batgrbproduct Analysis for Trigger=642018
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sun May 31 11:26:27 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger642018/GCN5_download_cron
======================================================================
Trigger: 00642018 Segment: 000
BAT Trigger Time: 454678951.872 [s; MET]
Trigger Stop: 454678952.896 [s; MET]
UTC: 2015-05-30T11:42:18.222320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 327.523415997874 Dec: 57.4904208320749 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.11
Image Trigger?: NO
Rate S/N Ratio: 23.7697286480094 [ if not an image trigger ]
Image S/N Ratio: 9.11
Flight Position: [ source = BAT ]
RA: 327.523415997874 Dec: 57.4904208320749 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 327.509980956358 Dec: 57.519807597897 [deg; J2000]
{ 21h 50m 02.4s , +57d 31' 11.3" }
+/- 1.20127949845542 [arcmin] (estimated 90% radius based on SNR)
+/- 0.425485207209449 [arcmin] (formal 1-sigma fit error)
SNR: 23.4067514696423
Angular difference between Flight and Ground position is 1.815609 arcmin
Partial Coding Fraction: 0.1757812 [ including projection effects ]
Duration
T90: 6.61999994516373 +/- 0.839437926650678
Measured from: -3.56399983167648
to: 3.05600011348724 [s; relative to TRIGTIME]
T50: 2.87199997901917 +/- 0.533441642597653
Measured from: -1.31999987363815
to: 1.55200010538101 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.480000019073486
to: 1.48000001907349 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.21999996900558
to: 3.49200004339218 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.592223 0.932287 0.820764 0.231867
0.052108 0.058231 0.051489 0.038988 [error]
Peak 0.095579 0.156913 0.160275 0.076579
0.018648 0.022917 0.020897 0.016197 [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 2.38e-07 4.38e-07 6.21e-07 1.85e-06 1.77e-06 3.15e-06 erg/cm2
Error 2.79e-08 3.16e-08 4.96e-08 3.17e-07 1.23e-07 3.52e-07 erg/cm2
Peak flux Power-law 1.12e+00 1.31e+00 1.11e+00 1.60e+00 4.12e+00 5.14e+00 ph/cm2/s
Error 2.97e-01 2.14e-01 1.65e-01 5.03e-01 5.84e-01 7.01e-01 ph/cm2/s
Fluence Cutoff-PL 2.17e-07 4.55e-07 6.49e-07 1.08e-06 1.74e-06 2.40e-06 erg/cm2
Error 3.39e-08 3.68e-08 5.81e-08 5.90e-07 1.29e-07 5.94e-07 erg/cm2
Peak flux Cutoff-PL 1.13e+00 1.32e+00 1.11e+00 1.57e+00 4.13e+00 5.14e+00 ph/cm2/s
Error 3.04e-01 2.17e-01 1.75e-01 6.75e-01 7.30e-01 8.43e-01 ph/cm2/s
Fluence Band 2.15e-07 4.53e-07 6.48e-07 1.10e-06 1.74e-06 2.43e-06 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 1.496 0.110 - - 2.42e-02 1.59e-03 67.960 57
CPL 1.062 0.453 116.9 459.0 3.90e-02 2.00e-02 64.990 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.240 0.231 - - 3.49e-02 4.67e-03 41.810 57
CPL 1.236 1.627 10000.0 0.0 3.50e-02 0.00e+00 41.820 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: 7.296000 sec.
T50 in the 50-300 keV band: 2.752000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 7.712 -4.220 3.492
T90 6.620 -3.564 3.056
T50 2.872 -1.320 1.552
Peak 1.000 0.480 1.480
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
327.5100 +57.5198 0.0083 48.4 166.0 2.8370 23.4 TRIG_00642018
------------------------------------------
Foreground time interval of the image:
-4.220 3.492 (delta_t = 7.712 [sec])
Background time interval of the image:
-239.872 -4.220 (delta_t = 235.652 [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 -4.220 sec. to 3.492 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.49604 ( -0.110261 0.110541 )
Norm@50keV : 2.42193E-02 ( -0.00159016 0.00158891 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 67.96 using 59 PHA bins.
# Reduced chi-squared = 1.192 for 57 degrees of freedom
# Null hypothesis probability = 1.517565e-01
Photon flux (15-150 keV) in 7.712 sec: 3.02031 ( -0.210076 0.210611 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.77303e-06 ( -1.23142e-07 1.23413e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.220 sec. to 3.492 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.06228 ( -0.47614 0.429601 )
Epeak [keV] : 116.907 ( -35.7464 882.264 )
Norm@50keV : 3.89557E-02 ( -0.014314 0.0256349 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.99 using 59 PHA bins.
# Reduced chi-squared = 1.160 for 56 degrees of freedom
# Null hypothesis probability = 1.922238e-01
Photon flux (15-150 keV) in 7.712 sec: 2.96438 ( -0.21711 0.21756 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74232e-06 ( -1.2906e-07 1.28436e-07 ) ergs/cm2
Band function
Time interval is from -4.220 sec. to 3.492 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06327 ( -0.330483 0.409018 )
beta : -9.37165 ( 9.37167 19.3717 )
Epeak [keV] : 118.378 ( -27.6044 1392.4 )
Norm@50keV : 3.87386E-02 ( -0.0098658 0.0121646 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.99 using 59 PHA bins.
