Analysis Summary
Notes:
- 1) No attempt has been made to eliminate the non-significant decimal places.
- 2) This batgrbproduct analysis is done using the HEASARC data.
- 3) This batgrbproduct analysis is using the flight position for the mask-weighting calculation.
======================================================================
BAT GRB EVENT DATA PROCESSING REPORT
Process Script Ver: batgrbproduct v2.48
Process Start Time: Sat Oct 19 15:27:17 EDT 2024
Host Name: batproc1
Current Working Dir: /local/data/bat1/alien/Swift_3rdBATcatalog/event/batevent_reproc/trigger1222955
======================================================================
Trigger: 01222955 Segment: 000
BAT Trigger Time: 735184114.432 [s; MET]
Trigger Stop: 735184118.528 [s; MET]
UTC: 2024-04-19T01:48:01.136900 [includes UTCF correction]
Where From?: TDRSS position message
BAT
RA: 94.567774527607 Dec: -45.0114988670489 [deg; J2000]
Catalogged Source?: NO
Point Source?: YES
GRB Indicated?: YES [ by BAT flight software ]
Image S/N Ratio: 6.72
Image Trigger?: NO
Rate S/N Ratio: 10.6770782520313 [ if not an image trigger ]
Image S/N Ratio: 6.72
Analysis Position: [ source = BAT ]
RA: 94.567774527607 Dec: -45.0114988670489 [deg; J2000]
Refined Position: [ source = BAT pre-slew burst ]
RA: 94.550620947569 Dec: -44.9724485243922 [deg; J2000]
{ 06h 18m 12.1s , -44d 58' 20.8" }
+/- 3.17399359839268 [arcmin] (estimated 90% radius based on SNR)
+/- 1.50069880572916 [arcmin] (formal 1-sigma fit error)
SNR: 5.84168740330559
Angular difference between the analysis and refined position is 2.453474 arcmin
Partial Coding Fraction: 0.9140625 [ including projection effects ]
Duration
T90: 114.256000041962 +/- 33.1346464522303
Measured from: -72.7240000963211
to: 41.5319999456406 [s; relative to TRIGTIME]
T50: 57.8159999847412 +/- 36.7354086676877
Measured from: -56.0760000944138
to: 1.73999989032745 [s; relative to TRIGTIME]
Fluence
Peak Flux (peak 1 second)
Measured from: 0.351999998092651
to: 1.35199999809265 [s; relative to TRIGTIME]
Total Fluence
Measured from: -74.0360000133514
to: 46.3679999113083 [s; relative to TRIGTIME]
Band 1 Band 2 Band 3 Band 4
15-25 25-50 50-100 100-350 keV
Total 0.373640 0.339501 0.329486 0.061960
0.061390 0.063357 0.054870 0.048572 [error]
Peak 0.023119 0.030964 0.030304 0.005122
0.005891 0.006361 0.005499 0.004659 [error]
[ fluence units of on-axis counts / fully illuminated detector ]
======================================================================
====== Table of the duration information =============================
Value tstart tstop
T100 120.404 -74.036 46.368
T90 114.256 -72.724 41.532
T50 57.816 -56.076 1.740
Peak 1.000 0.352 1.352
====== Spectral Analysis Summary =====================================
Model : spectral model: simple power-law (PL) and cutoff power-law (CPL)
Ph_index : photon index: E^{Ph_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 both the PL model and CPL model
Nomr_90err : 90% error of the normalization
