batgrbproduct Analysis for Trigger=434843
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 10 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Sep 24 10:42:04 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger434843/GCN5_download_cron
======================================================================
Trigger: 00434843 Segment: 000
BAT Trigger Time: 306993495.104 [s; MET]
Trigger Stop: 306993496.128 [s; MET]
UTC: 2010-09-24T03:58:08.897460 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 0.671341527158533 Dec: 7.01503025438085 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 12.02
Image Trigger?: NO
Rate S/N Ratio: 40.8900966005217 [ if not an image trigger ]
Image S/N Ratio: 12.02
Flight Position: [ source = BAT ]
RA: 0.671341527158533 Dec: 7.01503025438085 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 0.672263947806098 Dec: 7.00416067202216 [deg; J2000]
{ 00h 02m 41.3s , +07d 00' 15.0" }
+/- 0.960020649353415 [arcmin] (estimated 90% radius based on SNR)
+/- 0.357877207411675 [arcmin] (formal 1-sigma fit error)
SNR: 32.2427328562168
Angular difference between Flight and Ground position is 0.654484 arcmin
Partial Coding Fraction: 0.25 [ including projection effects ]
Duration
T90: 96 +/- 16
Measured from: -15.1039998531342
to: 80.8960001468658 [s; relative to TRIGTIME]
T50: 16 +/- 16
Measured from: 32.8960001468658
to: 48.8960001468658 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 56.3960000276566
to: 57.3960000276566 [s; relative to TRIGTIME]
Total Fluence
Measured from: -15.1039999723434
to: 128.896000027657 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 3.593778 4.873995 3.679261 0.970352
0.130031 0.137703 0.125523 0.112488 [error]
Peak 0.044963 0.087196 0.030966 0.011374
0.011724 0.012248 0.011017 0.009228 [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 1.16e-06 2.08e-06 2.87e-06 8.26e-06 8.28e-06 1.44e-05 erg/cm2
Error 7.60e-08 7.88e-08 1.27e-07 8.26e-07 3.05e-07 9.02e-07 erg/cm2
Peak flux Power-law 6.40e-01 4.96e-01 2.58e-01 1.94e-01 1.48e+00 1.59e+00 ph/cm2/s
Error 1.66e-01 9.73e-02 8.15e-02 1.13e-01 2.89e-01 3.17e-01 ph/cm2/s
Fluence Cutoff-PL 1.11e-06 2.11e-06 2.91e-06 6.49e-06 8.18e-06 1.26e-05 erg/cm2
Error 9.57e-08 6.63e-08 1.38e-07 1.87e-06 2.63e-07 1.86e-06 erg/cm2
Peak flux Cutoff-PL 5.26e-01 6.44e-01 2.27e-01 1.44e-02 1.41e+00 1.41e+00 ph/cm2/s
Error 2.01e-01 1.54e-01 1.10e-01 2.92e-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 1.534 0.065 - - 6.09e-03 2.09e-04 45.370 57
CPL 1.365 0.234 199.7 0.0 7.32e-03 0.00e+00 44.030 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 1.944 0.338 - - 1.01e-02 2.49e-03 35.720 57
CPL -0.476 2.510 40.5 12.5 2.77e-01 9.74e+00 30.910 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: 69.440000 sec.
T50 in the 50-300 keV band: 18.048000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 144.000 -15.104 128.896
T90 96.000 -15.104 80.896
T50 16.000 32.896 48.896
Peak 1.000 56.396 57.396
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
0.6723 +7.0042 0.0060 33.1 99.5 13.8497 32.2 TRIG_00434843
------------------------------------------
Foreground time interval of the image:
-15.104 128.896 (delta_t = 144.000 [sec])
Background time interval of the image:
-239.104 -145.044 (delta_t = 94.060 [sec])
-144.104 -15.104 (delta_t = 129.000 [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 -15.104 sec. to 128.896 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53396 ( -0.064808 0.0650015 )
Norm@50keV : 6.09240E-03 ( -0.000208933 0.000208764 )
------------------------------------------------------------
# Chi-Squared = 45.37 using 59 PHA bins.
# Reduced chi-squared = 0.7960 for 57 degrees of freedom
# Null hypothesis probability = 8.664962e-01
Photon flux (15-150 keV) in 144 sec: 0.767728 ( -0.0280951 0.028171 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.27844e-06 ( -3.04652e-07 3.05479e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -15.104 sec. to 128.896 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.36526 ( -0.261442 0.205662 )
Epeak [keV] : 199.702 ( )
Norm@50keV : 7.32297E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.03 using 59 PHA bins.
# Reduced chi-squared = 0.7863 for 56 degrees of freedom
# Null hypothesis probability = 8.767618e-01
Photon flux (15-150 keV) in 144 sec: 0.758578 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.17828e-06 ( -2.84386e-07 2.40941e-07 ) ergs/cm2
Band function
Time interval is from -15.104 sec. to 128.896 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.19043 ( 1.11136 1.11136 )
beta : -1.60484 ( 1.61449 0.124237 )
Epeak [keV] : 99.0732 ( -88.9586 -88.9586 )
Norm@50keV : 9.39780E-03 ( -0.00343364 206.197 )
------------------------------------------------------------
# Chi-Squared = 43.86 using 59 PHA bins.
# Reduced chi-squared = 0.7975 for 55 degrees of freedom
# Null hypothesis probability = 8.596338e-01
Photon flux (15-150 keV) in 144 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 56.396 sec. to 57.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.94371 ( -0.320444 0.355757 )
Norm@50keV : 1.01339E-02 ( -0.00252738 0.00245126 )
------------------------------------------------------------
# Chi-Squared = 35.72 using 59 PHA bins.
# Reduced chi-squared = 0.6266 for 57 degrees of freedom
# Null hypothesis probability = 9.877935e-01
Photon flux (15-150 keV) in 1 sec: 1.48206 ( -0.289027 0.289034 ) ph/cm2/s
Energy fluence (15-150 keV) : 9.32523e-08 ( -2.18535e-08 2.27507e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 56.396 sec. to 57.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.475532 ( -3.05533 1.96471 )
Epeak [keV] : 40.4916 ( -8.88993 16.1373 )
Norm@50keV : 0.276540 ( -0.291756 19.1791 )
------------------------------------------------------------
# Chi-Squared = 30.91 using 59 PHA bins.
# Reduced chi-squared = 0.5519 for 56 degrees of freedom
# Null hypothesis probability = 9.974170e-01
Photon flux (15-150 keV) in 1 sec: 1.41020 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 7.88487e-08 ( -1.86758e-08 2.28533e-08 ) ergs/cm2
Band function
Time interval is from 56.396 sec. to 57.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.695203 ( -2.35546 3.75446 )
beta : -3.80589 ( 3.72556 1.61604 )
Epeak [keV] : 39.7354 ( -11.5819 10.1104 )
Norm@50keV : 0.383661 ( -0.374317 120.93 )
------------------------------------------------------------
# Chi-Squared = 30.85 using 59 PHA bins.
# Reduced chi-squared = 0.5609 for 55 degrees of freedom
# Null hypothesis probability = 9.965338e-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:
Fri Sep 24 10:54:22 EDT 2010