batgrbproduct Analysis for Trigger=426405
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): Fri Jul 2 11:22:17 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger426405/GCN5_download_cron
======================================================================
Trigger: 00426405 Segment: 000
BAT Trigger Time: 299688946.688 [s; MET]
Trigger Stop: 299688950.784 [s; MET]
UTC: 2010-07-01T14:55:40.743940 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 258.12423007392 Dec: -37.638555572182 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.26
Image Trigger?: NO
Rate S/N Ratio: 6.78232998312527 [ if not an image trigger ]
Image S/N Ratio: 8.26
Flight Position: [ source = BAT ]
RA: 258.12423007392 Dec: -37.638555572182 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 258.133428449551 Dec: -37.6632187614317 [deg; J2000]
{ 17h 12m 32.0s , -37d 39' 47.6" }
+/- 2.15947132265272 [arcmin] (estimated 90% radius based on SNR)
+/- 1.01674826448374 [arcmin] (formal 1-sigma fit error)
SNR: 10.1269619555371
Angular difference between Flight and Ground position is 1.542959 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 15.1279999017715 +/- 2.27599030015451
Measured from: -9.70399987697601
to: 5.42400002479553 [s; relative to TRIGTIME]
T50: 7.72399997711182 +/- 2.99826682363402
Measured from: -5.84399992227554
to: 1.88000005483627 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 1.30799996852875
to: 2.30799996852875 [s; relative to TRIGTIME]
Total Fluence
Measured from: -10.4000000357628
to: 6.32400000095367 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.414489 0.079495 0.001437 0.000679
0.030075 0.025339 0.022091 0.021374 [error]
Peak 0.041198 0.008434 0.005609 -0.001191
0.007618 0.006250 0.005315 0.005262 [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 1.20e-07 3.95e-08 7.29e-09 1.57e-09 1.68e-07 1.68e-07 erg/cm2
Error 1.81e-08 1.34e-08 5.62e-09 2.24e-09 2.86e-08 2.91e-08 erg/cm2
Peak flux Power-law 3.32e-01 1.12e-01 2.12e-02 4.71e-03 4.68e-01 4.69e-01 ph/cm2/s
Error 1.09e-01 5.69e-02 2.33e-02 1.10e-02 1.53e-01 1.54e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-07 3.95e-08 7.27e-09 1.56e-09 1.68e-07 1.68e-07 erg/cm2
Error 1.81e-08 1.34e-08 5.62e-09 2.22e-09 2.86e-08 2.91e-08 erg/cm2
Peak flux Cutoff-PL 4.08e-01 7.71e-02 1.52e-05 1.77e-15 4.85e-01 4.85e-01 ph/cm2/s
Error 1.24e-01 5.37e-02 1.04e-03 1.40e-01 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 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 4.436 0.623 - - 3.26e-04 1.95e-04 46.600 57
CPL 1.000 0.000 50.0 0.0 3.59e-03 0.00e+00 121.360 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 3.397 0.956 - - 1.26e-03 1.26e-03 52.060 57
CPL 1.000 0.000 50.0 0.0 7.79e-03 0.00e+00 63.910 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: 0.000000 sec.
T50 in the 50-300 keV band: 0.000000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 16.724 -10.400 6.324
T90 15.128 -9.704 5.424
T50 7.724 -5.844 1.880
Peak 1.000 1.308 2.308
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
258.1334 -37.6632 0.0189 19.0 153.8 0.5624 10.1 TRIG_00426405
------------------------------------------
Foreground time interval of the image:
-10.400 6.324 (delta_t = 16.724 [sec])
Background time interval of the image:
-119.688 -89.648 (delta_t = 30.040 [sec])
-88.688 -10.400 (delta_t = 78.288 [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 -10.400 sec. to 6.324 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.43601 ( -0.574255 0.67102 )
Norm@50keV : 3.26005E-04 ( -0.00016124 0.000229568 )
------------------------------------------------------------
# Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8175 for 57 degrees of freedom
# Null hypothesis probability = 8.357785e-01
Photon flux (15-150 keV) in 16.72 sec: 0.296872 ( -0.0438845 0.0439117 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67646e-07 ( -2.80119e-08 2.92515e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -10.400 sec. to 6.324 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.58960E-03 ( )
------------------------------------------------------------
# Chi-Squared = 121.36 using 59 PHA bins.
# Reduced chi-squared = 2.1671 for 56 degrees of freedom
# Null hypothesis probability = 9.980399e-07
Photon flux (15-150 keV) in 16.72 sec: 0.296652 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67608e-07 ( -2.8015e-08 2.92533e-08 ) ergs/cm2
Band function
Time interval is from -10.400 sec. to 6.324 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -2.18999 ( 2.18999 2.18999 )
beta : -4.43814 ( -0.66899 0.576319 )
Epeak [keV] : 5.63551 ( -5.63551 -5.63551 )
Norm@50keV : 3.29074 ( -3.29073 16.8355 )
------------------------------------------------------------
# Chi-Squared = 46.60 using 59 PHA bins.
# Reduced chi-squared = 0.8472 for 55 degrees of freedom
# Null hypothesis probability = 7.827496e-01
Photon flux (15-150 keV) in 16.72 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] : 3.18798 (-0.439977 0.528486)
R^2/D10^2 : 28.1891 (-17.0218 45.0321)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 47.54 using 59 PHA bins.
