batgrbproduct Analysis for Trigger=421262
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 v2.46
Process Start Time (local time): Thu May 6 16:51:33 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger421262/GCN5_download_cron
======================================================================
Trigger: 00421262 Segment: 000
BAT Trigger Time: 294849470.672 [s; MET]
Trigger Stop: 294849470.688 [s; MET]
UTC: 2010-05-06T14:37:44.899080 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.33083121338 Dec: -4.92113449915016 [deg; J2000]
Catalogged Source?: YES
Point Source?: YES
GRB Indicated?: NO [ by BAT flight software ]
Image S/N Ratio: 6.79
Image Trigger?: NO
Rate S/N Ratio: 14.142135623731 [ if not an image trigger ]
Image S/N Ratio: 6.79
Flight Position: [ source = BAT ]
RA: 280.33083121338 Dec: -4.92113449915016 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.341230236752 Dec: -4.91212843731314 [deg; J2000]
{ 18h 41m 21.9s , -04d 54' 43.7" }
+/- 2.20649804823615 [arcmin] (estimated 90% radius based on SNR)
+/- 1.18064926584148 [arcmin] (formal 1-sigma fit error)
SNR: 9.820041246897
Angular difference between Flight and Ground position is 0.823672 arcmin
Partial Coding Fraction: 0.6953125 [ including projection effects ]
Duration
T90: 0.0239999890327454 +/- 0.00894423672410898
Measured from: -0.00799989700317383
to: 0.0160000920295715 [s; relative to TRIGTIME]
T50: 0.015999972820282 +/- 0.00800001621246338
Measured from: -0.00399988889694214
to: 0.0120000839233398 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.491999983787537
to: 0.508000016212463 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.00800001621246338
to: 0.0199999809265137 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006867 0.014564 0.008769 0.001585
0.001839 0.001992 0.001704 0.001009 [error]
Peak 0.005477 0.015228 0.009392 0.001257
0.001981 0.002078 0.001778 0.001072 [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 2.22e-09 8.31e-10 1.80e-10 4.68e-11 3.26e-09 3.27e-09 erg/cm2
Error 8.26e-10 4.16e-10 1.61e-10 6.99e-11 1.26e-09 1.27e-09 erg/cm2
Peak flux Power-law 1.82e-01 7.84e-02 2.01e-02 6.37e-03 2.84e-01 2.87e-01 ph/cm2/s
Error 1.17e-01 6.38e-02 3.11e-02 2.45e-02 1.78e-01 1.81e-01 ph/cm2/s
Fluence Cutoff-PL 2.22e-09 8.33e-10 1.81e-10 4.67e-11 3.27e-09 3.27e-09 erg/cm2
Error 8.29e-10 4.17e-10 1.61e-10 6.95e-11 1.26e-09 1.27e-09 erg/cm2
Peak flux Cutoff-PL 1.98e-01 8.69e-02 1.87e-03 2.09e-07 2.88e-01 2.87e-01 ph/cm2/s
Error 1.28e-01 8.13e-02 2.74e-02 5.79e-03 1.66e-01 1.66e-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 4.206 0.749 - - 4.54e-03 3.96e-03 111.020 57
CPL 1.000 0.000 50.0 0.0 3.46e-03 0.00e+00 130.230 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 2.958 1.795 - - 1.06e-03 1.29e-03 66.860 57
CPL -4.912 0.000 22.5 8.9 8.45e+02 7.03e+02 65.790 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 0.028 -0.008 0.020
T90 0.024 -0.008 0.016
T50 0.016 -0.004 0.012
Peak 1.000 -0.492 0.508
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.3412 -4.9121 0.0195 33.4 -27.5 0.0338 9.8 TRIG_00421262
------------------------------------------
Foreground time interval of the image:
-0.008 0.020 (delta_t = 0.028 [sec])
Background time interval of the image:
-239.672 -0.008 (delta_t = 239.664 [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 -0.008 sec. to 0.020 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.20576 ( -0.576049 0.921598 )
Norm@50keV : 4.53860E-03 ( -0.00453841 0.00337698 )
------------------------------------------------------------
# Chi-Squared = 111.02 using 59 PHA bins.
# Reduced chi-squared = 1.9478 for 57 degrees of freedom
# Null hypothesis probability = 2.438620e-05
Photon flux (15-150 keV) in 0.028 sec: 3.35608 ( -1.24693 1.24738 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26371e-09 ( -1.24742e-09 1.26534e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.008 sec. to 0.020 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 3.46090E-03 ( )
------------------------------------------------------------
# Chi-Squared = 130.23 using 59 PHA bins.
# Reduced chi-squared = 2.3254 for 56 degrees of freedom
# Null hypothesis probability = 7.570894e-08
Photon flux (15-150 keV) in 0.028 sec: 5.59550 ( -1.4671 1.46606 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.26525e-09 ( -1.25522e-09 1.26608e-09 ) ergs/cm2
Band function
Time interval is from -0.008 sec. to 0.020 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.66010 ( )
beta : -2.48856 ( )
Epeak [keV] : 40.3208 ( )
Norm@50keV : 1.42077E-03 ( )
------------------------------------------------------------
# Chi-Squared = 130.02 using 59 PHA bins.
# Reduced chi-squared = 2.3640 for 55 degrees of freedom
# Null hypothesis probability = 5.142648e-08
Photon flux (15-150 keV) in 0.028 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] : 5.67628 (-0.757404 0.586846)
R^2/D10^2 : 27.6944 (-12.7869 22.0099)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 92.84 using 59 PHA bins.
