batgrbproduct Analysis for Trigger=434360
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 17 12:15:34 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger434360/GCN5_download_cron
======================================================================
Trigger: 00434360 Segment: 000
BAT Trigger Time: 306392611.968 [s; MET]
Trigger Stop: 306392616.064 [s; MET]
UTC: 2010-09-17T05:03:25.783360 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 289.264654463964 Dec: -17.1044750247871 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.15
Image Trigger?: NO
Rate S/N Ratio: 7.87400787401181 [ if not an image trigger ]
Image S/N Ratio: 7.15
Flight Position: [ source = BAT ]
RA: 289.264654463964 Dec: -17.1044750247871 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 289.250423050522 Dec: -17.1200259405498 [deg; J2000]
{ 19h 17m 00.1s , -17d 07' 12.1" }
+/- 2.08616904352347 [arcmin] (estimated 90% radius based on SNR)
+/- 0.915215448751519 [arcmin] (formal 1-sigma fit error)
SNR: 10.6390980980969
Angular difference between Flight and Ground position is 1.239590 arcmin
Partial Coding Fraction: 0.625 [ including projection effects ]
Duration
T90: 65.4560000300407 +/- 21.8778105122229
Measured from: -0.703999876976013
to: 64.7520001530647 [s; relative to TRIGTIME]
T50: 25.5680000185966 +/- 8.70489701505213
Measured from: 4.80000013113022
to: 30.3680001497269 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 3.22000002861023
to: 4.22000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.12800002098083
to: 75.8240000009537 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.533359 0.499075 0.371050 0.087975
0.058506 0.059127 0.051613 0.045567 [error]
Peak 0.016908 0.032737 0.016116 0.016283
0.007057 0.007088 0.006358 0.005415 [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 1.39e-07 2.30e-07 2.89e-07 7.24e-07 8.60e-07 1.38e-06 erg/cm2
Error 2.70e-08 2.71e-08 5.28e-08 2.84e-07 1.21e-07 3.28e-07 erg/cm2
Peak flux Power-law 2.26e-01 2.01e-01 1.23e-01 1.14e-01 5.99e-01 6.64e-01 ph/cm2/s
Error 9.77e-02 5.58e-02 5.34e-02 1.03e-01 1.65e-01 1.91e-01 ph/cm2/s
Fluence Cutoff-PL 1.39e-07 2.30e-07 2.89e-07 7.18e-07 8.60e-07 1.38e-06 erg/cm2
Error 2.70e-08 2.71e-08 5.29e-08 2.82e-07 1.21e-07 3.26e-07 erg/cm2
Peak flux Cutoff-PL 2.26e-01 2.01e-01 1.23e-01 1.13e-01 5.99e-01 6.57e-01 ph/cm2/s
Error 9.77e-02 5.58e-02 5.34e-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 1.669 0.231 - - 1.19e-03 1.55e-04 72.490 57
CPL 1.678 0.232 9999.4 0.0 1.19e-03 0.00e+00 72.500 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 1.710 0.555 - - 4.49e-03 1.48e-03 73.640 57
CPL 1.733 0.771 9999.4 0.0 4.42e-03 0.00e+00 73.640 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: 42.816000 sec.
T50 in the 50-300 keV band: 24.576000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 77.952 -2.128 75.824
T90 65.456 -0.704 64.752
T50 25.568 4.800 30.368
Peak 1.000 3.220 4.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
289.2504 -17.1200 0.0181 24.6 -106.1 1.3539 10.6 TRIG_00434360
------------------------------------------
Foreground time interval of the image:
-2.128 75.824 (delta_t = 77.952 [sec])
Background time interval of the image:
-235.867 -2.128 (delta_t = 233.739 [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 -2.128 sec. to 75.824 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.66931 ( -0.227341 0.234036 )
Norm@50keV : 1.18881E-03 ( -0.000157499 0.000153305 )
------------------------------------------------------------
# Chi-Squared = 72.49 using 59 PHA bins.
# Reduced chi-squared = 1.272 for 57 degrees of freedom
# Null hypothesis probability = 8.109477e-02
Photon flux (15-150 keV) in 77.95 sec: 0.156232 ( -0.0184084 0.0184309 ) ph/cm2/s
Energy fluence (15-150 keV) : 8.60248e-07 ( -1.20263e-07 1.2242e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.128 sec. to 75.824 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.67770 ( -0.237523 0.22653 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 1.18757E-03 ( )
------------------------------------------------------------
# Chi-Squared = 72.50 using 59 PHA bins.
# Reduced chi-squared = 1.295 for 56 degrees of freedom
# Null hypothesis probability = 6.817151e-02
Photon flux (15-150 keV) in 77.95 sec: 0.156168 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 8.60139e-07 ( -1.20285e-07 1.22444e-07 ) ergs/cm2
Band function
Time interval is from -2.128 sec. to 75.824 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.32692 ( 1.32696 1.32696 )
beta : -1.66919 ( 1.66924 0.227324 )
Epeak [keV] : 22.4566 ( -22.4465 -22.4465 )
Norm@50keV : 2.77518E-03 ( -0.00277542 109.691 )
------------------------------------------------------------
# Chi-Squared = 72.49 using 59 PHA bins.
# Reduced chi-squared = 1.318 for 55 degrees of freedom
# Null hypothesis probability = 5.711012e-02
Photon flux (15-150 keV) in 77.95 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 3.220 sec. to 4.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70969 ( -0.532587 0.578272 )
Norm@50keV : 4.49375E-03 ( -0.00153646 0.00142332 )
------------------------------------------------------------
# Chi-Squared = 73.64 using 59 PHA bins.
# Reduced chi-squared = 1.292 for 57 degrees of freedom
# Null hypothesis probability = 6.821131e-02
Photon flux (15-150 keV) in 1 sec: 0.598868 ( -0.165394 0.165424 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.15762e-08 ( -1.40294e-08 1.47783e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 3.220 sec. to 4.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.73270 ( -0.982568 0.559506 )
Epeak [keV] : 9999.36 ( )
Norm@50keV : 4.41520E-03 ( )
------------------------------------------------------------
# Chi-Squared = 73.64 using 59 PHA bins.
# Reduced chi-squared = 1.315 for 56 degrees of freedom
# Null hypothesis probability = 5.703489e-02
Photon flux (15-150 keV) in 1 sec: 0.598639 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 4.15622e-08 ( -1.40279e-08 1.47799e-08 ) ergs/cm2
Band function
Time interval is from 3.220 sec. to 4.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.35958 ( 1.3599 1.3599 )
beta : -1.70919 ( 1.70937 0.532085 )
Epeak [keV] : 19.6208 ( -19.424 -19.424 )
Norm@50keV : 1.09257E-02 ( -0.0109528 5574.48 )
------------------------------------------------------------
# Chi-Squared = 73.64 using 59 PHA bins.
# Reduced chi-squared = 1.339 for 55 degrees of freedom
# Null hypothesis probability = 4.740954e-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:
Fri Sep 17 12:42:29 EDT 2010