batgrbproduct analysis for trigger=885314
batgrbproduct Analysis for Trigger=885314
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): Thu Jan 24 11:36:56 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger885314/GCN5_download_cron
======================================================================
Trigger: 00885314 Segment: 000
BAT Trigger Time: 569938775.488 [s; MET]
Trigger Stop: 569938783.68 [s; MET]
UTC: 2019-01-23T12:19:13.191160 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 53.2292503021484 Dec: 45.4840092707705 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.49
Image Trigger?: NO
Rate S/N Ratio: 16.5529453572468 [ if not an image trigger ]
Image S/N Ratio: 11.49
Flight Position: [ source = BAT ]
RA: 53.2292503021484 Dec: 45.4840092707705 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 53.1751403272988 Dec: 45.5045207610791 [deg; J2000]
{ 03h 32m 42.0s , +45d 30' 16.3" }
+/- 1.7419481253681 [arcmin] (estimated 90% radius based on SNR)
+/- 0.79447593707291 [arcmin] (formal 1-sigma fit error)
SNR: 13.7651945756906
Angular difference between Flight and Ground position is 2.587252 arcmin
Partial Coding Fraction: 0.6484375 [ including projection effects ]
Duration
T90: 24.3759999275208 +/- 4.33538842744653
Measured from: 0.984000086784363
to: 25.3600000143051 [s; relative to TRIGTIME]
T50: 11.5239999294281 +/- 5.72684902592845
Measured from: 3.20000004768372
to: 14.7239999771118 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 4.8199999332428
to: 5.8199999332428 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.22000002861023
to: 28.055999994278 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.301577 0.303719 0.427896 0.177517
0.045516 0.047768 0.042739 0.038303 [error]
Peak 0.026381 0.029328 0.046073 0.022398
0.008874 0.009543 0.008614 0.007756 [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 7.25e-08 1.68e-07 3.08e-07 1.35e-06 8.36e-07 1.90e-06 erg/cm2
Error 1.85e-08 2.48e-08 4.18e-08 4.41e-07 1.08e-07 4.59e-07 erg/cm2
Peak flux Power-law 2.26e-01 3.01e-01 2.94e-01 5.15e-01 9.90e-01 1.34e+00 ph/cm2/s
Error 1.09e-01 8.75e-02 6.84e-02 2.77e-01 2.28e-01 3.11e-01 ph/cm2/s
Fluence Cutoff-PL 7.24e-08 1.68e-07 3.08e-07 1.34e-06 8.36e-07 1.89e-06 erg/cm2
Error 1.46e-08 2.48e-08 3.25e-08 4.89e-07 1.07e-07 4.87e-07 erg/cm2
Peak flux Cutoff-PL 2.29e-01 3.03e-01 2.94e-01 5.05e-01 9.92e-01 1.33e+00 ph/cm2/s
Error 1.72e-01 8.96e-02 7.97e-02 4.19e-01 2.30e-01 4.56e-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 1.126 0.225 - - 2.75e-03 3.30e-04 64.910 57
CPL 1.120 0.472 10000.0 0.0 2.77e-03 3.28e-04 64.920 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.033 0.415 - - 8.59e-03 1.92e-03 70.050 57
CPL 1.037 0.419 9999.4 0.0 8.64e-03 2.65e-02 70.060 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: 16.960000 sec.
T50 in the 50-300 keV band: 7.232000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 29.276 -1.220 28.056
T90 24.376 0.984 25.360
T50 11.524 3.200 14.724
Peak 1.000 4.820 5.820
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
53.1751 +45.5045 0.0140 32.2 -146.0 1.2844 13.8 TRIG_00885314
------------------------------------------
Foreground time interval of the image:
-1.220 28.056 (delta_t = 29.276 [sec])
Background time interval of the image:
-239.488 -155.028 (delta_t = 84.460 [sec])
-153.488 -1.220 (delta_t = 152.268 [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 -1.220 sec. to 28.056 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12555 ( -0.228458 0.222259 )
Norm@50keV : 2.75284E-03 ( -0.000330994 0.000329693 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.91 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 57 degrees of freedom
# Null hypothesis probability = 2.203694e-01
Photon flux (15-150 keV) in 29.28 sec: 0.320147 ( -0.0402467 0.0404179 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.35982e-07 ( -1.07348e-07 1.07895e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.220 sec. to 28.056 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12032 ( -0.66953 0.273567 )
Epeak [keV] : 1.00000E+04 ( -10000 -10000 )
Norm@50keV : 2.76708E-03 ( -0.000328455 0.000327689 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.92 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 56 degrees of freedom
# Null hypothesis probability = 1.937408e-01
Photon flux (15-150 keV) in 29.28 sec: 0.320266 ( -0.040439 0.019826 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.36415e-07 ( -1.07519e-07 1.06696e-07 ) ergs/cm2
Band function
Time interval is from -1.220 sec. to 28.056 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.911965 ( 0.911974 0.911974 )
beta : -1.12555 ( 1.12554 0.228437 )
Epeak [keV] : 51.2707 ( -51.2619 -51.2619 )
Norm@50keV : 4.79987E-03 ( -0.00237396 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.91 using 59 PHA bins.
