batgrbproduct analysis for trigger=903845
batgrbproduct Analysis for Trigger=903845
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): Thu May 16 14:20:26 EDT 2019
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger903845/GCN5_download_cron
======================================================================
Trigger: 00903845 Segment: 000
BAT Trigger Time: 579629084.224 [s; MET]
Trigger Stop: 579629086.272 [s; MET]
UTC: 2019-05-15T16:04:21.314940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 98.8398449449947 Dec: 52.2947102013463 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.98
Image Trigger?: NO
Rate S/N Ratio: 7.41619848709566 [ if not an image trigger ]
Image S/N Ratio: 9.98
Flight Position: [ source = BAT ]
RA: 98.8398449449947 Dec: 52.2947102013463 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 98.8261593522175 Dec: 52.3215631995887 [deg; J2000]
{ 06h 35m 18.3s , +52d 19' 17.6" }
+/- 1.50740972909217 [arcmin] (estimated 90% radius based on SNR)
+/- 0.652936760412278 [arcmin] (formal 1-sigma fit error)
SNR: 16.9239688454694
Angular difference between Flight and Ground position is 1.687590 arcmin
Partial Coding Fraction: 0.6796875 [ including projection effects ]
Duration
T90: 46.4160000085831 +/- 12.2547910006235
Measured from: -20.3919998407364
to: 26.0240001678467 [s; relative to TRIGTIME]
T50: 14.3520001173019 +/- 2.74911471109577
Measured from: -4.31199991703033
to: 10.0400002002716 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.388000011444092
to: 0.611999988555908 [s; relative to TRIGTIME]
Total Fluence
Measured from: -30.8400000333786
to: 31.0160000324249 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.981212 0.973380 0.694192 0.178777
0.070911 0.073024 0.063307 0.053552 [error]
Peak 0.035804 0.068022 0.031143 0.012218
0.009628 0.010355 0.008878 0.007191 [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 2.71e-07 4.31e-07 5.17e-07 1.21e-06 1.57e-06 2.43e-06 erg/cm2
Error 3.47e-08 3.44e-08 6.30e-08 3.08e-07 1.46e-07 3.64e-07 erg/cm2
Peak flux Power-law 3.96e-01 3.79e-01 2.52e-01 2.61e-01 1.13e+00 1.29e+00 ph/cm2/s
Error 1.24e-01 8.01e-02 6.80e-02 1.36e-01 2.35e-01 2.71e-01 ph/cm2/s
Fluence Cutoff-PL 2.72e-07 4.31e-07 5.16e-07 1.19e-06 1.56e-06 2.33e-06 erg/cm2
Error 3.36e-08 3.45e-08 6.31e-08 3.60e-07 1.47e-07 4.84e-07 erg/cm2
Peak flux Cutoff-PL 3.33e-01 4.55e-01 2.60e-01 5.16e-02 1.09e+00 1.10e+00 ph/cm2/s
Error 1.44e-01 1.24e-01 9.48e-02 1.42e-01 2.43e-01 2.66e-01 ph/cm2/s
Fluence Band -------- -------- -------- -------- -------- -------- erg/cm2
Error -------- -------- -------- -------- -------- -------- erg/cm2
Peak flux Band 3.15e-01 4.13e-01 3.21e-01 1.94e-01 1.16e+00 1.25e+00 ph/cm2/s
Error -------- -------- -------- -------- -------- 3.15e-01 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.738 0.149 - - 2.74e-03 2.43e-04 59.290 57
CPL 1.744 0.156 9999.4 -0.0 2.74e-03 1.41e-03 59.310 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.587 0.327 - - 8.85e-03 1.93e-03 51.100 57
CPL 0.008 2.352 55.6 -20.2 6.73e-02 2.05e+00 48.440 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: 21.056000 sec.
T50 in the 50-300 keV band: 9.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 61.856 -30.840 31.016
T90 46.416 -20.392 26.024
T50 14.352 -4.312 10.040
Peak 1.000 -0.388 0.612
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
98.8262 +52.3216 0.0114 25.6 -87.6 2.4236 16.9 TRIG_00903845
------------------------------------------
Foreground time interval of the image:
-30.840 23.777 (delta_t = 54.617 [sec])
Background time interval of the image:
-162.923 -30.840 (delta_t = 132.083 [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 -30.840 sec. to 31.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73790 ( -0.14808 0.150912 )
Norm@50keV : 2.74370E-03 ( -0.000244865 0.000241223 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.29 using 59 PHA bins.
# Reduced chi-squared = 1.040 for 57 degrees of freedom
# Null hypothesis probability = 3.919912e-01
Photon flux (15-150 keV) in 61.86 sec: 0.369353 ( -0.0296764 0.0297171 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.56725e-06 ( -1.44998e-07 1.46616e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -30.840 sec. to 31.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74365 ( -0.165077 0.146948 )
Epeak [keV] : 9999.36 ( -9999.35 -9999.36 )
Norm@50keV : 2.73567E-03 ( -0.00150459 0.0013076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.31 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 56 degrees of freedom
# Null hypothesis probability = 3.559294e-01
Photon flux (15-150 keV) in 61.86 sec: 0.369711 ( -0.030198 0.029341 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.55935e-06 ( -1.37719e-07 1.56561e-07 ) ergs/cm2
Band function
Time interval is from -30.840 sec. to 31.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.95985 ( -4.95985 -4.95985 )
beta : -1.79803 ( -0.187281 0.163097 )
Epeak [keV] : 21.1120 ( -21.112 3.65912 )
Norm@50keV : 981.051 ( -77.4473 2.00903e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 57.68 using 59 PHA bins.
