Gamma-ray Burst 110412A

(All information courtesy of the instrument teams.)

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 12 Apr 11 07:33:52 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     324286417
GRB_RA:          110.483d {+07h 21m 56s} (J2000),
                 110.651d {+07h 22m 36s} (current),
                 109.741d {+07h 18m 58s} (1950)
GRB_DEC:         +21.267d {+21d 15' 60"} (J2000),
                 +21.245d {+21d 14' 40"} (current),
                 +21.362d {+21d 21' 44"} (1950)
GRB_ERROR:       28.38 [deg radius, statistical plus systematic]
GRB_INTEN:       53 [cnts/sec]
DATA_SIGNIF:     7.10 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15663 TJD;   102 DOY;   11/04/12
GRB_TIME:        27215.71 SOD {07:33:35.71} UT
GRB_PHI:         170.00 [deg]
GRB_THETA:        30.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.51
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      80%  GRB
2nd_MOST_LIKELY:  12%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,1,0, 1,0,0, 0,0,
SUN_POSTN:        20.39d {+01h 21m 34s}   +8.59d {+08d 35' 22"}
SUN_DIST:         87.14 [deg]   Sun_angle= -6.0 [hr] (East of Sun)
MOON_POSTN:      123.79d {+08h 15m 11s}  +16.58d {+16d 34' 58"}
MOON_DIST:        13.27 [deg]
MOON_ILLUM:      59 [%]
GAL_COORDS:      196.84, 15.99 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      109.03, -0.83 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 113.42,-22.37 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 12 Apr 11 07:34:00 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     324286417
GRB_RA:          130.433d {+08h 41m 44s} (J2000),
                 130.590d {+08h 42m 22s} (current),
                 129.738d {+08h 38m 57s} (1950)
GRB_DEC:         +14.433d {+14d 25' 60"} (J2000),
                 +14.393d {+14d 23' 33"} (current),
                 +14.613d {+14d 36' 45"} (1950)
GRB_ERROR:       14.60 [deg radius, statistical plus systematic]
GRB_INTEN:       136 [cnts/sec]
DATA_SIGNIF:     11.00 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        15663 TJD;   102 DOY;   11/04/12
GRB_TIME:        27215.71 SOD {07:33:35.71} UT
GRB_PHI:         170.00 [deg]
GRB_THETA:        50.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.74
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      85%  GRB
2nd_MOST_LIKELY:  12%  Distant Particles
DETECTORS:       0,0,0, 0,0,0, 0,1,0, 1,0,0, 0,0,
SUN_POSTN:        20.39d {+01h 21m 34s}   +8.59d {+08d 35' 22"}
SUN_DIST:        107.07 [deg]   Sun_angle= -7.3 [hr] (East of Sun)
MOON_POSTN:      123.80d {+08h 15m 11s}  +16.58d {+16d 34' 56"}
MOON_DIST:         6.90 [deg]
MOON_ILLUM:      59 [%]
GAL_COORDS:      211.77, 30.84 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      129.01, -3.70 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 113.42,-22.37 [deg].

