batgrbproduct analysis for trigger=895006
batgrbproduct Analysis for Trigger=895006
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 27 16:59:55 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger895006/GCN5_download_cron
======================================================================
Trigger: 00895006 Segment: 000
BAT Trigger Time: 575278551.544 [s; MET]
Trigger Stop: 575278551.576 [s; MET]
UTC: 2019-03-26T07:35:28.910940 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 341.652491920313 Dec: 39.9026483879093 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.57
Image Trigger?: NO
Rate S/N Ratio: 44.8330235429198 [ if not an image trigger ]
Image S/N Ratio: 10.57
Flight Position: [ source = BAT ]
RA: 341.652491920313 Dec: 39.9026483879093 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 341.65232112937 Dec: 39.9139746169642 [deg; J2000]
{ 22h 46m 36.6s , +39d 54' 50.3" }
+/- 1.56187306291838 [arcmin] (estimated 90% radius based on SNR)
+/- 0.588479530824784 [arcmin] (formal 1-sigma fit error)
SNR: 16.0872427769131
Angular difference between Flight and Ground position is 0.679619 arcmin
Partial Coding Fraction: 0.578125 [ including projection effects ]
Duration
T90: 0.0759999752044678 +/- 0.0322489854521138
Measured from: 1.19209289550781e-07
to: 0.0760000944137573 [s; relative to TRIGTIME]
T50: 0.0279998779296875 +/- 0.00894431669225064
Measured from: 0.00800013542175293
to: 0.0360000133514404 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.445999979972839
to: 0.554000020027161 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.103999972343445 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.056003 0.068018 0.040191 0.007765
0.006425 0.007049 0.005885 0.004059 [error]
Peak 0.053406 0.075049 0.046614 -0.002167
0.011336 0.011816 0.010717 0.009133 [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 1.85e-08 1.05e-08 3.80e-09 1.80e-09 3.38e-08 3.47e-08 erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Power-law 6.60e-01 5.42e-01 3.02e-01 2.48e-01 1.61e+00 1.75e+00 ph/cm2/s
Error 1.68e-01 9.96e-02 8.10e-02 1.24e-01 2.97e-01 3.26e-01 ph/cm2/s
Fluence Cutoff-PL 1.72e-08 3.13e-08 1.36e-08 7.31e-10 6.28e-08 6.28e-08 erg/cm2
Error 3.73e-09 4.56e-09 3.85e-09 5.40e-10 8.20e-09 8.21e-09 erg/cm2
Peak flux Cutoff-PL 5.44e-01 6.81e-01 2.92e-01 3.06e-02 1.55e+00 1.55e+00 ph/cm2/s
Error 1.93e-01 1.42e-01 1.10e-01 6.38e-02 2.97e-01 3.00e-01 ph/cm2/s
Fluence Band 1.70e-08 3.12e-08 1.35e-08 7.57e-10 6.26e-08 6.27e-08 erg/cm2
Error 3.69e-09 -------- 3.83e-09 5.33e-10 8.15e-09 8.21e-09 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 3.472 0.000 - - 2.10e-02 0.00e+00 167.120 57
CPL -0.666 0.924 33.9 4.9 4.66e+00 8.64e+00 97.470 56
The chi2 of BB fit is 99.89 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 1.844 0.296 - - 1.15e-02 2.44e-03 69.740 57
CPL -0.208 1.717 44.7 13.4 1.76e-01 1.29e+00 63.110 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: 0.128000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.104 0.000 0.104
T90 0.076 0.000 0.076
T50 0.028 0.008 0.036
Peak 1.000 -0.446 0.554
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
341.6523 +39.9140 0.0120 39.6 -14.6 0.1786 16.1 TRIG_00895006
------------------------------------------
Foreground time interval of the image:
0.000 0.104 (delta_t = 0.104 [sec])
Background time interval of the image:
-239.544 0.000 (delta_t = 239.544 [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 0.000 sec. to 0.104 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.47169 ( )
Norm@50keV : 2.10326E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 167.12 using 59 PHA bins.
# Reduced chi-squared = 2.9319 for 57 degrees of freedom
# Null hypothesis probability = 9.469968e-13
Photon flux (15-150 keV) in 0.104 sec: 8.31619 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 3.38217e-08 ( 0 0 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.104 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.665997 ( -1.00838 0.838884 )
Epeak [keV] : 33.8598 ( -5.24384 4.46041 )
Norm@50keV : 4.66285 ( -4.66173 12.6268 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.47 using 59 PHA bins.
