batgrbproduct Analysis for Trigger=424998
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Sat Jun 19 16:38:00 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger424998/GCN5_download_cron
======================================================================
Trigger: 00424998 Segment: 000
BAT Trigger Time: 298599673.152 [s; MET]
Trigger Stop: 298599673.408 [s; MET]
UTC: 2010-06-19T00:21:07.246620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 84.6155727820155 Dec: -27.000942273695 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.94
Image Trigger?: NO
Rate S/N Ratio: 16.4924225024706 [ if not an image trigger ]
Image S/N Ratio: 7.94
Flight Position: [ source = BAT ]
RA: 84.6155727820155 Dec: -27.000942273695 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 84.6177447053521 Dec: -27.0116518916702 [deg; J2000]
{ 05h 38m 28.3s , -27d 00' 41.9" }
+/- 0.972915250251164 [arcmin] (estimated 90% radius based on SNR)
+/- 0.333889737459955 [arcmin] (formal 1-sigma fit error)
SNR: 31.633997696672
Angular difference between Flight and Ground position is 0.652982 arcmin
Partial Coding Fraction: 0.7578125 [ including projection effects ]
Duration
T90: 97.5479999780655 +/- 1.49925317864576
Measured from: 0.28000009059906
to: 97.8280000686646 [s; relative to TRIGTIME]
T50: 81.5839999318123 +/- 0.424414908814375
Measured from: 7.56800013780594
to: 89.1520000696182 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 87.2199999690056
to: 88.2199999690056 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.94800001382828
to: 105.652000010014 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 2.645997 2.993649 1.896800 0.374955
0.063216 0.065897 0.058202 0.050846 [error]
Peak 0.175862 0.218486 0.140833 0.028872
0.007865 0.008490 0.007323 0.005169 [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 8.61e-07 1.29e-06 1.46e-06 3.11e-06 4.55e-06 6.73e-06 erg/cm2
Error 4.81e-08 4.08e-08 6.06e-08 2.90e-07 1.41e-07 3.28e-07 erg/cm2
Peak flux Power-law 1.87e+00 1.63e+00 9.73e-01 8.74e-01 4.84e+00 5.34e+00 ph/cm2/s
Error 1.14e-01 6.68e-02 5.96e-02 1.03e-01 1.98e-01 2.24e-01 ph/cm2/s
Fluence Cutoff-PL 8.44e-07 1.30e-06 1.46e-06 2.71e-06 4.51e-06 6.30e-06 erg/cm2
Error 5.36e-08 4.52e-08 6.39e-08 6.41e-07 1.60e-07 6.50e-07 erg/cm2
Peak flux Cutoff-PL 1.85e+00 1.64e+00 9.78e-01 7.85e-01 4.84e+00 5.26e+00 ph/cm2/s
Error 1.25e-01 8.28e-02 4.63e-02 1.98e-01 2.90e-01 0.00e+00 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 1.830 0.059 - - 4.55e-03 1.39e-04 45.300 57
CPL 1.708 0.193 123.0 -37.3 5.21e-03 1.12e-03 44.850 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.743 0.071 - - 3.59e-02 1.69e-03 51.180 57
CPL 1.665 0.201 199.1 0.0 3.96e-02 0.00e+00 50.900 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: 96.128000 sec.
T50 in the 50-300 keV band: 83.648000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 108.600 -2.948 105.652
T90 97.548 0.280 97.828
T50 81.584 7.568 89.152
Peak 1.000 87.220 88.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
84.6177 -27.0117 0.0061 31.6 178.0 2.5205 31.6 TRIG_00424998
------------------------------------------
Foreground time interval of the image:
-2.948 10.149 (delta_t = 13.097 [sec])
Background time interval of the image:
-11.051 -2.948 (delta_t = 8.103 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 -2.948 sec. to 105.652 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82954 ( -0.059259 0.0597074 )
Norm@50keV : 4.55352E-03 ( -0.000139086 0.000138625 )
------------------------------------------------------------
# Chi-Squared = 45.30 using 59 PHA bins.
# Reduced chi-squared = 0.7947 for 57 degrees of freedom
# Null hypothesis probability = 8.682200e-01
Photon flux (15-150 keV) in 108.6 sec: 0.634796 ( -0.0208574 0.0209544 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.54861e-06 ( -1.40361e-07 1.40811e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.948 sec. to 105.652 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70848 ( -0.212906 0.172842 )
Epeak [keV] : 122.954 ( -51.0884 -125.59 )
Norm@50keV : 5.20990E-03 ( -0.000856628 0.00137393 )
------------------------------------------------------------
# Chi-Squared = 44.85 using 59 PHA bins.
# Reduced chi-squared = 0.8009 for 56 degrees of freedom
# Null hypothesis probability = 8.574745e-01
Photon flux (15-150 keV) in 108.6 sec: 0.629557 ( -0.024009 0.022548 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.51361e-06 ( -1.65267e-07 1.55233e-07 ) ergs/cm2
Band function
Time interval is from -2.948 sec. to 105.652 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74156 ( 1.40367 3.5091 )
beta : -2.24864 ( 7.1126 5.33671 )
Epeak [keV] : 151.011 ( -62.1434 -151.007 )
Norm@50keV : 5.02236E-03 ( -0.000146861 0.000401068 )
------------------------------------------------------------
# Chi-Squared = 44.81 using 59 PHA bins.
# Reduced chi-squared = 0.8147 for 55 degrees of freedom
# Null hypothesis probability = 8.350990e-01
Photon flux (15-150 keV) in 108.6 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] : 13.3243 ( )
R^2/D10^2 : 9.55673E-02 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 315.10 using 59 PHA bins.