# Reduced chi-squared = 1.629 for 57 degrees of freedom
# Null hypothesis probability = 1.899629e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 3.052e-09 1.023e-09
25- 50 2.691e-09 1.163e-09
50-150 1.952e-10 1.495e-10
15-150 5.938e-09 2.476e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 12.4744 (-2.73574 3.3959)
Norm : 104.368 (-40.5662 82.1447)
------------------------------------------------------------
# Chi-Squared = 102.60 using 59 PHA bins.
# Reduced chi-squared = 1.8000 for 57 degrees of freedom
# Null hypothesis probability = 2.023134e-04
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.781e-09 1.359e-09
25- 50 1.572e-09 7.185e-10
50-150 1.876e-10 1.487e-10
15-150 4.541e-09 2.076e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.73101 (-0.726181 0.616684)
R1^2/D10^2 : 26.6066 (-11.8679 22.8604)
kT2 [keV] : 0.118238 (13.1599 -0.118238)
R2^2/D10^2 : 0.105999 (-0.106055 -0.106055)
------------------------------------------------------------
# Chi-Squared = 92.83 using 59 PHA bins.
# Reduced chi-squared = 1.688 for 55 degrees of freedom
# Null hypothesis probability = 1.079017e-03
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Peak spectrum fit
Power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.95834 ( -1.21279 2.37746 )
Norm@50keV : 1.06210E-03 ( -0.00106311 0.0015088 )
------------------------------------------------------------
# Chi-Squared = 66.86 using 59 PHA bins.
# Reduced chi-squared = 1.173 for 57 degrees of freedom
# Null hypothesis probability = 1.744674e-01
Photon flux (15-150 keV) in 1 sec: 0.284173 ( -0.176498 0.180199 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.25489e-08 ( -8.54205e-09 1.15884e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.91200 ( )
Epeak [keV] : 22.5325 ( -8.0293 9.74445 )
Norm@50keV : 844.771 ( -844.707 560.609 )
------------------------------------------------------------
# Chi-Squared = 65.79 using 59 PHA bins.
# Reduced chi-squared = 1.175 for 56 degrees of freedom
# Null hypothesis probability = 1.740017e-01
Photon flux (15-150 keV) in 1 sec: 0.287567 ( -0.165479 0.165849 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -0.492 sec. to 0.508 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 3.96850 ( 1.57865 1.57865 )
beta : -6.70725 ( 10 20 )
Epeak [keV] : 21.3596 ( -8.34008 -8.34008 )
Norm@50keV : 209.282 ( -209.286 5059.99 )
------------------------------------------------------------
# Chi-Squared = 65.80 using 59 PHA bins.
# Reduced chi-squared = 1.196 for 55 degrees of freedom
# Null hypothesis probability = 1.510060e-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] : 5.27131 (-2.3446 4.31747)
R^2/D10^2 : 2.02604 (-2.02619 32.264)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 66.02 using 59 PHA bins.
# Reduced chi-squared = 1.158 for 57 degrees of freedom
# Null hypothesis probability = 1.933374e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.059e-09 4.080e-09
25- 50 4.498e-09 3.259e-09
50-150 2.347e-10 2.684e-10
15-150 1.079e-08 7.910e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 18.2208 (-12.7764 71.3511)
Norm : 4.01306 (-4.01719 29.1817)
------------------------------------------------------------
# Chi-Squared = 66.39 using 59 PHA bins.
# Reduced chi-squared = 1.165 for 57 degrees of freedom
# Null hypothesis probability = 1.849349e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 5.726e-09 3.786e-09
25- 50 4.654e-09 3.645e-09
50-150 1.186e-09 1.549e-09
15-150 1.157e-08 8.040e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.08261 (-5.08269 -5.08269)
R1^2/D10^2 : 2.24922 (-2.25244 -2.25244)
kT2 [keV] : 12.4616 (-12.9857 -12.9857)
R2^2/D10^2 : 5.73823E-03 (-0.0046908 -0.0046908)
------------------------------------------------------------
# Chi-Squared = 66.00 using 59 PHA bins.
# Reduced chi-squared = 1.200 for 55 degrees of freedom
# Null hypothesis probability = 1.470740e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.027e-09 5.510e-09
25- 50 4.590e-09 5.965e-09
50-150 7.687e-10 2.532e-09
15-150 1.139e-08 1.892e-08
Plot creation:
Thu May 6 17:06:23 EDT 2010