batgrbproduct Analysis for Trigger=426438
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 8 downlinks after the trigger.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.46
Process Start Time (local time): Fri Jul 2 10:27:11 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger426438/SDC
======================================================================
Trigger: 00426438 Segment: 000
BAT Trigger Time: 299725433.152 [s; MET]
Trigger Stop: 299725433.28 [s; MET]
UTC: 2010-07-02T01:03:47.206620 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 245.70251985758 Dec: -56.5377013538901 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 14.19
Image Trigger?: NO
Rate S/N Ratio: 37.3764631820615 [ if not an image trigger ]
Image S/N Ratio: 14.19
Flight Position: [ source = BAT ]
RA: 245.70251985758 Dec: -56.5377013538901 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 245.69346243556 Dec: -56.5492773010251 [deg; J2000]
{ 16h 22m 46.4s , -56d 32' 57.4" }
+/- 1.41947776617607 [arcmin] (estimated 90% radius based on SNR)
+/- 0.573710453294368 [arcmin] (formal 1-sigma fit error)
SNR: 18.4413120440206
Angular difference between Flight and Ground position is 0.756420 arcmin
Partial Coding Fraction: 0.6171875 [ including projection effects ]
Duration
T90: 0.163999974727631 +/- 0.0341760075028058
Measured from: 0.043999969959259
to: 0.20799994468689 [s; relative to TRIGTIME]
T50: 0.0799999833106995 +/- 0.0178885267601734
Measured from: 0.0719999670982361
to: 0.151999950408936 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -0.361999988555908
to: 0.638000011444092 [s; relative to TRIGTIME]
Total Fluence
Measured from: 0.0360000133514404
to: 0.236000001430511 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.042792 0.066676 0.061066 0.016453
0.005305 0.005470 0.005048 0.003477 [error]
Peak 0.050359 0.095959 0.063433 0.016854
0.009669 0.009073 0.007835 0.006213 [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 1.63e-08 2.92e-08 4.03e-08 1.15e-07 1.16e-07 2.01e-07 erg/cm2
Error 2.42e-09 2.74e-09 4.53e-09 2.71e-08 1.12e-08 3.07e-08 erg/cm2
Peak flux Power-law 7.56e-01 6.81e-01 4.23e-01 4.00e-01 2.03e+00 2.26e+00 ph/cm2/s
Error 1.40e-01 8.11e-02 6.38e-02 1.19e-01 2.39e-01 2.58e-01 ph/cm2/s
Fluence Cutoff-PL 1.41e-08 3.12e-08 4.33e-08 5.20e-08 1.13e-07 1.41e-07 erg/cm2
Error 2.95e-09 3.28e-09 5.42e-09 3.63e-08 1.16e-08 3.73e-08 erg/cm2
Peak flux Cutoff-PL 6.35e-01 7.43e-01 4.55e-01 1.62e-01 1.95e+00 2.00e+00 ph/cm2/s
Error 1.68e-01 9.95e-02 7.50e-02 2.79e-01 0.00e+00 0.00e+00 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 6.59e-01 2.04e+00 0.00e+00 0.00e+00 0.00e+00 0.00e+00 ph/cm2/s
Error 2.87e-01 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 1.537 0.146 - - 6.16e-02 5.54e-03 59.350 57
CPL 0.838 0.627 89.5 88.5 1.33e-01 1.00e-01 55.060 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.687 0.193 - - 1.53e-02 1.84e-03 65.450 57
CPL 0.710 0.881 65.3 41.1 4.82e-02 6.31e-02 60.940 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: 0.192000 sec.
T50 in the 50-300 keV band: 0.128000 sec.
=== Table of the duration information ==
Value tstart tstop
T100 0.200 0.036 0.236
T90 0.164 0.044 0.208
T50 0.080 0.072 0.152
Peak 1.000 -0.362 0.638
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
245.6935 -56.5493 0.0104 37.9 -154.4 0.1896 18.4 TRIG_00426438
------------------------------------------
Foreground time interval of the image:
0.036 0.236 (delta_t = 0.200 [sec])
Background time interval of the image:
-239.152 0.036 (delta_t = 239.188 [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 0.036 sec. to 0.236 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.53686 ( -0.144486 0.147023 )
Norm@50keV : 6.15646E-02 ( -0.0055441 0.00552937 )
------------------------------------------------------------
# Chi-Squared = 59.35 using 59 PHA bins.
# Reduced chi-squared = 1.041 for 57 degrees of freedom
# Null hypothesis probability = 3.898384e-01
Photon flux (15-150 keV) in 0.2 sec: 7.76441 ( -0.712823 0.71431 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.16137e-07 ( -1.11419e-08 1.1187e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.036 sec. to 0.236 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.838496 ( -0.670641 0.582665 )
Epeak [keV] : 89.5434 ( -21.766 155.21 )
Norm@50keV : 0.132835 ( -0.0617035 0.138317 )
------------------------------------------------------------
# Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 0.9832 for 56 degrees of freedom
# Null hypothesis probability = 5.105544e-01
Photon flux (15-150 keV) in 0.2 sec: 7.55880 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.13397e-07 ( -1.16318e-08 1.1587e-08 ) ergs/cm2
Band function
Time interval is from 0.036 sec. to 0.236 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.838814 ( -0.324851 0.773676 )
beta : -10.00000 ( 3.62704e+10 3.62704e+10 )
Epeak [keV] : 89.5520 ( -21.7868 155.189 )
Norm@50keV : 0.132776 ( -0.0616543 0.138438 )
------------------------------------------------------------
# Chi-Squared = 55.06 using 59 PHA bins.
# Reduced chi-squared = 1.001 for 55 degrees of freedom
# Null hypothesis probability = 4.724676e-01
Photon flux (15-150 keV) in 0.2 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] : 16.1886 (-1.64818 1.83971)
R^2/D10^2 : 0.692449 (-0.218627 0.316565)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 77.07 using 59 PHA bins.