# Reduced chi-squared = 5.5280 for 57 degrees of freedom
# Null hypothesis probability = 2.139941e-37
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.905e-07 2.123e-08
25- 50 1.381e-06 4.724e-08
50-150 1.572e-06 9.502e-08
15-150 3.343e-06 1.162e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 110.181 (-2.84901 25.9235)
Norm : 2.65909 (-0.121876 0.130958)
------------------------------------------------------------
# Chi-Squared = 53.89 using 59 PHA bins.
# Reduced chi-squared = 0.9454 for 57 degrees of freedom
# Null hypothesis probability = 5.926370e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.541e-07 3.475e-08
25- 50 1.329e-06 4.507e-08
50-150 2.270e-06 1.037e-07
15-150 4.353e-06 1.401e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.58823 (-0.680091 0.71923)
R1^2/D10^2 : 0.929186 (-0.29125 0.47897)
kT2 [keV] : 24.0630 (-2.47097 3.23919)
R2^2/D10^2 : 8.34600E-03 (-0.00316255 0.00438273)
------------------------------------------------------------
# Chi-Squared = 56.15 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.313809e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.508e-07 7.173e-08
25- 50 1.316e-06 7.982e-08
50-150 2.336e-06 2.215e-07
15-150 4.403e-06 3.177e-07
Peak spectrum fit
Power-law model
Time interval is from 87.220 sec. to 88.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.74317 ( -0.0707859 0.0720099 )
Norm@50keV : 3.59069E-02 ( -0.00169318 0.00167867 )
------------------------------------------------------------
# Chi-Squared = 51.18 using 59 PHA bins.
# Reduced chi-squared = 0.8979 for 57 degrees of freedom
# Null hypothesis probability = 6.919916e-01
Photon flux (15-150 keV) in 1 sec: 4.84306 ( -0.198398 0.198405 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.31459e-07 ( -1.627e-08 1.63403e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 87.220 sec. to 88.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66517 ( -0.259692 0.142106 )
Epeak [keV] : 199.065 ( )
Norm@50keV : 3.96333E-02 ( )
------------------------------------------------------------
# Chi-Squared = 50.90 using 59 PHA bins.
# Reduced chi-squared = 0.9089 for 56 degrees of freedom
# Null hypothesis probability = 6.679274e-01
Photon flux (15-150 keV) in 1 sec: 4.83506 ( -0.19768 0.19928 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.29838e-07 ( -1.6557e-08 1.6941e-08 ) ergs/cm2
Band function
Time interval is from 87.220 sec. to 88.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.53686 ( 1.40639 6.1952 )
beta : -1.78451 ( -0.698841 0.117039 )
Epeak [keV] : 78.0891 ( -59.2169 -59.2169 )
Norm@50keV : 4.85582E-02 ( -0.0143327 11675.5 )
------------------------------------------------------------
# Chi-Squared = 50.75 using 59 PHA bins.
# Reduced chi-squared = 0.9227 for 55 degrees of freedom
# Null hypothesis probability = 6.376932e-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] : 11.5713 ( )
R^2/D10^2 : 1.34249 ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 247.01 using 59 PHA bins.
# Reduced chi-squared = 4.3334 for 57 degrees of freedom
# Null hypothesis probability = 1.714493e-25
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.787e-08 2.720e-09
25- 50 1.141e-07 5.600e-09
50-150 8.959e-08 9.760e-09
15-150 2.416e-07 1.250e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 119.153 (-0.0704638 44.0084)
Norm : 20.7655 (-1.07757 1.15715)
------------------------------------------------------------
# Chi-Squared = 56.59 using 59 PHA bins.
# Reduced chi-squared = 0.9929 for 57 degrees of freedom
# Null hypothesis probability = 4.902692e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.410e-08 3.105e-09
25- 50 9.667e-08 4.150e-09
50-150 1.719e-07 1.310e-08
15-150 3.227e-07 1.590e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.19243 (-0.685966 0.711433)
R1^2/D10^2 : 9.43578 (-2.97012 4.94239)
kT2 [keV] : 24.8070 (-3.08038 4.08377)
R2^2/D10^2 : 6.32773E-02 (-0.0268035 0.0408624)
------------------------------------------------------------
# Chi-Squared = 57.37 using 59 PHA bins.
# Reduced chi-squared = 1.043 for 55 degrees of freedom
# Null hypothesis probability = 3.872466e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.703e-08 5.360e-09
25- 50 9.200e-08 7.650e-09
50-150 1.809e-07 2.715e-08
15-150 3.300e-07 3.050e-08
Plot creation:
Sat Jun 19 17:14:52 EDT 2010