# Reduced chi-squared = 1.180 for 55 degrees of freedom
# Null hypothesis probability = 1.694859e-01
Photon flux (15-150 keV) in 29.28 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] : 23.0003 (-3.42896 4.41957)
R^2/D10^2 : 9.46468E-03 (-0.00401435 0.00644662)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.61 using 59 PHA bins.
# Reduced chi-squared = 1.397 for 57 degrees of freedom
# Null hypothesis probability = 2.564121e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.657e-08 6.513e-09
25- 50 1.441e-07 3.082e-08
50-150 5.696e-07 1.142e-07
15-150 7.403e-07 1.291e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-31.4451 -200)
Norm : 1.34186 (-0.164171 0.164171)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.86 using 59 PHA bins.
# Reduced chi-squared = 1.348 for 57 degrees of freedom
# Null hypothesis probability = 4.090714e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.781e-08 5.453e-08
25- 50 1.881e-07 1.042e-07
50-150 4.126e-07 2.255e-07
15-150 6.986e-07 3.808e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.17008 (-1.25111 1.73824)
R1^2/D10^2 : 2.27922 (-1.80752 12.0012)
kT2 [keV] : 28.2057 (-5.00807 7.67067)
R2^2/D10^2 : 4.67941E-03 (-0.00240933 0.00400796)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.35 using 59 PHA bins.
# Reduced chi-squared = 1.079 for 55 degrees of freedom
# Null hypothesis probability = 3.201857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.169e-08 4.763e-08
25- 50 1.364e-07 4.249e-08
50-150 6.110e-07 1.962e-07
15-150 8.391e-07 2.398e-07
Peak spectrum fit
Power-law model
Time interval is from 4.820 sec. to 5.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03260 ( -0.43211 0.397908 )
Norm@50keV : 8.58562E-03 ( -0.00193621 0.00189974 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.05 using 59 PHA bins.
# Reduced chi-squared = 1.229 for 57 degrees of freedom
# Null hypothesis probability = 1.147839e-01
Photon flux (15-150 keV) in 1 sec: 0.990456 ( -0.227116 0.229191 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17958e-08 ( -2.1157e-08 2.13256e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 4.820 sec. to 5.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03740 ( -0.443425 0.393889 )
Epeak [keV] : 9999.36 ( -9999.36 -9999.36 )
Norm@50keV : 8.63586E-03 ( -0.00191139 0.0511847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.06 using 59 PHA bins.
# Reduced chi-squared = 1.251 for 56 degrees of freedom
# Null hypothesis probability = 9.800308e-02
Photon flux (15-150 keV) in 1 sec: 0.991665 ( -0.232629 0.227435 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17559e-08 ( -2.17019e-08 2.12281e-08 ) ergs/cm2
Band function
Time interval is from 4.820 sec. to 5.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.866013 ( 0.866013 0.866013 )
beta : -1.03263 ( -0.398291 0.432155 )
Epeak [keV] : 42.4173 ( -42.4172 -42.4172 )
Norm@50keV : 1.43484E-02 ( -0.0076206 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.05 using 59 PHA bins.
# Reduced chi-squared = 1.274 for 55 degrees of freedom
# Null hypothesis probability = 8.313150e-02
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] : 20.9189 (-4.81323 8.05898)
R^2/D10^2 : 4.10430E-02 (-0.0265277 0.056181)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.70 using 59 PHA bins.
# Reduced chi-squared = 1.275 for 57 degrees of freedom
# Null hypothesis probability = 7.858700e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.399e-09 1.618e-09
25- 50 1.743e-08 7.535e-09
50-150 5.682e-08 2.442e-08
15-150 7.765e-08 3.620e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-68.6364 -200)
Norm : 4.15157 (-0.937645 0.937645)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 75.07 using 59 PHA bins.
# Reduced chi-squared = 1.317 for 57 degrees of freedom
# Null hypothesis probability = 5.461246e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.034e-08 6.075e-09
25- 50 1.989e-08 1.196e-08
50-150 4.361e-08 2.578e-08
15-150 7.384e-08 4.343e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.79599 (-1.6076 1.98585)
R1^2/D10^2 : 1362.17 (-1829.84 -1837.04)
kT2 [keV] : 22.9144 (-5.62749 10.3992)
R2^2/D10^2 : 2.96496E-02 (-0.0207532 0.0456546)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.16 using 59 PHA bins.
#Fit statistic : Chi-Squared = 67.11 using 59 PHA bins.
# Reduced chi-squared = 1.221 for 55 degrees of freedom
# Reduced chi-squared = 1.220 for 55 degrees of freedom
# Null hypothesis probability = 1.259159e-01
# Null hypothesis probability = 1.266663e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.918e-09 3.749e-09
25- 50 1.533e-08 7.757e-09
50-150 6.008e-08 3.043e-08
15-150 8.333e-08 4.423e-08
Plot creation:
Thu Jan 24 11:40:57 EST 2019