batgrbproduct Analysis for Trigger=426114
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 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Mon Jun 28 23:48:06 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger426114/GCN5_download_cron
======================================================================
Trigger: 00426114 Segment: 000
BAT Trigger Time: 299405806.764 [s; MET]
Trigger Stop: 299405806.796 [s; MET]
UTC: 2010-06-28T08:16:40.830060 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 225.967631752 Dec: -31.6607579182113 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.88
Image Trigger?: NO
Rate S/N Ratio: 31.7647603485372 [ if not an image trigger ]
Image S/N Ratio: 9.88
Flight Position: [ source = BAT ]
RA: 225.967631752 Dec: -31.6607579182113 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 225.942602966914 Dec: -31.6528883307366 [deg; J2000]
{ 15h 03m 46.2s , -31d 39' 10.4" }
+/- 2.06835036214255 [arcmin] (estimated 90% radius based on SNR)
+/- 0.884894781843454 [arcmin] (formal 1-sigma fit error)
SNR: 10.7702751639796
Angular difference between Flight and Ground position is 1.362700 arcmin
Partial Coding Fraction: 0.703125 [ including projection effects ]
Duration
T90: 0.0359999537467957 +/- 0.00894429003608426
Measured from: -0.00399988889694214
to: 0.0320000648498535 [s; relative to TRIGTIME]
T50: 0.0199999213218689 +/- 0.00565686571343518
Measured from: 0.00400012731552124
to: 0.0240000486373901 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.48199999332428
to: 0.51800000667572 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00400000810623169
to: 0.0360000133514404 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006600 0.012844 0.023566 0.003260
0.001783 0.002253 0.002784 0.001871 [error]
Peak -0.004181 0.017957 0.037311 0.009833
0.006524 0.006677 0.006375 0.005575 [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 2.14e-09 4.57e-09 7.63e-09 2.90e-08 2.10e-08 4.34e-08 erg/cm2
Error 5.94e-10 9.21e-10 1.76e-09 1.23e-08 4.56e-09 1.41e-08 erg/cm2
Peak flux Power-law 6.69e-02 1.20e-01 1.67e-01 4.81e-01 4.80e-01 8.34e-01 ph/cm2/s
Error 4.62e-02 5.30e-02 4.71e-02 2.74e-01 1.46e-01 2.82e-01 ph/cm2/s
Fluence Cutoff-PL 7.24e-10 5.80e-09 1.38e-08 5.16e-09 2.47e-08 2.54e-08 erg/cm2
Error 7.60e-10 1.62e-09 3.70e-09 3.60e-09 4.90e-09 5.53e-09 erg/cm2
Peak flux Cutoff-PL 6.07e-04 4.52e-02 2.80e-01 3.87e-01 0.00e+00 0.00e+00 ph/cm2/s
Error 4.69e-03 3.55e-02 6.97e-02 9.53e-02 0.00e+00 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 4.41e-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 1.259 0.248 - - 5.26e-02 1.04e-02 81.300 57
CPL -2.674 2.772 74.2 10.4 2.29e+00 1.73e+01 60.470 56
The chi2 of BB fit is 60.96 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 0.529 0.496 - - 4.07e-03 1.38e-03 74.270 57
CPL -9.978 0.000 84.4 9.9 4.88e+00 3.17e+00 63.400 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 0.040 -0.004 0.036
T90 0.036 -0.004 0.032
T50 0.020 0.004 0.024
Peak 1.000 -0.482 0.518
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
225.9426 -31.6529 0.0178 25.7 25.8 0.0489 10.8 TRIG_00426114
------------------------------------------
Foreground time interval of the image:
-0.004 0.036 (delta_t = 0.040 [sec])
Background time interval of the image:
-239.764 -0.004 (delta_t = 239.760 [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 -0.004 sec. to 0.036 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25947 ( -0.241077 0.254487 )
Norm@50keV : 5.25679E-02 ( -0.0104586 0.0104289 )
------------------------------------------------------------
# Chi-Squared = 81.30 using 59 PHA bins.
# Reduced chi-squared = 1.426 for 57 degrees of freedom
# Null hypothesis probability = 1.899180e-02
Photon flux (15-150 keV) in 0.04 sec: 6.22725 ( -1.22315 1.22343 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.09854e-08 ( -4.54324e-09 4.58012e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.004 sec. to 0.036 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -2.67418 ( -3.69704 1.84695 )
Epeak [keV] : 74.2410 ( -8.8053 11.9818 )
Norm@50keV : 2.28537 ( -2.35946 32.2999 )
