batgrbproduct analysis for trigger=900730
batgrbproduct Analysis for Trigger=900730
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 Apr 28 09:37:13 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger900730/GCN5_download_cron
======================================================================
Trigger: 00900730 Segment: 000
BAT Trigger Time: 578032477.88 [s; MET]
Trigger Stop: 578032477.912 [s; MET]
UTC: 2019-04-27T04:34:15.072360 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.212789126915 Dec: 40.3223823960134 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 11.1
Image Trigger?: NO
Rate S/N Ratio: 54.5435605731786 [ if not an image trigger ]
Image S/N Ratio: 11.1
Flight Position: [ source = BAT ]
RA: 280.212789126915 Dec: 40.3223823960134 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.22892837142 Dec: 40.3206212595005 [deg; J2000]
{ 18h 40m 54.9s , +40d 19' 14.2" }
+/- 1.8070619519077 [arcmin] (estimated 90% radius based on SNR)
+/- 0.647713846260355 [arcmin] (formal 1-sigma fit error)
SNR: 13.0621309859248
Angular difference between Flight and Ground position is 0.745822 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 0.191999912261963 +/- 0.202385803424389
Measured from: -0.0159999132156372
to: 0.175999999046326 [s; relative to TRIGTIME]
T50: 0.0639998912811279 +/- 0.0640000104904175
Measured from: -0.0159999132156372
to: 0.0479999780654907 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.324000000953674
to: 0.675999999046326 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.0160000324249268
to: 0.304000020027161 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.036595 0.071493 0.060973 0.024166
0.006702 0.007908 0.007736 0.005797 [error]
Peak 0.042228 0.073095 0.062155 0.017771
0.010100 0.010950 0.009988 0.008049 [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 1.21e-08 2.71e-08 4.78e-08 1.97e-07 1.30e-07 2.84e-07 erg/cm2
Error 2.67e-09 3.59e-09 7.09e-09 6.51e-08 1.80e-08 7.03e-08 erg/cm2
Peak flux Power-law 4.21e-01 5.10e-01 4.48e-01 6.77e-01 1.62e+00 2.06e+00 ph/cm2/s
Error 1.32e-01 9.39e-02 8.19e-02 2.79e-01 2.55e-01 3.42e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-08 2.73e-08 4.82e-08 1.73e-07 1.30e-07 2.58e-07 erg/cm2
Error 3.05e-09 3.96e-09 7.76e-09 1.10e-07 1.89e-08 9.73e-08 erg/cm2
Peak flux Cutoff-PL 4.31e-01 5.15e-01 4.45e-01 6.53e-01 1.62e+00 2.04e+00 ph/cm2/s
Error 1.32e-01 9.42e-02 8.22e-02 3.33e-01 2.55e-01 3.66e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- 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 1.183 0.209 - - 4.00e-02 4.80e-03 43.440 57
CPL 1.097 0.563 527.5 0.0 4.39e-02 3.65e-02 43.410 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.187 0.294 - - 1.38e-02 2.11e-03 49.340 57
CPL 1.196 0.337 9999.4 0.0 1.39e-02 7.01e-03 49.360 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.320 -0.016 0.304
T90 0.192 -0.016 0.176
T50 0.064 -0.016 0.048
Peak 1.000 -0.324 0.676
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.2289 +40.3206 0.0147 24.6 148.5 0.1887 13.1 TRIG_00900730
------------------------------------------
Foreground time interval of the image:
-0.016 0.304 (delta_t = 0.320 [sec])
Background time interval of the image:
-60.880 -0.016 (delta_t = 60.864 [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 -0.016 sec. to 0.304 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18253 ( -0.209934 0.209008 )
Norm@50keV : 3.99562E-02 ( -0.00480304 0.00479514 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.44 using 59 PHA bins.
# Reduced chi-squared = 0.7620 for 57 degrees of freedom
# Null hypothesis probability = 9.072656e-01
Photon flux (15-150 keV) in 0.32 sec: 4.67884 ( -0.566744 0.567287 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.30368e-07 ( -1.79117e-08 1.80925e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.016 sec. to 0.304 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09693 ( -0.836859 0.288432 )
Epeak [keV] : 527.500 ( -580.336 -580.336 )
Norm@50keV : 4.39402E-02 ( -0.00826291 0.064734 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.41 using 59 PHA bins.
# Reduced chi-squared = 0.7752 for 56 degrees of freedom
# Null hypothesis probability = 8.903306e-01
Photon flux (15-150 keV) in 0.32 sec: 4.66527 ( -0.57851 0.57382 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.29785e-07 ( -1.91811e-08 1.85309e-08 ) ergs/cm2
Band function
Time interval is from -0.016 sec. to 0.304 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.738562 ( 0.739907 4.05844 )
beta : -1.26667 ( 1.26629 0.286487 )
Epeak [keV] : 114.292 ( -108.646 788.36 )
Norm@50keV : 7.17403E-02 ( -0.0383541 2.36252 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 43.26 using 59 PHA bins.
