batgrbproduct Analysis for Trigger=510341
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): Sun Dec 25 12:24:51 EST 2011
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger510341/GCN5_download_cron
======================================================================
Trigger: 00510341 Segment: 000
BAT Trigger Time: 346477845.504 [s; MET]
Trigger Stop: 346477849.6 [s; MET]
UTC: 2011-12-25T03:50:37.792220 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 13.1017626462844 Dec: 51.5887628616773 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 7.52
Image Trigger?: NO
Rate S/N Ratio: 10.3923048454133 [ if not an image trigger ]
Image S/N Ratio: 7.52
Flight Position: [ source = BAT ]
RA: 13.1017626462844 Dec: 51.5887628616773 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 13.1578791125362 Dec: 51.5728914784644 [deg; J2000]
{ 00h 52m 37.9s , +51d 34' 22.4" }
+/- 1.2767783221643 [arcmin] (estimated 90% radius based on SNR)
+/- 0.375396895360992 [arcmin] (formal 1-sigma fit error)
SNR: 21.4548166772175
Angular difference between Flight and Ground position is 2.298799 arcmin
Partial Coding Fraction: 0.9375 [ including projection effects ]
Duration
T90: 106.439999938011 +/- 26.6490667223479
Measured from: -8.34799987077713
to: 98.092000067234 [s; relative to TRIGTIME]
T50: 43.6239998936653 +/- 12.1908564658397
Measured from: -0.931999862194061
to: 42.6920000314713 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -4.39600002765656
to: -3.39600002765656 [s; relative to TRIGTIME]
Total Fluence
Measured from: -14.2760000228882
to: 111.051999986172 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.751799 0.928098 0.543250 0.069589
0.061910 0.063548 0.057036 0.051023 [error]
Peak 0.025375 0.042245 0.011078 0.006412
0.005805 0.005930 0.005364 0.004572 [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 2.19e-07 3.56e-07 4.36e-07 1.05e-06 1.31e-06 2.06e-06 erg/cm2
Error 2.77e-08 2.90e-08 5.53e-08 2.75e-07 1.29e-07 3.27e-07 erg/cm2
Peak flux Power-law 2.68e-01 2.22e-01 1.25e-01 1.04e-01 6.62e-01 7.20e-01 ph/cm2/s
Error 7.65e-02 4.60e-02 4.15e-02 6.57e-02 1.37e-01 1.55e-01 ph/cm2/s
Fluence Cutoff-PL 2.09e-07 3.75e-07 4.34e-07 4.86e-07 1.24e-06 1.50e-06 erg/cm2
Error 3.15e-08 3.90e-08 6.03e-08 5.28e-07 1.56e-07 5.63e-07 erg/cm2
Peak flux Cutoff-PL 2.24e-01 2.89e-01 9.38e-02 4.30e-03 6.11e-01 6.11e-01 ph/cm2/s
Error 9.80e-02 7.82e-02 7.91e-02 4.88e-02 1.43e-01 1.46e-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 1.706 0.150 - - 1.13e-03 1.04e-04 58.130 57
CPL 1.259 0.618 73.1 -25.8 2.00e-03 1.97e-03 56.630 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.829 0.368 - - 4.75e-03 1.21e-03 77.300 57
CPL -0.701 4.077 40.2 48.1 1.64e-01 0.00e+00 74.380 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: 25.344000 sec.
T50 in the 50-300 keV band: 14.400000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 125.328 -14.276 111.052
T90 106.440 -8.348 98.092
T50 43.624 -0.932 42.692
Peak 1.000 -4.396 -3.396
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
13.1579 +51.5729 0.0090 17.5 -137.6 1.6606 21.5 TRIG_00510341
------------------------------------------
Foreground time interval of the image:
-14.276 32.497 (delta_t = 46.773 [sec])
Background time interval of the image:
-239.504 -50.374 (delta_t = 189.130 [sec])
-49.504 -14.276 (delta_t = 35.228 [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 -14.276 sec. to 111.052 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.70590 ( -0.148421 0.151999 )
Norm@50keV : 1.13053E-03 ( -0.000105193 0.000103736 )
------------------------------------------------------------
# Chi-Squared = 58.13 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.334046e-01
Photon flux (15-150 keV) in 125.3 sec: 0.150458 ( -0.0122842 0.0122885 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.31096e-06 ( -1.27767e-07 1.29857e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -14.276 sec. to 111.052 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.25906 ( -0.719103 0.51768 )
Epeak [keV] : 73.0664 ( -21.5573 -73.0808 )
Norm@50keV : 2.00253E-03 ( -0.000940163 0.00299129 )
------------------------------------------------------------
# Chi-Squared = 56.63 using 59 PHA bins.
# Reduced chi-squared = 1.011 for 56 degrees of freedom
# Null hypothesis probability = 4.512221e-01
Photon flux (15-150 keV) in 125.3 sec: 0.147266 ( -0.013074 0.013034 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.24478e-06 ( -1.54179e-07 1.5802e-07 ) ergs/cm2
Band function
Time interval is from -14.276 sec. to 111.052 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.907597 ( 0.900942 0.900942 )
beta : -1.98850 ( 1.98452 0.352537 )
Epeak [keV] : 52.9077 ( -52.1465 57.168 )
Norm@50keV : 3.37286E-03 ( -0.00225589 73.2951 )
------------------------------------------------------------
# Chi-Squared = 55.84 using 59 PHA bins.
# Reduced chi-squared = 1.015 for 55 degrees of freedom
# Null hypothesis probability = 4.430556e-01
Photon flux (15-150 keV) in 125.3 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] : 11.7308 (-1.14071 1.28902)
R^2/D10^2 : 3.93364E-02 (-0.0125044 0.0180019)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 82.29 using 59 PHA bins.