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 12 Apr 11 07:34:16 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     324286417     
GRB_RA:          117.400d {+07h 49m 36s} (J2000),
                 117.558d {+07h 50m 14s} (current),
                 116.701d {+07h 46m 48s} (1950)
GRB_DEC:         +13.230d {+13d 13' 48"} (J2000),
                 +13.201d {+13d 12' 04"} (current),
                 +13.357d {+13d 21' 24"} (1950)
GRB_ERROR:       11.32 [deg radius, statistical only]
DATA_SIGNIF:     12.10 [sigma] 
DATA_INTERVAL:   4.096 [sec]   
GRB_DATE:        15663 TJD;   102 DOY;   11/04/12 
GRB_TIME:        27215.71 SOD {07:33:35.71} UT
GRB_PHI:         161.00 [deg]  
GRB_THETA:        39.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        20.39d {+01h 21m 34s}   +8.59d {+08d 35' 22"}
SUN_DIST:         94.93 [deg]   Sun_angle= -6.5 [hr] (East of Sun)
MOON_POSTN:      123.80d {+08h 15m 12s}  +16.58d {+16d 34' 54"}
MOON_DIST:         6.91 [deg]
MOON_ILLUM:      59 [%] 
GAL_COORDS:      207.34, 18.78 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      116.88, -7.69 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.
COMMENTS:        In the LAT Field-of-view.
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Tue 12 Apr 11 07:34:21 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      68
TRIGGER_NUM:     324286417     
GRB_RA:          124.580d {+08h 18m 19s} (J2000),
                 124.737d {+08h 18m 57s} (current),
                 123.883d {+08h 15m 32s} (1950)
GRB_DEC:         +13.660d {+13d 39' 36"} (J2000),
                 +13.624d {+13d 37' 27"} (current),
                 +13.817d {+13d 48' 60"} (1950)
GRB_ERROR:       5.90 [deg radius, statistical only] 
DATA_SIGNIF:     12.30 [sigma] 
DATA_INTERVAL:   4.096 [sec]   
GRB_DATE:        15663 TJD;   102 DOY;   11/04/12 
GRB_TIME:        27215.71 SOD {07:33:35.71} UT
GRB_PHI:         166.00 [deg]  
GRB_THETA:        45.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:        20.39d {+01h 21m 34s}   +8.59d {+08d 35' 22"}
SUN_DIST:        101.71 [deg]   Sun_angle= -7.0 [hr] (East of Sun)
MOON_POSTN:      123.80d {+08h 15m 12s}  +16.58d {+16d 34' 53"}
MOON_DIST:         3.09 [deg]
MOON_ILLUM:      59 [%] 
GAL_COORDS:      210.00, 25.32 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      123.67, -5.83 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.
COMMENTS:        In the LAT Field-of-view.
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 Apr 11 07:34:55 UT
NOTICE_TYPE:     Swift-BAT GRB Position
TRIGGER_NUM:     451191,   Seg_Num: 0
GRB_RA:          133.492d {+08h 53m 58s} (J2000),
                 133.647d {+08h 54m 35s} (current),
                 132.802d {+08h 51m 13s} (1950)
GRB_DEC:         +13.517d {+13d 30' 60"} (J2000),
                 +13.473d {+13d 28' 24"} (current),
                 +13.707d {+13d 42' 25"} (1950)
GRB_ERROR:       3.00 [arcmin radius, statistical only]
GRB_INTEN:       0 [cnts]    Image_Peak=1355 [image_cnts]
TRIGGER_DUR:     80.000 [sec] 
TRIGGER_INDEX:   20000     E_range: 15-50 keV
BKG_INTEN:       0 [cnts]
BKG_TIME:        0.00 SOD {00:00:00.00} UT
BKG_DUR:         0 [sec]
GRB_DATE:        15663 TJD;   102 DOY;   11/04/12
GRB_TIME:        27201.15 SOD {07:33:21.15} UT
GRB_PHI:          74.63 [deg]
GRB_THETA:        35.55 [deg]
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.83 [sigma]
MERIT_PARAMS:     +1  +0  +0  +6  +1  -1  -5  +0 +34  +0 
SUN_POSTN:        20.39d {+01h 21m 34s}   +8.59d {+08d 35' 23"}
SUN_DIST:        110.17 [deg]   Sun_angle= -7.6 [hr] (East of Sun)
MOON_POSTN:      123.80d {+08h 15m 13s}  +16.58d {+16d 34' 47"}
MOON_DIST:        10.00 [deg]
MOON_ILLUM:      59 [%]
GAL_COORDS:      214.16, 33.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      132.12, -3.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Coordinates.  
COMMENTS:        This is an image trigger.  (The RATE_SIGNIF & BKG_{INTEN, TIME, DUR} are undefined.)  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 122.36,18.04 [deg].

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/SWIFT NOTICE
NOTICE_DATE:     Tue 12 Apr 11 07:37:36 UT
NOTICE_TYPE:     Swift-BAT GRB Lightcurve
TRIGGER_NUM:     451191,   Seg_Num: 0
GRB_RA:          133.492d {+08h 53m 58s} (J2000),
                 133.647d {+08h 54m 35s} (current),
                 132.802d {+08h 51m 13s} (1950)
GRB_DEC:         +13.517d {+13d 30' 60"} (J2000),
                 +13.473d {+13d 28' 24"} (current),
                 +13.707d {+13d 42' 25"} (1950)
GRB_DATE:        15663 TJD;   102 DOY;   11/04/12
GRB_TIME:        27201.15 SOD {07:33:21.15} UT
TRIGGER_INDEX:   20000
GRB_PHI:          74.63 [deg]
GRB_THETA:        35.55 [deg]
DELTA_TIME:      0.00 [sec]
TRIGGER_DUR:     80.000 [sec] 
SOLN_STATUS:     0x13
RATE_SIGNIF:     0.00 [sigma]
IMAGE_SIGNIF:    8.83 [sigma]
LC_URL:          sw00451191000msb.lc
SUN_POSTN:        20.39d {+01h 21m 35s}   +8.59d {+08d 35' 25"}
SUN_DIST:        110.17 [deg]   Sun_angle= -7.6 [hr] (East of Sun)
MOON_POSTN:      123.83d {+08h 15m 19s}  +16.57d {+16d 34' 20"}
MOON_DIST:         9.97 [deg]
MOON_ILLUM:      59 [%]
GAL_COORDS:      214.16, 33.20 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      132.12, -3.79 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        SWIFT-BAT GRB Lightcurve.  
COMMENTS:           
COMMENTS:        The next comments were copied from the BAT_POS Notice:  
COMMENTS:        This is an image trigger.  
COMMENTS:        A point_source was found.  
COMMENTS:        This does not match any source in the on-board catalog.  
COMMENTS:        This does not match any source in the ground catalog.  
COMMENTS:        This is a GRB.  
COMMENTS:        This trigger occurred at longitude,latitude = 122.36,18.04 [deg].

