Gamma-ray Burst 240317B

(All information courtesy of the instrument teams.)

Previous IAU Circulars

none

Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 17 Mar 24 10:54:55 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      45
TRIGGER_NUM:     732365669
GRB_RA:          267.917d {+17h 51m 40s} (J2000),
                 268.154d {+17h 52m 37s} (current),
                 267.426d {+17h 49m 42s} (1950)
GRB_DEC:         +28.300d {+28d 18' 00"} (J2000),
                 +28.295d {+28d 17' 43"} (current),
                 +28.311d {+28d 18' 41"} (1950)
GRB_ERROR:       23.62 [deg radius, statistical plus systematic]
GRB_INTEN:       63 [cnts/sec]
DATA_SIGNIF:     5.20 [sigma]
INTEG_TIME:      4.096 [sec]
GRB_DATE:        20386 TJD;    77 DOY;   24/03/17
GRB_TIME:        39264.02 SOD {10:54:24.02} UT
GRB_PHI:          77.00 [deg]
GRB_THETA:        80.00 [deg]
DATA_TIME_SCALE: 4.0960 [sec]
HARD_RATIO:      0.74
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      79%  GRB
2nd_MOST_LIKELY:  13%  Distant Particles
DETECTORS:       0,0,1, 0,1,0, 0,0,0, 0,1,0, 0,0,
SUN_POSTN:       357.56d {+23h 50m 15s}   -1.06d {-01d 03' 20"}
SUN_DIST:         89.98 [deg]   Sun_angle= 6.0 [hr] (West of Sun)
MOON_POSTN:       90.79d {+06h 03m 09s}  +28.53d {+28d 31' 49"}
MOON_DIST:       123.12 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       53.45, 24.72 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      267.04, 51.72 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240317454/quicklook/glg_lc_medres34_bn240317454.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 224.02,25.58 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Sun 17 Mar 24 10:55:13 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      57
TRIGGER_NUM:     732365669
GRB_RA:          276.840d {+18h 27m 22s} (J2000),
                 277.042d {+18h 28m 10s} (current),
                 276.423d {+18h 25m 42s} (1950)
GRB_DEC:         +39.000d {+39d 00' 00"} (J2000),
                 +39.016d {+39d 00' 59"} (current),
                 +38.968d {+38d 58' 04"} (1950)
GRB_ERROR:       10.70 [deg radius, statistical only]
DATA_SIGNIF:     7.20 [sigma]
DATA_INTERVAL:   4.096 [sec]
GRB_DATE:        20386 TJD;    77 DOY;   24/03/17
GRB_TIME:        39264.02 SOD {10:54:24.02} UT
GRB_PHI:          82.00 [deg]
GRB_THETA:        92.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:       357.56d {+23h 50m 15s}   -1.06d {-01d 03' 20"}
SUN_DIST:         83.32 [deg]   Sun_angle= 5.4 [hr] (West of Sun)
MOON_POSTN:       90.79d {+06h 03m 09s}  +28.53d {+28d 31' 49"}
MOON_DIST:       112.20 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       67.01, 21.07 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      281.43, 62.17 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240317454/quicklook/glg_lc_medres34_bn240317454.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_732365669.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:     Sun 17 Mar 24 11:03:51 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     732365669
GRB_RA:          274.530d {+18h 18m 07s} (J2000),
                 274.683d {+18h 18m 44s} (current),
                 274.215d {+18h 16m 52s} (1950)
GRB_DEC:         +49.560d {+49d 33' 36"} (J2000),
                 +49.571d {+49d 34' 15"} (current),
                 +49.539d {+49d 32' 20"} (1950)
GRB_ERROR:       8.80 [deg radius, statistical only]
GRB_DATE:        20386 TJD;    77 DOY;   24/03/17
GRB_TIME:        39264.02 SOD {10:54:24.02} UT
GRB_PHI:          92.00 [deg]
GRB_THETA:        96.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:       357.57d {+23h 50m 16s}   -1.05d {-01d 03' 11"}
SUN_DIST:         86.20 [deg]   Sun_angle= 5.5 [hr] (West of Sun)
MOON_POSTN:       90.88d {+06h 03m 30s}  +28.53d {+28d 31' 54"}
MOON_DIST:       101.82 [deg]
MOON_ILLUM:      53 [%]
GAL_COORDS:       77.60, 25.51 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      280.00, 72.84 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240317454/quicklook/glg_lc_medres34_bn240317454.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240317454/quicklook/glg_locplot_all_bn240317454.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.

