Gamma-ray Burst 240115B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN Notice

TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 15 Jan 24 16:46:14 UT
NOTICE_TYPE:    INTEGRAL Wakeup
TRIGGER_NUM:    10472,   Sub_Num: 0
GRB_RA:         191.8174d {+12h 47m 16s} (J2000),
                192.1453d {+12h 48m 35s} (current),
                191.1375d {+12h 44m 33s} (1950)
GRB_DEC:        -35.5582d {-35d 33' 28"} (J2000),
                -35.6891d {-35d 41' 20"} (current),
                -35.2853d {-35d 17' 06"} (1950)
GRB_ERROR:      3.18 [arcmin, radius, statistical only]
GRB_INTEN:      8.75 [sigma]
GRB_TIME:       60355.09 SOD {16:45:55.09} UT
GRB_DATE:       20324 TJD;    15 DOY;   24/01/15
SC_RA:          207.08 [deg] (J2000)
SC_DEC:         -38.87 [deg] (J2000)
SUN_POSTN:      296.96d {+19h 47m 52s}  -21.12d {-21d 07' 25"}
SUN_DIST:        89.06 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:     354.14d {+23h 36m 33s}   -5.17d {-05d 10' 05"}
MOON_DIST:      135.78 [deg]
GAL_COORDS:     301.98, 27.31 [deg] galactic lon,lat of the burst
ECL_COORDS:     205.76,-27.86 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.  
COMMENTS:       Time_Scale=50.0000 and Time_Error=50.0000.
COMMENTS:       Possibly real GRB event  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(18.0<100sec) coincident
+with the FERMI_GBM event (trignum=727029942).

GCN Notice

  
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 15 Jan 24 16:49:13 UT
NOTICE_TYPE:    INTEGRAL Refined
TRIGGER_NUM:    10472,   Sub_Num: 1
GRB_RA:         191.8481d {+12h 47m 24s} (J2000),
                192.1760d {+12h 48m 42s} (current),
                191.1681d {+12h 44m 40s} (1950)
GRB_DEC:        -35.5295d {-35d 31' 45"} (J2000),
                -35.6604d {-35d 39' 36"} (current),
                -35.2567d {-35d 15' 23"} (1950)
GRB_ERROR:      3.00 [arcmin, radius, statistical only]
GRB_INTEN:      10.44 [sigma]
GRB_TIME:       60365.09 SOD {16:46:05.09} UT
GRB_DATE:       20324 TJD;    15 DOY;   24/01/15
SC_RA:          207.08 [deg] (J2000)
SC_DEC:         -38.87 [deg] (J2000)
SUN_POSTN:      296.97d {+19h 47m 52s}  -21.12d {-21d 07' 24"}
SUN_DIST:        89.05 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:     354.16d {+23h 36m 39s}   -5.15d {-05d 09' 15"}
MOON_DIST:      135.82 [deg]
GAL_COORDS:     302.01, 27.33 [deg] galactic lon,lat of the burst
ECL_COORDS:     205.77,-27.82 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=25.0000 and Time_Error=25.0000.  
COMMENTS:       Possibly real GRB event  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(28.0<100sec) coincident
+with the FERMI_GBM event (trignum=727029942).

