batgrbproduct Analysis for Trigger=530581
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 Aug 11 12:00:33 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger530581/GCN5_download_cron
======================================================================
Trigger: 00530581 Segment: 000
BAT Trigger Time: 366345328.448 [s; MET]
Trigger Stop: 366345329.472 [s; MET]
UTC: 2012-08-11T02:35:18.923980 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 257.18263991766 Dec: -22.7358138782081 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 7.05
Image Trigger?: NO
Rate S/N Ratio: 10.2469507659596 [ if not an image trigger ]
Image S/N Ratio: 7.05
Flight Position: [ source = BAT ]
RA: 257.18263991766 Dec: -22.7358138782081 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 257.18372421682 Dec: -22.7351986610098 [deg; J2000]
{ 17h 08m 44.1s , -22d 44' 06.7" }
+/- 2.61985590752851 [arcmin] (estimated 90% radius based on SNR)
+/- 1.46200708313359 [arcmin] (formal 1-sigma fit error)
SNR: 7.68385620586114
Angular difference between Flight and Ground position is 0.070448 arcmin
Partial Coding Fraction: 0.984375 [ including projection effects ]
Duration
T90: 165.995999932289 +/- 52.4615523775905
Measured from: -11.0959998965263
to: 154.900000035763 [s; relative to TRIGTIME]
T50: 23.1279999017715 +/- 39.4885194890551
Measured from: -2.11199986934662
to: 21.0160000324249 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.427999973297119
to: 1.42799997329712 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.1560000181198
to: 169.06400001049 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.819487 0.762197 0.419975 0.109804
0.078434 0.069586 0.057948 0.049334 [error]
Peak 0.052320 0.042016 0.025110 -0.000196
0.006131 0.005676 0.004544 0.003842 [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 2.24e-07 3.12e-07 3.22e-07 6.08e-07 1.05e-06 1.47e-06 erg/cm2
Error 3.56e-08 3.22e-08 5.66e-08 2.19e-07 1.28e-07 2.74e-07 erg/cm2
Peak flux Power-law 4.45e-01 3.34e-01 1.67e-01 1.20e-01 1.00e+00 1.07e+00 ph/cm2/s
Error 9.04e-02 4.55e-02 3.84e-02 5.31e-02 1.38e-01 1.46e-01 ph/cm2/s
Fluence Cutoff-PL 2.21e-07 3.17e-07 3.22e-07 4.89e-07 1.35e-06 0.00e+00 erg/cm2
Error 3.90e-08 3.87e-08 5.83e-08 3.99e-07 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.31e-01 3.45e-01 1.68e-01 1.16e-01 9.91e-01 1.02e+00 ph/cm2/s
Error 1.03e-01 5.68e-02 4.03e-02 9.24e-02 1.43e-01 1.72e-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 1.955 0.205 - - 6.24e-04 7.85e-05 42.980 57
CPL 1.838 0.606 60.8 0.0 7.25e-04 0.00e+00 42.910 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.999 0.266 - - 6.69e-03 1.15e-03 61.680 57
CPL 1.713 0.802 43.8 -0.6 9.68e-03 1.87e-02 61.440 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: 23.616000 sec.
T50 in the 50-300 keV band: 12.608000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 183.220 -14.156 169.064
T90 165.996 -11.096 154.900
T50 23.128 -2.112 21.016
Peak 1.000 0.428 1.428
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
257.1837 -22.7352 0.0252 15.7 9.0 1.9055 7.7 TRIG_00530581
------------------------------------------
Foreground time interval of the image:
-14.156 169.064 (delta_t = 183.220 [sec])
Background time interval of the image:
-87.347 -14.156 (delta_t = 73.191 [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 -14.156 sec. to 169.064 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.95487 ( -0.200319 0.209124 )
Norm@50keV : 6.23608E-04 ( -7.94571e-05 7.75142e-05 )
------------------------------------------------------------
# Chi-Squared = 42.98 using 59 PHA bins.
# Reduced chi-squared = 0.7541 for 57 degrees of freedom
# Null hypothesis probability = 9.154933e-01
Photon flux (15-150 keV) in 183.2 sec: 9.16527E-02 ( -0.00959974 0.00961688 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.05152e-06 ( -1.27015e-07 1.29463e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.156 sec. to 169.064 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83762 ( -0.825323 0.385801 )
Epeak [keV] : 60.8181 ( )
Norm@50keV : 7.24732E-04 ( )
------------------------------------------------------------
# Chi-Squared = 42.91 using 59 PHA bins.
# Reduced chi-squared = 0.7662 for 56 degrees of freedom
# Null hypothesis probability = 9.005994e-01
Photon flux (15-150 keV) in 183.2 sec: 9.10906E-02 ( -0.0097245 0.0100024 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34817e-06 ( -3.9523e-07 4.01787e-07 ) ergs/cm2
Band function
Time interval is from -14.156 sec. to 169.064 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.12912 ( 6.57997 8.05172 )
beta : -1.95488 ( -0.20912 0.200374 )
Epeak [keV] : 32.6545 ( -32.6545 -32.6545 )
Norm@50keV : 8.47570E-02 ( -0.0107992 0.0105354 )
------------------------------------------------------------
# Chi-Squared = 42.98 using 59 PHA bins.
# Reduced chi-squared = 0.7815 for 55 degrees of freedom
# Null hypothesis probability = 8.804183e-01
Photon flux (15-150 keV) in 183.2 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] : 10.6032 (-1.39691 1.64669)
R^2/D10^2 : 3.27835E-02 (-0.0138207 0.0236979)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 68.24 using 59 PHA bins.
