batgrbproduct Analysis for Trigger=433442
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): Mon Sep 6 11:41:22 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger433442/GCN5_download_cron
======================================================================
Trigger: 00433442 Segment: 000
BAT Trigger Time: 305392100.864 [s; MET]
Trigger Stop: 305392101.888 [s; MET]
UTC: 2010-09-05T15:08:14.715440 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 31.5300993876886 Dec: 14.9318648275642 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 8.53
Image Trigger?: NO
Rate S/N Ratio: 14.0356688476182 [ if not an image trigger ]
Image S/N Ratio: 8.53
Flight Position: [ source = BAT ]
RA: 31.5300993876886 Dec: 14.9318648275642 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 31.540841609483 Dec: 14.9201132226877 [deg; J2000]
{ 02h 06m 09.8s , +14d 55' 12.4" }
+/- 1.71121565463065 [arcmin] (estimated 90% radius based on SNR)
+/- 0.866509591191102 [arcmin] (formal 1-sigma fit error)
SNR: 14.1197135990226
Angular difference between Flight and Ground position is 0.940757 arcmin
Partial Coding Fraction: 1.015625 [ including projection effects ]
Duration
T90: 3.40399998426437 +/- 0.50925829092701
Measured from: -1.5239999294281
to: 1.88000005483627 [s; relative to TRIGTIME]
T50: 1.59199994802475 +/- 0.477346851085323
Measured from: -0.6039999127388
to: 0.98800003528595 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.0320000052452087
to: 1.03200000524521 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.64000004529953
to: 2.13999998569489 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.044134 0.103332 0.082802 0.025205
0.009411 0.010074 0.009019 0.007358 [error]
Peak 0.009510 0.034280 0.030508 0.009951
0.004890 0.005234 0.004807 0.003759 [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 1.43e-08 3.40e-08 6.39e-08 2.91e-07 1.73e-07 4.04e-07 erg/cm2
Error 3.08e-09 4.44e-09 8.19e-09 8.31e-08 2.13e-08 8.80e-08 erg/cm2
Peak flux Power-law 1.20e-01 1.75e-01 1.90e-01 3.87e-01 6.04e-01 8.72e-01 ph/cm2/s
Error 4.36e-02 4.04e-02 3.50e-02 1.46e-01 1.11e-01 1.71e-01 ph/cm2/s
Fluence Cutoff-PL 1.24e-08 3.61e-08 6.81e-08 1.20e-07 1.66e-07 2.37e-07 erg/cm2
Error 3.66e-09 5.27e-09 9.64e-09 1.32e-07 2.31e-08 1.32e-07 erg/cm2
Peak flux Cutoff-PL 7.54e-02 1.89e-01 2.28e-01 6.05e-01 0.00e+00 0.00e+00 ph/cm2/s
Error 4.84e-02 4.99e-02 4.67e-02 1.59e-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 6.21e-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 1.087 0.189 - - 4.37e-03 4.90e-04 54.590 57
CPL 0.396 0.847 125.5 -41.0 9.26e-03 9.71e-03 52.120 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 0.880 0.288 - - 5.26e-03 9.72e-04 57.480 57
CPL -0.852 1.685 94.6 76.2 3.03e-02 1.06e-01 52.370 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: 2.816000 sec.
T50 in the 50-300 keV band: 1.216000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 3.780 -1.640 2.140
T90 3.404 -1.524 1.880
T50 1.592 -0.604 0.988
Peak 1.000 0.032 1.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
31.5408 +14.9201 0.0135 8.8 12.5 0.2633 14.1 TRIG_00433442
------------------------------------------
Foreground time interval of the image:
-1.640 2.140 (delta_t = 3.780 [sec])
Background time interval of the image:
-134.963 -1.640 (delta_t = 133.323 [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 -1.640 sec. to 2.140 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.08724 ( -0.191488 0.186272 )
Norm@50keV : 4.36715E-03 ( -0.000490172 0.000489636 )
------------------------------------------------------------
# Chi-Squared = 54.59 using 59 PHA bins.
# Reduced chi-squared = 0.9578 for 57 degrees of freedom
# Null hypothesis probability = 5.659528e-01
Photon flux (15-150 keV) in 3.78 sec: 0.505954 ( -0.0580422 0.0581642 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.73307e-07 ( -2.12349e-08 2.13926e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.640 sec. to 2.140 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.396251 ( -0.900852 0.792757 )
Epeak [keV] : 125.464 ( -43.3948 -125.465 )
Norm@50keV : 9.26452E-03 ( -0.00502493 0.0143939 )
------------------------------------------------------------
# Chi-Squared = 52.12 using 59 PHA bins.
# Reduced chi-squared = 0.9308 for 56 degrees of freedom
# Null hypothesis probability = 6.223941e-01
Photon flux (15-150 keV) in 3.78 sec: 0.493205 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.66118e-07 ( -2.31941e-08 2.30361e-08 ) ergs/cm2
Band function
Time interval is from -1.640 sec. to 2.140 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.24013 ( -16.2883 -6.43465 )
beta : -1.33312 ( -0.186742 0.255655 )
Epeak [keV] : 36.7157 ( -9.65643 8.52046 )
Norm@50keV : 13.2267 ( -13.2317 6.5063 )
------------------------------------------------------------
# Chi-Squared = 50.38 using 59 PHA bins.
# Reduced chi-squared = 0.9160 for 55 degrees of freedom
# Null hypothesis probability = 6.515643e-01
Photon flux (15-150 keV) in 3.78 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 0.032 sec. to 1.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.879540 ( -0.297728 0.278856 )
Norm@50keV : 5.26057E-03 ( -0.000976626 0.000967006 )
------------------------------------------------------------
# Chi-Squared = 57.48 using 59 PHA bins.
# Reduced chi-squared = 1.008 for 57 degrees of freedom
# Null hypothesis probability = 4.573727e-01
Photon flux (15-150 keV) in 1 sec: 0.603708 ( -0.11099 0.111653 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.9514e-08 ( -1.11098e-08 1.11937e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.032 sec. to 1.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.851816 ( -2.00875 1.36209 )
Epeak [keV] : 94.5996 ( -24.9876 127.335 )
Norm@50keV : 3.03443E-02 ( -0.0303449 0.180911 )
------------------------------------------------------------
# Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9352 for 56 degrees of freedom
# Null hypothesis probability = 6.129761e-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 0.032 sec. to 1.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.851651 ( -1.23526 1.00466 )
beta : -10.00000 ( 1.09846e+08 1.09846e+08 )
Epeak [keV] : 94.6012 ( -24.9814 127.321 )
Norm@50keV : 3.03392E-02 ( -0.0303379 0.180924 )
------------------------------------------------------------
# Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9522 for 55 degrees of freedom
# Null hypothesis probability = 5.756530e-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:
Mon Sep 6 11:59:22 EDT 2010