batgrbproduct Analysis for Trigger=419797
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 page will be updated for up to 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.45
Process Start Time (local time): Mon Apr 19 16:32:53 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger419797/GCN5_download_cron
======================================================================
Trigger: 00419797 Segment: 000
BAT Trigger Time: 293317813.76 [s; MET]
Trigger Stop: 293317814.784 [s; MET]
UTC: 2010-04-18T21:10:08.040780 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 256.376042032129 Dec: 11.4640150980648 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.06
Image Trigger?: NO
Rate S/N Ratio: 8.66025403784439 [ if not an image trigger ]
Image S/N Ratio: 7.06
Flight Position: [ source = BAT ]
RA: 256.376042032129 Dec: 11.4640150980648 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 256.357622480416 Dec: 11.4574336497856 [deg; J2000]
{ 17h 05m 25.8s , +11d 27' 26.8" }
+/- 1.94785580646821 [arcmin] (estimated 90% radius based on SNR)
+/- 0.809642185346231 [arcmin] (formal 1-sigma fit error)
SNR: 11.7345327779197
Angular difference between Flight and Ground position is 1.152875 arcmin
Partial Coding Fraction: 0.4921875 [ including projection effects ]
Duration
T90: 7.03999990224838 +/- 0.963279857831632
Measured from: -0.363999843597412
to: 6.67600005865097 [s; relative to TRIGTIME]
T50: 4.11199992895126 +/- 1.2784569003524
Measured from: 1.06800013780594
to: 5.1800000667572 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.472000002861023
to: 1.47200000286102 [s; relative to TRIGTIME]
Total Fluence
Measured from: -1.11199998855591
to: 7.81999999284744 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.299524 0.225377 0.137509 0.009085
0.028315 0.025812 0.022046 0.019263 [error]
Peak 0.054904 0.037695 0.023504 0.003116
0.009876 0.008783 0.007682 0.006359 [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 8.75e-08 1.08e-07 9.63e-08 1.49e-07 3.43e-07 4.40e-07 erg/cm2
Error 1.51e-08 1.28e-08 2.21e-08 6.86e-08 4.88e-08 9.25e-08 erg/cm2
Peak flux Power-law 6.00e-01 3.13e-01 1.02e-01 4.24e-02 1.04e+00 1.06e+00 ph/cm2/s
Error 1.65e-01 8.55e-02 5.91e-02 4.66e-02 2.27e-01 2.35e-01 ph/cm2/s
Fluence Cutoff-PL 8.75e-08 1.08e-07 9.63e-08 1.48e-07 3.43e-07 4.39e-07 erg/cm2
Error 1.51e-08 1.29e-08 2.21e-08 6.81e-08 4.88e-08 9.20e-08 erg/cm2
Peak flux Cutoff-PL 6.00e-01 3.13e-01 1.01e-01 4.20e-02 1.04e+00 1.06e+00 ph/cm2/s
Error 1.65e-01 8.55e-02 5.91e-02 4.62e-02 2.27e-01 2.35e-01 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 2.162 0.254 - - 4.11e-03 6.68e-04 64.470 57
CPL 1.920 0.000 18.5 0.0 5.34e-03 0.00e+00 65.530 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.625 0.596 - - 4.88e-03 2.16e-03 57.030 57
CPL 1.982 0.000 1.1 0.0 1.17e-02 0.00e+00 58.080 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 8.932 -1.112 7.820
T90 7.040 -0.364 6.676
T50 4.112 1.068 5.180
Peak 1.000 0.472 1.472
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
256.3576 +11.4574 0.0163 29.7 133.9 0.7150 11.7 TRIG_00419797
------------------------------------------
Foreground time interval of the image:
-1.112 7.820 (delta_t = 8.932 [sec])
Background time interval of the image:
-17.559 -1.112 (delta_t = 16.447 [sec])
Lightcurves
Notes:
- 1) All plots contain as much data as has been downloaded to date.
- 2) Multiple plots of different time binning/intervals are shown to cover all scenarios of short/long GRBs, rate/image triggers, and real/false positives.
- 3) 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.
- 4) 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.
- 5) 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 -1.112 sec. to 7.820 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16207 ( -0.245453 0.262993 )
Norm@50keV : 4.10639E-03 ( -0.000679999 0.000655262 )
------------------------------------------------------------
# Chi-Squared = 64.47 using 59 PHA bins.
# Reduced chi-squared = 1.131 for 57 degrees of freedom
# Null hypothesis probability = 2.317563e-01
Photon flux (15-150 keV) in 8.932 sec: 0.666557 ( -0.0784648 0.0785739 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43125e-07 ( -4.82059e-08 4.94894e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -1.112 sec. to 7.820 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.92041 ( )
Epeak [keV] : 18.4798 ( )
Norm@50keV : 5.33863E-03 ( )
------------------------------------------------------------
# Chi-Squared = 65.53 using 59 PHA bins.
# Reduced chi-squared = 1.170 for 56 degrees of freedom
# Null hypothesis probability = 1.798676e-01
Photon flux (15-150 keV) in 8.932 sec: 0.666269 ( -0.078434 0.078544 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.43068e-07 ( -4.82024e-08 4.94895e-08 ) ergs/cm2
Band function
Time interval is from -1.112 sec. to 7.820 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -3.26522 ( 3.05959 3.05959 )
beta : -2.16207 ( -0.262986 0.245388 )
Epeak [keV] : 14.0496 ( -14.0496 -14.0496 )
Norm@50keV : 0.558115 ( -0.0924041 0.0890174 )
------------------------------------------------------------
# Chi-Squared = 64.47 using 59 PHA bins.
# Reduced chi-squared = 1.172 for 55 degrees of freedom
# Null hypothesis probability = 1.791673e-01
Photon flux (15-150 keV) in 8.932 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] : 8.07605 (-1.28619 1.61423)
R^2/D10^2 : 0.658876 (-0.340318 0.685832)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 92.45 using 59 PHA bins.