# Reduced chi-squared = 1.197 for 57 degrees of freedom
# Null hypothesis probability = 1.464018e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.399e-07 2.743e-08
25- 50 3.771e-07 5.276e-08
50-150 2.326e-07 5.949e-08
15-150 7.496e-07 9.856e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 76.2315 (-22.8835 41.1172)
Norm : 0.431129 (-0.0682878 0.0875953)
------------------------------------------------------------
# Chi-Squared = 44.13 using 59 PHA bins.
# Reduced chi-squared = 0.7743 for 57 degrees of freedom
# Null hypothesis probability = 8.936473e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.042e-07 3.281e-08
25- 50 3.323e-07 3.884e-08
50-150 4.538e-07 1.944e-07
15-150 9.903e-07 1.645e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.10364 (-1.65664 1.94641)
R1^2/D10^2 : 0.383864 (-0.266362 1.75043)
kT2 [keV] : 18.9528 (-4.84154 9.8635)
R2^2/D10^2 : 2.84978E-03 (-0.00225605 0.00385498)
------------------------------------------------------------
# Chi-Squared = 43.94 using 59 PHA bins.
# Reduced chi-squared = 0.7989 for 55 degrees of freedom
# Null hypothesis probability = 8.577632e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.224e-07 1.134e-07
25- 50 3.046e-07 1.187e-07
50-150 4.731e-07 2.626e-07
15-150 1.000e-06 4.177e-07
Peak spectrum fit
Power-law model
Time interval is from 0.428 sec. to 1.428 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.99909 ( -0.256755 0.276101 )
Norm@50keV : 6.68747E-03 ( -0.00117059 0.00113075 )
------------------------------------------------------------
# Chi-Squared = 61.68 using 59 PHA bins.
# Reduced chi-squared = 1.082 for 57 degrees of freedom
# Null hypothesis probability = 3.123828e-01
Photon flux (15-150 keV) in 1 sec: 1.00270 ( -0.137444 0.137559 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.16708e-08 ( -9.96474e-09 1.0205e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.428 sec. to 1.428 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.71273 ( -1.15844 0.444886 )
Epeak [keV] : 43.8462 ( -42.5663 -43.846 )
Norm@50keV : 9.68090E-03 ( -0.00480971 0.0325659 )
------------------------------------------------------------
# Chi-Squared = 61.44 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 56 degrees of freedom
# Null hypothesis probability = 2.875259e-01
Photon flux (15-150 keV) in 1 sec: 0.990773 ( -0.143433 0.142807 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.22906e-08 ( -2.92348e-08 1.5916e-08 ) ergs/cm2
Band function
Time interval is from 0.428 sec. to 1.428 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.71492 ( 1.71495 1.16575 )
beta : -9.36867 ( 9.99666 19.9967 )
Epeak [keV] : 43.6201 ( -22.8082 -43.6543 )
Norm@50keV : 9.66516E-03 ( -0.00322401 0.00424017 )
------------------------------------------------------------
# Chi-Squared = 61.44 using 59 PHA bins.
# Reduced chi-squared = 1.117 for 55 degrees of freedom
# Null hypothesis probability = 2.564201e-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] : 10.9015 (-1.77203 2.07579)
R^2/D10^2 : 0.329871 (-0.1596 0.317417)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 75.32 using 59 PHA bins.
# Reduced chi-squared = 1.321 for 57 degrees of freedom
# Null hypothesis probability = 5.246081e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.176e-09 2.169e-09
25- 50 2.285e-08 4.410e-09
50-150 1.523e-08 4.987e-09
15-150 4.626e-08 9.705e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 70.4724 (-24.4718 49.355)
Norm : 4.88402 (-0.989194 1.2691)
------------------------------------------------------------
# Chi-Squared = 61.87 using 59 PHA bins.
# Reduced chi-squared = 1.085 for 57 degrees of freedom
# Null hypothesis probability = 3.066466e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.254e-08 2.518e-09
25- 50 1.999e-08 3.230e-09
50-150 2.580e-08 1.082e-08
15-150 5.833e-08 1.331e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.52973 (-1.34627 2.15459)
R1^2/D10^2 : 20.6185 (-18.1103 320.289)
kT2 [keV] : 15.0997 (-3.23692 5.61408)
R2^2/D10^2 : 8.18343E-02 (-0.059436 0.0708654)
------------------------------------------------------------
# Chi-Squared = 60.16 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 55 degrees of freedom
# Null hypothesis probability = 2.944817e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.379e-08 7.211e-09
25- 50 1.806e-08 8.164e-09
50-150 2.429e-08 1.418e-08
15-150 5.614e-08 2.354e-08
Plot creation:
Sat Aug 11 12:17:28 EDT 2012