GCN Circular #35941
The Fermi GBM team reports the detection of a likely LONG GRB
At 10:54:24 UT on 17 Mar 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240317B (trigger 732365669.017448 / 240317454).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 274.5, Dec = 49.6 (J2000 degrees, equivalent to J2000 18h 18m, 49d 36'), with a statistical uncertainty of 8.8 degrees.
The angle from the Fermi LAT boresight is 96.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240317454/quicklook/glg_skymap_all_bn240317454.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/bn240317454/quicklook/glg_healpix_all_bn240317454.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240317454/quicklook/glg_lc_medres34_bn240317454.gif

GCN Circular #35943
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-Amur robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Blagoveshchensk State Pedagogical University) started inspect of the Fermi GRB 240317B ( Fermi GBM team, GCN 35941) errorbox 465 sec after notice time and 497 sec after trigger time at 2024-03-17 11:02:41 UT, with upper limit up to 17.7 mag. Observations started at twilight. The observations began at zenith distance = 69 deg. The sun altitude is -14.2 deg.
MASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) started inspect of the Fermi GRB 240317B errorbox 5026 sec after notice time and 5058 sec after trigger time at 2024-03-17 12:18:42 UT, with upper limit up to 14.5 mag. Observations started at twilight. The observations began at zenith distance = 78 deg. The sun altitude is -10.9 deg.
The galactic latitude b = 25 deg., longitude l = 78 deg.
Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2400679
We obtain a following upper limits.

Tmid-T0  |      Date Time      |          Site       |             Coord (J2000)          |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________

