714669 3.377446 0.769350
0.044428 0.050559 0.047956 0.031442 [error]
Peak 0.363966 0.808551 0.907242 0.222617
0.015345 0.020489 0.021663 0.012814 [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 7.21e-07 1.51e-06 2.47e-06 9.15e-06 6.83e-06 1.39e-05 erg/cm2
Error 2.79e-08 3.50e-08 5.08e-08 4.25e-07 1.31e-07 4.48e-07 erg/cm2
Peak flux Power-law 3.99e+00 5.43e+00 5.45e+00 9.91e+00 1.81e+01 2.48e+01 ph/cm2/s
Error -------- -------- -------- -------- -------- -------- ph/cm2/s
Fluence Cutoff-PL 5.87e-07 1.56e-06 2.68e-06 4.33e-06 6.65e-06 9.15e-06 erg/cm2
Error 3.61e-08 3.83e-08 6.59e-08 6.01e-07 1.38e-07 6.00e-07 erg/cm2
Peak flux Cutoff-PL 3.05e+00 5.70e+00 6.19e+00 4.63e+00 1.76e+01 1.96e+01 ph/cm2/s
Error 2.79e-01 2.18e-01 2.32e-01 6.99e-01 5.39e-01 8.64e-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 1.287 0.033 - - 4.33e-02 8.20e-04 111.220 57
CPL 0.557 0.156 117.2 13.3 8.88e-02 1.33e-02 38.160 56
The chi2 of BB fit is Chi-Squared Chi-Squared 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 0.994 0.000 - - 1.57e-01 0.00e+00 125.140 57
CPL 0.004 0.229 119.0 15.0 4.24e-01 9.51e-02 58.270 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: 5.120000 sec.
T50 in the 50-300 keV band: 2.496000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 15.896 -1.396 14.500
T90 7.104 -0.332 6.772
T50 2.972 0.668 3.640
Peak 1.000 0.268 1.268
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.2503 -4.1129 0.0031 24.7149 -68.1876 10.2465511 61.199 TRIG_00727288
Foreground time interval of the image:
-1.396 14.500 (delta_t = 15.896 [sec])
Background time interval of the image:
-280.771 -259.642 (delta_t = 21.129 [sec])
-239.472 -1.396 (delta_t = 238.076 [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 -1.396 sec. to 14.500 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.28705 ( -0.0326976 0.0326255 )
Norm@50keV : 4.33231E-02 ( -0.000820021 0.000819544 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 111.22 using 59 PHA bins.
# Reduced chi-squared = 1.9513 for 57 degrees of freedom
# Null hypothesis probability = 2.316387e-05
Photon flux (15-150 keV) in 15.9 sec: 5.15644 ( -0.107161 0.107371 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.82873e-06 ( -1.30866e-07 1.30902e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.396 sec. to 14.500 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.556676 ( -0.15852 0.153583 )
Epeak [keV] : 117.222 ( -10.8302 15.6856 )
Norm@50keV : 8.88058E-02 ( -0.0121466 0.0145183 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 38.16 using 59 PHA bins.
# Reduced chi-squared = 0.6814 for 56 degrees of freedom
# Null hypothesis probability = 9.673512e-01
Photon flux (15-150 keV) in 15.9 sec: 4.93713 ( -0.11322 0.11372 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.65188e-06 ( -1.38457e-07 1.37917e-07 ) ergs/cm2
Band function
Time interval is from -1.396 sec. to 14.500 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.231069 ( -0.365823 0.452972 )
beta : -1.68134 ( -0.520143 0.127654 )
Epeak [keV] : 89.4546 ( -18.1396 29.4742 )
Norm@50keV : 0.132128 ( -0.0458911 0.102775 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.83 using 59 PHA bins.
