batgrbproduct Analysis for Trigger=421695
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): Wed May 12 05:39:58 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger421695/GCN5_download_cron
======================================================================
Trigger: 00421695 Segment: 000
BAT Trigger Time: 295271444.8 [s; MET]
Trigger Stop: 295271444.832 [s; MET]
UTC: 2010-05-11T11:50:39.012300 [includes UTCF correction]
Where From?: (*SHORT BURST*) TDRSS scaled map message
BAT
RA: 280.611745486353 Dec: 18.3279540117136 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.65
Image Trigger?: NO
Rate S/N Ratio: 6.557438524302 [ if not an image trigger ]
Image S/N Ratio: 6.65
Flight Position: [ source = BAT ]
RA: 280.611745486353 Dec: 18.3279540117136 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 280.62231202079 Dec: 18.3247553318699 [deg; J2000]
{ 18h 42m 29.4s , +18d 19' 29.1" }
+/- 3.07426491159627 [arcmin] (estimated 90% radius based on SNR)
+/- 1.93703532427543 [arcmin] (formal 1-sigma fit error)
SNR: 6.11427701469335
Angular difference between Flight and Ground position is 0.631697 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
T50: 0.0320000052452087 +/-
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
WARNING: battblocks failed. Used TDRSS fore/background intervals
Fluence
Peak Flux (peak 0.0320000052452087 second)
Measured from: -2.98023223876953e-08
to: 0.0319999754428864 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0
to: 0.0320000052452087 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.006115 0.004892 0.001988 0.000599
0.001574 0.001392 0.001160 0.001235 [error]
Peak 0.006115 0.004892 0.001988 0.000599
0.001574 0.001392 0.001160 0.001235 [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 1.20e-09 4.74e-10 1.09e-10 3.02e-11 1.80e-09 1.82e-09 erg/cm2
Error 5.85e-10 2.26e-10 7.40e-11 3.51e-11 8.21e-10 8.25e-10 erg/cm2
Peak flux Power-law 1.30e+00 2.92e-01 3.34e-02 4.22e-03 1.63e+00 1.63e+00 ph/cm2/s
Error 6.20e-01 1.35e-01 2.21e-02 4.70e-03 7.43e-01 7.43e-01 ph/cm2/s
Fluence Cutoff-PL 1.20e-09 4.74e-10 1.09e-10 3.00e-11 1.81e-09 1.82e-09 erg/cm2
Error 5.85e-10 2.26e-10 7.40e-11 3.49e-11 8.22e-10 8.26e-10 erg/cm2
Peak flux Cutoff-PL 1.59e+00 1.25e+00 8.41e-02 9.29e-05 2.93e+00 2.93e+00 ph/cm2/s
Error 6.23e-01 4.41e-01 5.01e-02 2.33e-04 9.54e-01 9.54e-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 4.123 0.647 - - 2.33e-03 1.85e-03 46.940 57
CPL 1.000 0.000 50.0 0.0 2.06e-03 0.00e+00 58.170 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 4.129 0.637 - - 2.36e-03 1.86e-03 47.250 57
CPL 1.000 0.000 50.0 0.0 2.07e-03 0.00e+00 59.090 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 0.032 0.000 0.032
T90 0.032 0.000 0.032
T50 0.032 0.000 0.032
Peak 0.032 -0.000 0.032
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
280.6223 +18.3248 0.0315 24.4 -76.4 0.0141 6.1 TRIG_00421695
------------------------------------------
Foreground time interval of the image:
0.000 0.032 (delta_t = 0.032 [sec])
Background time interval of the image:
-60.800 -24.670 (delta_t = 36.130 [sec])
-23.800 -4.800 (delta_t = 19.000 [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 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.12299 ( -0.541289 0.752409 )
Norm@50keV : 2.33420E-03 ( -0.00233764 0.00135874 )
------------------------------------------------------------
# Chi-Squared = 46.94 using 59 PHA bins.
# Reduced chi-squared = 0.8235 for 57 degrees of freedom
# Null hypothesis probability = 8.265199e-01
Photon flux (15-150 keV) in 0.032 sec: 1.60549 ( -0.751992 0.751401 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80396e-09 ( -8.2153e-10 8.21184e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.05591E-03 ( )
------------------------------------------------------------
# Chi-Squared = 58.17 using 59 PHA bins.
# Reduced chi-squared = 1.039 for 56 degrees of freedom
# Null hypothesis probability = 3.955433e-01
Photon flux (15-150 keV) in 0.032 sec: 2.90617 ( -0.9617 0.96176 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.80528e-09 ( -8.21869e-10 8.216e-10 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.95470 ( 91.4628 101.365 )
beta : -4.12333 ( -0.751783 0.542599 )
Epeak [keV] : 71.5494 ( -71.5494 -71.5494 )
Norm@50keV : 0.317568 ( -0.189782 0.184383 )
------------------------------------------------------------
# Chi-Squared = 46.94 using 59 PHA bins.
# Reduced chi-squared = 0.8535 for 55 degrees of freedom
# Null hypothesis probability = 7.718613e-01
Photon flux (15-150 keV) in 0.032 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] : 6.48051 (-1.0791 0.744375)
R^2/D10^2 : 8.36183 (-4.28624 10.1187)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 34.81 using 59 PHA bins.
