batgrbproduct Analysis for Trigger=525451
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): Mon Jul 2 16:11:09 EDT 2012
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger525451/batgroup_hand_proc
======================================================================
Trigger: 00525451 Segment: 000
BAT Trigger Time: 362791062.144 [s; MET]
Trigger Stop: 362791062.656 [s; MET]
UTC: 2012-06-30T23:17:33.768120 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 352.284720356421 Dec: 42.509854645773 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.87
Image Trigger?: NO
Rate S/N Ratio: 13.856406460551 [ if not an image trigger ]
Image S/N Ratio: 6.87
Flight Position: [ source = BAT ]
RA: 352.284720356421 Dec: 42.509854645773 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 352.300057160142 Dec: 42.4948580432031 [deg; J2000]
{ 23h 29m 12.0s , +42d 29' 41.5" }
+/- 2.71807883642757 [arcmin] (estimated 90% radius based on SNR)
+/- 1.60849727278859 [arcmin] (formal 1-sigma fit error)
SNR: 7.29027690238135
Angular difference between Flight and Ground position is 1.126894 arcmin
Partial Coding Fraction: 0.65625 [ including projection effects ]
Duration
T90: 0.575999975204468 +/- 0.177673871033242
Measured from: -0.00800001621246338
to: 0.567999958992004 [s; relative to TRIGTIME]
T50: 0.247999966144562 +/- 0.192924898003564
Measured from: 0.208000004291534
to: 0.455999970436096 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.245999991893768
to: 0.754000008106232 [s; relative to TRIGTIME]
Total Fluence
Measured from: -0.120000004768372
to: 0.607999980449677 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.021289 0.022550 0.029707 0.009518
0.006286 0.006335 0.006058 0.004719 [error]
Peak 0.020064 0.026012 0.029792 0.006728
0.007318 0.007262 0.006842 0.005390 [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 4.76e-09 1.16e-08 2.25e-08 1.08e-07 6.08e-08 1.46e-07 erg/cm2
Error 2.36e-09 3.41e-09 5.51e-09 6.47e-08 1.44e-08 6.65e-08 erg/cm2
Peak flux Power-law 1.59e-01 2.10e-01 2.03e-01 3.52e-01 6.89e-01 9.24e-01 ph/cm2/s
Error 8.79e-02 7.01e-02 5.36e-02 2.14e-01 1.82e-01 2.42e-01 ph/cm2/s
Fluence Cutoff-PL 4.81e-09 1.17e-08 2.25e-08 1.07e-07 1.45e-07 0.00e+00 erg/cm2
Error 2.57e-09 3.42e-09 5.94e-09 9.23e-08 6.54e-08 0.00e+00 erg/cm2
Peak flux Cutoff-PL 1.59e-01 2.10e-01 2.04e-01 3.49e-01 6.89e-01 9.21e-01 ph/cm2/s
Error 1.28e-01 7.02e-02 5.84e-02 2.49e-01 1.82e-01 2.86e-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 1.042 0.429 - - 7.84e-03 1.83e-03 50.730 57
CPL 2.485 0.000 154.4 0.0 9.78e-04 0.00e+00 50.590 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.046 0.475 - - 5.97e-03 1.53e-03 56.170 57
CPL 2.643 0.000 195.0 0.0 5.66e-04 0.00e+00 55.960 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 0.728 -0.120 0.608
T90 0.576 -0.008 0.568
T50 0.248 0.208 0.456
Peak 1.000 -0.246 0.754
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
352.3001 42.4949 0.0263 33.9626 -30.4329 0.0856992 7.290 TRIG_00525451
Foreground time interval of the image:
-0.120 0.608 (delta_t = 0.728 [sec])
Background time interval of the image:
-60.144 -0.120 (delta_t = 60.024 [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 -0.120 sec. to 0.608 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04211 ( -0.443661 0.414207 )
Norm@50keV : 7.84127E-03 ( -0.00185208 0.00180593 )
------------------------------------------------------------
# Chi-Squared = 50.73 using 59 PHA bins.
# Reduced chi-squared = 0.8900 for 57 degrees of freedom
# Null hypothesis probability = 7.078400e-01
Photon flux (15-150 keV) in 0.728 sec: 0.905073 ( -0.217506 0.219288 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.08344e-08 ( -1.44081e-08 1.44519e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.120 sec. to 0.608 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.48513 ( )
Epeak [keV] : 154.403 ( )
Norm@50keV : 9.77630E-04 ( )
------------------------------------------------------------
# Chi-Squared = 50.59 using 59 PHA bins.
# Reduced chi-squared = 0.9033 for 56 degrees of freedom
# Null hypothesis probability = 6.792296e-01
Photon flux (15-150 keV) in 0.728 sec: 0.904889 ( -0.217142 0.219231 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.45342e-07 ( -5.44114e-08 7.63475e-08 ) ergs/cm2
Band function
Time interval is from -0.120 sec. to 0.608 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -1.74552 ( 1.7458 2.12151 )
beta : -1.04213 ( 1.04211 0.443665 )
Epeak [keV] : 141.452 ( -146.372 -146.372 )
Norm@50keV : 7.91058E-03 ( -0.00182061 376028 )
------------------------------------------------------------
# Chi-Squared = 50.73 using 59 PHA bins.
# Reduced chi-squared = 0.9224 for 55 degrees of freedom
# Null hypothesis probability = 6.383417e-01
Photon flux (15-150 keV) in 0.728 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] : 27.2386 (-7.24096 12.2342)
R^2/D10^2 : 1.64341E-02 (-0.0109197 0.0266099)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 55.59 using 59 PHA bins.