     527 | 2024-03-17 11:02:41 |         MASTER-Amur | (18h 08m 33.84s , +60d 12m 29.5s) |   C |    60 | 17.0 |        
     607 | 2024-03-17 11:04:01 |         MASTER-Amur | (18h 24m 41.82s , +60d 10m 12.2s) |   C |    60 | 17.1 |        
    5088 | 2024-03-17 12:18:42 |        MASTER-Tunka | (18h 40m 58.76s , +51d 03m 11.4s) |   C |    60 | 13.3 |        
    5247 | 2024-03-17 12:21:20 |        MASTER-Tunka | (18h 38m 56.08s , +52d 56m 32.7s) |   C |    60 | 13.1 |        
    5326 | 2024-03-17 12:22:39 |        MASTER-Tunka | (18h 11m 57.74s , +54d 49m 55.0s) |   C |    60 | 13.6 |        
    5405 | 2024-03-17 12:23:59 |        MASTER-Tunka | (18h 25m 29.46s , +54d 49m 03.5s) |   C |    60 | 13.1 |        
    5484 | 2024-03-17 12:25:18 |        MASTER-Tunka | (18h 44m 12.61s , +49d 08m 38.9s) |   C |    60 | 12.8 |        
    5723 | 2024-03-17 12:29:16 |        MASTER-Tunka | (18h 10m 46.74s , +56d 42m 59.1s) |   C |    60 | 13.9 |        
    5809 | 2024-03-17 12:30:42 |        MASTER-Tunka | (18h 25m 14.42s , +56d 44m 15.4s) |   C |    60 | 13.9 |        
    5888 | 2024-03-17 12:32:02 |        MASTER-Tunka | (18h 37m 57.53s , +54d 50m 37.3s) |   C |    60 | 13.9 |        
    5967 | 2024-03-17 12:33:21 |        MASTER-Tunka | (18h 51m 38.66s , +54d 48m 51.4s) |   C |    60 | 13.8 |        
    6093 | 2024-03-17 12:35:27 |        MASTER-Tunka | (17h 32m 14.76s , +47d 49m 22.3s) |   C |    60 | 12.0 |        
    6173 | 2024-03-17 12:36:46 |        MASTER-Tunka | (17h 45m 53.62s , +51d 38m 34.6s) |   C |    60 | 13.6 |        
    6252 | 2024-03-17 12:38:05 |        MASTER-Tunka | (17h 58m 51.51s , +51d 37m 38.5s) |   C |    60 | 13.5 |        
    6331 | 2024-03-17 12:39:25 |        MASTER-Tunka | (18h 08m 20.83s , +53d 30m 31.9s) |   C |    60 | 13.5 |        
    6411 | 2024-03-17 12:40:44 |        MASTER-Tunka | (18h 22m 07.75s , +53d 30m 45.1s) |   C |    60 | 13.3 |        
    6490 | 2024-03-17 12:42:03 |        MASTER-Tunka | (17h 42m 29.98s , +53d 33m 01.3s) |   C |    60 | 13.7 |        
    6569 | 2024-03-17 12:43:22 |        MASTER-Tunka | (17h 56m 03.03s , +53d 31m 31.5s) |   C |    60 | 14.2 |        
    6648 | 2024-03-17 12:44:42 |        MASTER-Tunka | (18h 07m 12.93s , +55d 25m 21.8s) |   C |    60 | 13.5 |        
    6727 | 2024-03-17 12:46:01 |        MASTER-Tunka | (18h 21m 30.03s , +55d 25m 53.4s) |   C |    60 | 13.9 |        
    6807 | 2024-03-17 12:47:20 |        MASTER-Tunka | (18h 10m 40.47s , +51d 38m 42.8s) |   C |    60 | 12.5 |        
    6886 | 2024-03-17 12:48:40 |        MASTER-Tunka | (18h 34m 27.86s , +53d 30m 56.9s) |   C |    60 | 13.1 |        
    7045 | 2024-03-17 12:51:19 |        MASTER-Tunka | (18h 23m 52.08s , +51d 35m 59.6s) |   C |    60 | 12.9 |        
    7125 | 2024-03-17 12:52:38 |        MASTER-Tunka | (17h 45m 52.05s , +51d 36m 29.1s) |   C |    60 | 13.2 |        
    7283 | 2024-03-17 12:55:16 |        MASTER-Tunka | (18h 08m 31.13s , +53d 32m 30.1s) |   C |    60 | 12.0 |        
    7362 | 2024-03-17 12:56:36 |        MASTER-Tunka | (18h 22m 06.54s , +53d 30m 53.0s) |   C |    60 | 12.2 |        
    7442 | 2024-03-17 12:57:55 |        MASTER-Tunka | (17h 42m 28.24s , +53d 30m 30.9s) |   C |    60 | 13.5 |        
    7521 | 2024-03-17 12:59:15 |        MASTER-Tunka | (17h 56m 14.41s , +53d 31m 12.9s) |   C |    60 | 12.3 |        
    7600 | 2024-03-17 13:00:34 |        MASTER-Tunka | (18h 07m 15.33s , +55d 25m 54.0s) |   C |    60 | 13.1 |        
    7680 | 2024-03-17 13:01:53 |        MASTER-Tunka | (18h 21m 35.22s , +55d 24m 10.8s) |   C |    60 | 13.4 |        
    7838 | 2024-03-17 13:04:32 |        MASTER-Tunka | (18h 34m 26.84s , +53d 30m 37.4s) |   C |    60 | 12.8 |        
    7997 | 2024-03-17 13:07:11 |        MASTER-Tunka | (18h 01m 01.79s , +45d 53m 48.3s) |   C |    60 | 13.1 |        
    8116 | 2024-03-17 13:09:09 |         MASTER-Amur | (18h 08m 32.38s , +60d 15m 05.1s) |   C |    60 | 17.6 |        
    8168 | 2024-03-17 13:10:01 |        MASTER-Tunka | (17h 38m 59.01s , +45d 54m 53.6s) |   C |    60 | 12.7 |        
    8195 | 2024-03-17 13:10:29 |         MASTER-Amur | (18h 24m 43.45s , +60d 15m 58.2s) |   C |    60 | 17.7 |        
    8334 | 2024-03-17 13:12:48 |        MASTER-Tunka | (17h 26m 26.99s , +49d 44m 57.1s) |   C |    60 | 13.3 |        
    8414 | 2024-03-17 13:14:07 |        MASTER-Tunka | (17h 39m 06.53s , +49d 43m 35.7s) |   C |    60 | 13.6 |        
    8493 | 2024-03-17 13:15:26 |        MASTER-Tunka | (18h 23m 15.91s , +45d 53m 39.0s) |   C |    60 | 13.4 |        
    8572 | 2024-03-17 13:16:46 |        MASTER-Tunka | (17h 40m 10.09s , +55d 26m 08.0s) |   C |    60 | 13.2 |        
    8651 | 2024-03-17 13:18:05 |        MASTER-Tunka | (17h 54m 24.83s , +55d 25m 12.8s) |   C |    60 | 13.1 |        
    8730 | 2024-03-17 13:19:24 |        MASTER-Tunka | (17h 46m 22.65s , +44d 01m 00.9s) |   C |    60 | 14.5 |        
    8889 | 2024-03-17 13:22:03 |        MASTER-Tunka | (17h 21m 14.66s , +51d 37m 48.6s) |   C |    60 | 14.5 |        
    8968 | 2024-03-17 13:23:22 |        MASTER-Tunka | (17h 34m 22.92s , +51d 38m 11.6s) |   C |    60 | 13.6 |