# Reduced chi-squared = 0.7865 for 55 degrees of freedom
# Null hypothesis probability = 8.740960e-01
Photon flux (15-150 keV) in 0.32 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] : 17.7750 (-2.92668 3.82039)
R^2/D10^2 : 0.315364 (-0.147347 0.255814)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.62 using 59 PHA bins.
# Reduced chi-squared = 1.046 for 57 degrees of freedom
# Null hypothesis probability = 3.804705e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.409e-09 1.613e-09
25- 50 2.936e-08 5.960e-09
50-150 6.711e-08 1.637e-08
15-150 1.029e-07 1.859e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-37.0028 -200)
Norm : 18.9648 (-2.3217 2.3217)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.65 using 59 PHA bins.
# Reduced chi-squared = 0.9061 for 57 degrees of freedom
# Null hypothesis probability = 6.754621e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.511e-08 8.530e-09
25- 50 2.906e-08 1.593e-08
50-150 6.374e-08 3.507e-08
15-150 1.079e-07 6.019e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.50890 (-3.81186 4.26266)
R1^2/D10^2 : 1.64642 (-0.992044 4.26727)
kT2 [keV] : 42.8117 (-17.0882 -42.8009)
R2^2/D10^2 : 1.56700E-02 (-0.0133456 0.0329302)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 44.05 using 59 PHA bins.
#Fit statistic : Chi-Squared = 43.20 using 59 PHA bins.
# Reduced chi-squared = 0.8008 for 55 degrees of freedom
# Reduced chi-squared = 0.7854 for 55 degrees of freedom
# Null hypothesis probability = 8.550648e-01
# Null hypothesis probability = 8.754857e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.068e-08 6.352e-09
25- 50 2.782e-08 1.499e-08
50-150 8.451e-08 4.995e-08
15-150 1.230e-07 6.638e-08
Peak spectrum fit
Power-law model
Time interval is from -0.324 sec. to 0.676 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.18710 ( -0.298862 0.289061 )
Norm@50keV : 1.37948E-02 ( -0.00210974 0.00210969 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.34 using 59 PHA bins.
# Reduced chi-squared = 0.8656 for 57 degrees of freedom
# Null hypothesis probability = 7.546011e-01
Photon flux (15-150 keV) in 1 sec: 1.61634 ( -0.25402 0.255012 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40468e-07 ( -2.43661e-08 2.46849e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.324 sec. to 0.676 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.19566 ( -0.393822 0.279346 )
Epeak [keV] : 9999.35 ( -9999.36 -9999.36 )
Norm@50keV : 1.38563E-02 ( -0.00211811 0.0118946 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.36 using 59 PHA bins.
# Reduced chi-squared = 0.8815 for 56 degrees of freedom
# Null hypothesis probability = 7.224510e-01
Photon flux (15-150 keV) in 1 sec: 1.62040 ( -0.25831 0.25071 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.4085e-07 ( -2.4737e-08 2.3525e-08 ) ergs/cm2
Band function
Time interval is from -0.324 sec. to 0.676 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.953341 ( 0.953341 5.93514 )
beta : -1.18709 ( 1.18709 0.298855 )
Epeak [keV] : 52.6593 ( -52.6593 -52.6593 )
Norm@50keV : 2.44430E-02 ( -0.0111249 2.74837 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.34 using 59 PHA bins.
# Reduced chi-squared = 0.8971 for 55 degrees of freedom
# Null hypothesis probability = 6.897370e-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] : 18.4478 (-4.281 6.70556)
R^2/D10^2 : 9.23571E-02 (-0.0915623 0.130321)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.74 using 59 PHA bins.
# Reduced chi-squared = 1.136 for 57 degrees of freedom
# Null hypothesis probability = 2.247918e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.242e-09 2.114e-09
25- 50 2.940e-08 8.570e-09
50-150 7.306e-08 2.112e-08
15-150 1.087e-07 3.008e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 (-54.889 -200)
Norm : 6.63650 (-1.03951 1.03951)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 54.67 using 59 PHA bins.
# Reduced chi-squared = 0.9590 for 57 degrees of freedom
# Null hypothesis probability = 5.631625e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.653e-08 9.395e-09
25- 50 3.180e-08 1.789e-08
50-150 6.975e-08 3.986e-08
15-150 1.181e-07 6.675e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.73417 (-4.28815 4.21789)
R1^2/D10^2 : 0.593987 (-0.329007 2.57978)
kT2 [keV] : 87.1470 (-57.3 -87.7275)
R2^2/D10^2 : 1.19023E-03 (-0.000719093 0.0152435)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.45 using 59 PHA bins.
#Fit statistic : Chi-Squared = 48.79 using 59 PHA bins.
# Reduced chi-squared = 0.8991 for 55 degrees of freedom
# Reduced chi-squared = 0.8871 for 55 degrees of freedom
# Null hypothesis probability = 6.857798e-01
# Null hypothesis probability = 7.093704e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.263e-08 7.535e-09
25- 50 2.993e-08 1.683e-08
50-150 9.760e-08 5.790e-08
15-150 1.402e-07 7.635e-08
Plot creation:
Sun Apr 28 09:40:08 EDT 2019