# Reduced chi-squared = 0.6108 for 57 degrees of freedom
# Null hypothesis probability = 9.910488e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.654e-09 7.242e-10
25- 50 1.942e-09 9.149e-10
50-150 2.415e-10 1.596e-10
15-150 3.838e-09 1.617e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 14.0808 (-3.5211 3.22984)
Norm : 48.0650 (-23.2764 31.6059)
------------------------------------------------------------
# Chi-Squared = 40.12 using 59 PHA bins.
# Reduced chi-squared = 0.7039 for 57 degrees of freedom
# Null hypothesis probability = 9.560851e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.655e-09 6.870e-10
25- 50 1.059e-09 4.858e-10
50-150 1.637e-10 1.088e-10
15-150 2.878e-09 1.217e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.50676 (-6.50126 3.46684)
R1^2/D10^2 : 8.10728 (-8.12623 -8.12623)
kT2 [keV] : 6.29013 (-6.21986 -6.21986)
R2^2/D10^2 : 0.114338 (-0.127756 -0.127756)
------------------------------------------------------------
# Chi-Squared = 34.82 using 59 PHA bins.
# Reduced chi-squared = 0.6330 for 55 degrees of freedom
# Null hypothesis probability = 9.847031e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.646e-09 9.634e-04
25- 50 1.946e-09 8.758e-03
50-150 2.454e-10 1.989e-01
15-150 3.837e-09 2.082e-01
Peak spectrum fit
Power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 4.12931 ( -0.530065 0.742976 )
Norm@50keV : 2.35569E-03 ( -0.00235789 0.00135505 )
------------------------------------------------------------
# Chi-Squared = 47.25 using 59 PHA bins.
# Reduced chi-squared = 0.8290 for 57 degrees of freedom
# Null hypothesis probability = 8.178921e-01
Photon flux (15-150 keV) in 0.032 sec: 1.62877 ( -0.742921 0.742266 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82848e-09 ( -8.12285e-10 8.12022e-10 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.00000 ( )
Epeak [keV] : 50.0000 ( )
Norm@50keV : 2.06856E-03 ( )
------------------------------------------------------------
# Chi-Squared = 59.09 using 59 PHA bins.
# Reduced chi-squared = 1.055 for 56 degrees of freedom
# Null hypothesis probability = 3.634662e-01
Photon flux (15-150 keV) in 0.032 sec: 2.92744 ( -0.95462 0.95362 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.82979e-09 ( -8.12598e-10 8.124e-10 ) ergs/cm2
Band function
Time interval is from 0.000 sec. to 0.032 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -9.95392 ( 89.804 99.7029 )
beta : -4.13015 ( -0.742159 0.531105 )
Epeak [keV] : 71.3850 ( -71.385 -71.385 )
Norm@50keV : 0.320238 ( -0.189367 0.183907 )
------------------------------------------------------------
# Chi-Squared = 47.25 using 59 PHA bins.
# Reduced chi-squared = 0.8592 for 55 degrees of freedom
# Null hypothesis probability = 7.617853e-01
Photon flux (15-150 keV) in 0.032 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] : 6.47202 (-1.07767 0.738986)
R^2/D10^2 : 8.46517 (-4.29477 10.1838)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 35.04 using 59 PHA bins.
# Reduced chi-squared = 0.6147 for 57 degrees of freedom
# Null hypothesis probability = 9.903130e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.668e-09 6.866e-10
25- 50 1.953e-09 8.224e-10
50-150 2.415e-10 1.510e-10
15-150 3.862e-09 1.721e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 13.5361 (-3.00738 3.74099)
Norm : 50.0291 (-18.1007 30.3359)
------------------------------------------------------------
# Chi-Squared = 40.38 using 59 PHA bins.
# Reduced chi-squared = 0.7084 for 57 degrees of freedom
# Null hypothesis probability = 9.531691e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.700e-09 3.861e-09
25- 50 1.050e-09 3.650e-09
50-150 1.505e-10 1.345e-09
15-150 2.901e-09 9.006e-09
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.49716 (-6.49674 0.715592)
R1^2/D10^2 : 8.32385 (-8.31523 -8.31523)
kT2 [keV] : 4.76324 (-5.95831 -5.95831)
R2^2/D10^2 : 3.89028E-02 (-0.000760387 -0.000760387)
------------------------------------------------------------
# Chi-Squared = 35.04 using 59 PHA bins.
# Reduced chi-squared = 0.6372 for 55 degrees of freedom
# Null hypothesis probability = 9.835356e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.663e-09 5.400e-05
25- 50 1.961e-09 4.710e-04
50-150 2.461e-10 1.197e-02
15-150 3.870e-09 1.167e-02
Plot creation:
Wed May 12 05:59:10 EDT 2010