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 15 Jan 24 16:45:42 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     727029942
GRB_RA:          197.800d {+13h 11m 12s} (J2000),
                 198.145d {+13h 12m 35s} (current),
                 197.085d {+13h 08m 20s} (1950)
GRB_DEC:         -41.867d {-41d 52' 00"} (J2000),
                 -41.994d {-41d 59' 37"} (current),
                 -41.601d {-41d 36' 03"} (1950)
GRB_ERROR:       26.27 [deg radius, statistical plus systematic]
GRB_INTEN:       62 [cnts/sec]
DATA_SIGNIF:     5.40 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20324 TJD;    15 DOY;   24/01/15
GRB_TIME:        60337.62 SOD {16:45:37.62} UT
GRB_PHI:         278.00 [deg]
GRB_THETA:       100.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      -0.13
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      97%  GRB
2nd_MOST_LIKELY:   1%  Generic SGR
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       296.96d {+19h 47m 51s}  -21.12d {-21d 07' 25"}
SUN_DIST:         82.25 [deg]   Sun_angle= 6.6 [hr] (West of Sun)
MOON_POSTN:      354.13d {+23h 36m 31s}   -5.17d {-05d 10' 15"}
MOON_DIST:       128.01 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:      306.87, 20.85 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      213.78,-31.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_lc_medres34_bn240115698.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 241.62,23.58 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 15 Jan 24 16:45:49 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      58
TRIGGER_NUM:     727029942
GRB_RA:          194.633d {+12h 58m 32s} (J2000),
                 194.960d {+12h 59m 50s} (current),
                 193.955d {+12h 55m 49s} (1950)
GRB_DEC:         -29.100d {-29d 06' 00"} (J2000),
                 -29.229d {-29d 13' 45"} (current),
                 -28.830d {-28d 49' 48"} (1950)
GRB_ERROR:       11.92 [deg radius, statistical plus systematic]
GRB_INTEN:       92 [cnts/sec]
DATA_SIGNIF:     8.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20324 TJD;    15 DOY;   24/01/15
GRB_TIME:        60337.62 SOD {16:45:37.62} UT
GRB_PHI:         270.00 [deg]
GRB_THETA:        90.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.54
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      84%  GRB
2nd_MOST_LIKELY:  12%  Distant Particles
DETECTORS:       0,0,0, 0,1,0, 0,0,1, 0,0,0, 0,0,
SUN_POSTN:       296.96d {+19h 47m 51s}  -21.12d {-21d 07' 25"}
SUN_DIST:         89.62 [deg]   Sun_angle= 6.8 [hr] (West of Sun)
MOON_POSTN:      354.13d {+23h 36m 32s}   -5.17d {-05d 10' 13"}
MOON_DIST:       140.20 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:      304.80, 33.75 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      205.10,-21.00 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_lc_medres34_bn240115698.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 241.62,23.58 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 15 Jan 24 16:45:56 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     727029942
GRB_RA:          193.100d {+12h 52m 24s} (J2000),
                 193.425d {+12h 53m 42s} (current),
                 192.425d {+12h 49m 42s} (1950)
GRB_DEC:         -29.540d {-29d 32' 23"} (J2000),
                 -29.670d {-29d 40' 12"} (current),
                 -29.268d {-29d 16' 06"} (1950)
GRB_ERROR:       6.40 [deg radius, statistical only]
DATA_SIGNIF:     8.30 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20324 TJD;    15 DOY;   24/01/15
GRB_TIME:        60337.62 SOD {16:45:37.62} UT
GRB_PHI:         269.00 [deg]
GRB_THETA:        91.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       296.96d {+19h 47m 52s}  -21.12d {-21d 07' 25"}
SUN_DIST:         90.65 [deg]   Sun_angle= 6.9 [hr] (West of Sun)
MOON_POSTN:      354.13d {+23h 36m 32s}   -5.17d {-05d 10' 11"}
MOON_DIST:       140.55 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:      303.18, 33.33 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      203.99,-21.96 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_lc_medres34_bn240115698.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_727029942.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file will not be created/available until ~15 min after the trigger.  
COMMENTS:        The POS_MAP_URL file will not be created/available until ~1.5 min after the notice.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Mon 15 Jan 24 16:54:57 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     727029942
GRB_RA:          188.300d {+12h 33m 12s} (J2000),
                 188.622d {+12h 34m 29s} (current),
                 187.633d {+12h 30m 32s} (1950)
GRB_DEC:         -34.790d {-34d 47' 23"} (J2000),
                 -34.922d {-34d 55' 20"} (current),
                 -34.514d {-34d 30' 50"} (1950)
GRB_ERROR:       4.70 [deg radius, statistical only]
GRB_DATE:        20324 TJD;    15 DOY;   24/01/15
GRB_TIME:        60337.62 SOD {16:45:37.62} UT
GRB_PHI:         268.00 [deg]
GRB_THETA:        98.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       296.97d {+19h 47m 53s}  -21.12d {-21d 07' 21"}
SUN_DIST:         91.98 [deg]   Sun_angle= 7.2 [hr] (West of Sun)
MOON_POSTN:      354.21d {+23h 36m 51s}   -5.13d {-05d 07' 38"}
MOON_DIST:       137.71 [deg]
MOON_ILLUM:      23 [%]
GAL_COORDS:      298.69, 27.93 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      202.45,-28.45 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_lc_medres34_bn240115698.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_locplot_all_bn240115698.png
COMMENTS:        Fermi-GBM Final Position.  
COMMENTS:        This Notice was ground-generated -- not flight-generated.  
COMMENTS:        The LC_URL file should be available by the time this FINAL notice is produced.  
COMMENTS:        This notice was generated completely by automated pipeline processing.  
COMMENTS:        This is likely a Long GRB.  
COMMENTS:           
COMMENTS:        NOTE: This GBM event is temporally(18.0<100sec) coincident with the INTEGRAL event (trignum=10472).