chi2 : Chi-Squared
dof : degree of freedo
=== Time-averaged spectral analysis ===
(Best model with acceptable fit: N/A)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.643 -0.330 0.312 - - - 5.60e-04 -1.06e-04 1.02e-04 82.290 57
CPL -1.647 -0.326 0.320 9999.360 -9999.350 -9999.360 5.60e-04 -1.06e-04 7.55e-04 82.290 56
=== 1-s peak spectral analysis ===
(Best model with acceptable fit: PL)
Model Ph_index Ph_90err_low Ph_90err_hi Epeak Epeak_90err_low Epeak_90err_hi Norm Nomr_90err_low Norm_90err_hi chi2 dof
PL -1.348 -0.339 0.337 - - - 5.84e-03 -1.15e-03 1.14e-03 53.760 57
CPL -1.079 -1.629 1.524 178.730 -178.730 -178.730 7.92e-03 -3.18e-03 3.33e-02 53.620 56
=== 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 PL 9.85e-08 1.66e-07 2.12e-07 5.47e-07 6.28e-07 1.02e-06 erg/cm2
90%_error_low -2.52e-08 -2.70e-08 -5.51e-08 -2.48e-07 -1.25e-07 -3.05e-07 erg/cm2
90%_error_hi 2.65e-08 2.70e-08 5.49e-08 3.59e-07 1.29e-07 3.97e-07 erg/cm2
Peak flux PL 2.08e-01 2.29e-01 1.80e-01 2.33e-01 7.03e-01 8.49e-01 ph/cm2/s
90%_error_low -6.74e-02 -4.87e-02 -4.39e-02 -9.88e-02 -1.37e-01 -1.70e-01 ph/cm2/s
90%_error_hi 7.36e-02 4.76e-02 4.29e-02 1.36e-01 1.37e-01 1.75e-01 ph/cm2/s
Fluence CPL 9.98e-08 1.29e-07 2.10e-07 6.13e-07 6.28e-07 1.01e-06 erg/cm2
90%_error_low -2.68e-08 -4.06e-08 -6.74e-08 -4.23e-07 -1.25e-07 -4.04e-07 erg/cm2
90%_error_hi 2.55e-08 2.84e-08 7.01e-08 9.72e-08 1.29e-07 1.59e-07 erg/cm2
Peak flux CPL 1.97e-01 2.35e-01 1.85e-01 1.72e-01 6.96e-01 7.89e-01 ph/cm2/s
90%_error_low -8.31e-02 -5.30e-02 -4.76e-02 -1.72e-01 -1.41e-01 -2.05e-01 ph/cm2/s
90%_error_hi 8.16e-02 5.72e-02 5.10e-02 8.99e-02 1.40e-01 2.29e-01 ph/cm2/s
======================================================================
Image
Pre-slew 15.0-350.0 keV image (Event data)
# RAcent DECcent POSerr Theta Phi Peak Cts SNR Name 94.5506 -44.9724 0.0329 11.7149 65.6685 0.8689872 5.842 TRIG_01222955 Foreground time interval of the image: -74.036 46.368 (delta_t = 120.404 [sec]) Background time interval of the image: -239.432 -74.036 (delta_t = 165.396 [sec])
Light Curves
Note: The mask-weighted lightcurves have units of either count/det or counts/sec/det, where a det is 0.4 x 0.4 = 0.16 sq cm.
Full-time range; 1 s binning
Other quick-look light curves:
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
- 64 ms binning (zoomed)
- 16 ms binning (zoomed)
- 8 ms binning (zoomed)
- 2 ms binning (zoomed)
- SN=5 or 10 s binning (full-time range)
- Raw light curve
Spectra
Notes:
- 1) The fitting includes the systematic errors.
- 2) When the burst includes telescope slew time periods, the fitting uses an average response file made from multiple 5-s response files through out the slew time plus single time preiod for the non-slew times, and weighted by the total counts in the corresponding time period using addrmf. An average response file is needed becuase a spectral fit using 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.
