batgrbproduct Analysis for Trigger=421962
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): Sat May 15 17:34:44 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger421962/GCN5_download_cron
======================================================================
Trigger: 00421962 Segment: 000
BAT Trigger Time: 295556043.968 [s; MET]
Trigger Stop: 295556047.04 [s; MET]
UTC: 2010-05-14T18:53:58.170320 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 328.820890294865 Dec: 29.170486033985 [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: 9.64365076099295 [ if not an image trigger ]
Image S/N Ratio: 7.06
Flight Position: [ source = BAT ]
RA: 328.820890294865 Dec: 29.170486033985 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 328.75807623063 Dec: 29.1740419604084 [deg; J2000]
{ 21h 55m 01.9s , +29d 10' 26.6" }
+/- 2.45471325543958 [arcmin] (estimated 90% radius based on SNR)
+/- 1.05117929876266 [arcmin] (formal 1-sigma fit error)
SNR: 8.4328509832271
Angular difference between Flight and Ground position is 3.297706 arcmin
Partial Coding Fraction: 0.765625 [ including projection effects ]
Duration
T90: 17.7919999957085 +/- 8.1775497048575
Measured from: 0.928000152111053
to: 18.7200001478195 [s; relative to TRIGTIME]
T50: 9.28000003099442 +/- 6.20370988407297
Measured from: 3.68000012636185
to: 12.9600001573563 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 6.22000002861023
to: 7.22000002861023 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.287999987602234
to: 30.8159999847412 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.237442 0.281950 0.169304 0.010886
0.034235 0.034880 0.030690 0.026071 [error]
Peak 0.024532 0.034023 0.014985 0.005465
0.006254 0.006363 0.005706 0.004688 [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 8.55e-08 1.18e-07 1.20e-07 2.22e-07 3.94e-07 5.45e-07 erg/cm2
Error 1.61e-08 1.64e-08 2.89e-08 1.05e-07 6.70e-08 1.38e-07 erg/cm2
Peak flux Power-law 2.62e-01 2.15e-01 1.19e-01 9.76e-02 6.40e-01 6.94e-01 ph/cm2/s
Error 8.99e-02 5.24e-02 4.69e-02 7.41e-02 1.56e-01 1.75e-01 ph/cm2/s
Fluence Cutoff-PL 7.93e-08 1.31e-07 1.15e-07 5.48e-08 3.63e-07 3.80e-07 erg/cm2
Error 1.82e-08 2.29e-08 3.44e-08 1.68e-07 7.18e-08 1.52e-07 erg/cm2
Peak flux Cutoff-PL 2.45e-01 2.35e-01 1.19e-01 3.77e-02 6.26e-01 6.37e-01 ph/cm2/s
Error 9.96e-02 7.15e-02 5.67e-02 8.81e-02 1.58e-01 1.90e-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 1.02e-01 6.43e-01 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 1.976 0.257 - - 1.44e-03 2.55e-04 46.780 57
CPL 1.050 1.184 42.7 0.0 4.95e-03 0.00e+00 44.500 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.848 0.449 - - 4.55e-03 1.38e-03 48.750 57
CPL 1.117 1.859 50.8 0.0 1.21e-02 0.00e+00 48.210 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: 9.984000 sec.
T50 in the 50-300 keV band: 5.632000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 30.528 0.288 30.816
T90 17.792 0.928 18.720
T50 9.280 3.680 12.960
Peak 1.000 6.220 7.220
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
328.7581 +29.1740 0.0229 27.8 -35.1 0.6690 8.4 TRIG_00421962
------------------------------------------
Foreground time interval of the image:
0.288 5.165 (delta_t = 4.877 [sec])
6.032 30.816 (delta_t = 24.784 [sec])
Background time interval of the image:
-44.767 0.288 (delta_t = 45.055 [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
Multiple GTIs in the spectrum
tstart tstop
0.288000 5.165100
6.032000 30.816000
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.97583 ( -0.246703 0.266874 )
Norm@50keV : 1.44297E-03 ( -0.000258668 0.000251572 )
------------------------------------------------------------
# Chi-Squared = 46.78 using 59 PHA bins.
# Reduced chi-squared = 0.8207 for 57 degrees of freedom
# Null hypothesis probability = 8.308864e-01
Photon flux (15-150 keV) in 29.66 sec: 0.213982 ( -0.029402 0.0294032 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.94033e-07 ( -6.5941e-08 6.80083e-08 ) ergs/cm2
Cutoff power-law model
Multiple GTIs in the spectrum
tstart tstop
0.288000 5.165100
6.032000 30.816000
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.05028 ( -1.33689 1.03149 )
Epeak [keV] : 42.6599 ( )
Norm@50keV : 4.95278E-03 ( )
------------------------------------------------------------
# Chi-Squared = 44.50 using 59 PHA bins.
# Reduced chi-squared = 0.7947 for 56 degrees of freedom
# Null hypothesis probability = 8.658633e-01
Photon flux (15-150 keV) in 29.66 sec: 0.207688 ( -0.030065 0.030086 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.62712e-07 ( -6.86003e-08 7.49627e-08 ) ergs/cm2
Band function
Multiple GTIs in the spectrum
tstart tstop
0.288000 5.165100
6.032000 30.816000
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.06314 ( 1.42428 1.81354 )
beta : -10.00000 ( 6.08736e+11 6.08736e+11 )
Epeak [keV] : 42.6757 ( -41.5325 -42.6757 )
Norm@50keV : 4.87005E-03 ( -0.00487002 0.0253383 )
------------------------------------------------------------
# Chi-Squared = 44.50 using 59 PHA bins.
# Reduced chi-squared = 0.8091 for 55 degrees of freedom
# Null hypothesis probability = 8.433145e-01
Photon flux (15-150 keV) in 29.66 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] : 10.1232 (-1.53372 1.81418)
R^2/D10^2 : 9.67901E-02 (-0.0450127 0.0837808)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 52.37 using 59 PHA bins.
