batgrbproduct analysis for trigger=927839
batgrbproduct Analysis for Trigger=927839
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): Sat Oct 5 23:42:29 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger927839/GCN5_download_cron
======================================================================
Trigger: 00927839 Segment: 000
BAT Trigger Time: 591917645.376 [s; MET]
Trigger Stop: 591917645.888 [s; MET]
UTC: 2019-10-04T21:33:41.682300 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 49.1767831678255 Dec: -39.6131376723519 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.55
Image Trigger?: NO
Rate S/N Ratio: 18.5202591774521 [ if not an image trigger ]
Image S/N Ratio: 9.55
Flight Position: [ source = BAT ]
RA: 49.1767831678255 Dec: -39.6131376723519 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 49.2005958914706 Dec: -39.6369714698467 [deg; J2000]
{ 03h 16m 48.1s , -39d 38' 13.1" }
+/- 0.636734349081166 [arcmin] (estimated 90% radius based on SNR)
+/- 0.151365204303305 [arcmin] (formal 1-sigma fit error)
SNR: 57.9666205376331
Angular difference between Flight and Ground position is 1.804451 arcmin
Partial Coding Fraction: 0.9765625 [ including projection effects ]
Duration
T90: 317.567999958992 +/- 70.0838163929186
Measured from: 1.12800002098083
to: 318.695999979973 [s; relative to TRIGTIME]
T50: 31.8880000114441 +/- 27.7426026271054
Measured from: 3.77600002288818
to: 35.6640000343323 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 2.74799990653992
to: 3.74799990653992 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.17200005054474
to: 388.735999941826 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.071230 1.335710 1.522691 0.421000
0.113230 0.119073 0.109940 0.109439 [error]
Peak 0.132983 0.237805 0.224230 0.055639
0.008050 0.009911 0.009865 0.007214 [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 2.52e-07 5.94e-07 1.11e-06 5.02e-06 3.01e-06 6.98e-06 erg/cm2
Error 4.09e-08 5.58e-08 1.06e-07 1.12e-06 2.73e-07 1.18e-06 erg/cm2
Peak flux Power-law 1.24e+00 1.56e+00 1.43e+00 2.28e+00 5.00e+00 6.50e+00 ph/cm2/s
Error 1.08e-01 8.30e-02 7.66e-02 2.59e-01 2.33e-01 3.31e-01 ph/cm2/s
Fluence Cutoff-PL 2.43e-07 6.02e-07 1.13e-06 3.91e-06 2.98e-06 5.89e-06 erg/cm2
Error 5.00e-08 6.13e-08 1.18e-07 2.24e-06 2.98e-07 1.76e-06 erg/cm2
Peak flux Cutoff-PL 1.14e+00 1.60e+00 1.49e+00 1.55e+00 4.93e+00 5.77e+00 ph/cm2/s
Error 1.33e-01 9.26e-02 9.21e-02 4.96e-01 2.39e-01 5.43e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 1.07e+00 1.67e+00 1.43e+00 2.02e+00 4.91e+00 6.21e+00 ph/cm2/s
Error 1.58e-01 1.15e-01 7.93e-02 -------- -------- 3.82e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.096 0.149 - - 7.39e-04 5.88e-05 54.970 57
CPL 0.925 0.463 346.8 0.0 8.85e-04 4.90e-04 54.700 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.128 0.079 - - 4.30e-02 1.97e-03 65.780 57
CPL 0.759 0.314 184.4 282.8 6.40e-02 2.17e-02 61.390 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: 6.976000 sec.
T50 in the 50-300 keV band: 3.136000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 389.908 -1.172 388.736
T90 317.568 1.128 318.696
T50 31.888 3.776 35.664
Peak 1.000 2.748 3.748
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
49.2006 -39.6370 0.0033 14.0 -133.0 3.1773 58.0 TRIG_00927839
------------------------------------------
Foreground time interval of the image:
-1.172 8.525 (delta_t = 9.697 [sec])
Background time interval of the image:
-239.376 -57.076 (delta_t = 182.300 [sec])
-51.376 -1.172 (delta_t = 50.204 [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 -1.172 sec. to 388.736 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09638 ( -0.149668 0.14738 )
Norm@50keV : 7.38678E-04 ( -5.87773e-05 5.87496e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.97 using 59 PHA bins.
# Reduced chi-squared = 0.9644 for 57 degrees of freedom
# Null hypothesis probability = 5.516376e-01
Photon flux (15-150 keV) in 389.9 sec: 8.56518E-02 ( -0.00697392 0.00699049 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.01474e-06 ( -2.71557e-07 2.7394e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.172 sec. to 388.736 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.924925 ( -0.624067 0.301369 )
Epeak [keV] : 346.772 ( -346.772 -346.772 )
Norm@50keV : 8.85422E-04 ( -0.000197504 0.000782421 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9768 for 56 degrees of freedom
# Null hypothesis probability = 5.242305e-01
Photon flux (15-150 keV) in 389.9 sec: 8.48503E-02 ( -0.0074556 0.0074202 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.97934e-06 ( -3.00453e-07 2.96032e-07 ) ergs/cm2
Band function
Time interval is from -1.172 sec. to 388.736 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.943348 ( 0.845392 0.845392 )
beta : -2.91907 ( 8.32972 18.2345 )
Epeak [keV] : 388.156 ( -199.368 -388.238 )
Norm@50keV : 8.66942E-04 ( -0.000137219 0.000304288 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.70 using 59 PHA bins.
