batgrbproduct Analysis for Trigger=426048
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): Mon Jun 28 08:41:47 EDT 2010
Host Name: gcn5
Current Working Dir: /local/data/raid16/prebascript_archive/trigger426048/GCN5_download_cron
======================================================================
Trigger: 00426048 Segment: 000
BAT Trigger Time: 299339250.752 [s; MET]
Trigger Stop: 299339251.776 [s; MET]
UTC: 2010-06-27T13:47:24.820420 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 58.3947376445118 Dec: 0.916895839175858 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.63
Image Trigger?: NO
Rate S/N Ratio: 36.7151195013716 [ if not an image trigger ]
Image S/N Ratio: 6.63
Flight Position: [ source = BAT ]
RA: 58.3947376445118 Dec: 0.916895839175858 [deg; J2000]
Ground Position: [ source = BAT pre-slew burst ]
RA: 58.4597391791613 Dec: 1.00359855423773 [deg; J2000]
{ 03h 53m 50.3s , +01d 00' 13.0" }
+/- 3.72400148853483 [arcmin] (estimated 90% radius based on SNR)
+/- 2.12520378363554 [arcmin] (formal 1-sigma fit error)
SNR: 4.64932631816884
Angular difference between Flight and Ground position is 6.501457 arcmin
Partial Coding Fraction: 0.8984375 [ including projection effects ]
Duration
T90: 0.015999972820282 +/- 0.00565686571343518
Measured from: -2.37199985980988
to: -2.35599988698959 [s; relative to TRIGTIME]
T50: 0.0079999566078186 +/- 0.00565686571343518
Measured from: -2.36799985170364
to: -2.35999989509583 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: -2.86199998855591
to: -1.86199998855591 [s; relative to TRIGTIME]
Total Fluence
Measured from: -2.37199997901917
to: -2.35599994659424 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.003816 0.005188 0.001197 0.002461
0.001338 0.001397 0.001338 0.001445 [error]
Peak 0.002556 0.016905 0.006033 0.001739
0.010266 0.011709 0.010550 0.011870 [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 9.70e-10 1.19e-09 1.06e-09 1.64e-09 3.79e-09 4.86e-09 erg/cm2
Error 5.43e-10 5.73e-10 8.86e-10 3.40e-09 2.15e-09 4.36e-09 erg/cm2
Peak flux Power-law 6.94e-02 8.77e-02 8.08e-02 1.30e-01 2.82e-01 3.68e-01 ph/cm2/s
Error 1.01e-01 8.92e-02 8.07e-02 8.26e-01 2.73e-01 5.19e-01 ph/cm2/s
Fluence Cutoff-PL 1.19e-09 1.58e-09 1.92e-10 2.94e-09 0.00e+00 0.00e+00 erg/cm2
Error 5.76e-10 7.95e-10 4.09e-10 1.26e-09 0.00e+00 0.00e+00 erg/cm2
Peak flux Cutoff-PL 5.85e-02 1.34e-01 5.85e-02 2.20e-03 2.54e-01 2.54e-01 ph/cm2/s
Error 9.80e-02 1.29e-01 9.05e-02 8.74e-01 2.66e-01 5.41e-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 2.166 0.912 - - 2.53e-02 1.57e-02 58.130 57
CPL -4.893 0.000 27.6 6.0 3.11e+03 2.54e+03 53.200 56
=== 1-s peak spectral analysis ===
Model Ph_index Ph_90err Epeak Epeak_90err Norm Nomr_90err chi2 dof
PL 1.119 1.826 - - 2.43e-03 2.33e-03 49.010 57
CPL -4.884 0.000 43.1 -11.1 1.04e+01 1.06e+01 48.640 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 0.016 -2.372 -2.356
T90 0.016 -2.372 -2.356
T50 0.008 -2.368 -2.360
Peak 1.000 -2.862 -1.862
Image
Pre-slew 15-350 keV image (Event data; bkg subtracted)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name
58.4597 +1.0036 0.0412 26.2 -155.7 0.0130 4.6 TRIG_00426048
------------------------------------------
Foreground time interval of the image:
-2.372 -2.356 (delta_t = 0.016 [sec])
Background time interval of the image:
-60.752 -2.372 (delta_t = 58.380 [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 -2.372 sec. to -2.356 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 2.16566 ( -0.875331 0.949268 )
Norm@50keV : 2.53281E-02 ( -0.0153718 0.0160648 )