# Reduced chi-squared = 0.9189 for 57 degrees of freedom
# Null hypothesis probability = 6.489819e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.016e-08 1.493e-08
25- 50 1.522e-07 2.930e-08
50-150 8.228e-08 2.806e-08
15-150 2.946e-07 5.492e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 67.2324 (-22.7673 44.0706)
Norm : 1.07608 (-0.213011 0.267907)
------------------------------------------------------------
# Chi-Squared = 44.65 using 59 PHA bins.
# Reduced chi-squared = 0.7834 for 57 degrees of freedom
# Null hypothesis probability = 8.827557e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.151e-08 1.477e-08
25- 50 1.283e-07 2.107e-08
50-150 1.598e-07 6.524e-08
15-150 3.696e-07 7.941e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.05504 (-3.184 3.27502)
R1^2/D10^2 : 0.775520 (-0.621403 146.347)
kT2 [keV] : 15.3556 (-4.66486 13.6699)
R2^2/D10^2 : 1.49864E-02 (-0.014062 0.0570499)
------------------------------------------------------------
# Chi-Squared = 44.58 using 59 PHA bins.
# Reduced chi-squared = 0.8106 for 55 degrees of freedom
# Null hypothesis probability = 8.411326e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.029e-08 4.366e-08
25- 50 1.279e-07 6.576e-08
50-150 1.455e-07 8.840e-08
15-150 3.537e-07 1.861e-07
Peak spectrum fit
Power-law model
Time interval is from 6.220 sec. to 7.220 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.84813 ( -0.422897 0.47584 )
Norm@50keV : 4.55477E-03 ( -0.00141042 0.00134316 )
------------------------------------------------------------
# Chi-Squared = 48.75 using 59 PHA bins.
# Reduced chi-squared = 0.8553 for 57 degrees of freedom
# Null hypothesis probability = 7.734461e-01
Photon flux (15-150 keV) in 1 sec: 0.639740 ( -0.155977 0.155977 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.1882e-08 ( -1.23774e-08 1.303e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 6.220 sec. to 7.220 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11655 ( -2.65778 1.05988 )
Epeak [keV] : 50.8281 ( )
Norm@50keV : 1.20677E-02 ( )
------------------------------------------------------------
# Chi-Squared = 48.21 using 59 PHA bins.
# Reduced chi-squared = 0.8610 for 56 degrees of freedom
# Null hypothesis probability = 7.608799e-01
Photon flux (15-150 keV) in 1 sec: 0.626207 ( -0.158383 0.156799 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from 6.220 sec. to 7.220 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.20209 ( -5.38158 1.83371 )
beta : -9.37164 ( 10 20 )
Epeak [keV] : 53.1849 ( -27.0501 -53.0087 )
Norm@50keV : 1.06467E-02 ( -0.0106644 0.00733755 )
------------------------------------------------------------
# Chi-Squared = 48.22 using 59 PHA bins.
# Reduced chi-squared = 0.8768 for 55 degrees of freedom
# Null hypothesis probability = 7.292619e-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] : 10.1007 (-2.62645 3.96664)
R^2/D10^2 : 0.294885 (-0.209158 0.620184)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 51.05 using 59 PHA bins.
# Reduced chi-squared = 0.8957 for 57 degrees of freedom
# Null hypothesis probability = 6.965736e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.148e-09 3.146e-09
25- 50 1.550e-08 7.246e-09
50-150 8.329e-09 5.052e-09
15-150 2.998e-08 1.581e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 83.8425 (-45.0387 -83.8425)
Norm : 2.98939 (-0.850329 1.37112)
------------------------------------------------------------
# Chi-Squared = 48.24 using 59 PHA bins.
# Reduced chi-squared = 0.8463 for 57 degrees of freedom
# Null hypothesis probability = 7.891095e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.778e-09 3.064e-09
25- 50 1.295e-08 6.390e-09
50-150 1.885e-08 1.518e-08
15-150 3.958e-08 2.314e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.80478 (-6.75737 4.01482)
R1^2/D10^2 : 0.923988 (-0.7268 39.1711)
kT2 [keV] : 22.1068 (-21.8947 -21.8955)
R2^2/D10^2 : 1.00810E-02 (-0.00991026 0.288367)
------------------------------------------------------------
# Chi-Squared = 47.84 using 59 PHA bins.
# Reduced chi-squared = 0.8698 for 55 degrees of freedom
# Null hypothesis probability = 7.423298e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.578e-09 4.549e-09
25- 50 1.346e-08 7.910e-09
50-150 1.891e-08 1.114e-08
15-150 3.995e-08 2.046e-08
Plot creation:
Sat May 15 18:06:38 EDT 2010