batgrbproduct analysis for trigger=946476
batgrbproduct Analysis for Trigger=946476
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 29 12:01:25 EST 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger946476/GCN5_download_cron
======================================================================
Trigger: 00946476 Segment: 000
BAT Trigger Time: 599184104 [s; MET]
Trigger Stop: 599184176 [s; MET]
UTC: 2019-12-28T00:01:19.837560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 5.3392435854354 Dec: -8.67033493468903 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.82
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 12.82
Flight Position: [ source = BAT ]
RA: 5.3392435854354 Dec: -8.67033493468903 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 5.36211143084438 Dec: -8.67890519139564 [deg; J2000]
{ 00h 21m 26.9s , -08d 40' 44.1" }
+/- 1.39311561721478 [arcmin] (estimated 90% radius based on SNR)
+/- 0.636804139560485 [arcmin] (formal 1-sigma fit error)
SNR: 18.941851868654
Angular difference between Flight and Ground position is 1.450576 arcmin
Partial Coding Fraction: 0.90625 [ including projection effects ]
Duration
T90: 194.039999961853 +/- 29.9436316450169
Measured from: -32.1719999313354
to: 161.868000030518 [s; relative to TRIGTIME]
T50: 115.515999913216 +/- 14.1969524902889
Measured from: 1.16400015354156
to: 116.680000066757 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 54.5920000076294
to: 55.5920000076294 [s; relative to TRIGTIME]
Total Fluence
Measured from: -39.3079999685287
to: 191.524000048637 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.729558 1.734174 0.916546 0.080524
0.100128 0.103696 0.091577 0.085164 [error]
Peak 0.024643 0.032581 0.017242 0.005677
0.006900 0.007100 0.006241 0.005645 [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 5.15e-07 6.90e-07 6.79e-07 1.20e-06 2.28e-06 3.08e-06 erg/cm2
Error 5.44e-08 4.84e-08 8.71e-08 3.10e-07 1.94e-07 3.99e-07 erg/cm2
Peak flux Power-law 2.68e-01 2.09e-01 1.10e-01 8.33e-02 6.24e-01 6.70e-01 ph/cm2/s
Error 9.48e-02 5.35e-02 4.86e-02 7.16e-02 1.58e-01 1.76e-01 ph/cm2/s
Fluence Cutoff-PL 5.01e-07 7.09e-07 6.71e-07 7.41e-07 2.21e-06 2.62e-06 erg/cm2
Error 6.13e-08 6.22e-08 9.28e-08 5.93e-07 2.34e-07 6.69e-07 erg/cm2
Peak flux Cutoff-PL 2.54e-01 2.22e-01 1.11e-01 4.41e-02 6.15e-01 6.31e-01 ph/cm2/s
Error 1.07e-01 7.03e-02 5.28e-02 8.37e-02 1.59e-01 1.90e-01 ph/cm2/s
Fluence Band 4.97e-07 7.05e-07 6.71e-07 8.15e-07 2.21e-06 2.72e-06 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 2.51e-01 2.21e-01 1.14e-01 4.95e-02 6.16e-01 6.35e-01 ph/cm2/s
Error -------- -------- -------- 8.32e-02 1.58e-01 -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.023 0.145 - - 1.07e-03 9.74e-05 53.030 57
CPL 1.764 0.477 38.7 0.0 1.51e-03 0.00e+00 52.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.930 0.507 - - 4.29e-03 1.45e-03 79.520 57
CPL 1.429 1.723 49.9 0.0 8.23e-03 0.00e+00 79.300 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: 166.016000 sec.
T50 in the 50-300 keV band: 83.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 230.832 -39.308 191.524
T90 194.040 -32.172 161.868
T50 115.516 1.164 116.680
Peak 1.000 54.592 55.592
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
5.3621 -8.6789 0.0102 11.3 76.6 3.1344 18.9 TRIG_00946476
------------------------------------------
Foreground time interval of the image:
-39.308 80.401 (delta_t = 119.709 [sec])
Background time interval of the image:
-239.000 -54.946 (delta_t = 184.054 [sec])
-54.000 -39.308 (delta_t = 14.692 [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
-39.308000 117.640000
119.000000 191.524000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.02262 ( -0.142104 0.147466 )
Norm@50keV : 1.07386E-03 ( -9.82286e-05 9.65063e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.03 using 59 PHA bins.
# Reduced chi-squared = 0.9303 for 57 degrees of freedom
# Null hypothesis probability = 6.247601e-01
Photon flux (15-150 keV) in 229.5 sec: 0.162777 ( -0.0114622 0.0114697 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.2757e-06 ( -1.91958e-07 1.95433e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
-39.308000 117.640000
119.000000 191.524000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76358 ( -0.602941 0.351046 )
Epeak [keV] : 38.6676 ( )
Norm@50keV : 1.50578E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9350 for 56 degrees of freedom
# Null hypothesis probability = 6.135086e-01
Photon flux (15-150 keV) in 229.5 sec: 0.160427 ( -0.012078 0.01238 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.20837e-06 ( -2.31611e-07 2.36491e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
-39.308000 117.640000
119.000000 191.524000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.76359 ( 1.87113 0.667815 )
beta : -10.0000 ( 10 4.9738e-14 )
Epeak [keV] : 38.6609 ( -19.4357 -38.6614 )
Norm@50keV : 1.50541E-03 ( -0.000461214 0.0017751 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 52.36 using 59 PHA bins.
