batgrbproduct Analysis for Trigger=650530
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): Tue Jul 28 18:31:38 EDT 2015
Host Name: bat1
Current Working Dir: /local/data/bat1/prebascript/trigger650530/GCN5_download_cron
======================================================================
Trigger: 00650530 Segment: 000
BAT Trigger Time: 459716537.344 [s; MET]
Trigger Stop: 459716538.368 [s; MET]
UTC: 2015-07-27T19:02:02.432140 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 203.990397249456 Dec: -18.354840842608 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.59
Image Trigger?: NO
Rate S/N Ratio: 14.8996644257513 [ if not an image trigger ]
Image S/N Ratio: 7.59
Flight Position: [ source = BAT ]
RA: 203.990397249456 Dec: -18.354840842608 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 203.968094734136 Dec: -18.3197945039191 [deg; J2000]
{ 13h 35m 52.3s , -18d 19' 11.3" }
+/- 1.01838010223331 [arcmin] (estimated 90% radius based on SNR)
+/- 0.321387704083927 [arcmin] (formal 1-sigma fit error)
SNR: 29.6359269361862
Angular difference between Flight and Ground position is 2.456643 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 87.9279999732971 +/- 13.4143261252964
Measured from: -4.51999986171722
to: 83.4080001115799 [s; relative to TRIGTIME]
T50: 30.0279999375343 +/- 3.28946743339743
Measured from: 5.33200013637543
to: 35.3600000739098 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 9.21200001239777
to: 10.2120000123978 [s; relative to TRIGTIME]
Total Fluence
Measured from: -8.69599997997284
to: 95.944000005722 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 1.022980 1.802509 1.843955 0.458313
0.064374 0.066575 0.062830 0.062618 [error]
Peak 0.024499 0.047342 0.053781 0.018986
0.007109 0.007588 0.007210 0.006885 [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 3.25e-07 7.46e-07 1.36e-06 5.85e-06 3.69e-06 8.28e-06 erg/cm2
Error 2.70e-08 3.58e-08 6.30e-08 6.42e-07 1.61e-07 6.72e-07 erg/cm2
Peak flux Power-law 2.27e-01 3.11e-01 3.15e-01 5.79e-01 1.04e+00 1.43e+00 ph/cm2/s
Error 8.23e-02 6.74e-02 5.64e-02 2.37e-01 1.78e-01 2.64e-01 ph/cm2/s
Fluence Cutoff-PL 2.97e-07 7.61e-07 1.40e-06 3.66e-06 3.60e-06 6.12e-06 erg/cm2
Error 3.49e-08 3.88e-08 7.32e-08 1.40e-06 1.77e-07 1.39e-06 erg/cm2
Peak flux Cutoff-PL 2.22e-01 3.12e-01 3.17e-01 5.39e-01 1.03e+00 1.39e+00 ph/cm2/s
Error 9.42e-02 5.23e-02 6.43e-02 4.18e-01 1.83e-01 3.60e-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 1.139 0.074 - - 3.41e-03 1.36e-04 72.950 57
CPL 0.780 0.306 192.5 294.5 4.93e-03 1.53e-03 68.550 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.983 0.310 - - 9.02e-03 1.52e-03 56.660 57
CPL 0.916 0.175 944.0 0.0 9.65e-03 1.16e-02 56.650 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: 84.032000 sec.
T50 in the 50-300 keV band: 26.112000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 104.640 -8.696 95.944
T90 87.928 -4.520 83.408
T50 30.028 5.332 35.360
Peak 1.000 9.212 10.212
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
203.9681 -18.3198 0.0065 25.2 -122.3 2.5874 29.6 TRIG_00650530
------------------------------------------
Foreground time interval of the image:
-8.696 16.857 (delta_t = 25.553 [sec])
Background time interval of the image:
-106.143 -8.696 (delta_t = 97.447 [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 -8.696 sec. to 95.944 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.13894 ( -0.0745403 0.0740371 )
Norm@50keV : 3.41173E-03 ( -0.000135791 0.000135735 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 72.95 using 59 PHA bins.
# Reduced chi-squared = 1.280 for 57 degrees of freedom
# Null hypothesis probability = 7.571605e-02
Photon flux (15-150 keV) in 104.6 sec: 0.397361 ( -0.0164673 0.0165053 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.68606e-06 ( -1.61105e-07 1.61706e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -8.696 sec. to 95.944 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.779829 ( -0.316704 0.294467 )
Epeak [keV] : 192.461 ( -64.0631 525.022 )
Norm@50keV : 4.92759E-03 ( -0.00125354 0.00181076 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.55 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 56 degrees of freedom
# Null hypothesis probability = 1.211578e-01
Photon flux (15-150 keV) in 104.6 sec: 0.388672 ( -0.017862 0.017873 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.60186e-06 ( -1.77726e-07 1.76962e-07 ) ergs/cm2
Band function
Time interval is from -8.696 sec. to 95.944 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.780059 ( -0.264112 0.144131 )
beta : -10.00000 ( 10 1.92415e-11 )
Epeak [keV] : 192.523 ( -73.6889 520.67 )
Norm@50keV : 4.92618E-03 ( -0.00125247 0.00181117 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 68.55 using 59 PHA bins.
