batgrbproduct analysis for trigger=893808
batgrbproduct Analysis for Trigger=893808
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): Wed Mar 20 21:31:28 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger893808/GCN5_download_cron
======================================================================
Trigger: 00893808 Segment: 000
BAT Trigger Time: 574737299.2 [s; MET]
Trigger Stop: 574737307.392 [s; MET]
UTC: 2019-03-20T01:14:36.601140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 117.8105857429 Dec: -45.8897753307729 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.63
Image Trigger?: NO
Rate S/N Ratio: 11.4455231422596 [ if not an image trigger ]
Image S/N Ratio: 7.63
Flight Position: [ source = BAT ]
RA: 117.8105857429 Dec: -45.8897753307729 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 117.822203772553 Dec: -45.8767559402986 [deg; J2000]
{ 07h 51m 17.3s , -45d 52' 36.3" }
+/- 1.89623665447653 [arcmin] (estimated 90% radius based on SNR)
+/- 0.753211808334368 [arcmin] (formal 1-sigma fit error)
SNR: 12.1935184856297
Angular difference between Flight and Ground position is 0.919613 arcmin
Partial Coding Fraction: 0.296875 [ including projection effects ]
Duration
T90: 64 +/- 12.0830459735946
Measured from: -24.1999999284744
to: 39.8000000715256 [s; relative to TRIGTIME]
T50: 25 +/- 8.94427190999916
Measured from: -13.1999999284744
to: 11.8000000715256 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.200000047683716
to: 0.799999952316284 [s; relative to TRIGTIME]
Total Fluence
Measured from: -27.2000000476837
to: 44.7999999523163 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.739746 1.133279 1.419318 0.494315
0.144968 0.147799 0.127776 0.111956 [error]
Peak 0.038870 0.035917 0.088145 0.017142
0.018572 0.018278 0.016794 0.013434 [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 2.74e-07 5.92e-07 1.00e-06 3.91e-06 2.75e-06 5.78e-06 erg/cm2
Error 6.50e-08 8.38e-08 1.19e-07 1.08e-06 3.09e-07 1.12e-06 erg/cm2
Peak flux Power-law 4.35e-01 4.39e-01 3.10e-01 3.49e-01 1.32e+00 1.53e+00 ph/cm2/s
Error 2.76e-01 1.77e-01 1.25e-01 2.85e-01 5.00e-01 5.39e-01 ph/cm2/s
Fluence Cutoff-PL 2.61e-07 5.96e-07 1.03e-06 3.23e-06 2.74e-06 5.12e-06 erg/cm2
Error 8.08e-08 8.67e-08 1.45e-07 -------- 3.13e-07 1.75e-06 erg/cm2
Peak flux Cutoff-PL 5.98e-03 2.38e-01 5.89e-01 3.33e-02 8.66e-01 8.65e-01 ph/cm2/s
Error 3.45e-02 1.41e-01 1.88e-01 -------- 2.72e-01 2.73e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 4.56e-02 3.40e-01 5.19e-01 7.28e-02 9.77e-01 9.82e-01 ph/cm2/s
Error -------- 1.59e-01 -------- -------- -------- -------- ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.238 0.198 - - 3.81e-03 4.30e-04 59.760 57
CPL 1.070 0.677 340.2 0.0 4.48e-03 3.08e-03 59.610 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.499 0.606 - - 1.06e-02 3.72e-03 70.400 57
CPL -9.979 0.776 68.3 8.9 1.12e+02 2.19e+02 63.150 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: 30.080000 sec.
T50 in the 50-300 keV band: 18.560000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 72.000 -27.200 44.800
T90 64.000 -24.200 39.800
T50 25.000 -13.200 11.800
Peak 1.000 -0.200 0.800
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
117.8222 -45.8768 0.0157 49.8 3.7 4.0112 12.2 TRIG_00893808
------------------------------------------
Foreground time interval of the image:
-27.200 44.800 (delta_t = 72.000 [sec])
Background time interval of the image:
-239.200 -27.200 (delta_t = 212.000 [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 -27.200 sec. to 44.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23774 ( -0.200738 0.194928 )
Norm@50keV : 3.81051E-03 ( -0.000431676 0.00042847 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.76 using 59 PHA bins.
# Reduced chi-squared = 1.048 for 57 degrees of freedom
# Null hypothesis probability = 3.757949e-01
Photon flux (15-150 keV) in 72 sec: 0.449796 ( -0.0555171 0.0560439 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.75472e-06 ( -3.08652e-07 3.09172e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -27.200 sec. to 44.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06994 ( -0.848185 0.506497 )
Epeak [keV] : 340.207 ( -340.204 -340.204 )
Norm@50keV : 4.47648E-03 ( -0.00100384 0.00515151 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.61 using 59 PHA bins.
