batgrbproduct Analysis for Trigger=516997
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 Mar 6 11:53:01 EST 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger516997/GCN5_download_cron
======================================================================
Trigger: 00516997 Segment: 000
BAT Trigger Time: 352669058.068 [s; MET]
Trigger Stop: 352669058.132 [s; MET]
UTC: 2012-03-05T19:37:30.107140 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 47.5464362623518 Dec: 28.4934691193433 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 18.18
Image Trigger?: NO
Rate S/N Ratio: 186.566342087741 [ if not an image trigger ]
Image S/N Ratio: 18.18
Flight Position: [ source = BAT ]
RA: 47.5464362623518 Dec: 28.4934691193433 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 47.5490139018006 Dec: 28.4949680401155 [deg; J2000]
{ 03h 10m 11.8s , +28d 29' 41.9" }
+/- 0.925678708370968 [arcmin] (estimated 90% radius based on SNR)
+/- 0.27727904096902 [arcmin] (formal 1-sigma fit error)
SNR: 33.9650511865855
Angular difference between Flight and Ground position is 0.162984 arcmin
Partial Coding Fraction: 0.921875 [ including projection effects ]
Duration
T90: 0.0999999046325684 +/- 0.0160000324249268
Measured from: 0.00400012731552124
to: 0.10400003194809 [s; relative to TRIGTIME]
T50: 0.0279999375343323 +/- 0.00894429003608426
Measured from: 0.0200001001358032
to: 0.0480000376701355 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.430000007152557
to: 0.569999992847443 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.135999977588654 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.051692 0.099923 0.100157 0.033847
0.003576 0.004749 0.005188 0.004107 [error]
Peak 0.054271 0.104341 0.103649 0.031963
0.005819 0.006675 0.006715 0.005611 [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 1.48e-08 3.70e-08 7.43e-08 3.73e-07 2.01e-07 4.98e-07 erg/cm2
Error 1.40e-09 2.14e-09 4.68e-09 5.21e-08 1.23e-08 5.52e-08 erg/cm2
Peak flux Power-law 5.10e-01 6.77e-01 6.60e-01 1.15e+00 2.22e+00 3.00e+00 ph/cm2/s
Error 6.78e-02 5.44e-02 5.17e-02 1.95e-01 1.52e-01 2.34e-01 ph/cm2/s
Fluence Cutoff-PL 1.39e-08 3.84e-08 7.67e-08 2.24e-07 3.53e-07 0.00e+00 erg/cm2
Error 1.67e-09 2.57e-09 5.37e-09 1.30e-07 1.30e-07 0.00e+00 erg/cm2
Peak flux Cutoff-PL 4.85e-01 6.90e-01 6.76e-01 8.77e-01 2.20e+00 2.73e+00 ph/cm2/s
Error 8.18e-02 6.06e-02 4.58e-02 3.39e-01 1.57e-01 4.19e-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 0.995 0.089 - - 1.36e-01 7.08e-03 64.210 57
CPL 0.653 0.355 209.7 2558.0 1.99e-01 7.91e-02 61.290 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.037 0.119 - - 1.93e-02 1.31e-03 51.700 57
CPL 0.805 0.389 278.2 0.0 2.49e-02 1.17e-02 50.910 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: 0.064000 sec.
T50 in the 50-300 keV band: 0.064000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.136 0.000 0.136
T90 0.100 0.004 0.104
T50 0.028 0.020 0.048
Peak 1.000 -0.430 0.570
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
47.5490 +28.4950 0.0057 11.3 109.6 0.2973 34.0 TRIG_00516997
------------------------------------------
Foreground time interval of the image:
0.000 0.136 (delta_t = 0.136 [sec])
Background time interval of the image:
-239.068 -26.098 (delta_t = 212.970 [sec])
-25.068 0.000 (delta_t = 25.068 [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 0.000 sec. to 0.136 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.995426 ( -0.0888868 0.0884546 )
Norm@50keV : 0.136152 ( -0.00707993 0.00707952 )
------------------------------------------------------------
# Chi-Squared = 64.21 using 59 PHA bins.
# Reduced chi-squared = 1.126 for 57 degrees of freedom
# Null hypothesis probability = 2.387848e-01
Photon flux (15-150 keV) in 0.136 sec: 15.6716 ( -0.815211 0.815827 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.00537e-07 ( -1.22694e-08 1.23772e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.136 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.653321 ( -0.371977 0.338099 )
Epeak [keV] : 209.740 ( -82.5324 5033.41 )
Norm@50keV : 0.199312 ( -0.059673 0.0985386 )
------------------------------------------------------------
# Chi-Squared = 61.29 using 59 PHA bins.
# Reduced chi-squared = 1.094 for 56 degrees of freedom
# Null hypothesis probability = 2.921549e-01
Photon flux (15-150 keV) in 0.136 sec: 15.4964 ( -0.8373 0.835 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.53067e-07 ( 0 0 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.136 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.32693 ( -14.4496 -4.70754 )
beta : -1.10893 ( -0.123254 0.122052 )
Epeak [keV] : 30.6543 ( -5.87994 47.1307 )
Norm@50keV : 1058.32 ( -1042.88 218.508 )
------------------------------------------------------------
# Chi-Squared = 56.42 using 59 PHA bins.
# Reduced chi-squared = 1.026 for 55 degrees of freedom
# Null hypothesis probability = 4.215961e-01
Photon flux (15-150 keV) in 0.136 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] : 19.9055 ( )
R^2/D10^2 : 0.774317 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 116.41 using 59 PHA bins.