# Reduced chi-squared = 1.444 for 57 degrees of freedom
# Null hypothesis probability = 1.584382e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.431e-07 2.002e-08
25- 50 4.385e-07 4.517e-08
50-150 3.573e-07 7.029e-08
15-150 9.389e-07 1.026e-07
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 118.636 (-16.7367 85.1653)
Norm : 0.642540 (-0.0645078 0.0772675)
------------------------------------------------------------
# Chi-Squared = 56.58 using 59 PHA bins.
# Reduced chi-squared = 0.9926 for 57 degrees of freedom
# Null hypothesis probability = 4.907889e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.098e-07 2.462e-08
25- 50 3.746e-07 3.559e-08
50-150 6.647e-07 1.106e-07
15-150 1.249e-06 1.271e-07
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.80118 (-2.17496 2.53833)
R1^2/D10^2 : 0.190897 (-0.113255 0.235736)
kT2 [keV] : 22.6450 (-6.96709 36.5408)
R2^2/D10^2 : 2.52952E-03 (-0.00230586 0.00822272)
------------------------------------------------------------
# Chi-Squared = 57.82 using 59 PHA bins.
# Reduced chi-squared = 1.051 for 55 degrees of freedom
# Null hypothesis probability = 3.714209e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.020e-07 7.305e-08
25- 50 3.826e-07 1.195e-07
50-150 6.448e-07 3.340e-07
15-150 1.229e-06 4.819e-07
Peak spectrum fit
Power-law model
Time interval is from -4.396 sec. to -3.396 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.82851 ( -0.351102 0.385312 )
Norm@50keV : 4.75096E-03 ( -0.00123239 0.00119136 )
------------------------------------------------------------
# Chi-Squared = 77.30 using 59 PHA bins.
# Reduced chi-squared = 1.356 for 57 degrees of freedom
# Null hypothesis probability = 3.801504e-02
Photon flux (15-150 keV) in 1 sec: 0.662050 ( -0.136576 0.136586 ) ph/cm2/s
Energy fluence (15-150 keV) : 4.37023e-08 ( -1.10395e-08 1.15885e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -4.396 sec. to -3.396 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -0.700756 ( -5.86575 2.28853 )
Epeak [keV] : 40.1929 ( -8.73614 87.3758 )
Norm@50keV : 0.164415 ( )
------------------------------------------------------------
# Chi-Squared = 74.38 using 59 PHA bins.
# Reduced chi-squared = 1.328 for 56 degrees of freedom
# Null hypothesis probability = 5.068157e-02
Photon flux (15-150 keV) in 1 sec: 0.610703 ( -0.14244 0.14448 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.37323e-08 ( -9.2059e-09 1.42262e-08 ) ergs/cm2
Band function
Time interval is from -4.396 sec. to -3.396 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 1.41983 ( -2.86058 -1.44121 )
beta : -3.04303 ( 3.05739 1.16036 )
Epeak [keV] : 37.9365 ( -10.6804 15.2457 )
Norm@50keV : 0.486050 ( -0.619027 51.9179 )
------------------------------------------------------------
# Chi-Squared = 73.44 using 59 PHA bins.
# Reduced chi-squared = 1.335 for 55 degrees of freedom
# Null hypothesis probability = 4.896248e-02
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] : 9.97082 (-1.78261 2.27246)
R^2/D10^2 : 0.335564 (-0.181909 0.365748)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 74.44 using 59 PHA bins.
# Reduced chi-squared = 1.306 for 57 degrees of freedom
# Null hypothesis probability = 6.031031e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.788e-09 2.595e-09
25- 50 1.681e-08 6.800e-09
50-150 8.697e-09 4.666e-09
15-150 3.229e-08 1.326e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 78.1569 (-36.7903 -78.1569)
Norm : 3.17387 (-0.823564 1.16312)
------------------------------------------------------------
# Chi-Squared = 75.95 using 59 PHA bins.
# Reduced chi-squared = 1.333 for 57 degrees of freedom
# Null hypothesis probability = 4.741912e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 8.223e-09 2.623e-09
25- 50 1.346e-08 5.311e-09
50-150 1.870e-08 1.390e-08
15-150 4.038e-08 2.219e-08
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 0.613154 (-0.764482 3.49361)
R1^2/D10^2 : 8.65347E+08 ( )
kT2 [keV] : 10.2626 (-1.90853 2.44461)
R2^2/D10^2 : 0.295320 (-0.134188 0.336743)
------------------------------------------------------------
# Chi-Squared = 73.49 using 59 PHA bins.
# Chi-Squared = 73.35 using 59 PHA bins.
# Reduced chi-squared = 1.336 for 55 degrees of freedom
# Reduced chi-squared = 1.334 for 55 degrees of freedom
# Null hypothesis probability = 4.854925e-02
# Null hypothesis probability = 4.964893e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.618e-09 3.165e-09
25- 50 1.646e-08 7.992e-09
50-150 9.147e-09 4.767e-09
15-150 3.223e-08 1.390e-08
Plot creation:
Sun Dec 25 12:41:34 EST 2011