GCN Circular #11922
J. M. Gelbord (PSU), V. D'Elia (ASDC), P. A. Evans (U Leicester), N. Gehrels (NASA/GSFC), V. Mangano (INAF-IASFPA), C. B. Markwardt (NASA/GSFC), J. P. Osborne (U Leicester), C. Pagani (U Leicester), K. L. Page (U Leicester), M. H. Siegel (PSU) and M. Stamatikos (OSU/NASA/GSFC) report on behalf of the Swift Team:
At 07:33:21 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 110412A (trigger=451191). Swift did not slew to the location because the position is in an observing constraint. The BAT on-board calculated location is RA, Dec 133.492, +13.517 which is
```
   RA(J2000) = 08h 53m 58s
   Dec(J2000) = +13d 30' 60"
```
with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a single-peaked structure with a duration of about 30 sec. The peak count rate was ~600 counts/sec (15-350 keV), at ~20 sec after the trigger.
Due to a Moon observing constraint, Swift cannot slew to the BAT position until 15:08 UT on 2011 April 14. There will thus be no XRT or UVOT data for this trigger before this time.
Burst Advocate for this burst is J. M. Gelbord (jgelbord AT astro.psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/too.html.)
GCN Circular #11926
Arne Rau (MPE) reports on behalf of the Fermi GBM Team:
"At 07:33:35.71 UT on 12 April 2011, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 110412A (trigger 07:33:35.71 / 110412315) which was also detected by the Swift/BAT (Gelbord et al. 2011, GCN 11922). The GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 53 degrees.
The GBM light curve shows a single peak with a duration (T90) of about 16 s (50-300 keV). The time-averaged spectrum from T0-1.5 s to T0+18.9 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.7 +/- 0.1 and the cutoff energy, parameterized as Epeak, is 87 +/- 5 keV
The event fluence (10-1000 keV) in this time interval is (2.2 +/- 0.1)E-06 erg/cm^2. The 1.024-sec peak photon flux measured starting from T0+5.8 s in the 10-1000 keV band is 2.7 +/- 0.2 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11929
W. H. Baumgartner (GSFC/UMBC), S. D. Barthelmy (GSFC), J. R. Cummings (GSFC/UMBC), N. Gehrels (GSFC), J. M. Gelbord (PSU), H. A. Krimm (GSFC/USRA), C. B. Markwardt (GSFC), D. M. Palmer (LANL), T. Sakamoto (GSFC/UMBC), M. Stamatikos (OSU), J. Tueller (GSFC), T. N. Ukwatta (MSU) (i.e. the Swift-BAT team):
Using the data set from T-60 to T+243 sec from recent telemetry downlinks, we report further analysis of BAT GRB 110412A (trigger #451191) (Gelbord, et al., GCN Circ. 11922). The BAT ground-calculated position is RA, Dec = 133.491, 13.488 deg, which is
```
   RA(J2000)  =  08h 53m 57.9s 
   Dec(J2000) = +13d 29' 15.4" 
```
with an uncertainty of 1.9 arcmin, (radius, sys+stat, 90% containment). The partial coding was 18%.
The mask-weighted light curve shows a FRED-like pulse starting at ~T+10 sec, peaking at ~T+20 sec, and ending at ~T+45 sec. T90 (15-350 keV) is 23.4 +- 4.1 sec (estimated error including systematics).
The time-averaged spectrum from T+13.7 to T+40.4 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.54 +- 0.14. The fluence in the 15-150 keV band is 1.8 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+18.96 sec in the 15-150 keV band is 2.0 +- 0.4 ph/cm2/sec. All the quoted errors are at the 90% confidence level.
The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/451191/BA/

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Jochen Greiner, last update: 12-Apr-2011 [Disclaimer]