batgrbproduct Analysis for Trigger=416485
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): Sat Mar 20 11:52:56 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger416485/GCN5_download_cron
======================================================================
Trigger: 00416485 Segment: 000
BAT Trigger Time: 290716496.408 [s; MET]
Trigger Stop: 290716496.424 [s; MET]
UTC: 2010-03-19T18:34:50.779180 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 278.442050322277 Dec: -8.53721915515869 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 10.91
Image Trigger?: NO
Rate S/N Ratio: 34.3511280746353 [ if not an image trigger ]
Image S/N Ratio: 10.91
Flight Position: [ source = BAT ]
RA: 278.442050322277 Dec: -8.53721915515869 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 278.446305151115 Dec: -8.53342811649916 [deg; J2000]
{ 18h 33m 47.1s , -08d 32' 00.3" }
+/- 1.94058776836545 [arcmin] (estimated 90% radius based on SNR)
+/- 0.721199776238366 [arcmin] (formal 1-sigma fit error)
SNR: 11.79736751864
Angular difference between Flight and Ground position is 0.339818 arcmin
Partial Coding Fraction: 0.875 [ including projection effects ]
Duration
T90: 0.0119999647140503 +/- 0.00894429003608426
Measured from: 1.19209289550781e-07
to: 0.0120000839233398 [s; relative to TRIGTIME]
T50: 0.00399994850158691 +/- 0.00565686571343518
Measured from: 0.00400012731552124
to: 0.00800007581710815 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.490000009536743
to: 0.509999990463257 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0160000324249268 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.010403 0.014471 0.007164 0.000748
0.001506 0.001726 0.001371 0.000660 [error]
Peak 0.011108 0.014590 0.006593 0.000572
0.001609 0.001772 0.001415 0.000736 [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 3.62e-09 3.48e-09 2.33e-09 2.44e-09 1.04e-08 1.19e-08 erg/cm2
Error 6.44e-10 5.89e-10 6.14e-10 1.09e-09 1.82e-09 2.37e-09 erg/cm2
Peak flux Power-law 8.96e-02 8.11e-02 5.07e-02 4.84e-02 2.42e-01 2.69e-01 ph/cm2/s
Error 7.33e-02 4.81e-02 3.81e-02 7.70e-02 1.42e-01 1.60e-01 ph/cm2/s
Fluence Cutoff-PL 2.88e-09 6.41e-09 3.41e-09 2.20e-10 1.29e-08 1.29e-08 erg/cm2
Error 7.52e-10 1.09e-09 1.10e-09 2.78e-10 1.99e-09 2.00e-09 erg/cm2
Peak flux Cutoff-PL 6.07e-02 1.05e-01 5.61e-02 5.75e-03 2.27e-01 2.28e-01 ph/cm2/s
Error 7.57e-02 6.75e-02 4.96e-02 5.49e-02 1.35e-01 1.38e-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 6.73e-02 9.64e-02 5.92e-02 5.68e-03 2.44e-01 0.00e+00 ph/cm2/s
Error 7.89e-02 6.80e-02 3.65e-02 1.47e-01 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 2.576 0.228 - - 6.38e-02 1.35e-02 74.230 57
CPL -1.023 1.345 38.2 5.0 7.11e+00 2.62e+01 43.520 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.659 1.008 - - 1.86e-03 1.49e-03 42.240 57
CPL -0.776 1.088 52.3 0.0 3.69e-02 4.50e+00 40.790 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 0.016 0.000 0.016
T90 0.012 0.000 0.012
T50 0.004 0.004 0.008
Peak 1.000 -0.490 0.510
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
278.4463 -8.5334 0.0164 17.0 -118.7 0.0320 11.8 TRIG_00416485
------------------------------------------
Foreground time interval of the image:
0.000 0.016 (delta_t = 0.016 [sec])
Background time interval of the image:
-239.408 -149.058 (delta_t = 90.350 [sec])
-148.408 0.000 (delta_t = 148.408 [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 0.000 sec. to 0.016 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.57591 ( -0.211611 0.244519 )
Norm@50keV : 6.37841E-02 ( -0.0136462 0.0132885 )
------------------------------------------------------------
# Chi-Squared = 74.23 using 59 PHA bins.
# Reduced chi-squared = 1.302 for 57 degrees of freedom
# Null hypothesis probability = 6.223419e-02
Photon flux (15-150 keV) in 0.016 sec: 13.1366 ( -2.10303 2.10311 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.04239e-08 ( -1.81578e-09 1.82498e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.016 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -1.02269 ( -1.50243 1.18818 )
Epeak [keV] : 38.2229 ( -5.28171 4.78744 )
Norm@50keV : 7.10775 ( -7.18418 45.3011 )
------------------------------------------------------------
# Chi-Squared = 43.52 using 59 PHA bins.
# Reduced chi-squared = 0.7771 for 56 degrees of freedom
# Null hypothesis probability = 8.880280e-01
Photon flux (15-150 keV) in 0.016 sec: 14.9967 ( -2.1771 2.1808 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.291e-08 ( -1.98462e-09 2.00075e-09 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.016 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.971315 ( -0.458484 2.01312 )
beta : -9.99990 ( 31843.5 31853.5 )
Epeak [keV] : 37.6247 ( -4.73561 5.412 )
Norm@50keV : 6.91839 ( -6.91839 45.9168 )
------------------------------------------------------------
# Chi-Squared = 43.56 using 59 PHA bins.
# Reduced chi-squared = 0.7920 for 55 degrees of freedom
# Null hypothesis probability = 8.669778e-01
Photon flux (15-150 keV) in 0.016 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] : 10.0481 (-1.18519 1.18748)
R^2/D10^2 : 8.06030 (-2.91689 4.90954)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 43.77 using 59 PHA bins.