# Reduced chi-squared = 1.064 for 56 degrees of freedom
# Null hypothesis probability = 3.457407e-01
Photon flux (15-150 keV) in 72 sec: 0.445301 ( -0.058913 0.058599 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.74431e-06 ( -3.14842e-07 3.11573e-07 ) ergs/cm2
Band function
Time interval is from -27.200 sec. to 44.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.07000 ( 0.956789 0.956789 )
beta : -10.0000 ( 10 3.55271e-15 )
Epeak [keV] : 340.314 ( -188.407 -340.314 )
Norm@50keV : 4.47564E-03 ( -0.000758892 0.00515254 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.61 using 59 PHA bins.
# Reduced chi-squared = 1.084 for 55 degrees of freedom
# Null hypothesis probability = 3.116784e-01
Photon flux (15-150 keV) in 72 sec: 0.433371 ( ) 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] : 22.3896 (-2.94068 3.61753)
R^2/D10^2 : 1.40226E-02 (-0.00551783 0.00855827)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 74.68 using 59 PHA bins.
# Reduced chi-squared = 1.310 for 57 degrees of freedom
# Null hypothesis probability = 5.804164e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.291e-08 2.366e-08
25- 50 4.964e-07 9.522e-08
50-150 1.859e-06 3.067e-07
15-150 2.449e-06 3.636e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-29.1675 -200)
Norm : 1.95150 (-0.217809 0.217809)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.87 using 59 PHA bins.
# Reduced chi-squared = 1.208 for 57 degrees of freedom
# Null hypothesis probability = 1.347025e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.498e-07 1.957e-07
25- 50 6.729e-07 3.701e-07
50-150 1.476e-06 7.151e-07
15-150 2.498e-06 1.283e-06
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.25587 (-1.64148 2.71281)
R1^2/D10^2 : 1.17914 (-0.956254 5.42408)
kT2 [keV] : 27.8830 (-4.70545 7.66276)
R2^2/D10^2 : 6.26080E-03 (-0.0034547 0.00547959)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.67 using 59 PHA bins.
# Reduced chi-squared = 1.030 for 55 degrees of freedom
# Null hypothesis probability = 4.125709e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.083e-07 1.622e-07
25- 50 5.275e-07 2.053e-07
50-150 1.938e-06 6.343e-07
15-150 2.774e-06 7.265e-07
Peak spectrum fit
Power-law model
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49873 ( -0.584403 0.626891 )
Norm@50keV : 1.05937E-02 ( -0.00372504 0.00372284 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.40 using 59 PHA bins.
# Reduced chi-squared = 1.235 for 57 degrees of freedom
# Null hypothesis probability = 1.094363e-01
Photon flux (15-150 keV) in 1 sec: 1.32205 ( -0.494302 0.506307 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.00518e-07 ( -3.65957e-08 3.68845e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.97940 ( 9.98833 11.5413 )
Epeak [keV] : 68.2811 ( -8.50754 9.3235 )
Norm@50keV : 111.855 ( -113.973 324.107 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.15 using 59 PHA bins.
# Reduced chi-squared = 1.128 for 56 degrees of freedom
# Null hypothesis probability = 2.383935e-01
Photon flux (15-150 keV) in 1 sec: 0.865979 0.858354 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.43173e-15 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.200 sec. to 0.800 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -4.24962 -5 )
beta : -9.37167 ( 9.37167 19.3643 )
Epeak [keV] : 71.4405 ( -11.9873 12.5609 )
Norm@50keV : 2.23429 ( -0.699149 4.86395 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.08 using 59 PHA bins.
# Reduced chi-squared = 1.183 for 55 degrees of freedom
# Null hypothesis probability = 1.659266e-01
Photon flux (15-150 keV) in 1 sec: 0.977381 ( ) 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] : 19.1722 (-4.45351 6.57563)
R^2/D10^2 : 7.22431E-02 (-0.0733397 0.113174)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.12 using 59 PHA bins.
# Reduced chi-squared = 1.178 for 57 degrees of freedom
# Null hypothesis probability = 1.688640e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.692e-08 1.133e-08
25- 50 1.105e-08 7.940e-09
50-150 4.493e-10 5.540e-10
15-150 2.842e-08 2.053e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.352 (-199.362 -199.362)
Norm : 5.52684 (-1.9254 2.35446)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 70.02 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.153170e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.376e-08 8.550e-09
25- 50 2.647e-08 1.660e-08
50-150 5.806e-08 3.598e-08
15-150 9.830e-08 5.830e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.41188 (-1.99187 2.96236)
R1^2/D10^2 : 268.917 (-276.339 -277.094)
kT2 [keV] : 20.1742 (-4.8548 7.7235)
R2^2/D10^2 : 5.74760E-02 (-0.0400144 0.0747166)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.864616e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.581e-08 9.770e-09
25- 50 2.323e-08 1.399e-08
50-150 6.801e-08 4.479e-08
15-150 1.070e-07 6.335e-08
Plot creation:
Wed Mar 20 21:35:59 EDT 2019