batgrbproduct Analysis for Trigger=558753
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): Sat Jun 22 15:17:12 EDT 2013
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger558753/GCN5_download_cron
======================================================================
Trigger: 00558753 Segment: 000
BAT Trigger Time: 393559848 [s; MET]
Trigger Stop: 393559920 [s; MET]
UTC: 2013-06-22T02:10:37.297500 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.231373544066 Dec: -15.3958555039321 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 15.57
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 15.57
Flight Position: [ source = BAT ]
RA: 245.231373544066 Dec: -15.3958555039321 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.233989372927 Dec: -15.4269752054865 [deg; J2000]
{ 16h 20m 56.2s , -15d 25' 37.1" }
+/- 1.04303974992178 [arcmin] (estimated 90% radius based on SNR)
+/- 0.365640947411475 [arcmin] (formal 1-sigma fit error)
SNR: 28.6400844935313
Angular difference between Flight and Ground position is 1.873303 arcmin
Partial Coding Fraction: 0.4414062 [ including projection effects ]
Duration
T90: 669.043999910355 +/- 77.5259874225858
Measured from: -67.7839998602867
to: 601.260000050068 [s; relative to TRIGTIME]
T50: 311.195999920368 +/- 33.386584411397
Measured from: 28.9480001330376
to: 340.144000053406 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 67.5400000214577
to: 68.5400000214577 [s; relative to TRIGTIME]
Total Fluence
Measured from: -88
to: 747.308000028133 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 24.909938 1.793696 0.125808 -0.037507
0.276125 0.260200 0.226767 0.201435 [error]
Peak 0.041407 0.021733 0.021557 0.012683
0.009395 0.009599 0.007988 0.007329 [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 8.51e-06 9.50e-07 4.45e-08 2.18e-09 9.50e-06 9.50e-06 erg/cm2
Error 7.24e-07 1.21e-07 1.46e-08 1.23e-09 7.16e-07 7.16e-07 erg/cm2
Peak flux Power-law 4.95e-01 2.10e-01 5.30e-02 1.63e-02 7.69e-01 7.76e-01 ph/cm2/s
Error 1.81e-01 1.13e-01 6.49e-02 4.71e-02 2.32e-01 2.40e-01 ph/cm2/s
Fluence Cutoff-PL 8.25e-06 6.41e-07 2.07e-10 3.02e-18 8.89e-06 8.89e-06 erg/cm2
Error 8.45e-07 1.39e-07 9.46e-10 7.56e-15 8.52e-07 8.52e-07 erg/cm2
Peak flux Cutoff-PL 4.93e-01 2.12e-01 5.38e-02 1.67e-02 7.71e-01 7.79e-01 ph/cm2/s
Error 1.31e-01 1.54e-01 4.43e-02 3.71e-02 2.27e-01 2.37e-01 ph/cm2/s
Fluence Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 erg/cm2
Peak flux Band 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
=== Time-averaged spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 6.415 0.301 - - 6.17e-05 1.66e-05 59.420 57
CPL 1.000 0.000 50.0 0.0 1.24e-03 0.00e+00 545.000 56
The chi2 of BB fit is 39.45 which shows a significant improvement in the fit over a PL.
Check the BB fit.
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.977 1.352 - - 2.85e-03 2.81e-03 62.380 57
CPL 1.958 0.000 2.2 0.0 9.72e-03 0.00e+00 64.490 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 835.308 -88.000 747.308
T90 669.044 -67.784 601.260
T50 311.196 28.948 340.144
Peak 1.000 67.540 68.540
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.2340 -15.4270 0.0067 26.5 104.2 28.7710 28.6 TRIG_00558753
------------------------------------------
Foreground time interval of the image:
-78.499 747.308 (delta_t = 825.807 [sec])
Background time interval of the image:
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 -88.000 sec. to 747.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 6.41470 ( -0.300323 0.301223 )
Norm@50keV : 6.16507E-05 ( -1.47637e-05 1.84423e-05 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 59.42 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.874579e-01
Photon flux (15-150 keV) in 835.3 sec: 0.385992 ( -0.0314791 0.03175 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.50246e-06 ( -7.13962e-07 7.18808e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -88.000 sec. to 747.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 1.24182E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 545.00 using 59 PHA bins.
# Reduced chi-squared = 9.7321 for 56 degrees of freedom
# Null hypothesis probability = 2.618990e-81
Photon flux (15-150 keV) in 835.3 sec: 0.361294 ( -0.038593 0.03743 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.88634e-06 ( -8.64494e-07 8.38808e-07 ) ergs/cm2
Band function
Time interval is from -88.000 sec. to 747.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.65097 ( -2.2695 1.59822 )
beta : -10.0000 ( 10 10 )
Epeak [keV] : 9.67728 ( -1.0838 3.30428 )
Norm@50keV : 216.800 ( -216.8 53639.3 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.58 using 59 PHA bins.