# Reduced chi-squared = 1.352 for 57 degrees of freedom
# Null hypothesis probability = 3.948855e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 7.484e-09 1.235e-09
25- 50 3.181e-08 4.240e-09
50-150 5.852e-08 9.820e-09
15-150 9.782e-08 1.058e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-77.8679 -199.997)
Norm : 31.9504 (-2.81458 2.81602)
------------------------------------------------------------
# Chi-Squared = 56.55 using 59 PHA bins.
# Reduced chi-squared = 0.9922 for 57 degrees of freedom
# Null hypothesis probability = 4.917495e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.591e-08 8.359e-09
25- 50 3.061e-08 1.634e-08
50-150 6.713e-08 3.546e-08
15-150 1.137e-07 5.995e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 5.83571 (-1.78874 2.44785)
R1^2/D10^2 : 12.9482 (-9.1016 28.4954)
kT2 [keV] : 21.8541 (-3.47283 5.60863)
R2^2/D10^2 : 0.203636 (-0.121615 0.194949)
------------------------------------------------------------
# Chi-Squared = 53.86 using 59 PHA bins.
# Reduced chi-squared = 0.9793 for 55 degrees of freedom
# Null hypothesis probability = 5.181153e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.486e-08 7.319e-09
25- 50 2.957e-08 9.570e-09
50-150 6.871e-08 2.238e-08
15-150 1.131e-07 3.793e-08
Peak spectrum fit
Power-law model
Time interval is from -0.362 sec. to 0.638 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.68701 ( -0.190003 0.195331 )
Norm@50keV : 1.53423E-02 ( -0.00185262 0.00183635 )
------------------------------------------------------------
# Chi-Squared = 65.45 using 59 PHA bins.
# Reduced chi-squared = 1.148 for 57 degrees of freedom
# Null hypothesis probability = 2.068125e-01
Photon flux (15-150 keV) in 1 sec: 2.02846 ( -0.238245 0.238835 ) ph/cm2/s
Energy fluence (15-150 keV) : 1.42203e-07 ( -1.78447e-08 1.8007e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -0.362 sec. to 0.638 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 0.709890 ( -0.964368 0.798545 )
Epeak [keV] : 65.3180 ( -14.0699 68.0726 )
Norm@50keV : 4.81996E-02 ( -0.0288536 0.0974029 )
------------------------------------------------------------
# Chi-Squared = 60.94 using 59 PHA bins.
# Reduced chi-squared = 1.088 for 56 degrees of freedom
# Null hypothesis probability = 3.027773e-01
Photon flux (15-150 keV) in 1 sec: 1.94841 ( ) ph/cm2/s
Energy fluence (15-150 keV) : 1.34516e-07 ( -1.8747e-08 1.9066e-08 ) ergs/cm2
Band function
Time interval is from -0.362 sec. to 0.638 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : -0.709555 ( -0.741123 1.1078 )
beta : -10.00000 ( 1.72422e+10 1.72422e+10 )
Epeak [keV] : 65.2956 ( -14.0582 68.0721 )
Norm@50keV : 4.82212E-02 ( -0.0288783 0.0974662 )
------------------------------------------------------------
# Chi-Squared = 60.94 using 59 PHA bins.
# Reduced chi-squared = 1.108 for 55 degrees of freedom
# Null hypothesis probability = 2.708180e-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] : 13.9142 (-1.78202 2.02865)
R^2/D10^2 : 0.297271 (-0.116517 0.191917)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 72.10 using 59 PHA bins.
# Reduced chi-squared = 1.265 for 57 degrees of freedom
# Null hypothesis probability = 8.588145e-02
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.216e-08 2.568e-09
25- 50 4.496e-08 7.180e-09
50-150 5.714e-08 1.334e-08
15-150 1.143e-07 1.840e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 131.054 (-14.9514 -100.53)
Norm : 8.60473 (-1.16059 1.38463)
------------------------------------------------------------
# Chi-Squared = 62.29 using 59 PHA bins.
# Reduced chi-squared = 1.093 for 57 degrees of freedom
# Null hypothesis probability = 2.936442e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.232e-08 3.655e-09
25- 50 4.052e-08 5.750e-09
50-150 7.540e-08 1.107e-08
15-150 1.382e-07 1.660e-08
Double BB
Spectral model: bbodyrad<1> + bbodyrad<2>
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.71759 (-2.65579 3.07308)
R1^2/D10^2 : 2.21499 (-1.52927 11.6548)
kT2 [keV] : 20.4638 (-4.74897 10.4069)
R2^2/D10^2 : 5.56629E-02 (-0.0456284 0.108793)
------------------------------------------------------------
# Chi-Squared = 60.32 using 59 PHA bins.
# Reduced chi-squared = 1.097 for 55 degrees of freedom
# Null hypothesis probability = 2.895255e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.981e-08 1.082e-08
25- 50 4.190e-08 2.159e-08
50-150 7.285e-08 4.092e-08
15-150 1.345e-07 7.090e-08
Plot creation:
Fri Jul 2 11:43:36 EDT 2010