# Reduced chi-squared = 0.9946 for 55 degrees of freedom
# Null hypothesis probability = 4.859072e-01
Photon flux (15-150 keV) in 389.9 sec: 0.471219 ( ) 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] : 20.4350 (-2.19257 2.57159)
R^2/D10^2 : 3.70692E-03 (-0.00115807 0.00162827)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 79.08 using 59 PHA bins.
# Reduced chi-squared = 1.387 for 57 degrees of freedom
# Null hypothesis probability = 2.812273e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.153e-07 2.047e-08
25- 50 5.827e-07 8.051e-08
50-150 1.809e-06 2.790e-07
15-150 2.507e-06 2.749e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-17.0746 -200)
Norm : 0.350033 (-0.0286722 0.0286722)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 80.32 using 59 PHA bins.
# Reduced chi-squared = 1.409 for 57 degrees of freedom
# Null hypothesis probability = 2.261596e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.399e-07 4.400e-08
25- 50 6.539e-07 2.053e-07
50-150 1.434e-06 6.554e-07
15-150 2.428e-06 6.893e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.82433 (-2.45395 4.17597)
R1^2/D10^2 : 0.111902 (-0.090486 1.05324)
kT2 [keV] : 27.1209 (-5.03565 13.5812)
R2^2/D10^2 : 1.37745E-03 (-0.00100586 0.00112669)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.84 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.430094e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.538e-07 1.209e-07
25- 50 5.631e-07 1.867e-07
50-150 2.093e-06 5.186e-07
15-150 2.910e-06 6.622e-07
Peak spectrum fit
Power-law model
Time interval is from 2.748 sec. to 3.748 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.12783 ( -0.0792878 0.0791123 )
Norm@50keV : 4.29999E-02 ( -0.00197492 0.00197489 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 65.78 using 59 PHA bins.
# Reduced chi-squared = 1.154 for 57 degrees of freedom
# Null hypothesis probability = 1.989847e-01
Photon flux (15-150 keV) in 1 sec: 5.00200 ( -0.232927 0.233041 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.45712e-07 ( -2.33597e-08 2.33493e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 2.748 sec. to 3.748 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.759129 ( -0.324928 0.303026 )
Epeak [keV] : 184.384 ( -61.7344 503.766 )
Norm@50keV : 6.40460E-02 ( -0.0174706 0.0259253 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.39 using 59 PHA bins.
# Reduced chi-squared = 1.096 for 56 degrees of freedom
# Null hypothesis probability = 2.890983e-01
Photon flux (15-150 keV) in 1 sec: 4.93351 ( -0.23948 0.23941 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.36812e-07 ( -2.4926e-08 2.4805e-08 ) ergs/cm2
Band function
Time interval is from 2.748 sec. to 3.748 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.759116 ( -0.101217 0.119747 )
beta : -10.0000 ( 10 20 )
Epeak [keV] : 184.358 ( -48.6065 500.076 )
Norm@50keV : 6.40433E-02 ( -0.0174927 0.0259388 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 61.39 using 59 PHA bins.
# Reduced chi-squared = 1.116 for 55 degrees of freedom
# Null hypothesis probability = 2.579088e-01
Photon flux (15-150 keV) in 1 sec: 4.90525 ( ) 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] : 19.5281 ( )
R^2/D10^2 : 0.255967 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 141.15 using 59 PHA bins.
# Reduced chi-squared = 2.4763 for 57 degrees of freedom
# Null hypothesis probability = 4.339452e-09
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.899e-08 1.770e-09
25- 50 9.310e-08 6.545e-09
50-150 2.622e-07 2.200e-08
15-150 3.743e-07 2.140e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 20.2212 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 136.45 using 59 PHA bins.
# Reduced chi-squared = 2.3938 for 57 degrees of freedom
# Null hypothesis probability = 1.830783e-08
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.035e-08 2.500e-09
25- 50 9.686e-08 5.075e-09
50-150 2.124e-07 1.265e-08
15-150 3.596e-07 3.700e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.41010 (-1.3452 1.53627)
R1^2/D10^2 : 2.15072 (-0.823148 1.50674)
kT2 [keV] : 32.6472 (-4.74746 7.6636)
R2^2/D10^2 : 4.03606E-02 (-0.0198151 0.0282071)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.80 using 59 PHA bins.
# Reduced chi-squared = 1.033 for 55 degrees of freedom
# Null hypothesis probability = 4.077465e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.486e-08 7.855e-09
25- 50 9.494e-08 1.431e-08
50-150 3.116e-07 6.915e-08
15-150 4.414e-07 8.215e-08
Plot creation:
Sat Oct 5 23:46:36 EDT 2019