GCN Circular #35540
The Fermi GBM team reports the detection of a likely LONG GRB
At 16:45:37 UT on 15 Jan 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240115B (trigger 727029942.62324 / 240115698).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 188.3, Dec = -34.8 (J2000 degrees, equivalent to J2000 12h 33m, -34d 47'), with a statistical uncertainty of 4.7 degrees.
The angle from the Fermi LAT boresight is 98.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_skymap_all_bn240115698.png
The HEALPix FITS file, including the estimated localization systematic, can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_healpix_all_bn240115698.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240115698/quicklook/glg_lc_medres34_bn240115698.gif

GCN NOTICE

  
TITLE:          GCN/INTEGRAL NOTICE
NOTICE_DATE:    Mon 15 Jan 24 17:21:29 UT
NOTICE_TYPE:    INTEGRAL Offline
TRIGGER_NUM:    10472,   Sub_Num: 2
GRB_RA:         191.8481d {+12h 47m 24s} (J2000),
                192.1760d {+12h 48m 42s} (current),
                191.1681d {+12h 44m 40s} (1950)
GRB_DEC:        -35.5295d {-35d 31' 45"} (J2000),
                -35.6604d {-35d 39' 36"} (current),
                -35.2567d {-35d 15' 23"} (1950)
GRB_ERROR:      3.00 [arcmin, radius, statistical only]
GRB_INTEN:      10.44 [sigma]
GRB_TIME:       60365.09 SOD {16:46:05.09} UT
GRB_DATE:       20324 TJD;    15 DOY;   24/01/15
SC_RA:          207.08 [deg] (J2000)
SC_DEC:         -38.87 [deg] (J2000)
SUN_POSTN:      296.99d {+19h 47m 58s}  -21.12d {-21d 07' 09"}
SUN_DIST:        89.07 [deg]   Sun_angle= 7.0 [hr] (West of Sun)
MOON_POSTN:     354.45d {+23h 37m 48s}   -5.00d {-05d 00' 09"}
MOON_DIST:      136.07 [deg]
GAL_COORDS:     302.01, 27.33 [deg] galactic lon,lat of the burst
ECL_COORDS:     205.77,-27.82 [deg] ecliptic lon,lat of the burst
COMMENTS:       INTEGRAL GRB Coordinates.
COMMENTS:       Time_Scale=25.0000 and Time_Error=25.0000.  
COMMENTS:       event_confirmation_after_offline_analysis  
COMMENTS:          
COMMENTS:       NOTE: This INTEGRAL event is temporally(28.0<100sec) coincident
+with the FERMI_GBM event (trignum=727029942).