------------------------------------------------------------
# Chi-Squared = 60.47 using 59 PHA bins.
# Reduced chi-squared = 1.080 for 56 degrees of freedom
# Null hypothesis probability = 3.178022e-01
Photon flux (15-150 keV) in 0.04 sec: 6.58243 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.46662e-08 ( -4.86172e-09 4.94176e-09 ) ergs/cm2
Band function
Time interval is from -0.004 sec. to 0.036 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 2.74916 ( -1.50825 -2.33141 )
beta : -9.99997 ( 91666.6 91676.6 )
Epeak [keV] : 73.6573 ( -8.34012 12.5014 )
Norm@50keV : 2.48306 ( -2.48747 8.9247 )
------------------------------------------------------------
# Chi-Squared = 60.47 using 59 PHA bins.
# Reduced chi-squared = 1.100 for 55 degrees of freedom
# Null hypothesis probability = 2.847878e-01
Photon flux (15-150 keV) in 0.04 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] : 19.7983 (-2.64718 2.9258)
R^2/D10^2 : 0.399152 (-0.15036 0.230461)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.96 using 59 PHA bins.
# Reduced chi-squared = 1.069 for 57 degrees of freedom
# Null hypothesis probability = 3.356220e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.211e-09 3.588e-10
25- 50 5.993e-09 1.651e-09
50-150 1.739e-08 5.336e-09
15-150 2.459e-08 5.606e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.998 ( )
Norm : 25.4807 (-25.4807 -25.4807)
------------------------------------------------------------
# Chi-Squared = 81.70 using 59 PHA bins.
# Reduced chi-squared = 1.433 for 57 degrees of freedom
# Null hypothesis probability = 1.765544e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.537e-09 1.481e-09
25- 50 4.881e-09 2.770e-09
50-150 1.071e-08 6.082e-09
15-150 1.812e-08 1.035e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.49786 ( )
R1^2/D10^2 : 8.51133 (-8.00211 -8.00211)
kT2 [keV] : 19.9680 (-2.80521 3.53535)
R2^2/D10^2 : 0.384052 (-0.381914 0.242614)
------------------------------------------------------------
# Chi-Squared = 60.96 using 59 PHA bins.
# Chi-Squared = 60.86 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Reduced chi-squared = 1.107 for 55 degrees of freedom
# Null hypothesis probability = 2.703737e-01
# Null hypothesis probability = 2.731928e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.529160 ( -0.534729 0.456704 )
Norm@50keV : 4.06876E-03 ( -0.00139795 0.00136491 )
------------------------------------------------------------
# Chi-Squared = 74.27 using 59 PHA bins.
# Reduced chi-squared = 1.303 for 57 degrees of freedom
# Null hypothesis probability = 6.186330e-02
Photon flux (15-150 keV) in 1 sec: 0.480167 ( -0.14379 0.148031 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.38977e-08 ( -1.53894e-08 1.5487e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -9.97806 ( )
Epeak [keV] : 84.4030 ( -9.72186 10.1044 )
Norm@50keV : 4.87957 ( -4.94335 1.40576 )
------------------------------------------------------------
# Chi-Squared = 63.40 using 59 PHA bins.
# Reduced chi-squared = 1.132 for 56 degrees of freedom
# Null hypothesis probability = 2.319121e-01
Photon flux (15-150 keV) in 1 sec: ( ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.482 sec. to 0.518 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.99960 ( -4752.16 -4749 )
beta : -9.37167 ( 10 19.9999 )
Epeak [keV] : 89.9218 ( -13.6622 16.0535 )
Norm@50keV : 0.250141 ( -0.157029 0.415597 )
------------------------------------------------------------
# Chi-Squared = 65.73 using 59 PHA bins.
# Reduced chi-squared = 1.195 for 55 degrees of freedom
# Null hypothesis probability = 1.524717e-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] : 28.4864 (-6.8823 12.4732)
R^2/D10^2 : 9.62456E-03 (-0.00963698 0.0126441)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 69.12 using 59 PHA bins.
# Reduced chi-squared = 1.213 for 57 degrees of freedom
# Null hypothesis probability = 1.302427e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.261e-09 7.895e-10
25- 50 7.608e-09 4.554e-09
50-150 4.442e-08 2.686e-08
15-150 5.329e-08 3.023e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.999 ( )
Norm : 1.83562 (-1.83562 -1.83562)
------------------------------------------------------------
# Chi-Squared = 86.45 using 59 PHA bins.
# Reduced chi-squared = 1.517 for 57 degrees of freedom
# Null hypothesis probability = 7.157356e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 4.569e-09 2.897e-09
25- 50 8.790e-09 5.630e-09
50-150 1.928e-08 1.225e-08
15-150 3.264e-08 2.051e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.119164 (-0.119164 -0.119164)
R1^2/D10^2 : 2.92960E-02 (-0.029296 -0.029296)
kT2 [keV] : 28.4766 (-6.8857 12.4698)
R2^2/D10^2 : 9.63479E-03 (-0.00963479 0.0126463)
------------------------------------------------------------
# Chi-Squared = 69.12 using 59 PHA bins.
# Reduced chi-squared = 1.257 for 55 degrees of freedom
# Null hypothesis probability = 9.535088e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Tue Jun 29 00:07:40 EDT 2010