# Reduced chi-squared = 0.7680 for 57 degrees of freedom
# Null hypothesis probability = 9.008227e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.656e-09 5.712e-10
25- 50 6.649e-09 1.087e-09
50-150 3.519e-09 1.160e-09
15-150 1.282e-08 2.474e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 37.3988 (-7.54328 8.91659)
Norm : 102.932 (-20.5443 24.1369)
------------------------------------------------------------
# Chi-Squared = 55.75 using 59 PHA bins.
# Reduced chi-squared = 0.9781 for 57 degrees of freedom
# Null hypothesis probability = 5.219549e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.693e-09 5.832e-10
25- 50 4.715e-09 7.496e-10
50-150 3.383e-09 1.169e-09
15-150 1.179e-08 2.026e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 3.08376 (-3.08376 162.839)
R1^2/D10^2 : 201.580 (-201.581 -201.581)
kT2 [keV] : 10.6323 (-1.42223 -10.6323)
R2^2/D10^2 : 6.04570 (-6.04573 5.15222)
------------------------------------------------------------
# Chi-Squared = 42.39 using 59 PHA bins.
# Reduced chi-squared = 0.7708 for 55 degrees of freedom
# Null hypothesis probability = 8.932051e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.981e-09 1.417e-09
25- 50 6.247e-09 2.948e-09
50-150 3.812e-09 2.103e-09
15-150 1.304e-08 6.204e-09
Peak spectrum fit
Power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.65871 ( -0.941155 1.07435 )
Norm@50keV : 1.86287E-03 ( -0.00184244 0.0011326 )
------------------------------------------------------------
# Chi-Squared = 42.24 using 59 PHA bins.
# Reduced chi-squared = 0.7411 for 57 degrees of freedom
# Null hypothesis probability = 9.278007e-01
Photon flux (15-150 keV) in 1 sec: 0.241688 ( -0.141739 0.142384 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.70071e-08 ( -1.05817e-08 1.1561e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.775779 ( 0.870451 3.04725 )
Epeak [keV] : 52.3234 ( -51.8041 -51.8041 )
Norm@50keV : 3.68667E-02 ( -0.047248 8.95881 )
------------------------------------------------------------
# Chi-Squared = 40.79 using 59 PHA bins.
# Reduced chi-squared = 0.7283 for 56 degrees of freedom
# Null hypothesis probability = 9.368440e-01
Photon flux (15-150 keV) in 1 sec: 0.227326 ( -0.129315 0.141198 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.48461e-08 ( -8.87544e-09 1.14984e-08 ) ergs/cm2
Band function
Time interval is from -0.490 sec. to 0.510 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 0.938728 ( -1.71845 0.281547 )
beta : -10.00000 ( 6.41112e+08 6.41112e+08 )
Epeak [keV] : 51.6016 ( -45.5621 -51.2567 )
Norm@50keV : 4.59939E-02 ( -0.0525078 4.89372 )
------------------------------------------------------------
# Chi-Squared = 40.78 using 59 PHA bins.
# Reduced chi-squared = 0.7414 for 55 degrees of freedom
# Null hypothesis probability = 9.235894e-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] : 12.9819 (-5.76917 11.1945)
R^2/D10^2 : 4.99169E-02 (-0.0499143 0.363921)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 40.82 using 59 PHA bins.
# Reduced chi-squared = 0.7161 for 57 degrees of freedom
# Null hypothesis probability = 9.478779e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.784e-09 1.274e-09
25- 50 6.136e-09 4.228e-09
50-150 6.532e-09 4.859e-09
15-150 1.445e-08 1.067e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 99.9715 (-100 -100)
Norm : 1.11135 (-0.661986 0.913116)
------------------------------------------------------------
# Chi-Squared = 41.70 using 59 PHA bins.
# Reduced chi-squared = 0.7316 for 57 degrees of freedom
# Null hypothesis probability = 9.359664e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.905e-09 2.060e-09
25- 50 5.022e-09 3.494e-09
50-150 8.138e-09 6.935e-09
15-150 1.606e-08 1.257e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 7.66423 (-7.69976 -7.69976)
R1^2/D10^2 : 3.18252E-02 (-0.0724352 -0.0724352)
kT2 [keV] : 13.5357 (-15.6566 -15.6566)
R2^2/D10^2 : 3.93710E-02 (-0.0177682 -0.0177682)
------------------------------------------------------------
# Chi-Squared = 40.79 using 59 PHA bins.
# Reduced chi-squared = 0.7416 for 55 degrees of freedom
# Null hypothesis probability = 9.233468e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.854e-09 3.758e-07
25- 50 6.021e-09 3.078e-06
50-150 6.628e-09 8.830e-05
15-150 1.450e-08 7.930e-05
Plot creation:
Sat Mar 20 12:15:36 EDT 2010