# Reduced chi-squared = 0.9752 for 57 degrees of freedom
# Null hypothesis probability = 5.282050e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.471e-09 8.724e-10
25- 50 8.699e-09 4.213e-09
50-150 4.704e-08 2.278e-08
15-150 5.721e-08 2.750e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.999 ( )
Norm : 3.80798 (-3.80798 -3.80798)
------------------------------------------------------------
# Chi-Squared = 55.67 using 59 PHA bins.
# Reduced chi-squared = 0.9766 for 57 degrees of freedom
# Null hypothesis probability = 5.252541e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.903e-09 3.873e-09
25- 50 1.328e-08 7.560e-09
50-150 2.912e-08 1.695e-08
15-150 4.930e-08 2.757e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.61509 (-2.60511 3.9586)
R1^2/D10^2 : 1.94101 (-1.71931 29.4205)
kT2 [keV] : 36.1298 (-11.6581 36.1408)
R2^2/D10^2 : 6.44810E-03 (-0.00528759 0.0144887)
------------------------------------------------------------
# Chi-Squared = 48.34 using 59 PHA bins.
# Reduced chi-squared = 0.8789 for 55 degrees of freedom
# Null hypothesis probability = 7.251168e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.197e-09 3.800e-09
25- 50 1.021e-08 5.536e-09
50-150 4.733e-08 2.698e-08
15-150 6.374e-08 3.412e-08
Peak spectrum fit
Power-law model
Time interval is from -0.246 sec. to 0.754 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.04610 ( -0.494671 0.455443 )
Norm@50keV : 5.96580E-03 ( -0.00154765 0.00150617 )
------------------------------------------------------------
# Chi-Squared = 56.17 using 59 PHA bins.
# Reduced chi-squared = 0.9854 for 57 degrees of freedom
# Null hypothesis probability = 5.063359e-01
Photon flux (15-150 keV) in 1 sec: 0.688875 ( -0.181447 0.183109 ) ph/cm2/s
Energy fluence (15-150 keV) : 6.34858e-08 ( -1.65186e-08 1.66396e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.246 sec. to 0.754 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.64304 ( )
Epeak [keV] : 194.960 ( )
Norm@50keV : 5.65652E-04 ( )
------------------------------------------------------------
# Chi-Squared = 55.96 using 59 PHA bins.
# Reduced chi-squared = 0.9992 for 56 degrees of freedom
# Null hypothesis probability = 4.764955e-01
Photon flux (15-150 keV) in 1 sec: 0.688665 ( -0.180682 0.182932 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.51558e-07 ( -1.51558e-07 9.0895e-08 ) ergs/cm2
Band function
Time interval is from -0.246 sec. to 0.754 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.785702 ( 0.776594 5.44975 )
beta : -1.05084 ( 1.05113 0.498783 )
Epeak [keV] : 91.1448 ( -96.8635 -96.8635 )
Norm@50keV : 9.94255E-03 ( -0.00557127 0 )
------------------------------------------------------------
# Chi-Squared = 56.16 using 59 PHA bins.
# Reduced chi-squared = 1.021 for 55 degrees of freedom
# Null hypothesis probability = 4.312465e-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] : 27.4975 (-8.17846 14.6146)
R^2/D10^2 : 1.20562E-02 (-0.0120524 0.0240136)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 60.36 using 59 PHA bins.
# Reduced chi-squared = 1.059 for 57 degrees of freedom
# Null hypothesis probability = 3.553938e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.502e-09 9.525e-10
25- 50 8.923e-09 5.146e-09
50-150 4.905e-08 2.920e-08
15-150 5.948e-08 3.250e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.999 ( )
Norm : 2.90240 (-2.9024 -2.9024)
------------------------------------------------------------
# Chi-Squared = 60.09 using 59 PHA bins.
# Reduced chi-squared = 1.054 for 57 degrees of freedom
# Null hypothesis probability = 3.643894e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.227e-09 4.197e-09
25- 50 1.390e-08 8.160e-09
50-150 3.049e-08 1.768e-08
15-150 5.162e-08 3.034e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.31887 (-2.75534 4.16426)
R1^2/D10^2 : 0.970464 (-0.842453 8.50725)
kT2 [keV] : 38.5976 (-13.8967 56.2193)
R2^2/D10^2 : 3.98508E-03 (-0.00347723 0.011212)
------------------------------------------------------------
# Chi-Squared = 53.82 using 59 PHA bins.
# Reduced chi-squared = 0.9786 for 55 degrees of freedom
# Null hypothesis probability = 5.197565e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 6.312e-09 3.865e-09
25- 50 1.146e-08 6.360e-09
50-150 4.916e-08 2.847e-08
15-150 6.693e-08 3.730e-08
Plot creation:
Mon Jul 2 16:24:22 EDT 2012