Time averaged spectrum fit using the average DRM
Power-law model
Time interval is from -74.036 sec. to 46.368 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64309 ( -0.329535 0.312282 ) Norm@50keV : 5.60273E-04 ( -0.000106256 0.000101947 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 82.29 using 59 bins. Reduced chi-squared = 1.44368 # Null hypothesis probability of 1.58e-02 with 57 degrees of freedom Photon flux (15-150 keV) in 120.4 sec: 7.29948E-02 ( -0.0118604 0.0118661 ) ph/cm2/s Energy fluence (15-150 keV) : 6.27894e-07 ( -1.25359e-07 1.28828e-07 ) ergs/cm2
Cutoff power-law model
Time interval is from -74.036 sec. to 46.368 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.64708 ( -0.326613 0.319284 ) Epeak [keV] : 9999.36 ( -9999.35 -9999.36 ) Norm@50keV : 5.60435E-04 ( -0.000106027 0.000754743 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 82.29 using 59 bins. Reduced chi-squared = 1.46946 # Null hypothesis probability of 1.26e-02 with 56 degrees of freedom Photon flux (15-150 keV) in 120.4 sec: 7.31360E-02 ( -0.0120862 0.0118175 ) ph/cm2/s Energy fluence (15-150 keV) : 6.2762e-07 ( -1.24969e-07 1.28876e-07 ) ergs/cm2
1-s peak spectrum fit
Power-law model
Time interval is from 0.352 sec. to 1.352 sec. Spectral model in power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.34787 ( -0.338771 0.337288 ) Norm@50keV : 5.83821E-03 ( -0.00114738 0.00113923 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.76 using 59 bins. Reduced chi-squared = 0.943158 # Null hypothesis probability of 5.97e-01 with 57 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.703038 ( -0.137045 0.137272 ) ph/cm2/s Energy fluence (15-150 keV) : 5.70545e-08 ( -1.25207e-08 1.27286e-08 ) ergs/cm2
Cutoff power-law model
Time interval is from 0.352 sec. to 1.352 sec. Spectral model in the cutoff power-law: ------------------------------------------------------------ Parameters : value lower 90% higher 90% Photon index: -1.07922 ( -1.62878 1.52381 ) Epeak [keV] : 178.730 ( -178.736 -178.736 ) Norm@50keV : 7.91940E-03 ( -0.00318135 0.0332519 ) ------------------------------------------------------------ #Fit statistic : Chi-Squared 53.62 using 59 bins. Reduced chi-squared = 0.9575 # Null hypothesis probability of 5.66e-01 with 56 degrees of freedom Photon flux (15-150 keV) in 1 sec: 0.696168 ( -0.141238 0.140436 ) ph/cm2/s Energy fluence (15-150 keV) : 5.6119e-08 ( -1.32691e-08 1.32427e-08 ) ergs/cm2
Time-resolved spectra
Distribution
T90 vs. Hardness ratio plot
T90 = N/A sec. Hardness ratio (energy fluence ratio) = N/A
S(15-50 keV) vs. S(50-150 keV) plot
S(15-50 keV) = N/A S(50-150 keV) = N/A
The dash-dotted line and the dashed line traces the fluences calculated from the Band function with Epeak = 15 and 150 keV, respectively. Both lines assume a canonical values of alpha = -1 and beta = -2.5.
Mask shadow pattern
IMX = 8.543604536943343E-02, IMY = -1.889426024036979E-01
Spacecraft aspect plot
Bright source in the pre-burst/pre-slew/post-slew images
Pre-burst image of 15-350 keV band
Time interval of the image: -239.432000 -74.036000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 117.2377 -8.7938 2.8 49.6 25.5 3.4472 4.1 ------ UNKNOWN
Pre-slew background subtracted image of 15-350 keV band
Time interval of the image: -74.036000 46.368000 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 356.1776 -78.6088 2.3 44.5 166.4 1.2992 5.0 ------ UNKNOWN 94.5506 -44.9724 2.0 11.7 65.7 0.8691 5.8 ------ UNKNOWN 330.4099 -69.0378 1.7 54.2 175.1 3.7146 7.0 ------ UNKNOWN 83.5548 -24.5412 2.4 21.0 -15.5 0.7280 4.9 ------ UNKNOWN
Post-slew image of 15-350 keV band
Time interval of the image: 92.668600 962.697600 # RAcent DECcent POSerr Theta Phi PeakCts SNR AngSep Name # [deg] [deg] ['] [deg] [deg] ['] 135.4105 -40.5133 6.8 30.0 71.9 3.6318 1.7 5.9 Vela X-1 134.3064 -39.3663 2.7 29.7 69.1 8.4790 4.3 ------ UNKNOWN 90.0900 -12.1545 2.2 33.1 -32.2 6.3907 5.1 ------ UNKNOWN