# Reduced chi-squared = 1.741 for 56 degrees of freedom
# Null hypothesis probability = 5.007513e-04
Photon flux (15-150 keV) in 0.104 sec: 12.0296 ( -1.5746 1.5718 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.27873e-08 ( -8.19998e-09 8.20498e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.104 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.688644 ( -0.856025 0.998726 )
beta : -8.74164 ( 8.65837 2.58732 )
Epeak [keV] : 33.9046 ( -4.80646 4.43672 )
Norm@50keV : 4.80183 ( -4.80416 12.8205 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 97.42 using 59 PHA bins.
# Reduced chi-squared = 1.771 for 55 degrees of freedom
# Null hypothesis probability = 3.709865e-04
Photon flux (15-150 keV) in 0.104 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.26485e-08 ( -6.26477e-08 -8.16972e-09 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 9.38793 (-1.1395 1.03458)
R^2/D10^2 : 8.01489 (-2.83072 5.37939)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 99.89 using 59 PHA bins.
# Reduced chi-squared = 1.753 for 57 degrees of freedom
# Null hypothesis probability = 3.857999e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.460e-08 2.995e-09
25- 50 3.310e-08 5.476e-09
50-150 1.434e-08 4.409e-09
15-150 6.204e-08 1.018e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 26.0022 ( )
Norm : 110.079 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 115.26 using 59 PHA bins.
# Reduced chi-squared = 2.0221 for 57 degrees of freedom
# Null hypothesis probability = 7.955351e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.149e-08 3.177e-09
25- 50 2.259e-08 3.167e-09
50-150 1.017e-08 2.747e-09
15-150 5.425e-08 7.644e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.31856 (-1.83724 2.37819)
R1^2/D10^2 : 58.3185 (-49.2599 569.321)
kT2 [keV] : 10.5140 (-1.28752 1.17564)
R2^2/D10^2 : 4.21035 (-2.17689 3.45332)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 95.01 using 59 PHA bins.
# Reduced chi-squared = 1.727 for 55 degrees of freedom
# Null hypothesis probability = 6.546224e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.791e-08 9.236e-09
25- 50 3.020e-08 1.508e-08
50-150 1.613e-08 8.439e-09
15-150 6.424e-08 3.335e-08
Peak spectrum fit
Power-law model
Time interval is from -0.446 sec. to 0.554 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84379 ( -0.286951 0.305613 )
Norm@50keV : 1.15099E-02 ( -0.00246483 0.0024182 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 69.74 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.197757e-01
Photon flux (15-150 keV) in 1 sec: 1.61381 ( -0.296932 0.297144 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05815e-07 ( -2.23021e-08 2.29687e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.446 sec. to 0.554 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.207751 ( -1.99249 1.44241 )
Epeak [keV] : 44.7320 ( -9.29018 17.4222 )
Norm@50keV : 0.175985 ( -0.176109 2.40187 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.11 using 59 PHA bins.
# Reduced chi-squared = 1.127 for 56 degrees of freedom
# Null hypothesis probability = 2.395557e-01
Photon flux (15-150 keV) in 1 sec: 1.54509 ( -0.29542 0.2977 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.17793e-08 ( -2.03662e-08 2.32787e-08 ) ergs/cm2
Band function
Time interval is from -0.446 sec. to 0.554 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98649 ( -6.07707 -4.98649 )
beta : -2.37161 ( -0.769846 0.466403 )
Epeak [keV] : 28.6472 ( -5.77256 5.37938 )
Norm@50keV : 777.046 ( -136.795 2486.68 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.63 using 59 PHA bins.
# Reduced chi-squared = 1.139 for 55 degrees of freedom
# Null hypothesis probability = 2.239555e-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] : 11.0672 (-1.94542 2.33069)
R^2/D10^2 : 0.562452 (-0.290003 0.597925)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.56 using 59 PHA bins.
# Reduced chi-squared = 1.133 for 57 degrees of freedom
# Null hypothesis probability = 2.293225e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.441e-08 4.636e-09
25- 50 4.107e-08 1.165e-08
50-150 2.855e-08 1.155e-08
15-150 8.403e-08 2.297e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.3022 (-31.1158 76.1846)
Norm : 7.85351 (-1.81274 2.31665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.10 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 57 degrees of freedom
# Null hypothesis probability = 1.913815e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.035e-08 5.635e-09
25- 50 3.332e-08 9.930e-09
50-150 4.636e-08 3.311e-08
15-150 1.000e-07 3.493e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.86597 (-5.86017 -5.86017)
R1^2/D10^2 : 2.43967 (-2.44761 -2.44761)
kT2 [keV] : 14.1773 (-14.1692 -14.1692)
R2^2/D10^2 : 0.170842 (-0.171352 0.642921)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.57 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 55 degrees of freedom
# Null hypothesis probability = 2.253896e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.803e-08 1.015e-08
25- 50 3.752e-08 2.005e-08
50-150 3.719e-08 2.182e-08
15-150 9.275e-08 4.764e-08
Plot creation:
Wed Mar 27 17:06:08 EDT 2019