# Reduced chi-squared = 0.6333 for 55 degrees of freedom
# Null hypothesis probability = 9.846352e-01
Photon flux (15-150 keV) in 15.9 sec: 4.88474 ( 2.11526 -0.12094 ) 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] : 19.6068 ( )
R^2/D10^2 : 0.251728 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 342.69 using 59 PHA bins.
# Reduced chi-squared = 6.0121 for 57 degrees of freedom
# Null hypothesis probability = 2.155884e-42
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.989e-07 1.105e-08
25- 50 1.469e-06 4.309e-08
50-150 4.175e-06 1.097e-07
15-150 5.943e-06 1.256e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 22.1964 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 299.09 using 59 PHA bins.
# Reduced chi-squared = 5.2473 for 57 degrees of freedom
# Null hypothesis probability = 1.541067e-34
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.788e-07 1.821e-08
25- 50 1.690e-06 3.657e-08
50-150 3.708e-06 7.314e-08
15-150 6.277e-06 1.344e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 10.2209 (-1.03469 1.07466)
R1^2/D10^2 : 1.19917 (-0.263456 0.387623)
kT2 [keV] : 31.6637 (-2.97509 4.25623)
R2^2/D10^2 : 3.73509E-02 (-0.0139015 0.0172206)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.99 using 59 PHA bins.
# Reduced chi-squared = 0.7634 for 55 degrees of freedom
# Null hypothesis probability = 9.014634e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.986e-07 3.736e-08
25- 50 1.615e-06 7.274e-08
50-150 4.510e-06 2.735e-07
15-150 6.624e-06 4.086e-07
Peak spectrum fit
Power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.994040 ( )
Norm@50keV : 0.156970 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 125.14 using 59 PHA bins.
# Reduced chi-squared = 2.1954 for 57 degrees of freedom
# Null hypothesis probability = 5.135250e-07
Photon flux (15-150 keV) in 1 sec: 18.0658 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70101e-06 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.93822E-03 ( -0.234368 0.223047 )
Epeak [keV] : 119.024 ( -12.1146 17.7938 )
Norm@50keV : 0.423877 ( -0.0825009 0.107656 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.27 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 56 degrees of freedom
# Null hypothesis probability = 3.918567e-01
Photon flux (15-150 keV) in 1 sec: 17.6111 ( -0.5381 0.539 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66245e-06 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.268 sec. to 1.268 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.80335E-03 ( -0.150062 0.186779 )
beta : -10.00000 ( 10 20 )
Epeak [keV] : 119.002 ( -16.0677 17.7907 )
Norm@50keV : 0.423955 ( -0.0825853 0.0927317 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.27 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 55 degrees of freedom
# Null hypothesis probability = 3.560408e-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] : 21.9285 ( )
R^2/D10^2 : 0.692254 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 134.63 using 59 PHA bins.
# Reduced chi-squared = 2.3620 for 57 degrees of freedom
# Null hypothesis probability = 3.167757e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.170e-08 3.315e-09
25- 50 3.256e-07 1.305e-08
50-150 1.170e-06 5.200e-08
15-150 1.557e-06 5.100e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 72.8564 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 485.38 using 59 PHA bins.
# Reduced chi-squared = 8.5154 for 57 degrees of freedom
# Null hypothesis probability = 3.044257e-69
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.814e-07 5.550e-09
25- 50 3.490e-07 1.035e-08
50-150 7.654e-07 2.425e-08
15-150 1.296e-06 3.850e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 11.3087 (-2.22729 2.44347)
R1^2/D10^2 : 2.43097 (-0.760043 1.52433)
kT2 [keV] : 32.2642 (-4.2691 8.48612)
R2^2/D10^2 : 0.155149 (-0.0897724 0.113069)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.79 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Null hypothesis probability = 3.727599e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.942e-08 1.293e-08
25- 50 3.444e-07 3.700e-08
50-150 1.232e-06 2.167e-07
15-150 1.666e-06 2.345e-07
Plot creation:
Sun Dec 18 11:03:00 EST 2016