# Reduced chi-squared = 1.182 for 55 degrees of freedom
# Null hypothesis probability = 1.677661e-01
Photon flux (15-150 keV) in 7.712 sec: 2.98089 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.74115e-06 ( 0 0 ) ergs/cm2
Single BB
Spectral model blackbody:
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 16.4666 (-1.32023 1.45738)
R^2/D10^2 : 0.250177 (-0.0652545 0.0867284)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 113.04 using 59 PHA bins.
# Reduced chi-squared = 1.9832 for 57 degrees of freedom
# Null hypothesis probability = 1.435791e-05
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.074e-07 1.427e-08
25- 50 4.632e-07 4.388e-08
50-150 8.871e-07 1.021e-07
15-150 1.458e-06 1.037e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 12.4426 (-0.817923 0.817932)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.77 using 59 PHA bins.
# Reduced chi-squared = 1.171 for 57 degrees of freedom
# Null hypothesis probability = 1.763567e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.400e-07 1.886e-08
25- 50 4.616e-07 3.760e-08
50-150 1.012e-06 1.917e-07
15-150 1.714e-06 2.236e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.21110 (-1.79785 2.14308)
R1^2/D10^2 : 2.61064 (-1.4564 4.57415)
kT2 [keV] : 25.9054 (-4.4565 8.19754)
R2^2/D10^2 : 4.07696E-02 (-0.026153 0.0438852)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.17 using 59 PHA bins.
# Reduced chi-squared = 1.203 for 55 degrees of freedom
# Null hypothesis probability = 1.439335e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.092e-07 7.207e-08
25- 50 4.588e-07 1.138e-07
50-150 1.074e-06 3.085e-07
15-150 1.742e-06 4.346e-07
Peak spectrum fit
Power-law model
Time interval is from 0.480 sec. to 1.480 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23995 ( -0.23394 0.228528 )
Norm@50keV : 3.48718E-02 ( -0.00467323 0.00466692 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.81 using 59 PHA bins.
# Reduced chi-squared = 0.7336 for 57 degrees of freedom
# Null hypothesis probability = 9.343167e-01
Photon flux (15-150 keV) in 1 sec: 4.11775 ( -0.583066 0.585311 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49927e-07 ( -4.96435e-08 4.98283e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.480 sec. to 1.480 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23581 ( -0.410528 2.84448 )
Epeak [keV] : 1.00000E+04 ( )
Norm@50keV : 3.50330E-02 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.82 using 59 PHA bins.
# Reduced chi-squared = 0.7468 for 56 degrees of freedom
# Null hypothesis probability = 9.205257e-01
Photon flux (15-150 keV) in 1 sec: 4.12724 ( -0.88558 0.57467 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.49279e-07 ( -4.8977e-08 5.0331e-08 ) ergs/cm2
Band function
Time interval is from 0.480 sec. to 1.480 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.75516 ( -4.75516 -4.75516 )
beta : -1.36161 ( -0.163243 0.275424 )
Epeak [keV] : 30.0463 ( -30.0463 6.95377 )
Norm@50keV : 686.148 ( -91.2244 1.15236e+07 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 40.90 using 59 PHA bins.
# Reduced chi-squared = 0.7436 for 55 degrees of freedom
# Null hypothesis probability = 9.214836e-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] : 18.7034 (-3.654 5.16173)
R^2/D10^2 : 0.229873 (-0.22709 0.251175)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 60.90 using 59 PHA bins.
# Reduced chi-squared = 1.068 for 57 degrees of freedom
# Null hypothesis probability = 3.375110e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.590e-08 4.636e-09
25- 50 7.560e-08 1.899e-08
50-150 1.937e-07 5.050e-08
15-150 2.852e-07 5.750e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 17.3507 (-2.36361 2.36316)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 47.98 using 59 PHA bins.
# Reduced chi-squared = 0.8417 for 57 degrees of freedom
# Null hypothesis probability = 7.970253e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.323e-08 2.452e-08
25- 50 8.316e-08 4.678e-08
50-150 1.824e-07 1.014e-07
15-150 3.088e-07 1.718e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.37693 (-2.70995 3.33237)
R1^2/D10^2 : 1.72816 (-1.07595 3.48614)
kT2 [keV] : 52.9706 (-22.7194 -52.971)
R2^2/D10^2 : 7.59816E-03 (-0.00667125 0.0318585)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.81 using 59 PHA bins.
# Reduced chi-squared = 0.7238 for 55 degrees of freedom
# Null hypothesis probability = 9.385779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.240e-08 1.794e-08
25- 50 8.458e-08 4.175e-08
50-150 2.397e-07 1.271e-07
15-150 3.566e-07 1.689e-07
Plot creation:
Sun May 31 11:30:24 EDT 2015