batgrbproduct analysis for trigger=882747
batgrbproduct Analysis for Trigger=882747
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 10 05:21:16 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger882747/GCN5_download_cron
======================================================================
Trigger: 00882747 Segment: 000
BAT Trigger Time: 568703584 [s; MET]
Trigger Stop: 568703680 [s; MET]
UTC: 2019-01-09T05:12:41.780680 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 33.2181437048103 Dec: 38.1099859036362 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 19.78
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 19.78
Flight Position: [ source = BAT ]
RA: 33.2181437048103 Dec: 38.1099859036362 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 33.2135475665272 Dec: 38.1109007367732 [deg; J2000]
{ 02h 12m 51.3s , +38d 06' 39.2" }
+/- 1.03047143037983 [arcmin] (estimated 90% radius based on SNR)
+/- 0.372366814010977 [arcmin] (formal 1-sigma fit error)
SNR: 29.1404051973468
Angular difference between Flight and Ground position is 0.223816 arcmin
Partial Coding Fraction: 0.2851562 [ including projection effects ]
Duration
T90: 104.015999913216 +/- 33.4435856216658
Measured from: 12.2640001773834
to: 116.280000090599 [s; relative to TRIGTIME]
T50: 48.0199999809265 +/- 3.68164527132188
Measured from: 31.5000001192093
to: 79.5200001001358 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 38.8159999847412
to: 39.8159999847412 [s; relative to TRIGTIME]
Total Fluence
Measured from: 5.86800003051758
to: 205.363999962807 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.168514 4.589600 2.372702 0.360630
0.144394 0.151006 0.129258 0.108707 [error]
Peak 0.073761 0.074174 0.074711 0.006285
0.013726 0.015337 0.012667 0.009441 [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-06 1.78e-06 1.95e-06 4.02e-06 6.17e-06 8.96e-06 erg/cm2
Error 8.47e-08 7.89e-08 1.25e-07 5.29e-07 2.96e-07 6.45e-07 erg/cm2
Peak flux Power-law 6.77e-01 6.20e-01 3.93e-01 3.82e-01 1.85e+00 2.07e+00 ph/cm2/s
Error 1.95e-01 1.19e-01 9.78e-02 1.83e-01 3.51e-01 3.92e-01 ph/cm2/s
Fluence Cutoff-PL 9.77e-07 2.03e-06 1.94e-06 7.11e-07 5.49e-06 5.66e-06 erg/cm2
Error 1.04e-07 1.09e-07 1.54e-07 3.24e-07 3.36e-07 4.57e-07 erg/cm2
Peak flux Cutoff-PL 5.93e-01 6.79e-01 4.26e-01 1.76e-01 1.81e+00 1.87e+00 ph/cm2/s
Error 2.35e-01 1.51e-01 1.17e-01 2.82e-01 3.57e-01 4.26e-01 ph/cm2/s
Fluence Band 9.28e-07 2.07e-06 1.86e-06 1.71e-06 5.61e-06 6.60e-06 erg/cm2
Error 1.09e-07 1.18e-07 1.55e-07 -------- 3.31e-07 8.15e-07 erg/cm2
Peak flux Band 6.03e-01 6.71e-01 4.24e-01 1.96e-01 1.82e+00 1.89e+00 ph/cm2/s
Error -------- -------- 1.14e-01 -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.867 0.078 - - 3.38e-03 1.62e-04 86.100 57
CPL 0.394 0.471 49.7 4.1 2.06e-02 1.29e-02 46.260 56
The chi2 of BB fit is 77.93 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 1.659 0.306 - - 1.41e-02 2.82e-03 63.060 57
CPL 0.835 1.135 70.4 -21.0 3.75e-02 1.17e-01 61.740 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: 82.752000 sec.
T50 in the 50-300 keV band: 36.800000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 199.496 5.868 205.364
T90 104.016 12.264 116.280
T50 48.020 31.500 79.520
Peak 1.000 38.816 39.816
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
33.2135 +38.1109 0.0066 32.7 75.1 9.6805 29.1 TRIG_00882747
------------------------------------------
Foreground time interval of the image:
5.868 104.701 (delta_t = 98.833 [sec])
Background time interval of the image:
-239.000 5.868 (delta_t = 244.868 [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
Multiple GTIs in the spectrum
tstart tstop
5.868000 111.970000
113.000000 205.364000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.86706 ( -0.0778006 0.0789511 )
Norm@50keV : 3.38215E-03 ( -0.000162246 0.000161434 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 86.10 using 59 PHA bins.
# Reduced chi-squared = 1.511 for 57 degrees of freedom
# Null hypothesis probability = 7.660466e-03
Photon flux (15-150 keV) in 198.5 sec: 0.478729 ( -0.0217895 0.0218289 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.17196e-06 ( -2.95781e-07 2.97141e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
5.868000 111.970000
113.000000 205.364000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.393513 ( -0.495564 0.445884 )
Epeak [keV] : 49.6912 ( -3.55614 4.54706 )
Norm@50keV : 2.05770E-02 ( -0.00861195 0.0172287 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.26 using 59 PHA bins.
