batgrbproduct Analysis for Trigger=430172
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): Wed Jul 28 17:35:39 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger430172/GCN5_download_cron
======================================================================
Trigger: 00430172 Segment: 000
BAT Trigger Time: 302005921.856 [s; MET]
Trigger Stop: 302005922.88 [s; MET]
UTC: 2010-07-28T10:31:55.829200 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 44.0530055621985 Dec: 0.27954807728338 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 9.07
Image Trigger?: NO
Rate S/N Ratio: 22.4499443206436 [ if not an image trigger ]
Image S/N Ratio: 9.07
Flight Position: [ source = BAT ]
RA: 44.0530055621985 Dec: 0.27954807728338 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 44.050814243629 Dec: 0.29608770173254 [deg; J2000]
{ 02h 56m 12.2s , +00d 17' 45.9" }
+/- 1.48502532565046 [arcmin] (estimated 90% radius based on SNR)
+/- 0.375234288014755 [arcmin] (formal 1-sigma fit error)
SNR: 17.2895740494486
Angular difference between Flight and Ground position is 1.001049 arcmin
Partial Coding Fraction: 0.1132812 [ including projection effects ]
Duration
T90: 12.0800000429153 +/- 2.41053683809571
Measured from: -1.27999991178513
to: 10.8000001311302 [s; relative to TRIGTIME]
T50: 3.56800001859665 +/- 1.33110479867153
Measured from: 0.208000123500824
to: 3.77600014209747 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.180000007152557
to: 1.18000000715256 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.74400001764297
to: 13.1999999880791 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.555935 0.928332 0.753013 0.231605
0.063194 0.068292 0.060194 0.049578 [error]
Peak 0.101200 0.147093 0.134596 0.028238
0.018158 0.021011 0.019340 0.015008 [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 2.36e-07 4.22e-07 5.79e-07 1.64e-06 1.67e-06 2.88e-06 erg/cm2
Error 3.42e-08 3.71e-08 5.92e-08 3.63e-07 1.45e-07 4.05e-07 erg/cm2
Peak flux Power-law 1.16e+00 1.16e+00 8.16e-01 9.10e-01 3.49e+00 4.04e+00 ph/cm2/s
Error 2.81e-01 1.85e-01 1.48e-01 3.18e-01 5.35e-01 6.09e-01 ph/cm2/s
Fluence Cutoff-PL 2.27e-07 4.31e-07 5.90e-07 1.24e-06 1.65e-06 2.49e-06 erg/cm2
Error 4.12e-08 4.31e-08 5.84e-08 6.88e-07 1.52e-07 7.04e-07 erg/cm2
Peak flux Cutoff-PL 8.74e-01 1.31e+00 9.53e-01 3.18e-01 3.37e+00 3.45e+00 ph/cm2/s
Error 3.45e-01 2.33e-01 1.93e-01 6.07e-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 1.05e+00 1.30e+00 3.62e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 3.18e-01 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 1.546 0.141 - - 1.19e-02 9.68e-04 53.260 57
CPL 1.341 0.461 171.1 0.0 1.49e-02 1.42e-02 52.850 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 1.508 0.231 - - 2.79e-02 4.24e-03 65.360 57
CPL 0.100 1.249 71.2 38.2 1.35e-01 3.03e-01 60.210 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: 12.992000 sec.
T50 in the 50-300 keV band: 5.504000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 14.944 -1.744 13.200
T90 12.080 -1.280 10.800
T50 3.568 0.208 3.776
Peak 1.000 0.180 1.180
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
44.0508 +0.2961 0.0111 46.9 146.3 2.5594 17.3 TRIG_00430172
------------------------------------------
Foreground time interval of the image:
-1.744 13.200 (delta_t = 14.944 [sec])
Background time interval of the image:
-239.856 -57.336 (delta_t = 182.520 [sec])
-55.856 -1.744 (delta_t = 54.112 [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 -1.744 sec. to 13.200 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.54560 ( -0.140504 0.141449 )
Norm@50keV : 1.18709E-02 ( -0.000969931 0.000966836 )
------------------------------------------------------------
# Chi-Squared = 53.26 using 59 PHA bins.
# Reduced chi-squared = 0.9343 for 57 degrees of freedom
# Null hypothesis probability = 6.163220e-01
Photon flux (15-150 keV) in 14.94 sec: 1.50088 ( -0.128357 0.128739 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.67067e-06 ( -1.44671e-07 1.45179e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.744 sec. to 13.200 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.34127 ( -0.594418 0.32707 )
Epeak [keV] : 171.107 ( -171.107 -171.107 )
Norm@50keV : 1.49073E-02 ( -0.0149073 0.0134704 )
------------------------------------------------------------
# Chi-Squared = 52.85 using 59 PHA bins.
# Reduced chi-squared = 0.9437 for 56 degrees of freedom
# Null hypothesis probability = 5.950491e-01
Photon flux (15-150 keV) in 14.94 sec: 1.48667 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.6546e-06 ( -1.52762e-07 1.51925e-07 ) ergs/cm2
Band function
Time interval is from -1.744 sec. to 13.200 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.21475 ( 1.22788 3.90491 )
beta : -1.67547 ( 1.67242 0.256378 )
Epeak [keV] : 110.765 ( -118.988 738.651 )
Norm@50keV : 1.76622E-02 ( -0.00544361 0.19803 )
------------------------------------------------------------
# Chi-Squared = 52.86 using 59 PHA bins.
# Reduced chi-squared = 0.9611 for 55 degrees of freedom
# Null hypothesis probability = 5.569110e-01
Photon flux (15-150 keV) in 14.94 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 0.180 sec. to 1.180 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.50833 ( -0.229034 0.233866 )
Norm@50keV : 2.79209E-02 ( -0.00425161 0.00423379 )
------------------------------------------------------------
# Chi-Squared = 65.36 using 59 PHA bins.
# Reduced chi-squared = 1.147 for 57 degrees of freedom
# Null hypothesis probability = 2.092241e-01
Photon flux (15-150 keV) in 1 sec: 3.49347 ( -0.534812 0.535906 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.64518e-07 ( -4.28475e-08 4.31357e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.180 sec. to 1.180 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.100141 ( -1.41486 1.08391 )
Epeak [keV] : 71.1973 ( -14.6859 61.7139 )
Norm@50keV : 0.135182 ( -0.135182 0.470522 )
------------------------------------------------------------
# Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.075 for 56 degrees of freedom
# Null hypothesis probability = 3.261699e-01
Photon flux (15-150 keV) in 1 sec: 3.37363 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 2.54492e-07 ( -4.3406e-08 4.4124e-08 ) ergs/cm2
Band function
Time interval is from 0.180 sec. to 1.180 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.88673E-02 ( -0.746482 1.99486 )
beta : -10.00000 ( 4.23857e+11 4.23857e+11 )
Epeak [keV] : 71.1538 ( -14.6552 61.7392 )
Norm@50keV : 0.135419 ( -0.135419 0.470956 )
------------------------------------------------------------
# Chi-Squared = 60.21 using 59 PHA bins.
# Reduced chi-squared = 1.095 for 55 degrees of freedom
# Null hypothesis probability = 2.930030e-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:
Wed Jul 28 18:15:01 EDT 2010