# Reduced chi-squared = 0.7196 for 55 degrees of freedom
# Null hypothesis probability = 9.418449e-01
Photon flux (15-150 keV) in 835.3 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] : 2.54099 (-0.129662 0.142445)
R^2/D10^2 : 160.457 (-59.3458 92.1876)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.45 using 59 PHA bins.
# Reduced chi-squared = 0.6920 for 57 degrees of freedom
# Null hypothesis probability = 9.630629e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.268e-06 1.165e-06
25- 50 6.488e-07 1.049e-07
50-150 2.401e-10 1.353e-10
15-150 8.917e-06 1.026e-06
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 4.28178 (-0.311327 0.356127)
Norm : 158.193 (-50.7731 73.7665)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 41.98 using 59 PHA bins.
# Reduced chi-squared = 0.7365 for 57 degrees of freedom
# Null hypothesis probability = 9.318259e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.479e-06 1.051e-06
25- 50 7.382e-07 1.159e-07
50-150 1.645e-09 8.680e-10
15-150 9.219e-06 1.071e-06
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 47.5005 ( )
R1^2/D10^2 : 4.35945E-06 (-5.29749e-06 0.00244922)
kT2 [keV] : 2.53916 (-0.133043 0.142205)
R2^2/D10^2 : 161.334 (-59.1279 96.111)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 39.45 using 59 PHA bins.
#Fit statistic : Chi-Squared = 39.35 using 59 PHA bins.
# Reduced chi-squared = 0.7172 for 55 degrees of freedom
# Reduced chi-squared = 0.7155 for 55 degrees of freedom
# Null hypothesis probability = 9.436603e-01
# Null hypothesis probability = 9.449512e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.274e-06 1.487e+03
25- 50 6.500e-07 1.453e+04
50-150 2.413e-10 3.632e+05
15-150 8.924e-06 3.648e+05
Peak spectrum fit
Power-law model
Time interval is from 67.540 sec. to 68.540 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.97677 ( -0.983499 1.72113 )
Norm@50keV : 2.84584E-03 ( -0.00282504 0.00279992 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.38 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 57 degrees of freedom
# Null hypothesis probability = 2.907991e-01
Photon flux (15-150 keV) in 1 sec: 0.768787 ( -0.23378 0.231001 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.36841e-08 ( -1.48673e-08 1.89858e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 67.540 sec. to 68.540 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95796 ( )
Epeak [keV] : 2.16390 ( )
Norm@50keV : 9.72216E-03 ( )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.49 using 59 PHA bins.
# Reduced chi-squared = 1.152 for 56 degrees of freedom
# Null hypothesis probability = 2.040844e-01
Photon flux (15-150 keV) in 1 sec: 0.770954 ( -0.231983 0.222536 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.33182e-08 ( -1.44968e-08 1.7253e-08 ) ergs/cm2
Band function
Time interval is from 67.540 sec. to 68.540 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.98765 ( 9.98765 9.98765 )
beta : -2.98413 ( -1.71399 0.99129 )
Epeak [keV] : 4.37879 ( -4.37879 -4.37879 )
Norm@50keV : 0.384525 ( -0.382871 0.38164 )
------------------------------------------------------------
#Fit statistic : Chi-Squared = 62.38 using 59 PHA bins.
# Reduced chi-squared = 1.134 for 55 degrees of freedom
# Null hypothesis probability = 2.303964e-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] : 3.87263 (-1.38745 2.15017)
R^2/D10^2 : 20.7734 (-20.8505 266.003)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 66.03 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.930678e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.612e-08 9.505e-09
25- 50 5.301e-09 3.333e-09
50-150 5.282e-11 5.800e-11
15-150 2.147e-08 1.272e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 11.7269 (-6.67532 42.8207)
Norm : 17.9454 (-17.8149 108.126)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 64.67 using 59 PHA bins.
# Reduced chi-squared = 1.135 for 57 degrees of freedom
# Null hypothesis probability = 2.264216e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.562e-08 9.210e-09
25- 50 8.222e-09 5.305e-09
50-150 8.481e-10 8.650e-10
15-150 2.469e-08 1.459e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.52023 (-1.33468 1.69084)
R1^2/D10^2 : 33.3611 (-29.058 157.975)
kT2 [keV] : 68.0741 (-52.1302 -69.1565)
R2^2/D10^2 : 6.38218E-04 (-0.000488751 0.0270892)
------------------------------------------------------------
#Fit statistic : Chi-Squared = 58.14 using 59 PHA bins.
# Reduced chi-squared = 1.057 for 55 degrees of freedom
# Null hypothesis probability = 3.603756e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.602e-08 9.490e-09
25- 50 5.820e-09 3.078e-09
50-150 3.045e-08 1.791e-08
15-150 5.230e-08 2.892e-08
Plot creation:
Sat Jun 22 15:25:41 EDT 2013