Gamma-ray Burst 100915B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN/BACODINE POSITION NOTICE


TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 15 Sep 10 05:49:53 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    6061,   Sub_Num: 0
GRB_RA:          85.3795d {+05h 41m 31s} (J2000),
                 85.5444d {+05h 42m 11s} (current),
                 84.6092d {+05h 38m 26s} (1950)
GRB_DEC:        +25.0753d {+25d 04' 31"} (J2000),
                +25.0800d {+25d 04' 48"} (current),
                +25.0510d {+25d 03' 04"} (1950)
GRB_ERROR:      2.97 [arcmin, radius, statistical only]
GRB_INTEN:      10.77 [sigma]
GRB_TIME:       20979.66 SOD {05:49:39.66} UT
GRB_DATE:       15454 TJD;   258 DOY;   10/09/15
SC_RA:           83.78 [deg] (J2000)
SC_DEC:          19.76 [deg] (J2000)
SUN_POSTN:      172.92d {+11h 31m 40s}   +3.06d {+03d 03' 32"}
SUN_DIST:        86.33 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:     261.73d {+17h 26m 55s}  -24.76d {-24d 45' 33"}
MOON_DIST:      176.52 [deg]
GAL_COORDS:     182.81, -2.80 [deg] galactic lon,lat of the burst
ECL_COORDS:      85.81,  1.70 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(0.0<100sec) coincident with the FERMI_GBM event (trignum=306222581).  
COMMENTS:       Possibly real GRB event

red DSS finding chart ps-file

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 15 Sep 10 05:49:57 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      48
TRIGGER_NUM:     306222581
GRB_RA:           84.700d {+05h 38m 48s} (J2000),
                  84.862d {+05h 39m 27s} (current),
                  83.943d {+05h 35m 46s} (1950)
GRB_DEC:         +22.900d {+22d 53' 60"} (J2000),
                 +22.905d {+22d 54' 20"} (current),
                 +22.872d {+22d 52' 21"} (1950)
GRB_ERROR:       25.43 [deg radius, statistical plus systematic]
GRB_INTEN:       99 [cnts/sec]
DATA_SIGNIF:     4.80 [sigma]
INTEG_TIME:      2.048 [sec]
GRB_DATE:        15454 TJD;   258 DOY;   10/09/15
GRB_TIME:        20979.62 SOD {05:49:39.62} UT
GRB_PHI:          43.00 [deg]
GRB_THETA:       125.00 [deg]
DATA_TIME_SCALE: 2.0480 [sec]
HARD_RATIO:      0.57
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      88%  GRB
2nd_MOST_LIKELY:   7%  GRO_J0422_32
DETECTORS:       0,0,1, 0,0,1, 0,0,0, 0,0,0, 0,0,
SUN_POSTN:       172.92d {+11h 31m 40s}   +3.06d {+03d 03' 32"}
SUN_DIST:         87.02 [deg]   Sun_angle= 5.9 [hr] (West of Sun)
MOON_POSTN:      261.73d {+17h 26m 55s}  -24.76d {-24d 45' 33"}
MOON_DIST:       176.59 [deg]
MOON_ILLUM:      50 [%]
GAL_COORDS:      184.33, -4.48 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:       85.12, -0.45 [deg] ecliptic lon,lat of the burst (or transient)
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 98.55,10.25 [deg].

GCN NOTICE

 
TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Wed 15 Sep 10 05:50:18 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     306222581     
GRB_RA:           86.690d {+05h 46m 46s} (J2000),
                  86.847d {+05h 47m 23s} (current),
                  85.959d {+05h 43m 50s} (1950) 
GRB_DEC:         +18.030d {+18d 01' 48"} (J2000), 
                 +18.033d {+18d 02' 00"} (current), 
                 +18.012d {+18d 00' 44"} (1950)
GRB_ERROR:       16.08 [deg radius, statistical only]     
DATA_SIGNIF:     6.10 [sigma]  
DATA_INTERVAL:   2.048 [sec]   
GRB_DATE:        15454 TJD;   258 DOY;   10/09/15
GRB_TIME:        20979.62 SOD {05:49:39.62} UT
GRB_PHI:          47.00 [deg]
GRB_THETA:       121.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   413 (Gnd S/W Version number)
SUN_POSTN:       172.92d {+11h 31m 40s}   +3.06d {+03d 03' 32"}
SUN_DIST:         85.32 [deg]   Sun_angle= 5.7 [hr] (West of Sun)
MOON_POSTN:      261.73d {+17h 26m 56s}  -24.76d {-24d 45' 33"}
MOON_DIST:       171.76 [deg]
MOON_ILLUM:      50 [%]        
GAL_COORDS:      189.48, -5.42 [deg] galactic lon,lat of the burst (or transient)       
ECL_COORDS:       86.84, -5.37 [deg] ecliptic lon,lat of the burst (or transient)      
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.
COMMENTS:        This Notice was ground-generated -- not flight-generated.

