batgrbproduct Analysis for Trigger=520658
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 Apr 22 17:36:53 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger520658/GCN5_download_cron
======================================================================
Trigger: 00520658 Segment: 000
BAT Trigger Time: 356771531.776 [s; MET]
Trigger Stop: 356771535.872 [s; MET]
UTC: 2012-04-22T07:12:03.648220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 136.929034138057 Dec: 14.0064324830064 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.33
Image Trigger?: NO
Rate S/N Ratio: 11.8321595661992 [ if not an image trigger ]
Image S/N Ratio: 8.33
Flight Position: [ source = BAT ]
RA: 136.929034138057 Dec: 14.0064324830064 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 136.912341765385 Dec: 13.983595977031 [deg; J2000]
{ 09h 07m 39.0s , +13d 59' 00.9" }
+/- 2.03222811964528 [arcmin] (estimated 90% radius based on SNR)
+/- 0.679448421528523 [arcmin] (formal 1-sigma fit error)
SNR: 11.0447967454903
Angular difference between Flight and Ground position is 1.679834 arcmin
Partial Coding Fraction: 0.6875 [ including projection effects ]
Duration
T90: 7 +/- 2.23606797749979
Measured from: -0.775999903678894
to: 6.22400009632111 [s; relative to TRIGTIME]
T50: 3 +/- 1.4142135623731
Measured from: 1.22400009632111
to: 4.22400009632111 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.22399997711182
to: 2.22399997711182 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.776000022888184
to: 7.22399997711182 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.067458 0.152132 0.112761 0.012796
0.017604 0.018590 0.016763 0.014631 [error]
Peak 0.013233 0.022819 0.030271 0.001029
0.006282 0.006587 0.006083 0.005406 [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 2.48e-08 5.24e-08 8.67e-08 3.25e-07 2.39e-07 4.89e-07 erg/cm2
Error 6.39e-09 8.39e-09 1.58e-08 1.28e-07 3.99e-08 1.40e-07 erg/cm2
Peak flux Power-law 1.17e-01 1.64e-01 1.71e-01 3.26e-01 5.54e-01 7.78e-01 ph/cm2/s
Error 6.32e-02 5.49e-02 4.68e-02 1.97e-01 1.48e-01 2.24e-01 ph/cm2/s
Fluence Cutoff-PL 2.15e-08 5.74e-08 9.12e-08 1.01e-07 2.72e-07 0.00e+00 erg/cm2
Error 7.37e-09 1.06e-08 1.82e-08 1.68e-07 1.75e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 7.02e-02 1.64e-01 2.00e-01 1.20e-01 5.13e-01 5.54e-01 ph/cm2/s
Error 8.08e-02 7.18e-02 6.37e-02 1.45e-01 1.60e-01 2.82e-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 6.29e-01 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 1.274 0.247 - - 3.00e-03 4.46e-04 67.860 57
CPL 0.398 1.099 91.5 -30.7 8.31e-03 1.71e-02 65.490 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 0.943 0.458 - - 4.83e-03 1.28e-03 52.930 57
CPL -0.558 2.948 103.6 -34.1 1.95e-02 2.44e-01 51.390 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: 3.072000 sec.
T50 in the 50-300 keV band: 1.856000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 8.000 -0.776 7.224
T90 7.000 -0.776 6.224
T50 3.000 1.224 4.224
Peak 1.000 1.224 2.224
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
136.9123 +13.9836 0.0175 23.6 -111.1 0.3854 11.0 TRIG_00520658
------------------------------------------
Foreground time interval of the image:
-0.776 7.224 (delta_t = 8.000 [sec])
Background time interval of the image:
-239.776 -0.776 (delta_t = 239.000 [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 -0.776 sec. to 7.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.27364 ( -0.248517 0.245242 )
Norm@50keV : 3.00165E-03 ( -0.000446481 0.000445807 )
------------------------------------------------------------
# Chi-Squared = 67.86 using 59 PHA bins.
# Reduced chi-squared = 1.190 for 57 degrees of freedom
# Null hypothesis probability = 1.538501e-01
Photon flux (15-150 keV) in 8 sec: 0.356425 ( -0.0534369 0.0535256 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.38859e-07 ( -3.9562e-08 4.0181e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.776 sec. to 7.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.398172 ( -1.24347 0.955137 )
Epeak [keV] : 91.4885 ( -30.1167 -91.4894 )
Norm@50keV : 8.30823E-03 ( -0.00830801 0.0257989 )
------------------------------------------------------------
# Chi-Squared = 65.49 using 59 PHA bins.
# Reduced chi-squared = 1.169 for 56 degrees of freedom
# Null hypothesis probability = 1.807143e-01
Photon flux (15-150 keV) in 8 sec: 0.344508 ( -0.055118 0.055166 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.71578e-07 ( -8.2884e-08 2.67155e-07 ) ergs/cm2
Band function
Time interval is from -0.776 sec. to 7.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.442489 ( -0.785096 1.08931 )
beta : -9.37167 ( 10 20 )
Epeak [keV] : 94.6492 ( -94.5681 234.554 )
Norm@50keV : 7.83596E-03 ( -0.00498488 0.00959253 )
------------------------------------------------------------
# Chi-Squared = 65.50 using 59 PHA bins.
# Reduced chi-squared = 1.191 for 55 degrees of freedom
# Null hypothesis probability = 1.571880e-01
Photon flux (15-150 keV) in 8 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] : 16.4912 (-2.88064 3.64485)
R^2/D10^2 : 3.10577E-02 (-0.0152568 0.0287)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 70.95 using 59 PHA bins.
