Gamma-ray Burst 240411A

(All information courtesy of the instrument teams.)

Previous IAU Circulars

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Results of Observations

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 11 Apr 24 01:45:28 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      47
TRIGGER_NUM:     734492703
GRB_RA:          264.817d {+17h 39m 16s} (J2000),
                 264.912d {+17h 39m 39s} (current),
                 264.621d {+17h 38m 29s} (1950)
GRB_DEC:         +58.083d {+58d 04' 60"} (J2000),
                 +58.071d {+58d 04' 16"} (current),
                 +58.109d {+58d 06' 32"} (1950)
GRB_ERROR:       14.58 [deg radius, statistical plus systematic]
GRB_INTEN:       928 [cnts/sec]
DATA_SIGNIF:     8.10 [sigma]
INTEG_TIME:      0.032 [sec]
GRB_DATE:        20411 TJD;   102 DOY;   24/04/11
GRB_TIME:        6298.48 SOD {01:44:58.48} UT
GRB_PHI:         238.00 [deg]
GRB_THETA:        45.00 [deg]
DATA_TIME_SCALE: 0.0320 [sec]
HARD_RATIO:      0.59
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      88%  GRB
2nd_MOST_LIKELY:   6%  Cyg X-1
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:        20.03d {+01h 20m 08s}   +8.45d {+08d 26' 47"}
SUN_DIST:         95.59 [deg]   Sun_angle= 7.7 [hr] (West of Sun)
MOON_POSTN:       50.25d {+03h 21m 00s}  +21.75d {+21d 45' 02"}
MOON_DIST:        95.14 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:       86.49, 32.19 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      251.82, 81.19 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240411073/quicklook/glg_lc_medres34_bn240411073.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 178.95,25.37 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 11 Apr 24 01:45:37 UT
NOTICE_TYPE:     Fermi-GBM Flight Position
RECORD_NUM:      60
TRIGGER_NUM:     734492703
GRB_RA:          273.583d {+18h 14m 20s} (J2000),
                 273.638d {+18h 14m 33s} (current),
                 273.471d {+18h 13m 53s} (1950)
GRB_DEC:         +62.250d {+62d 15' 00"} (J2000),
                 +62.259d {+62d 15' 31"} (current),
                 +62.233d {+62d 13' 58"} (1950)
GRB_ERROR:       7.40 [deg radius, statistical plus systematic]
GRB_INTEN:       1124 [cnts/sec]
DATA_SIGNIF:     23.70 [sigma]
INTEG_TIME:      0.128 [sec]
GRB_DATE:        20411 TJD;   102 DOY;   24/04/11
GRB_TIME:        6298.48 SOD {01:44:58.48} UT
GRB_PHI:         243.00 [deg]
GRB_THETA:        40.00 [deg]
DATA_TIME_SCALE: 0.1280 [sec]
HARD_RATIO:      0.22
LOC_ALGORITHM:   3 (version number of)
MOST_LIKELY:      87%  GRB
2nd_MOST_LIKELY:   9%  Cyg X-1
DETECTORS:       0,0,0, 0,0,0, 1,1,0, 0,0,0, 0,0,
SUN_POSTN:        20.03d {+01h 20m 08s}   +8.45d {+08d 26' 47"}
SUN_DIST:         90.00 [deg]   Sun_angle= 7.1 [hr] (West of Sun)
MOON_POSTN:       50.25d {+03h 21m 00s}  +21.75d {+21d 45' 04"}
MOON_DIST:        89.21 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:       91.55, 28.06 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      291.38, 85.42 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240411073/quicklook/glg_lc_medres34_bn240411073.gif
COMMENTS:        Fermi-GBM Flight-calculated Coordinates.  
COMMENTS:        This trigger occurred at longitude,latitude = 178.95,25.37 [deg].  
COMMENTS:        The LC_URL file will not be created until ~15 min after the trigger.