# Reduced chi-squared = 1.049 for 55 degrees of freedom
# Null hypothesis probability = 3.762977e-01
Photon flux (15-150 keV) in 61.86 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] : 11.6547 ( )
R^2/D10^2 : 9.49005E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 118.04 using 59 PHA bins.
# Reduced chi-squared = 2.0709 for 57 degrees of freedom
# Null hypothesis probability = 3.746852e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.682e-07 2.682e-08
25- 50 5.111e-07 5.066e-08
50-150 4.092e-07 8.230e-08
15-150 1.088e-06 1.191e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 128.243 (-40.3669 70.9561)
Norm : 1.53573 (-0.150579 0.195247)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.50 using 59 PHA bins.
# Reduced chi-squared = 1.114 for 57 degrees of freedom
# Null hypothesis probability = 2.581746e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.467e-07 2.880e-08
25- 50 4.463e-07 6.112e-08
50-150 8.222e-07 3.360e-07
15-150 1.515e-06 4.046e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.12178 (-1.09333 1.32705)
R1^2/D10^2 : 0.810014 (-0.411644 0.909059)
kT2 [keV] : 28.5611 (-7.132 15.8393)
R2^2/D10^2 : 3.06347E-03 (-0.00224729 0.0052297)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.21 using 59 PHA bins.
# Reduced chi-squared = 1.058 for 55 degrees of freedom
# Null hypothesis probability = 3.579539e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.816e-07 6.065e-08
25- 50 4.178e-07 8.939e-08
50-150 9.092e-07 3.824e-07
15-150 1.609e-06 4.933e-07
Peak spectrum fit
Power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.58660 ( -0.322021 0.33259 )
Norm@50keV : 8.85148E-03 ( -0.00194888 0.00191904 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 51.10 using 59 PHA bins.
# Reduced chi-squared = 0.8965 for 57 degrees of freedom
# Null hypothesis probability = 6.949921e-01
Photon flux (15-150 keV) in 1 sec: 1.13280 ( -0.23513 0.23535 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.29142e-08 ( -1.9214e-08 1.96238e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 7.57856E-03 ( -3.07353 1.63062 )
Epeak [keV] : 55.5536 ( -15.1415 -55.5456 )
Norm@50keV : 6.73356E-02 ( -0.0674054 4.03844 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 48.44 using 59 PHA bins.
# Reduced chi-squared = 0.8650 for 56 degrees of freedom
# Null hypothesis probability = 7.535169e-01
Photon flux (15-150 keV) in 1 sec: 1.09020 ( -0.243673 0.24193 ) ph/cm2/s
Energy fluence (15-150 keV) : 7.28841e-08 ( -2.06642e-08 2.26347e-08 ) ergs/cm2
Band function
Time interval is from -0.388 sec. to 0.612 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.97974 ( -3.05448 -1.84744 )
beta : -2.35282 ( 2.30245 0.896242 )
Epeak [keV] : 39.0118 ( -12.6056 37.2761 )
Norm@50keV : 5.70493 ( -5.69905 51.3727 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 46.94 using 59 PHA bins.
# Reduced chi-squared = 0.8534 for 55 degrees of freedom
# Null hypothesis probability = 7.719290e-01
Photon flux (15-150 keV) in 1 sec: 1.16429 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.6311e-08 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.2836 (-2.32528 3.13431)
R^2/D10^2 : 0.276246 (-0.157173 0.316979)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.52 using 59 PHA bins.
# Reduced chi-squared = 0.8688 for 57 degrees of freedom
# Null hypothesis probability = 7.487143e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.830e-09 3.081e-09
25- 50 2.855e-08 1.052e-08
50-150 2.630e-08 1.309e-08
15-150 6.369e-08 2.057e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 156.106 (-85.2075 -154.696)
Norm : 4.75240 (-1.02383 1.34966)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 49.88 using 59 PHA bins.
# Reduced chi-squared = 0.8752 for 57 degrees of freedom
# Null hypothesis probability = 7.367156e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.216e-08 6.990e-09
25- 50 2.267e-08 1.281e-08
50-150 4.549e-08 2.814e-08
15-150 8.033e-08 4.768e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.78990 (-10.4019 3.56855)
R1^2/D10^2 : 0.500407 (-0.271013 -0.43701)
kT2 [keV] : 32.7500 (-52.4026 -52.4026)
R2^2/D10^2 : 3.91818E-03 (-0.000850155 0.362618)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.26 using 59 PHA bins.
# Reduced chi-squared = 0.8593 for 55 degrees of freedom
# Null hypothesis probability = 7.615385e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.032e-08 6.295e-09
25- 50 2.735e-08 1.623e-08
50-150 4.039e-08 2.302e-08
15-150 7.806e-08 4.391e-08
Plot creation:
Thu May 16 14:24:56 EDT 2019