batgrbproduct analysis for trigger=899979
batgrbproduct Analysis for Trigger=899979
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): Tue Apr 23 21:09:17 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger899979/GCN5_download_cron
======================================================================
Trigger: 00899979 Segment: 000
BAT Trigger Time: 577666552 [s; MET]
Trigger Stop: 577666656 [s; MET]
UTC: 2019-04-22T22:55:29.215560 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 182.124237954621 Dec: -60.2379723458902 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.54
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 10.54
Flight Position: [ source = BAT ]
RA: 182.124237954621 Dec: -60.2379723458902 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 182.12607657604 Dec: -60.1673756604565 [deg; J2000]
{ 12h 08m 30.3s , -60d 10' 02.6" }
+/- 2.41075148339966 [arcmin] (estimated 90% radius based on SNR)
+/- 1.25674778773826 [arcmin] (formal 1-sigma fit error)
SNR: 8.6533908297234
Angular difference between Flight and Ground position is 4.236156 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 263.231999874115 +/- 54.9702775769705
Measured from: 17.8960001468658
to: 281.128000020981 [s; relative to TRIGTIME]
T50: 87.7680000066757 +/- 23.5040535390637
Measured from: 105.624000072479
to: 193.392000079155 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 174.472000002861
to: 175.472000002861 [s; relative to TRIGTIME]
Total Fluence
Measured from: 6.38800001144409
to: 359.483999967575 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.981166 4.444711 2.678438 0.666195
0.147556 0.151834 0.131383 0.115092 [error]
Peak 0.094363 0.122516 0.089510 0.026144
0.009715 0.010632 0.009507 0.007451 [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 1.15e-06 1.80e-06 2.12e-06 4.84e-06 6.48e-06 9.90e-06 erg/cm2
Error 8.58e-08 7.76e-08 1.33e-07 6.65e-07 3.04e-07 7.63e-07 erg/cm2
Peak flux Power-law 8.81e-01 8.63e-01 5.92e-01 6.38e-01 2.59e+00 2.97e+00 ph/cm2/s
Error 1.39e-01 8.39e-02 7.74e-02 1.70e-01 2.44e-01 2.89e-01 ph/cm2/s
Fluence Cutoff-PL 1.16e-06 1.80e-06 2.12e-06 4.45e-06 6.45e-06 9.51e-06 erg/cm2
Error 9.03e-08 7.97e-08 1.38e-07 -------- 3.29e-07 1.11e-06 erg/cm2
Peak flux Cutoff-PL 8.60e-01 8.76e-01 5.98e-01 5.33e-01 2.58e+00 2.87e+00 ph/cm2/s
Error 1.59e-01 9.75e-02 8.27e-02 -------- 2.54e-01 3.89e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 8.41e-01 8.84e-01 6.04e-01 4.70e-01 2.57e+00 2.80e+00 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 1.763 0.084 - - 1.99e-03 8.97e-05 34.520 57
CPL 1.751 0.318 970.5 0.0 2.02e-03 0.00e+00 34.560 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.545 0.171 - - 2.05e-02 2.06e-03 48.530 57
CPL 1.405 0.707 208.1 0.0 2.42e-02 1.77e-02 48.370 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: 61.312000 sec.
T50 in the 50-300 keV band: 19.840000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 353.096 6.388 359.484
T90 263.232 17.896 281.128
T50 87.768 105.624 193.392
Peak 1.000 174.472 175.472
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
182.1261 -60.1674 0.0221 15.9 132.8 10.8507 8.7 TRIG_00899979
------------------------------------------
Foreground time interval of the image:
6.388 359.484 (delta_t = 353.096 [sec])
Background time interval of the image:
-10.799 6.388 (delta_t = 17.187 [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 6.388 sec. to 359.484 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.76284 ( -0.0837513 0.084603 )
Norm@50keV : 1.98892E-03 ( -9.00223e-05 8.94664e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.52 using 59 PHA bins.
# Reduced chi-squared = 0.6056 for 57 degrees of freedom
# Null hypothesis probability = 9.919486e-01
Photon flux (15-150 keV) in 353.1 sec: 0.270221 ( -0.0118836 0.0119278 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.47571e-06 ( -3.03029e-07 3.04907e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.388 sec. to 359.484 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.75055 ( -0.256995 0.378024 )
Epeak [keV] : 970.550 ( )
Norm@50keV : 2.01846E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 34.56 using 59 PHA bins.
# Reduced chi-squared = 0.6172 for 56 degrees of freedom
# Null hypothesis probability = 9.892242e-01
Photon flux (15-150 keV) in 353.1 sec: 0.270217 ( -0.012013 0.011796 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.44676e-06 ( -3.18143e-07 3.39435e-07 ) ergs/cm2
Band function
Time interval is from 6.388 sec. to 359.484 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.17895 ( 1.17174 5.84564 )
beta : -1.79751 ( 1.79785 0.109075 )
Epeak [keV] : 42.0558 ( -41.5397 88.9988 )
Norm@50keV : 4.91891E-03 ( -0.00317613 0 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 33.92 using 59 PHA bins.