# Reduced chi-squared = 1.622 for 57 degrees of freedom
# Null hypothesis probability = 2.067514e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.989e-08 1.483e-08
25- 50 1.243e-07 2.398e-08
50-150 3.368e-08 1.256e-08
15-150 2.279e-07 3.926e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 54.3714 (-17.7229 32.1571)
Norm : 3.55641 (-0.769411 1.03712)
------------------------------------------------------------
# Chi-Squared = 69.63 using 59 PHA bins.
# Reduced chi-squared = 1.222 for 57 degrees of freedom
# Null hypothesis probability = 1.216545e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.842e-08 8.392e-08
25- 50 1.157e-07 1.244e-07
50-150 1.209e-07 1.560e-07
15-150 3.150e-07 3.446e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.13384 (-1.08343 1.23749)
R1^2/D10^2 : 3.55334 (-2.10918 6.49996)
kT2 [keV] : 24.8098 (-7.8222 16.2611)
R2^2/D10^2 : 6.90755E-03 (-0.00550728 0.0202748)
------------------------------------------------------------
# Chi-Squared = 62.85 using 59 PHA bins.
# Reduced chi-squared = 1.143 for 55 degrees of freedom
# Null hypothesis probability = 2.182090e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 9.231e-08 3.512e-08
25- 50 9.714e-08 3.197e-08
50-150 1.738e-07 9.718e-08
15-150 3.632e-07 1.475e-07
Peak spectrum fit
Power-law model
Time interval is from 0.472 sec. to 1.472 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.62507 ( -0.519973 0.671501 )
Norm@50keV : 4.88492E-03 ( -0.0021702 0.00214248 )
------------------------------------------------------------
# Chi-Squared = 57.03 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 57 degrees of freedom
# Null hypothesis probability = 4.739993e-01
Photon flux (15-150 keV) in 1 sec: 1.03813 ( -0.227106 0.227218 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.06795e-08 ( -1.46011e-08 1.58583e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.472 sec. to 1.472 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.98179 ( )
Epeak [keV] : 1.14938 ( )
Norm@50keV : 1.16673E-02 ( )
------------------------------------------------------------
# Chi-Squared = 58.08 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 56 degrees of freedom
# Null hypothesis probability = 3.985717e-01
Photon flux (15-150 keV) in 1 sec: 1.03768 ( -0.227028 0.22713 ) ph/cm2/s
Energy fluence (15-150 keV) : 5.06696e-08 ( -1.45991e-08 1.58558e-08 ) ergs/cm2
Band function
Time interval is from 0.472 sec. to 1.472 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -8.44181 ( 5.74243 5.74243 )
beta : -2.62508 ( -0.671494 0.520571 )
Epeak [keV] : 4.81513 ( -4.81513 -4.81513 )
Norm@50keV : 0.663929 ( -0.295126 0.291204 )
------------------------------------------------------------
# Chi-Squared = 57.03 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.995270e-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] : 5.91402 (-1.74729 2.30646)
R^2/D10^2 : 3.77925 (-2.81941 14.8503)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 64.86 using 59 PHA bins.
# Reduced chi-squared = 1.138 for 57 degrees of freedom
# Null hypothesis probability = 2.216848e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.720e-08 8.954e-09
25- 50 1.662e-08 8.681e-09
50-150 1.434e-09 1.127e-09
15-150 3.525e-08 1.701e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 27.6640 (-13.3981 31.5475)
Norm : 8.76756 (-3.86611 9.86471)
------------------------------------------------------------
# Chi-Squared = 59.41 using 59 PHA bins.
# Reduced chi-squared = 1.042 for 57 degrees of freedom
# Null hypothesis probability = 3.878756e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.708e-08 5.768e-09
25- 50 1.863e-08 7.907e-09
50-150 9.150e-09 6.703e-09
15-150 4.486e-08 1.757e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.57235 (-2.16878 2.13347)
R1^2/D10^2 : 32.5483 (-28.5667 19113.3)
kT2 [keV] : 16.4411 (-9.17519 28.1138)
R2^2/D10^2 : 4.14055E-02 (-0.0397624 1.19889)
------------------------------------------------------------
# Chi-Squared = 57.06 using 59 PHA bins.
# Reduced chi-squared = 1.037 for 55 degrees of freedom
# Null hypothesis probability = 3.985749e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.895e-08 1.079e-08
25- 50 1.420e-08 7.565e-09
50-150 1.892e-08 1.230e-08
15-150 5.207e-08 2.668e-08
Plot creation:
Mon Apr 19 16:44:52 EDT 2010