# Reduced chi-squared = 0.9520 for 55 degrees of freedom
# Null hypothesis probability = 5.761870e-01
Photon flux (15-150 keV) in 229.5 sec: 0.160812 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.21115e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.91239 (-0.865198 0.960077)
R^2/D10^2 : 7.47107E-02 (-0.0223521 0.03171)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 96.45 using 59 PHA bins.
# Reduced chi-squared = 1.692 for 57 degrees of freedom
# Null hypothesis probability = 8.535520e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.421e-07 4.395e-08
25- 50 8.399e-07 7.000e-08
50-150 4.273e-07 8.354e-08
15-150 1.609e-06 1.397e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 65.7463 (-13.9658 19.9454)
Norm : 0.807235 (-0.0954801 0.105742)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 53.96 using 59 PHA bins.
# Reduced chi-squared = 0.9467 for 57 degrees of freedom
# Null hypothesis probability = 5.897418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.718e-07 4.475e-08
25- 50 7.378e-07 5.485e-08
50-150 9.035e-07 1.884e-07
15-150 2.113e-06 2.046e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.12716 (-1.33795 1.40888)
R1^2/D10^2 : 0.664278 (-0.390201 1.70434)
kT2 [keV] : 17.7699 (-3.73588 6.19781)
R2^2/D10^2 : 6.05737E-03 (-0.00420129 0.00564007)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.57 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 55 degrees of freedom
# Null hypothesis probability = 4.910244e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.978e-07 1.577e-07
25- 50 6.886e-07 1.867e-07
50-150 9.363e-07 4.690e-07
15-150 2.123e-06 6.529e-07
Peak spectrum fit
Power-law model
Time interval is from 54.592 sec. to 55.592 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.93040 ( -0.461903 0.551433 )
Norm@50keV : 4.29378E-03 ( -0.00149978 0.00139816 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.52 using 59 PHA bins.
# Reduced chi-squared = 1.395 for 57 degrees of freedom
# Null hypothesis probability = 2.602691e-02
Photon flux (15-150 keV) in 1 sec: 0.624308 ( -0.158321 0.158335 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94916e-08 ( -1.25328e-08 1.32829e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 54.592 sec. to 55.592 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.42918 ( -2.69903 0.747079 )
Epeak [keV] : 49.8786 ( )
Norm@50keV : 8.23354E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.30 using 59 PHA bins.
# Reduced chi-squared = 1.416 for 56 degrees of freedom
# Null hypothesis probability = 2.192629e-02
Photon flux (15-150 keV) in 1 sec: 0.615223 ( -0.157753 0.160897 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.7956e-08 ( -1.27331e-08 1.42715e-08 ) ergs/cm2
Band function
Time interval is from 54.592 sec. to 55.592 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.43333 ( -0.236049 6.76373 )
beta : -10.0000 ( 10 1.1724e-13 )
Epeak [keV] : 49.7420 ( -39.8688 -49.7449 )
Norm@50keV : 8.20493E-03 ( -0.00503305 0.289033 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.30 using 59 PHA bins.
# Reduced chi-squared = 1.442 for 55 degrees of freedom
# Null hypothesis probability = 1.763602e-02
Photon flux (15-150 keV) in 1 sec: 0.616328 ( 6.38367 -0.155892 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.78225e-08 ( -3.78155e-08 -1.26341e-08 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7388 (-2.82168 3.97436)
R^2/D10^2 : 0.228174 (-0.157759 0.477579)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 82.36 using 59 PHA bins.
# Reduced chi-squared = 1.445 for 57 degrees of freedom
# Null hypothesis probability = 1.563443e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.469e-09 2.839e-09
25- 50 1.499e-08 8.193e-09
50-150 9.582e-09 6.942e-09
15-150 3.004e-08 1.578e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 77.1186 (-41.9582 -77.1186)
Norm : 2.98329 (-0.891828 1.51541)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.34 using 59 PHA bins.
# Reduced chi-squared = 1.392 for 57 degrees of freedom
# Null hypothesis probability = 2.688453e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.721e-09 4.731e-09
25- 50 1.260e-08 7.503e-09
50-150 1.734e-08 1.468e-08
15-150 3.766e-08 2.478e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 1.25350 (-1.25936 2.72942)
R1^2/D10^2 : 3.54088E+04 (-31631.9 -31635.8)
kT2 [keV] : 12.4159 (-3.4104 5.25594)
R2^2/D10^2 : 0.124332 (-0.0923006 0.166929)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.59 using 59 PHA bins.
# Reduced chi-squared = 1.393 for 55 degrees of freedom
# Null hypothesis probability = 2.873825e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.120e-09 2.967e-09
25- 50 1.330e-08 7.885e-09
50-150 1.260e-08 8.565e-09
15-150 3.202e-08 1.852e-08
Plot creation:
Sun Dec 29 12:04:50 EST 2019