batgrbproduct Analysis for Trigger=434928
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): Sun Sep 26 00:29:40 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger434928/GCN5_download_cron
======================================================================
Trigger: 00434928 Segment: 000
BAT Trigger Time: 307094712 [s; MET]
Trigger Stop: 307096304 [s; MET]
UTC: 2010-09-25T08:05:05.789760 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 254.735502427407 Dec: -15.2356628749833 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 8.11
Image Trigger?: YES
Rate S/N Ratio: 0 [ if not an image trigger ]
Image S/N Ratio: 8.11
Flight Position: [ source = BAT ]
RA: 254.735502427407 Dec: -15.2356628749833 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 254.750052736623 Dec: -15.2059923811186 [deg; J2000]
{ 16h 59m 00.0s , -15d 12' 21.6" }
+/- 2.92756134077615 [arcmin] (estimated 90% radius based on SNR)
+/- 1.79233253825806 [arcmin] (formal 1-sigma fit error)
SNR: 6.55663838737461
Angular difference between Flight and Ground position is 1.969478 arcmin
Partial Coding Fraction: 0.3828125 [ including projection effects ]
Duration
T90: 1592 +/-
Measured from: 0
to: 1592 [s; relative to TRIGTIME]
T50: 1592 +/-
Measured from: 0
to: 1592 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 1592 second)
Measured from: 0
to: 1592 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 1592 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.923764 0.641329 0.419820 0.251500
0.160178 0.151174 0.132580 0.120156 [error]
Peak 0.923764 0.641329 0.419820 0.251500
0.160178 0.151174 0.132580 0.120156 [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 2.23e-07 3.40e-07 3.90e-07 8.55e-07 1.21e-06 1.81e-06 erg/cm2
Error 7.36e-08 7.09e-08 1.34e-07 6.31e-07 3.05e-07 7.52e-07 erg/cm2
Peak flux Power-law 2.38e-02 1.99e-02 1.13e-02 9.51e-03 5.92e-02 6.46e-02 ph/cm2/s
Error 7.72e-03 4.08e-03 3.73e-03 6.39e-03 1.22e-02 1.34e-02 ph/cm2/s
Fluence Cutoff-PL 2.23e-07 3.41e-07 3.90e-07 8.47e-07 1.21e-06 1.80e-06 erg/cm2
Error 7.36e-08 7.10e-08 1.34e-07 6.26e-07 3.05e-07 7.47e-07 erg/cm2
Peak flux Cutoff-PL 2.38e-02 1.99e-02 1.13e-02 9.44e-03 5.92e-02 6.45e-02 ph/cm2/s
Error 7.72e-03 4.08e-03 3.74e-03 1.34e-02 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 1.804 0.423 - - 4.25e-04 1.05e-04 58.980 57
CPL 2.557 0.000 190.1 0.0 1.83e-04 0.00e+00 58.900 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 1.816 0.413 - - 4.27e-04 1.05e-04 59.580 57
CPL 2.530 0.000 182.5 0.0 1.91e-04 0.00e+00 59.450 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 1592.000 0.000 1592.000
T90 1592.000 0.000 1592.000
T50 1592.000 0.000 1592.000
Peak 1592.000 0.000 1592.000
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
254.7501 -15.2060 0.0293 29.7 111.2 2.5494 6.6 TRIG_00434928
------------------------------------------
Foreground time interval of the image:
247.000 303.080 (delta_t = 56.080 [sec])
706.000 723.120 (delta_t = 17.120 [sec])
728.000 963.060 (delta_t = 235.060 [sec])
Background time interval of the image:
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
Multiple GTIs in the spectrum
tstart tstop
247.000000 303.080000
706.000000 723.120400
728.000000 963.060000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.80356 ( -0.407353 0.439414 )
Norm@50keV : 4.25350E-04 ( -0.000108175 0.000102156 )
------------------------------------------------------------
# Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.035 for 57 degrees of freedom
# Null hypothesis probability = 4.028582e-01
Photon flux (15-150 keV) in 308.3 sec: 5.86936E-02 ( -0.0123222 0.0123504 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20709e-06 ( -2.99522e-07 3.10797e-07 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
247.000000 303.080000
706.000000 723.120400
728.000000 963.060000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.55716 ( )
Epeak [keV] : 190.099 ( )
Norm@50keV : 1.83285E-04 ( )
------------------------------------------------------------
# Chi-Squared = 58.90 using 59 PHA bins.
# Reduced chi-squared = 1.052 for 56 degrees of freedom
# Null hypothesis probability = 3.698802e-01
Photon flux (15-150 keV) in 308.3 sec: 5.86702E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.20692e-06 ( -2.99526e-07 3.10834e-07 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
247.000000 303.080000
706.000000 723.120400
728.000000 963.060000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.46671 ( 1.46671 1.46671 )
beta : -1.80353 ( 1.80354 0.407565 )
Epeak [keV] : 11.0986 ( -11.0986 -11.0986 )
Norm@50keV : 1.15461E-03 ( -0.00115461 996.888 )
------------------------------------------------------------
# Chi-Squared = 58.98 using 59 PHA bins.
# Reduced chi-squared = 1.072 for 55 degrees of freedom
# Null hypothesis probability = 3.320570e-01
Photon flux (15-150 keV) in 308.3 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 728.000 sec. to 963.060 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.81641 ( -0.396402 0.42998 )
Norm@50keV : 4.27169E-04 ( -0.000108442 0.000102237 )
------------------------------------------------------------
# Chi-Squared = 59.58 using 59 PHA bins.
# Reduced chi-squared = 1.045 for 57 degrees of freedom
# Null hypothesis probability = 3.818999e-01
Photon flux (15-150 keV) in 308.3 sec: 5.92419E-02 ( -0.0121483 0.0121626 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21177e-06 ( -2.98507e-07 3.0994e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from 728.000 sec. to 963.060 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.52967 ( )
Epeak [keV] : 182.538 ( )
Norm@50keV : 1.90620E-04 ( )
------------------------------------------------------------
# Chi-Squared = 59.45 using 59 PHA bins.
# Reduced chi-squared = 1.062 for 56 degrees of freedom
# Null hypothesis probability = 3.512564e-01
Photon flux (15-150 keV) in 308.3 sec: 5.92186E-02 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.21159e-06 ( -2.98508e-07 3.09974e-07 ) ergs/cm2
Band function
Time interval is from 728.000 sec. to 963.060 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.48651 ( 1.48651 1.48651 )
beta : -1.81636 ( -0.430203 0.397117 )
Epeak [keV] : 9.58511 ( -9.58511 -9.58511 )
Norm@50keV : 1.18546E-03 ( -0.00118546 1458.18 )
------------------------------------------------------------
# Chi-Squared = 59.58 using 59 PHA bins.
# Reduced chi-squared = 1.083 for 55 degrees of freedom
# Null hypothesis probability = 3.126123e-01
Photon flux (15-150 keV) in 308.3 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 Sep 26 00:36:12 EDT 2010