# Reduced chi-squared = 1.246 for 55 degrees of freedom
# Null hypothesis probability = 1.036089e-01
Photon flux (15-150 keV) in 104.6 sec: 0.390670 ( ) 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] : 20.5118 ( )
R^2/D10^2 : 1.68434E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 151.00 using 59 PHA bins.
# Reduced chi-squared = 2.6492 for 57 degrees of freedom
# Null hypothesis probability = 1.936816e-10
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.414e-07 1.140e-08
25- 50 7.163e-07 4.597e-08
50-150 2.241e-06 1.585e-07
15-150 3.099e-06 1.517e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 1.65936 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 157.36 using 59 PHA bins.
# Reduced chi-squared = 2.7607 for 57 degrees of freedom
# Null hypothesis probability = 2.453169e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.322e-07 1.862e-08
25- 50 8.314e-07 3.583e-08
50-150 1.823e-06 8.682e-08
15-150 3.087e-06 1.370e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.61308 (-1.08745 1.31071)
R1^2/D10^2 : 0.338789 (-0.156359 0.32034)
kT2 [keV] : 27.6434 (-2.63006 3.56586)
R2^2/D10^2 : 5.75690E-03 (-0.00192877 0.00232303)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.77 using 59 PHA bins.
# Reduced chi-squared = 1.159 for 55 degrees of freedom
# Null hypothesis probability = 1.954545e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.094e-07 6.506e-08
25- 50 7.362e-07 9.362e-08
50-150 2.536e-06 2.620e-07
15-150 3.581e-06 3.332e-07
Peak spectrum fit
Power-law model
Time interval is from 9.212 sec. to 10.212 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.983148 ( -0.318675 0.301651 )
Norm@50keV : 9.02479E-03 ( -0.00152709 0.00151319 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.66 using 59 PHA bins.
# Reduced chi-squared = 0.9941 for 57 degrees of freedom
# Null hypothesis probability = 4.876390e-01
Photon flux (15-150 keV) in 1 sec: 1.03804 ( -0.177596 0.178947 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.81819e-08 ( -1.76249e-08 1.77968e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 9.212 sec. to 10.212 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.915531 ( -1.26518 -0.915317 )
Epeak [keV] : 944.004 ( -944.707 -944.707 )
Norm@50keV : 9.65327E-03 ( -0.00190103 0.02124 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.65 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 56 degrees of freedom
# Null hypothesis probability = 4.505174e-01
Photon flux (15-150 keV) in 1 sec: 1.03468 ( -0.185626 0.18126 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.79266e-08 ( -1.84452e-08 1.79854e-08 ) ergs/cm2
Band function
Time interval is from 9.212 sec. to 10.212 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 5.00000 ( -5 -5 )
beta : -0.989982 ( -0.308993 0.322136 )
Epeak [keV] : 20.4180 ( -20.4197 19.429 )
Norm@50keV : 1963.74 ( -322.286 2.23549e+06 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 56.61 using 59 PHA bins.
# Reduced chi-squared = 1.029 for 55 degrees of freedom
# Null hypothesis probability = 4.145798e-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] : 24.6043 (-5.27344 7.55705)
R^2/D10^2 : 2.60163E-02 (-0.0142781 0.0289528)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 63.21 using 59 PHA bins.
# Reduced chi-squared = 1.109 for 57 degrees of freedom
# Null hypothesis probability = 2.664761e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.759e-09 1.095e-09
25- 50 1.552e-08 5.083e-09
50-150 6.984e-08 2.274e-08
15-150 8.812e-08 2.813e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 200.000 ( )
Norm : 4.25146 (-0.736241 0.736167)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.43 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 57 degrees of freedom
# Null hypothesis probability = 1.839683e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.059e-08 6.325e-09
25- 50 2.036e-08 1.167e-08
50-150 4.466e-08 2.550e-08
15-150 7.561e-08 4.304e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.59962 (-2.94857 4.70798)
R1^2/D10^2 : 0.950160 (-0.796529 8.48018)
kT2 [keV] : 33.9422 (-9.84271 28.6604)
R2^2/D10^2 : 8.94641E-03 (-0.00715723 0.0165831)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 55.09 using 59 PHA bins.
# Reduced chi-squared = 1.002 for 55 degrees of freedom
# Null hypothesis probability = 4.712615e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.718e-09 4.641e-09
25- 50 1.722e-08 9.150e-09
50-150 7.497e-08 4.102e-08
15-150 9.992e-08 5.235e-08
Plot creation:
Tue Jul 28 18:36:51 EDT 2015