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 15 Sep 10 05:52:53 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    6061,   Sub_Num: 1
GRB_RA:          85.3873d {+05h 41m 33s} (J2000),
                 85.5523d {+05h 42m 13s} (current),
                 84.6170d {+05h 38m 28s} (1950)
GRB_DEC:        +25.0901d {+25d 05' 24"} (J2000),
                +25.0948d {+25d 05' 41"} (current),
                +25.0658d {+25d 03' 57"} (1950)
GRB_ERROR:      2.87 [arcmin, radius, statistical only]
GRB_INTEN:      12.31 [sigma]
GRB_TIME:       20985.62 SOD {05:49:45.62} UT
GRB_DATE:       15454 TJD;   258 DOY;   10/09/15
SC_RA:           83.78 [deg] (J2000)
SC_DEC:          19.76 [deg] (J2000)
SUN_POSTN:      172.92d {+11h 31m 41s}   +3.06d {+03d 03' 29"}
SUN_DIST:        86.32 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:     261.76d {+17h 27m 02s}  -24.76d {-24d 45' 30"}
MOON_DIST:      176.54 [deg]
GAL_COORDS:     182.80, -2.79 [deg] galactic lon,lat of the burst
ECL_COORDS:      85.82,  1.72 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(6.0<100sec) coincident with the FERMI_GBM event (trignum=306222581).  
COMMENTS:       Possibly real GRB event

GCN NOTICE

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Wed 15 Sep 10 06:54:41 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    6061,   Sub_Num: 2
GRB_RA:          85.3943d {+05h 41m 35s} (J2000),
                 85.5593d {+05h 42m 14s} (current),
                 84.6240d {+05h 38m 30s} (1950)
GRB_DEC:        +25.0947d {+25d 05' 41"} (J2000),
                +25.0994d {+25d 05' 58"} (current),
                +25.0705d {+25d 04' 14"} (1950)
GRB_ERROR:      2.00 [arcmin, radius, statistical only]
GRB_INTEN:      12.31 [sigma]
GRB_TIME:       20985.62 SOD {05:49:45.62} UT
GRB_DATE:       15454 TJD;   258 DOY;   10/09/15
SC_RA:           83.78 [deg] (J2000)
SC_DEC:          19.76 [deg] (J2000)
SUN_POSTN:      172.96d {+11h 31m 50s}   +3.04d {+03d 02' 30"}
SUN_DIST:        86.36 [deg]   Sun_angle= 5.8 [hr] (West of Sun)
MOON_POSTN:     262.36d {+17h 29m 27s}  -24.74d {-24d 44' 29"}
MOON_DIST:      177.08 [deg]
GAL_COORDS:     182.80, -2.78 [deg] galactic lon,lat of the burst
ECL_COORDS:      85.83,  1.72 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:           
COMMENTS:        NOTE: This INTEGRAL event is temporally(6.0<100sec) coincident with the FERMI_GBM event (trignum=306222581).  
COMMENTS:       refined_coordinates_after_offline_analysis

GCN Circular #11278
S.Mereghetti, A.Paizis (IASF- Milano), D.Gotz (CEA-Saclay), E. Bozzo, A.Taylor, M. Beck (ISDC, Versoix), and J. Borkowski (CAMK, Torun) on behalf of the IBAS Localization Team report:
a gamma ray burst lasting about 4 s has been detected by IBAS in the IBIS/ISGRI data at 05:49:39 U.T. on September 15th.
Its refined coordinates (J2000) are:
```
RA=  85.3944 (deg) 
DEC=+25.0949 (deg)
```
with an uncertainty of 2 arcmin (90% c.l.).
A preliminary analysis gives a 20-200 keV fluence of about 3e-7 erg/cm2 and a peak flux of about 1 ph/cm2 s (1 s integration time)
A plot of the light curve will be posted at
http://ibas.iasf-milano.inaf.it/IBAS_Results.html
This message can be cited.
GCN Circular #11284
Sheila McBreen (UCD/MPE) reports on behalf of the Fermi GBM Team:
"At 05:49:39.62 UT on 15 Sept 2010, the Fermi Gamma-Ray Burst Monitor triggered and located GRB 100915B (trigger 306222581 / 100915243) which was also detected by INTEGRAL/IBIS (Mereghetti et al. 2010, GCN 11278). The GBM on-ground location is consistent with the INTEGRAL position. The angle from the Fermi LAT boresight is 125 degrees.
The GBM light curve consists of one pulse with a duration (T90) of 7.8 (+/- 0.7) s (50-300 keV). The time-averaged spectrum from T0-5.6 s to T0+3.6 s is adequately fit by a power law function with an exponential high energy cutoff. The power law index is 1.35 (+1.63/- 1.10) and the cutoff energy, parameterized as Epeak, is 83.49 (+ 14.50/-9.81) keV (CSTAT 273 for 243 d.o.f.).
The event fluence (10-1000 keV) in this time interval is (4.82 +/- 0.06)E-07 erg/cm^2. The 1-sec peak photon flux measured starting from T0-2.56 s in the 10-1000 keV band is 1.85 +/- 0.19 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog."
GCN Circular #11286
T. Sakamoto (UMBC/GSFC), D. Donato (UMCP/GSFC), N. Gehrels (GSFC), T. Okajima (JHU/GSFC), Y. Urata (NCU), C.A. Wallace (FGCU)
We observed the field of GRB 100915B detected by INTEGRAL (trigger #6061; Mereghetti et al., GCN Circ. 11278) with the 14-inch Goddard Robotic Telescope (GRT) located at the Goddard Geophysical and Astronomical Observatory (http://cddisa.gsfc.nasa.gov/ggao/).
A total 226 images (excluding the bad quality images) of 5 sec (200 images) and 30 sec (26 images) exposures were taken in the R filter starting from September 15 05:50:55 (UT) about 76 seconds after the trigger (62 seconds after the initial INTEGRAL position notice) and stopped on September 15 06:37:44 (UT). The weather condition was relatively poor during the observation. We do not detect the optical afterglow both in the individual images and the stacked image inside the INTEGRAL position (Mereghetti et al., GCN #11278). The estimated five sigma upper limit of the combined image (total exposure of 1740 sec) is ~17.7 mag using the USNO-B1 catalog.

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Jochen Greiner, last update: 15-Sep-2010 [Disclaimer]