# Reduced chi-squared = 2.0423 for 57 degrees of freedom
# Null hypothesis probability = 5.839116e-06
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.059e-09 7.582e-10
25- 50 4.002e-08 2.625e-09
50-150 1.175e-07 1.133e-08
15-150 1.655e-07 1.129e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 ( )
Norm : 59.8749 ( )
------------------------------------------------------------
# Chi-Squared = 155.21 using 59 PHA bins.
# Reduced chi-squared = 2.7229 for 57 degrees of freedom
# Null hypothesis probability = 4.965227e-11
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.028e-08 1.056e-08
25- 50 3.900e-08 2.034e-08
50-150 8.555e-08 4.461e-08
15-150 1.448e-07 7.541e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.71215 (-2.15616 2.50025)
R1^2/D10^2 : 4.29786 (-1.84763 4.08337)
kT2 [keV] : 39.5616 (-9.878 30.8495)
R2^2/D10^2 : 7.44406E-02 (-0.0575963 0.11064)
------------------------------------------------------------
# Chi-Squared = 58.92 using 59 PHA bins.
# Reduced chi-squared = 1.071 for 55 degrees of freedom
# Null hypothesis probability = 3.340686e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.317e-08 2.802e-09
25- 50 4.050e-08 8.507e-09
50-150 1.448e-07 5.713e-08
15-150 1.985e-07 6.982e-08
Peak spectrum fit
Power-law model
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.03694 ( -0.11996 0.118534 )
Norm@50keV : 1.92794E-02 ( -0.00130743 0.00130732 )
------------------------------------------------------------
# Chi-Squared = 51.70 using 59 PHA bins.
# Reduced chi-squared = 0.9070 for 57 degrees of freedom
# Null hypothesis probability = 6.736521e-01
Photon flux (15-150 keV) in 1 sec: 2.22462 ( -0.152373 0.152432 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.05813e-07 ( -1.6031e-08 1.61365e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.805276 ( -0.488107 0.288929 )
Epeak [keV] : 278.153 ( -278.164 -278.164 )
Norm@50keV : 2.48554E-02 ( -0.00655744 0.0167834 )
------------------------------------------------------------
# Chi-Squared = 50.91 using 59 PHA bins.
# Reduced chi-squared = 0.9091 for 56 degrees of freedom
# Null hypothesis probability = 6.674224e-01
Photon flux (15-150 keV) in 1 sec: 2.20447 ( -0.15733 0.15706 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.91557e-07 ( -1.20391e-07 1.64939e-07 ) ergs/cm2
Band function
Time interval is from -0.430 sec. to 0.570 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99379 ( -319.425 -309.425 )
beta : -1.12319 ( -0.140022 0.137146 )
Epeak [keV] : 28.0422 ( -8.29023 5.95957 )
Norm@50keV : 700.999 ( -701.001 4192.09 )
------------------------------------------------------------
# Chi-Squared = 48.18 using 59 PHA bins.
# Reduced chi-squared = 0.8761 for 55 degrees of freedom
# Null hypothesis probability = 7.306089e-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] : 20.1401 (-1.88102 2.14221)
R^2/D10^2 : 0.103705 (-0.0281964 0.037747)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 87.53 using 59 PHA bins.
# Reduced chi-squared = 1.536 for 57 degrees of freedom
# Null hypothesis probability = 5.766793e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.086e-09 1.201e-09
25- 50 4.047e-08 4.060e-09
50-150 1.218e-07 1.550e-08
15-150 1.703e-07 1.650e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.996 ( )
Norm : 8.81843 (-0.62264 0.62264)
------------------------------------------------------------
# Chi-Squared = 97.76 using 59 PHA bins.
# Reduced chi-squared = 1.715 for 57 degrees of freedom
# Null hypothesis probability = 6.340549e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.195e-08 1.151e-08
25- 50 4.223e-08 2.207e-08
50-150 9.261e-08 4.842e-08
15-150 1.568e-07 8.190e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 9.15360 (-2.45733 3.03443)
R1^2/D10^2 : 0.747510 (-0.39548 1.09342)
kT2 [keV] : 38.4580 (-10.4697 40.3086)
R2^2/D10^2 : 1.14589E-02 (-0.00961532 0.0202428)
------------------------------------------------------------
# Chi-Squared = 49.79 using 59 PHA bins.
# Reduced chi-squared = 0.9052 for 55 degrees of freedom
# Null hypothesis probability = 6.734885e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.455e-08 4.484e-09
25- 50 4.199e-08 1.212e-08
50-150 1.487e-07 6.913e-08
15-150 2.052e-07 7.931e-08
Plot creation:
Tue Mar 6 12:13:49 EST 2012