# Reduced chi-squared = 0.8341 for 57 degrees of freedom
# Null hypothesis probability = 8.096262e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.273e-07 4.836e-08
25- 50 2.282e-08 1.026e-08
50-150 5.932e-11 5.497e-11
15-150 1.502e-07 6.378e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 7.02042 (-1.60337 2.31445)
Norm : 23.3481 (-11.8946 27.0164)
------------------------------------------------------------
# Chi-Squared = 46.73 using 59 PHA bins.
# Reduced chi-squared = 0.8199 for 57 degrees of freedom
# Null hypothesis probability = 8.321603e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.242e-07 3.841e-08
25- 50 3.098e-08 1.457e-08
50-150 6.937e-10 6.284e-10
15-150 1.558e-07 5.241e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 2.82233 (-1.42262 0.62227)
R1^2/D10^2 : 53.6315 (-37.2155 295.897)
kT2 [keV] : 8.85614 (-9.087 -9.087)
R2^2/D10^2 : 4.21702E-02 (-0.0402388 32.9403)
------------------------------------------------------------
# Chi-Squared = 44.93 using 59 PHA bins.
# Reduced chi-squared = 0.8168 for 55 degrees of freedom
# Null hypothesis probability = 8.318884e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.243e-07 6.629e-08
25- 50 3.543e-08 1.929e-08
50-150 8.043e-09 6.084e-09
15-150 1.677e-07 8.485e-08
Peak spectrum fit
Power-law model
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 3.39738 ( -0.826747 1.08492 )
Norm@50keV : 1.25521E-03 ( -0.00125469 0.00125792 )
------------------------------------------------------------
# Chi-Squared = 52.06 using 59 PHA bins.
# Reduced chi-squared = 0.9133 for 57 degrees of freedom
# Null hypothesis probability = 6.605310e-01
Photon flux (15-150 keV) in 1 sec: 0.467705 ( -0.152135 0.153651 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.85786e-08 ( -7.19537e-09 8.58122e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 7.79153E-03 ( )
------------------------------------------------------------
# Chi-Squared = 63.91 using 59 PHA bins.
# Reduced chi-squared = 1.141 for 56 degrees of freedom
# Null hypothesis probability = 2.185964e-01
Photon flux (15-150 keV) in 1 sec: 0.484839 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61228e-08 ( -4.7648e-09 4.8573e-09 ) ergs/cm2
Band function
Time interval is from 1.308 sec. to 2.308 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.15636 ( 0.0251181 0.0251181 )
beta : -7.40703 ( 181.293 191.293 )
Epeak [keV] : 16.5208 ( -7.89837 8.97975 )
Norm@50keV : 346.471 ( -346.448 13235.5 )
------------------------------------------------------------
# Chi-Squared = 48.38 using 59 PHA bins.
# Reduced chi-squared = 0.8796 for 55 degrees of freedom
# Null hypothesis probability = 7.237791e-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] : 4.11919 (-0.907334 1.13696)
R^2/D10^2 : 11.0699 (-7.86751 29.7958)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 48.81 using 59 PHA bins.
# Reduced chi-squared = 0.8563 for 57 degrees of freedom
# Null hypothesis probability = 7.715899e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.159e-08 7.140e-09
25- 50 4.545e-09 2.970e-09
50-150 6.579e-11 7.055e-11
15-150 1.620e-08 9.780e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 10.7007 (-4.17229 9.03817)
Norm : 14.2598 (-8.71691 26.1138)
------------------------------------------------------------
# Chi-Squared = 50.72 using 59 PHA bins.
# Reduced chi-squared = 0.8897 for 57 degrees of freedom
# Null hypothesis probability = 7.083911e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.076e-08 6.700e-09
25- 50 5.060e-09 3.555e-09
50-150 4.153e-10 4.494e-10
15-150 1.623e-08 9.985e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.99962 (-0.901452 1.13294)
R1^2/D10^2 : 12.4868 (-8.96314 35.5221)
kT2 [keV] : 36.8570 (-37.6454 -37.6454)
R2^2/D10^2 : 6.70810E-04 (-0.000626498 30.7068)
------------------------------------------------------------
# Chi-Squared = 47.83 using 59 PHA bins.
# Reduced chi-squared = 0.8696 for 55 degrees of freedom
# Null hypothesis probability = 7.427871e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.148e-08 6.700e-09
25- 50 4.926e-09 2.910e-09
50-150 7.180e-09 5.940e-09
15-150 2.358e-08 1.444e-08
Plot creation:
Fri Jul 2 11:36:00 EDT 2010