# Reduced chi-squared = 1.245 for 57 degrees of freedom
# Null hypothesis probability = 1.013417e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.387e-08 4.036e-09
25- 50 5.988e-08 1.380e-08
50-150 1.151e-07 3.331e-08
15-150 1.888e-07 4.320e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 1.47098 (-1.47098 -1.47098)
------------------------------------------------------------
# Chi-Squared = 69.77 using 59 PHA bins.
# Reduced chi-squared = 1.224 for 57 degrees of freedom
# Null hypothesis probability = 1.193448e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.930e-08 1.612e-08
25- 50 5.637e-08 3.076e-08
50-150 1.236e-07 6.776e-08
15-150 2.093e-07 1.137e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 8.53125 (-3.25273 4.88537)
R1^2/D10^2 : 0.162866 (-0.116824 0.300764)
kT2 [keV] : 27.8375 (-22.4559 75.9173)
R2^2/D10^2 : 3.97517E-03 (-0.00393423 0.0151609)
------------------------------------------------------------
# Chi-Squared = 64.15 using 59 PHA bins.
# Reduced chi-squared = 1.166 for 55 degrees of freedom
# Null hypothesis probability = 1.864174e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.194e-08 1.273e-08
25- 50 5.903e-08 3.259e-08
50-150 1.465e-07 8.260e-08
15-150 2.275e-07 1.160e-07
Peak spectrum fit
Power-law model
Time interval is from 1.224 sec. to 2.224 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.942514 ( -0.475298 0.440152 )
Norm@50keV : 4.82678E-03 ( -0.00129012 0.0012739 )
------------------------------------------------------------
# Chi-Squared = 52.93 using 59 PHA bins.
# Reduced chi-squared = 0.9287 for 57 degrees of freedom
# Null hypothesis probability = 6.283481e-01
Photon flux (15-150 keV) in 1 sec: 0.554392 ( -0.147746 0.149254 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.32874e-08 ( -1.46601e-08 1.49173e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.224 sec. to 2.224 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.557863 ( -4.18803 1.70866 )
Epeak [keV] : 103.580 ( -35.6009 -103.703 )
Norm@50keV : 1.95093E-02 ( -0.0201311 0.46819 )
------------------------------------------------------------
# Chi-Squared = 51.39 using 59 PHA bins.
# Reduced chi-squared = 0.9176 for 56 degrees of freedom
# Null hypothesis probability = 6.499000e-01
Photon flux (15-150 keV) in 1 sec: 0.513096 ( -0.160047 0.160185 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.02042e-08 ( -1.52289e-08 1.57175e-08 ) ergs/cm2
Band function
Time interval is from 1.224 sec. to 2.224 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.38549 ( 0.455929 4.7128 )
beta : 10.00000 ( -1.97895e+15 -1.97895e+15 )
Epeak [keV] : 6.29921 ( -6.29921 -6.29921 )
Norm@50keV : 2.73232E-19 ( -2.73232e-19 -2.73232e-19 )
------------------------------------------------------------
# Chi-Squared = 53.60 using 59 PHA bins.
# Reduced chi-squared = 0.9745 for 55 degrees of freedom
# Null hypothesis probability = 5.283866e-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] : 23.3953 (-6.0194 9.73656)
R^2/D10^2 : 1.71032E-02 (-0.0111744 0.026731)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 51.46 using 59 PHA bins.
# Reduced chi-squared = 0.9029 for 57 degrees of freedom
# Null hypothesis probability = 6.819663e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.682e-09 1.017e-09
25- 50 9.215e-09 5.455e-09
50-150 3.765e-08 2.191e-08
15-150 4.854e-08 2.368e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.999 ( )
Norm : 2.26110 (-2.2611 -2.2611)
------------------------------------------------------------
# Chi-Squared = 57.67 using 59 PHA bins.
# Reduced chi-squared = 1.012 for 57 degrees of freedom
# Null hypothesis probability = 4.504003e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.630e-09 3.346e-09
25- 50 1.083e-08 6.540e-09
50-150 2.375e-08 1.413e-08
15-150 4.021e-08 2.382e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.72528 (-3.70988 -3.70988)
R1^2/D10^2 : 2.56286 (-2.60198 58.0643)
kT2 [keV] : 24.8220 (-6.85636 -24.8141)
R2^2/D10^2 : 1.38638E-02 (-0.0138786 0.024573)
------------------------------------------------------------
# Chi-Squared = 50.76 using 59 PHA bins.
# Reduced chi-squared = 0.9229 for 55 degrees of freedom
# Null hypothesis probability = 6.373418e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.123e-09 1.810e-09
25- 50 8.899e-09 5.170e-09
50-150 3.851e-08 2.423e-08
15-150 5.053e-08 2.922e-08
Plot creation:
Sun Apr 22 17:52:51 EDT 2012