batgrbproduct Analysis for Trigger=429868
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): Sun Jul 25 08:11:23 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger429868/GCN5_download_cron
======================================================================
Trigger: 00429868 Segment: 000
BAT Trigger Time: 301624945.216 [s; MET]
Trigger Stop: 301624946.24 [s; MET]
UTC: 2010-07-24T00:42:19.202780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 194.566197960917 Dec: -11.1213088935374 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.55
Image Trigger?: NO
Rate S/N Ratio: 19.157244060668 [ if not an image trigger ]
Image S/N Ratio: 10.55
Flight Position: [ source = BAT ]
RA: 194.566197960917 Dec: -11.1213088935374 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 194.56888050202 Dec: -11.0946655603152 [deg; J2000]
{ 12h 58m 16.5s , -11d 05' 40.8" }
+/- 1.70443038999972 [arcmin] (estimated 90% radius based on SNR)
+/- 0.653210360693445 [arcmin] (formal 1-sigma fit error)
SNR: 14.2000820153971
Angular difference between Flight and Ground position is 1.606383 arcmin
Partial Coding Fraction: 0.4335938 [ including projection effects ]
Duration
T90: 1.38799995183945 +/- 0.15579471580594
Measured from: 0.148000121116638
to: 1.53600007295609 [s; relative to TRIGTIME]
T50: 0.671999990940094 +/- 0.207460807316148
Measured from: 0.388000071048737
to: 1.06000006198883 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0879999995231628
to: 1.08799999952316 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0839999914169312
to: 1.64800000190735 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.089862 0.124126 0.055556 0.010684
0.010605 0.011417 0.010621 0.009442 [error]
Peak 0.060696 0.097648 0.049607 0.005327
0.008623 0.009442 0.008722 0.007340 [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 3.34e-08 4.74e-08 4.99e-08 9.70e-08 1.61e-07 2.28e-07 erg/cm2
Error 5.26e-09 5.50e-09 9.78e-09 3.71e-08 2.28e-08 4.82e-08 erg/cm2
Peak flux Power-law 7.64e-01 6.33e-01 3.56e-01 2.95e-01 1.88e+00 2.05e+00 ph/cm2/s
Error 1.27e-01 7.73e-02 6.78e-02 1.04e-01 2.30e-01 2.59e-01 ph/cm2/s
Fluence Cutoff-PL 3.00e-08 5.57e-08 4.49e-08 1.28e-08 1.41e-07 1.43e-07 erg/cm2
Error 6.05e-09 8.15e-09 1.27e-08 2.41e-08 3.41e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 6.49e-01 7.81e-01 3.43e-01 4.17e-02 1.81e+00 1.81e+00 ph/cm2/s
Error 1.49e-01 1.15e-01 8.87e-02 2.35e-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 1.925 0.208 - - 1.12e-02 1.62e-03 55.000 57
CPL 0.506 1.162 42.4 11.7 7.65e-02 2.18e-01 49.390 56
The chi2 of BB fit is 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 1.831 0.205 - - 1.35e-02 2.00e-03 53.210 57
CPL -0.006 1.211 45.1 9.4 1.58e-01 4.80e-01 43.720 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 1.564 0.084 1.648
T90 1.388 0.148 1.536
T50 0.672 0.388 1.060
Peak 1.000 0.088 1.088
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
194.5689 -11.0947 0.0136 33.6 38.5 0.3047 14.2 TRIG_00429868
------------------------------------------
Foreground time interval of the image:
0.084 1.648 (delta_t = 1.564 [sec])
Background time interval of the image:
-239.216 0.084 (delta_t = 239.300 [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 0.084 sec. to 1.648 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92510 ( -0.201597 0.214328 )
Norm@50keV : 1.11965E-02 ( -0.00163481 0.00160089 )
------------------------------------------------------------
# Chi-Squared = 55.00 using 59 PHA bins.
# Reduced chi-squared = 0.9649 for 57 degrees of freedom
# Null hypothesis probability = 5.504122e-01
Photon flux (15-150 keV) in 1.564 sec: 1.62420 ( -0.186869 0.186872 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.61051e-07 ( -2.2553e-08 2.31383e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.084 sec. to 1.648 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.506378 ( -1.27634 1.04726 )
Epeak [keV] : 42.4297 ( -8.21985 15.1071 )
Norm@50keV : 7.64787E-02 ( -0.0764809 0.35979 )
------------------------------------------------------------
# Chi-Squared = 49.39 using 59 PHA bins.
# Reduced chi-squared = 0.8820 for 56 degrees of freedom
# Null hypothesis probability = 7.213704e-01
Photon flux (15-150 keV) in 1.564 sec: 1.55201 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.40797e-07 ( -2.24418e-08 2.57234e-08 ) ergs/cm2
Band function
Time interval is from 0.084 sec. to 1.648 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.803916 ( -0.839283 0.724689 )
beta : -3.02018 ( 3.22617 1.21039 )
Epeak [keV] : 43.8198 ( -17.5379 13.1662 )
Norm@50keV : 5.03623E-02 ( -0.0200539 441.773 )
------------------------------------------------------------
# Chi-Squared = 49.37 using 59 PHA bins.
# Reduced chi-squared = 0.8975 for 55 degrees of freedom
# Null hypothesis probability = 6.888554e-01
Photon flux (15-150 keV) in 1.564 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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Peak spectrum fit
Power-law model
Time interval is from 0.088 sec. to 1.088 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.83132 ( -0.199403 0.211377 )
Norm@50keV : 1.34975E-02 ( -0.00201596 0.00197728 )
------------------------------------------------------------
# Chi-Squared = 53.21 using 59 PHA bins.
# Reduced chi-squared = 0.9335 for 57 degrees of freedom
# Null hypothesis probability = 6.181048e-01
Photon flux (15-150 keV) in 1 sec: 1.88300 ( -0.229948 0.22995 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24146e-07 ( -1.84223e-08 1.8864e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.088 sec. to 1.088 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -6.21421E-03 ( -1.34185 1.07942 )
Epeak [keV] : 45.1123 ( -7.00757 11.8321 )
Norm@50keV : 0.157659 ( -0.157659 0.802252 )
------------------------------------------------------------
# Chi-Squared = 43.72 using 59 PHA bins.
# Reduced chi-squared = 0.7808 for 56 degrees of freedom
# Null hypothesis probability = 8.836619e-01
Photon flux (15-150 keV) in 1 sec: 1.80975 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.07951e-07 ( -1.7298e-08 1.933e-08 ) ergs/cm2
Band function
Time interval is from 0.088 sec. to 1.088 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.59159E-02 ( -0.724945 5.3618 )
beta : -7.98286 ( 5.82837 15.8284 )
Epeak [keV] : 45.1564 ( -14.7975 8.69655 )
Norm@50keV : 0.149511 ( -0.0772429 124.476 )
------------------------------------------------------------
# Chi-Squared = 43.73 using 59 PHA bins.
# Reduced chi-squared = 0.7950 for 55 degrees of freedom
# Null hypothesis probability = 8.630042e-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] : ( )
R^2/D10^2 : ( )
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : ( )
Norm : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : ( )
R1^2/D10^2 : ( )
kT2 [keV] : ( )
R2^2/D10^2 : ( )
------------------------------------------------------------
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25
25- 50
50-150
15-150
Plot creation:
Sun Jul 25 08:27:51 EDT 2010