Filter C is a clear (unfiltred) band.
The observation and reduction will continue. The message may be cited.

GCN Circular #35948
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
Swift/BAT did not localize GRB 240317B onboard (T0: 2024-03-17T10:54:24.00 UTC, Fermi/GBM trigger 732365669).
The Fermi notice, distributed in near real-time, triggered the Swift Mission Operations Center operated Gamma-ray Urgent Archiver for Novel Opportunities (GUANO; Tohuvavohu et al. 2020, ApJ, 900, 1).=20
Upon trigger by this notice, GUANO sent a command to the Swift Burst Alert Telescope (BAT) to save 200 seconds of BAT event-mode data from [-50,+150] seconds around the time of the burst. All the requested event mode data was delivered to the ground.
The BAT likelihood search, NITRATES (DeLaunay + Tohuvavohu 2022, ApJ, 941, 169), detects the burst in a 16.384 s analysis time bin with a sqrt(TS) of 49.27. An arcminute localization is found with DeltaLLHOut of 385 and a DeltaLLHPeak of 501.
See Section 9.1 and Figures 10 and 17 in the NITRATES paper for brief descriptions and interpretations of sqrt(TS), DeltaLLHPeak, and DeltaLLHOut.
The BAT position is RA, Dec =3D 272.18, +39.182 deg which is
```
   RA(J2000)  = 18h 08m 43.2s
   Dec(J2000) = +39d 10 55.2
```
with an estimated uncertainty of 15 arcmin radius, due to star tracker loss-of-lock.
Follow-up observations from other instruments are requested. XRT and UVOT will not follow-up until March 18 due to planned observatory downtime.
GUANO is a fully autonomous, extremely low latency, spacecraft commanding pipeline designed for targeted recovery of BAT event mode data around the times of compelling astrophysical events to enable more sensitive GRB searches.
A live reporting of Swift/BAT event data recovered by GUANO can be found at: https://www.swift.psu.edu/guano/
GCN Circular #35955
R. Hamburg (CNRS/IN2P3/IJCLab) and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team:
"At 10:54:24.02 UT on 17 March 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240317B (trigger 732365669/240317454), which was also detected by Swift/BAT-GUANO (DeLaunay et al. 2024, GCN 35948). The Fermi GBM on-ground location is consistent with the Swift position.
The angle from the Fermi LAT boresight is 89 degrees.
The GBM light curve shows one main emission episode with a duration (T90) of about 35 s (50-300 keV). The time-averaged spectrum from T0-6.1 to T0+32.8 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.6 +/- 0.3 and the cutoff energy, parameterized as Epeak, is 76 +/- 9 keV.
The event fluence (10-1000 keV) in this time interval is (1.9 +/- 0.2)E-06 erg/cm^2. The 1-sec peak photon flux measured starting from T0+3.0 s in the 10-1000 keV band is 2.3 +/- 0.4 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 #35965
James DeLaunay (PSU), Aaron Tohuvavohu (U Toronto), Samuele Ronchini (PSU), Gayathri Raman (PSU), Jamie A. Kennea (PSU), Tyler Parsotan (NASA GSFC) report:
During the detection of GRB 240317B, Swift was in safe point mode and had an unstable pointing. Due to this, the angular error is larger than previously reported (GCN 35948). We have performed an imaging analysis at the time of the GRB and found Cyg X-1 at an angular offset of ~1 deg. We also attempt to approximately correct the best fit position.=20
The updated BAT position and error is, RA, Dec =3D 271.95, +38.4 deg which is
```
   RA(J2000)  = 18h 07m 48.0s
   Dec(J2000) = +38d 24=E2=80=B2 00.0=E2=80=B3
```
with an estimated uncertainty of ~1 deg radius

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