------------------------------------------------------------
# Chi-Squared = 58.13 using 59 PHA bins.
# Reduced chi-squared = 1.020 for 57 degrees of freedom
# Null hypothesis probability = 4.335708e-01
Photon flux (15-150 keV) in 0.016 sec: 4.11898 ( -1.86433 1.86644 ) ph/cm2/s
Energy fluence (15-150 keV) : 3.79402e-09 ( -1.96893e-09 2.32965e-09 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.372 sec. to -2.356 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.89346 ( )
Epeak [keV] : 27.6239 ( -5.46509 6.45277 )
Norm@50keV : 3105.69 ( -3105.21 1979.39 )
------------------------------------------------------------
# Chi-Squared = 53.20 using 59 PHA bins.
# Reduced chi-squared = 0.9500 for 56 degrees of freedom
# Null hypothesis probability = 5.815075e-01
Photon flux (15-150 keV) in 0.016 sec: 4.35717 ( -1.73574 1.73489 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -2.372 sec. to -2.356 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.98509 ( -140.089 -130.089 )
beta : -9.37161 ( 9.99997 7.6431 )
Epeak [keV] : 27.2759 ( -5.59251 6.75198 )
Norm@50keV : 3931.43 ( -2243.69 32611.3 )
------------------------------------------------------------
# Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9669 for 55 degrees of freedom
# Null hypothesis probability = 5.444223e-01
Photon flux (15-150 keV) in 0.016 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] : 6.93203 (-1.84666 2.55276)
R^2/D10^2 : 9.51291 (-9.49011 24.1341)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 54.81 using 59 PHA bins.
# Reduced chi-squared = 0.9615 for 57 degrees of freedom
# Null hypothesis probability = 5.578196e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.163e-09 7.744e-10
25- 50 1.563e-09 1.015e-09
50-150 2.500e-10 2.162e-10
15-150 2.976e-09 1.886e-09
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 32.5081 (-18.3247 -32.5128)
Norm : 31.7612 (-19.5426 43.0028)
------------------------------------------------------------
# Chi-Squared = 57.37 using 59 PHA bins.
# Reduced chi-squared = 1.007 for 57 degrees of freedom
# Null hypothesis probability = 4.612401e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.075e-09 7.021e-10
25- 50 1.282e-09 8.816e-10
50-150 7.783e-10 7.467e-10
15-150 3.136e-09 2.169e-09
Double BB
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT1 [keV] : 6.43550 (-6.93315 193.064)
R1^2/D10^2 : 11.9832 (-7.019 -7.019)
kT2 [keV] : 200.000 ( )
R2^2/D10^2 : 7.11610E-04 (-0.000704145 0.000831296)
------------------------------------------------------------
# Chi-Squared = 54.81 using 59 PHA bins.
# Chi-Squared = 53.18 using 59 PHA bins.
# Reduced chi-squared = 0.9965 for 55 degrees of freedom
# Reduced chi-squared = 0.9669 for 55 degrees of freedom
# Null hypothesis probability = 4.819872e-01
# Null hypothesis probability = 5.444228e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 1.163e-09 1.497e-01
25- 50 1.563e-09 1.234e+00
50-150 2.500e-10 2.926e+01
15-150 2.976e-09 2.822e+01
Peak spectrum fit
Power-law model
Time interval is from -2.862 sec. to -1.862 sec.
Spectral model in power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: 1.11855 ( -1.11875 2.53272 )
Norm@50keV : 2.42728E-03 ( -0.00242729 0.00223219 )
------------------------------------------------------------
# Chi-Squared = 49.01 using 59 PHA bins.
# Reduced chi-squared = 0.8598 for 57 degrees of freedom
# Null hypothesis probability = 7.653620e-01
Photon flux (15-150 keV) in 1 sec: 0.282073 ( -0.282073 0.26444 ) ph/cm2/s
Energy fluence (15-150 keV) : 2.52263e-08 ( -2.52263e-08 2.65974e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from -2.862 sec. to -1.862 sec.