GCN Circular #35541
S.Mereghetti (INAF, IASF-Milano), D.Gotz (CEA, Saclay), C.Ferrigno, E.Bozzo, V.Savchenko (ISDC, Versoix), L.Ducci (IAAT, Germany and ISDC, Versoix) and J.Borkowski (CAMK, Torun) report:
a gamma ray burst lasting about 190 s has been detected by IBAS in the IBIS/ISGRI data at 16:43:30 UT of 2024 Jan 15. The burst was detected at a large off-axis angle (about 13 degrees) resulting in a low significance and large uncertainties. We note that the brightest part of the burst was also detected by the Fermi/GBM (GCN circ. 35540)
The refined coordinates (J2000) are:
```
R.A.= 191.894 deg
DEC.= -35.566 deg
```
with an uncertainty of 3.5 arcmin (90% c.l.).
The burst had a fluence of about 4e-6 erg/cmq in the 20-200 keV range.
A plot of the light curve will be posted at http://ibas.iasf-milano.inaf.it/IBAS_Results.html
GCN Circular #35542
V. Lipunov, V.Kornilov, E. Gorbovskoy, K. Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.Senik, D. Vlasenko, G.Antipov, D.Zimnukhov, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D. Cheryasov, Ya.Kechin, Yu.Tselik, A. Sosnovskij (Lomonosov Moscow State University, SAI, Physics Department),
R. Podesta, C.Lopez, F. Podesta, C.Francile (Observatorio Astronomico Felix Aguilar OAFA),
R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias),
D. Buckley (South African Astronomical Observatory),
O.A. Gress, N.M. Budnev, O.Ershova (Irkutsk State University, API),
L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.R.Corella, L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory),
A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory),
V. Yurkov, A. Gabovich (Blagoveschensk Educational State University)
MASTER-SAAO robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in South Africa (South African Astronomical Observatory) started inspect of the Fermi GRB 240115B ( Fermi GBM team, GCN 35540) errorbox 12811 sec after notice time and 12818 sec after trigger time at 2024-01-15 20:19:16 UT, with upper limit up to 16.3 mag. The observations began at zenith distance = 87 deg. The sun altitude is -26.0 deg.
The galactic latitude b = 28 deg., longitude l = 299 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2356581
We obtain a following upper limits.
```
Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

   12909 | 2024-01-15 20:19:16 |         MASTER-SAAO | (12h 43m 33.54s , -35d 23m 00.7s) |   C |   180 | 16.3 |        
```
Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.
GCN Circular #35549
R. Hamburg (CNRS/IN2P3), S. Bala (USRA), and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 16:45:37.62 UT on 15 January 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240115B (trigger 727029942/240115698). GRB 240115B was also localized by INTEGRAL (S. Mereghetti et al. 2024, GCN 35541).
The angle from the Fermi LAT boresight is 97 degrees.
The GBM light curve consists of multiple peaks of emission with a duration (T90) of about 163 s (50-300 keV). The time-averaged spectrum from T0-26.63 s to T0+47.11 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.73 +/- 0.11, and the cutoff energy parameterized as Epeak, is 125 +/- 10.
The event fluence (10-1000 keV) in this time interval is (5.13 +/- 0.26)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+17.6 s in the 10-1000 keV band is 2.6 +/- 0.3 ph/s/cm^2.
The spectral analysis results presented above are preliminary; final results will be published in the GBM GRB Catalog: https://heasarc.gsfc.nasa.gov/W3Browse/fermi/fermigbrst.html
For Fermi GBM data and info, please visit the official Fermi GBM Support Page: https://fermi.gsfc.nasa.gov/ssc/data/access/gbm/"
GCN Circular #35551
J. Joshi (IUCAA), G. Waratkar (IITB), A. Vibhute (IUCAA), V. Bhalerao (IITB), D. Bhattacharya (Ashoka University/IUCAA), A. R. Rao (IUCAA/TIFR), and S. Vadawale (PRL) report on behalf of the AstroSat CZTI collaboration:
Analysis of AstroSat CZTI data with the CIFT framework (Sharma et al., 2021, JApA, 42, 73) showed the detection of a long-duration GRB 240115B which was also detected by Fermi-GBM (Fermi GBM team, GCN Circ. 35540), and INTEGRAL (S.Mereghetti et al., GCN Circ. 35541).
The source was detected in the CZT detectors in the 20-200 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-01-15 16:45:40.50 UTC. The measured peak count rate associated with the burst is 80 (+42, -5) counts/s above the background in the combined data of three quadrants (out of four), with a total of 2052 (+489, -339) counts. The local mean background count rate was 280 (+1, -4) counts/s. Using cumulative rates, we measure a T90 of 47 (+7, -4) s.
The source was also detected in the CsI anticoincidence (Veto) detector in the 100-500 keV energy range. The light curve showed multiple peaks of emission with the strongest peak at 2024-01-15 16:46:04.75 UTC. The measured peak count rate associated with the burst is 127 (+72, -1) counts/s above the background in the combined data of three quadrants (out of four), with a total of 1941 (+685, -748) counts. The local mean background count rate was 1168 (+5, -5) counts/s. We measure a T90 of 36 (+6, -10) s from the cumulative Veto light curve.
CZTI is built by a TIFR-led consortium of institutes across India, including VSSC, URSC, IUCAA, SAC, and PRL. The Indian Space Research Organisation funded, managed, and facilitated the project.
CZTI GRB detections are reported regularly on the payload site at: http://astrosat.iucaa.in/czti/?q=grb

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Jochen Greiner, last update: 17-Jan-2024 [Disclaimer]