# Reduced chi-squared = 0.6168 for 55 degrees of freedom
# Null hypothesis probability = 9.886747e-01
Photon flux (15-150 keV) in 353.1 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] : 12.4005 ( )
R^2/D10^2 : 5.42559E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 181.91 using 59 PHA bins.
# Reduced chi-squared = 3.1913 for 57 degrees of freedom
# Null hypothesis probability = 5.779943e-15
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.244e-07 5.402e-08
25- 50 2.041e-06 9.604e-08
50-150 1.928e-06 2.046e-07
15-150 4.593e-06 2.348e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 120.868 (-22.3391 28.7273)
Norm : 1.12509 (-0.0647554 0.0764578)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.56 using 59 PHA bins.
# Reduced chi-squared = 0.7292 for 57 degrees of freedom
# Null hypothesis probability = 9.379572e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.034e-06 7.945e-08
25- 50 1.853e-06 1.123e-07
50-150 3.319e-06 8.905e-07
15-150 6.206e-06 9.728e-07
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.87397 (-0.837781 0.879902)
R1^2/D10^2 : 0.360196 (-0.124101 0.217009)
kT2 [keV] : 27.8759 (-4.66159 7.34362)
R2^2/D10^2 : 2.23185E-03 (-0.00120766 0.00207836)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.63 using 59 PHA bins.
#Fit statistic : Chi-Squared = 37.24 using 59 PHA bins.
# Reduced chi-squared = 0.8842 for 55 degrees of freedom
# Reduced chi-squared = 0.6771 for 55 degrees of freedom
# Null hypothesis probability = 7.149445e-01
# Null hypothesis probability = 9.681864e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.055e-06 4.050e-07
25- 50 1.680e-06 4.472e-07
50-150 3.064e-06 7.078e-07
15-150 5.799e-06 1.319e-06
Peak spectrum fit
Power-law model
Time interval is from 174.472 sec. to 175.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54458 ( -0.168946 0.172487 )
Norm@50keV : 2.05015E-02 ( -0.00206964 0.00204501 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.53 using 59 PHA bins.
# Reduced chi-squared = 0.8513 for 57 degrees of freedom
# Null hypothesis probability = 7.803921e-01
Photon flux (15-150 keV) in 1 sec: 2.59131 ( -0.24436 0.244531 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.93154e-07 ( -2.13967e-08 2.16798e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 174.472 sec. to 175.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.40451 ( -0.684312 0.730309 )
Epeak [keV] : 208.079 ( -208.057 -208.057 )
Norm@50keV : 2.42255E-02 ( -0.00605079 0.0293976 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.37 using 59 PHA bins.
# Reduced chi-squared = 0.8638 for 56 degrees of freedom
# Null hypothesis probability = 7.556238e-01
Photon flux (15-150 keV) in 1 sec: 2.57506 ( -0.25431 0.25312 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.90985e-07 ( -1.199e-08 2.3276e-08 ) ergs/cm2
Band function
Time interval is from 174.472 sec. to 175.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.37079 ( -0.245731 0.572629 )
beta : -9.34877 ( 9.36848 19.3685 )
Epeak [keV] : 179.965 ( -94.5405 -180.521 )
Norm@50keV : 2.51591E-02 ( -0.0104987 0.0465784 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.38 using 59 PHA bins.
# Reduced chi-squared = 0.8797 for 55 degrees of freedom
# Null hypothesis probability = 7.237099e-01
Photon flux (15-150 keV) in 1 sec: 2.56553 ( ) 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] : 14.2708 (-1.72599 2.00853)
R^2/D10^2 : 0.343196 (-0.126274 0.196378)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 76.47 using 59 PHA bins.
# Reduced chi-squared = 1.342 for 57 degrees of freedom
# Null hypothesis probability = 4.357708e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.473e-08 2.720e-09
25- 50 5.585e-08 7.690e-09
50-150 7.561e-08 1.579e-08
15-150 1.462e-07 1.820e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-74.554 -199.363)
Norm : 10.5441 (-0.985823 0.986185)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.60 using 59 PHA bins.
# Reduced chi-squared = 0.8526 for 57 degrees of freedom
# Null hypothesis probability = 7.781413e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.626e-08 1.417e-08
25- 50 5.051e-08 1.524e-08
50-150 1.108e-07 5.191e-08
15-150 1.875e-07 7.878e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 4.71696 (-1.58538 2.61472)
R1^2/D10^2 : 11.0986 (-8.83531 63.7683)
kT2 [keV] : 20.7271 (-3.95142 8.08301)
R2^2/D10^2 : 8.10082E-02 (-0.0569723 0.0949908)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.55 using 59 PHA bins.
# Reduced chi-squared = 0.9008 for 55 degrees of freedom
# Null hypothesis probability = 6.823019e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.786e-08 1.297e-08
25- 50 4.569e-08 1.431e-08
50-150 1.082e-07 3.279e-08
15-150 1.817e-07 4.872e-08
Plot creation:
Tue Apr 23 21:12:54 EDT 2019