Spectral model in the cutoff power-law:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
Photon index: -4.88439 ( )
Epeak [keV] : 43.1226 ( -20.7275 -42.9655 )
Norm@50keV : 10.4188 ( -10.148 10.9779 )
------------------------------------------------------------
# Chi-Squared = 48.64 using 59 PHA bins.
# Reduced chi-squared = 0.8685 for 56 degrees of freedom
# Null hypothesis probability = 7.470515e-01
Photon flux (15-150 keV) in 1 sec: 0.253825 ( -0.253825 0.279148 ) ph/cm2/s
Energy fluence (15-150 keV) : 0 ( 0 0 ) ergs/cm2
Band function
Time interval is from -2.862 sec. to -1.862 sec.
Spectral model in the Band function:
------------------------------------------------------------
Parameters : value lower 90% higher 90%
alpha : 4.85551 ( -15.1932 -15.1932 )
beta : -2.27360 ( 2.31406 2.31406 )
Epeak [keV] : 40.9852 ( -40.8247 320.53 )
Norm@50keV : 12.3517 ( -12.8708 18.4102 )
------------------------------------------------------------
# Chi-Squared = 48.34 using 59 PHA bins.
# Reduced chi-squared = 0.8789 for 55 degrees of freedom
# Null hypothesis probability = 7.251782e-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] : 13.1525 (-8.45999 -13.1525)
R^2/D10^2 : 5.58422E-02 (-0.0558423 1.43873)
(R is the radius in km and D10 is the distance to the source in units of 10 kpc)
------------------------------------------------------------
# Chi-Squared = 48.88 using 59 PHA bins.
# Reduced chi-squared = 0.8575 for 57 degrees of freedom
# Null hypothesis probability = 7.693564e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.048e-09 1.661e-09
25- 50 7.144e-09 5.450e-09
50-150 7.866e-09 8.620e-09
15-150 1.706e-08 1.401e-08
Thermal bremsstrahlung (OTTB)
Spectral model: thermal bremsstrahlung
------------------------------------------------------------
Parameters : value Lower 90% Upper 90%
kT [keV] : 199.363 (-200 -200)
Norm : 1.15016 (-1.08585 1.08585)
------------------------------------------------------------
# Chi-Squared = 49.17 using 59 PHA bins.
# Reduced chi-squared = 0.8626 for 57 degrees of freedom
# Null hypothesis probability = 7.601289e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 2.864e-09 2.366e-09
25- 50 5.509e-09 4.568e-09
50-150 1.208e-08 9.650e-09
15-150 2.046e-08 1.681e-08
Double BB
# Chi-Squared = 48.63 using 59 PHA bins.
# Chi-Squared = 48.52 using 59 PHA bins.
# Chi-Squared = 48.50 using 59 PHA bins.
# Reduced chi-squared = 0.8887 for 55 degrees of freedom
# Reduced chi-squared = 0.8858 for 55 degrees of freedom
# Reduced chi-squared = 0.8842 for 55 degrees of freedom
# Reduced chi-squared = 0.8822 for 55 degrees of freedom
# Reduced chi-squared = 0.8818 for 55 degrees of freedom
# Null hypothesis probability = 7.062617e-01
# Null hypothesis probability = 7.118475e-01
# Null hypothesis probability = 7.151298e-01
# Null hypothesis probability = 7.188609e-01
# Null hypothesis probability = 7.196275e-01
Energy Fluence 90% Error
[keV] [erg/cm2] [erg/cm2]
15- 25 0.000e+00 0.000e+00
25- 50 0.000e+00 0.000e+00
50-150 0.000e+00 0.000e+00
15-150 0.000e+00 0.000e+00
Plot creation:
Mon Jun 28 08:48:18 EDT 2010