batgrbproduct Analysis for Trigger=429954
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 20:09:29 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger429954/GCN5_download_cron
======================================================================
Trigger: 00429954 Segment: 000
BAT Trigger Time: 301734778.432 [s; MET]
Trigger Stop: 301734779.456 [s; MET]
UTC: 2010-07-25T07:12:52.414860 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 166.514988339174 Dec: -26.6876315703796 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.66
Image Trigger?: NO
Rate S/N Ratio: 24.6576560118759 [ if not an image trigger ]
Image S/N Ratio: 6.66
Flight Position: [ source = BAT ]
RA: 166.514988339174 Dec: -26.6876315703796 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 166.467758123957 Dec: -26.6667567669792 [deg; J2000]
{ 11h 05m 52.3s , -26d 40' 00.3" }
+/- 1.17796239341779 [arcmin] (estimated 90% radius based on SNR)
+/- 0.472234991250856 [arcmin] (formal 1-sigma fit error)
SNR: 24.0714392278421
Angular difference between Flight and Ground position is 2.824983 arcmin
Partial Coding Fraction: 0.8203125 [ including projection effects ]
Duration
T90: 140.899999916553 +/- 26.6855793227588
Measured from: -0.103999853134155
to: 140.796000063419 [s; relative to TRIGTIME]
T50: 54.8639999032021 +/- 9.91098403685653
Measured from: 8.55200016498566
to: 63.4160000681877 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 8.58399999141693
to: 9.58399999141693 [s; relative to TRIGTIME]
Total Fluence
Measured from: -4.75599998235703
to: 171.952000021935 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.649919 1.023189 0.946846 0.373632
0.061225 0.063271 0.056301 0.049408 [error]
Peak 0.014665 0.030981 0.026851 0.023335
0.005175 0.005566 0.005226 0.004604 [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 2.02e-07 4.37e-07 7.43e-07 2.90e-06 2.04e-06 4.28e-06 erg/cm2
Error 2.64e-08 3.28e-08 5.53e-08 5.10e-07 1.39e-07 5.36e-07 erg/cm2
Peak flux Power-law 1.65e-01 2.11e-01 1.97e-01 3.23e-01 6.81e-01 8.95e-01 ph/cm2/s
Error 6.42e-02 4.92e-02 4.16e-02 1.54e-01 1.32e-01 1.82e-01 ph/cm2/s
Fluence Cutoff-PL 2.02e-07 4.37e-07 7.43e-07 2.88e-06 2.04e-06 4.07e-06 erg/cm2
Error 2.64e-08 3.29e-08 5.54e-08 5.07e-07 1.39e-07 7.56e-07 erg/cm2
Peak flux Cutoff-PL 1.65e-01 2.11e-01 1.97e-01 3.21e-01 6.81e-01 8.93e-01 ph/cm2/s
Error 6.42e-02 4.93e-02 4.16e-02 1.82e-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 1.234 0.119 - - 1.15e-03 7.19e-05 49.130 57
CPL 1.226 0.132 9999.3 0.0 1.15e-03 7.20e-04 49.170 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 1.099 0.349 - - 5.88e-03 1.11e-03 69.980 57
CPL 1.094 0.439 9999.2 0.0 5.89e-03 5.91e-03 69.990 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: 60.416000 sec.
T50 in the 50-300 keV band: 37.376000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 176.708 -4.756 171.952
T90 140.900 -0.104 140.796
T50 54.864 8.552 63.416
Peak 1.000 8.584 9.584
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
166.4678 -26.6668 0.0080 30.7 -157.7 1.1436 24.1 TRIG_00429954
------------------------------------------
Foreground time interval of the image:
-4.756 15.069 (delta_t = 19.825 [sec])
Background time interval of the image:
-239.432 -56.328 (delta_t = 183.104 [sec])
-55.432 -4.756 (delta_t = 50.676 [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 -4.756 sec. to 171.952 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.23437 ( -0.119492 0.118087 )
Norm@50keV : 1.14762E-03 ( -7.19148e-05 7.18644e-05 )
------------------------------------------------------------
# Chi-Squared = 49.13 using 59 PHA bins.
# Reduced chi-squared = 0.8619 for 57 degrees of freedom
# Null hypothesis probability = 7.615133e-01
Photon flux (15-150 keV) in 176.7 sec: 0.135396 ( -0.00897867 0.00902533 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03793e-06 ( -1.38978e-07 1.39477e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.756 sec. to 171.952 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.22645 ( -0.14091 0.122343 )
Epeak [keV] : 9999.33 ( -9950.74 -9950.74 )
Norm@50keV : 1.15262E-03 ( -0.00115266 0.000286917 )
------------------------------------------------------------
# Chi-Squared = 49.17 using 59 PHA bins.
# Reduced chi-squared = 0.8781 for 56 degrees of freedom
# Null hypothesis probability = 7.289964e-01
Photon flux (15-150 keV) in 176.7 sec: 0.135338 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.03825e-06 ( -1.39028e-07 1.39558e-07 ) ergs/cm2
Band function
Time interval is from -4.756 sec. to 171.952 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.969263 ( 0.969548 0.969548 )
beta : -1.23402 ( -0.12516 0.119339 )
Epeak [keV] : 56.5456 ( -56.2102 -56.2102 )
Norm@50keV : 2.07473E-03 ( -0.000950888 1.01661 )
------------------------------------------------------------
# Chi-Squared = 49.13 using 59 PHA bins.
# Reduced chi-squared = 0.8932 for 55 degrees of freedom
# Null hypothesis probability = 6.974219e-01
Photon flux (15-150 keV) in 176.7 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 8.584 sec. to 9.584 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09928 ( -0.358922 0.339102 )
Norm@50keV : 5.87507E-03 ( -0.00110744 0.00110267 )
------------------------------------------------------------
# Chi-Squared = 69.98 using 59 PHA bins.
# Reduced chi-squared = 1.228 for 57 degrees of freedom
# Null hypothesis probability = 1.160358e-01
Photon flux (15-150 keV) in 1 sec: 0.681419 ( -0.132015 0.132374 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14388e-08 ( -1.26661e-08 1.27986e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 8.584 sec. to 9.584 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.09358 ( -0.535354 0.342173 )
Epeak [keV] : 9999.17 ( -9684.57 -9684.57 )
Norm@50keV : 5.88642E-03 ( -0.00110385 0.0107153 )
------------------------------------------------------------
# Chi-Squared = 69.99 using 59 PHA bins.
# Reduced chi-squared = 1.250 for 56 degrees of freedom
# Null hypothesis probability = 9.903967e-02
Photon flux (15-150 keV) in 1 sec: 0.681206 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 6.14484e-08 ( -1.26726e-08 1.28045e-08 ) ergs/cm2
Band function
Time interval is from 8.584 sec. to 9.584 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.912497 ( 0.912496 0.912496 )
beta : -1.09927 ( 1.09927 0.358898 )
Epeak [keV] : 43.8457 ( -43.8437 -43.8437 )
Norm@50keV : 1.00852E-02 ( -0.0100852 6873.75 )
------------------------------------------------------------
# Chi-Squared = 69.98 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 55 degrees of freedom
# Null hypothesis probability = 8.411491e-02
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 20:25:38 EDT 2010