# Reduced chi-squared = 0.8261 for 56 degrees of freedom
# Null hypothesis probability = 8.200711e-01
Photon flux (15-150 keV) in 198.5 sec: 0.442906 ( -0.023644 0.023733 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.49251e-06 ( -3.32408e-07 3.40487e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
5.868000 111.970000
113.000000 205.364000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.393492 ( -0.34733 0.365316 )
beta : -10.00000 ( 10 3.39035e-06 )
Epeak [keV] : 49.6820 ( -3.50128 4.51297 )
Norm@50keV : 2.05788E-02 ( -0.00856587 0.00762552 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.26 using 59 PHA bins.
# Reduced chi-squared = 0.8411 for 55 degrees of freedom
# Null hypothesis probability = 7.931563e-01
Photon flux (15-150 keV) in 198.5 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 5.60747e-06 ( -5.60608e-06 -3.33321e-07 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.8487 (-0.530864 0.557629)
R^2/D10^2 : 0.120673 (-0.0195023 0.0230923)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 77.93 using 59 PHA bins.
# Reduced chi-squared = 1.367 for 57 degrees of freedom
# Null hypothesis probability = 3.421815e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.105e-07 5.062e-08
25- 50 2.203e-06 1.072e-07
50-150 1.843e-06 1.872e-07
15-150 4.756e-06 2.253e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 85.9860 (-11.5278 14.6078)
Norm : 2.20210 (-0.145736 0.157831)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.69 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 57 degrees of freedom
# Null hypothesis probability = 4.133240e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.139e-06 6.977e-08
25- 50 1.906e-06 8.545e-08
50-150 2.821e-06 2.997e-07
15-150 5.866e-06 3.424e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.21225 (-2.12517 1.31914)
R1^2/D10^2 : 0.236694 (-0.0678056 0.17604)
kT2 [keV] : 25.0842 (-9.53235 36.4371)
R2^2/D10^2 : 3.21173E-03 (-0.00245152 0.018469)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.94 using 59 PHA bins.
# Reduced chi-squared = 0.8534 for 55 degrees of freedom
# Null hypothesis probability = 7.720388e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.549e-07 1.205e-07
25- 50 2.126e-06 3.398e-07
50-150 2.552e-06 9.274e-07
15-150 5.533e-06 1.336e-06
Peak spectrum fit
Power-law model
Time interval is from 38.816 sec. to 39.816 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65854 ( -0.298092 0.314081 )
Norm@50keV : 1.41263E-02 ( -0.00284464 0.00279176 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.06 using 59 PHA bins.
# Reduced chi-squared = 1.106 for 57 degrees of freedom
# Null hypothesis probability = 2.708735e-01
Photon flux (15-150 keV) in 1 sec: 1.84978 ( -0.350356 0.350713 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.3127e-07 ( -2.74683e-08 2.78073e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 38.816 sec. to 39.816 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.835381 ( -1.60778 0.663229 )
Epeak [keV] : 70.4460 ( -28.3821 -70.4481 )
Norm@50keV : 3.74987E-02 ( -0.0374982 0.196895 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.74 using 59 PHA bins.
# Reduced chi-squared = 1.102 for 56 degrees of freedom
# Null hypothesis probability = 2.785077e-01
Photon flux (15-150 keV) in 1 sec: 1.81496 ( -0.35837 0.35626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.27067e-07 ( -2.80154e-08 2.8663e-08 ) ergs/cm2
Band function
Time interval is from 38.816 sec. to 39.816 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.836864 ( -0.794565 1.5672 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 70.4433 ( -23.7724 56.8938 )
Norm@50keV : 3.74447E-02 ( -0.0374447 0.196967 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.74 using 59 PHA bins.
# Reduced chi-squared = 1.123 for 55 degrees of freedom
# Null hypothesis probability = 2.479389e-01
Photon flux (15-150 keV) in 1 sec: 1.82293 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29605e-07 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.4082 (-2.7801 3.44259)
R^2/D10^2 : 0.247986 (-0.134809 0.28675)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.44 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 57 degrees of freedom
# Null hypothesis probability = 1.838045e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.084e-08 4.049e-09
25- 50 4.147e-08 1.311e-08
50-150 5.751e-08 2.307e-08
15-150 1.098e-07 3.148e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 151.568 (-76.5918 -149.39)
Norm : 7.71985 (-1.54491 2.06152)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.10 using 59 PHA bins.
# Reduced chi-squared = 1.090 for 57 degrees of freedom
# Null hypothesis probability = 2.993101e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.981e-08 1.127e-08
25- 50 3.677e-08 2.018e-08
50-150 7.290e-08 4.442e-08
15-150 1.295e-07 7.535e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.73328 (-1.95873 4.46493)
R1^2/D10^2 : 20.3228 (-19.3578 1837.46)
kT2 [keV] : 17.5287 (-3.94505 7.13943)
R2^2/D10^2 : 0.109657 (-0.0828795 0.177522)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.36 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 55 degrees of freedom
# Null hypothesis probability = 2.882086e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.990e-08 1.051e-08
25- 50 3.469e-08 1.727e-08
50-150 6.829e-08 4.242e-08
15-150 1.229e-07 6.369e-08
Plot creation:
Thu Jan 10 05:25:05 EST 2019