GCN NOTICE

TITLE:           GCN/FERMI NOTICE
NOTICE_DATE:     Thu 11 Apr 24 01:45:48 UT
NOTICE_TYPE:     Fermi-GBM Ground Position
RECORD_NUM:      59
TRIGGER_NUM:     734492703
GRB_RA:          247.570d {+16h 30m 17s} (J2000),
                 247.763d {+16h 31m 03s} (current),
                 247.173d {+16h 28m 41s} (1950)
GRB_DEC:         +43.370d {+43d 22' 12"} (J2000),
                 +43.319d {+43d 19' 07"} (current),
                 +43.477d {+43d 28' 38"} (1950)
GRB_ERROR:       5.20 [deg radius, statistical only]
DATA_SIGNIF:     25.80 [sigma]
DATA_INTERVAL:   0.128 [sec]
GRB_DATE:        20411 TJD;   102 DOY;   24/04/11
GRB_TIME:        6298.48 SOD {01:44:58.48} UT
GRB_PHI:         227.00 [deg]
GRB_THETA:        61.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   4173 (Gnd S/W Version number)
SUN_POSTN:        20.03d {+01h 20m 08s}   +8.45d {+08d 26' 47"}
SUN_DIST:        112.54 [deg]   Sun_angle= 8.8 [hr] (West of Sun)
MOON_POSTN:       50.25d {+03h 21m 00s}  +21.75d {+21d 45' 06"}
MOON_DIST:       112.97 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:       68.20, 43.38 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      231.07, 63.81 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240411073/quicklook/glg_lc_medres34_bn240411073.gif
POS_MAP_URL:     http://gcn.gsfc.nasa.gov/notices_f/gbm_gnd_loc_map_734492703.fits
COMMENTS:        Fermi-GBM Ground-calculated Coordinates.  
COMMENTS:        Bright hard burst in the GBM.  
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:     Thu 11 Apr 24 01:54:17 UT
NOTICE_TYPE:     Fermi-GBM Final Position
RECORD_NUM:      0
TRIGGER_NUM:     734492703
GRB_RA:          242.590d {+16h 10m 22s} (J2000),
                 242.798d {+16h 11m 12s} (current),
                 242.161d {+16h 08m 39s} (1950)
GRB_DEC:         +40.580d {+40d 34' 48"} (J2000),
                 +40.518d {+40d 31' 05"} (current),
                 +40.709d {+40d 42' 33"} (1950)
GRB_ERROR:       5.40 [deg radius, statistical only]
GRB_DATE:        20411 TJD;   102 DOY;   24/04/11
GRB_TIME:        6298.48 SOD {01:44:58.48} UT
GRB_PHI:         223.00 [deg]
GRB_THETA:        64.00 [deg]
E_RANGE:         44.032 - 279.965 [keV]
LOC_ALGORITHM:   41731 (Gnd S/W Version number)
SUN_POSTN:        20.04d {+01h 20m 10s}   +8.45d {+08d 26' 55"}
SUN_DIST:        117.17 [deg]   Sun_angle= 9.1 [hr] (West of Sun)
MOON_POSTN:       50.34d {+03h 21m 21s}  +21.78d {+21d 46' 44"}
MOON_DIST:       116.63 [deg]
MOON_ILLUM:      8 [%]
GAL_COORDS:       64.43, 47.18 [deg] galactic lon,lat of the burst (or transient)
ECL_COORDS:      225.82, 59.89 [deg] ecliptic lon,lat of the burst (or transient)
LC_URL:          http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240411073/quicklook/glg_lc_medres34_bn240411073.gif
LOC_URL:         http://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240411073/quicklook/glg_locplot_all_bn240411073.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 #36061
The Fermi GBM team reports the detection of a likely LONG GRB
At 01:44:58 UT on 11 Apr 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240411A (trigger 734492703.48149 / 240411073).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 242.6, Dec = 40.6 (J2000 degrees, equivalent to J2000 16h 10m, 40d 36'), with a statistical uncertainty of 5.4 degrees.
The angle from the Fermi LAT boresight is 64.0 degrees.
The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240411073/quicklook/glg_skymap_all_bn240411073.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/bn240411073/quicklook/glg_healpix_all_bn240411073.fit
The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240411073/quicklook/glg_lc_medres34_bn240411073.gif
GCN Circular #36068
A. Pal (Konkoly Observatory), J. Ripa, M. Dafcikova, M. Kolar, N. Werner (M= asaryk U.), M. Ohno, H. Takahashi (Hiroshima U.), L. Meszaros, B. Csak (Kon= koly Observatory), N. Husarikova, F. Munz , M. Topinka, M. Duriskova, L. Sz= akszonova, J.-P. Breuer, F. Hroch (Masaryk U.), T. Urbanec, M. Kasal, A. P= ovalac (Brno U. of Technology), J. Hudec, J. Kapus, M. Frajt (Spacemanic s.= r.o), R. Laszlo, M. Koleda (Needronix s.r.o), M. Smelko, P. Hanak, P. Lipov= sky (Technical U. of Kosice), G. Galgoczi (Wigner Research Center/Eotvos U.= ), Y. Uchida, H. Poon, H. Matake (Hiroshima U.), N. Uchida (ISAS/JAXA), T. = Bozoki (Eotvos U.), G. Dalya (Eotvos U.), T. Enoto (Kyoto U.), Zs. Frei (Eo= tvos U.), G. Friss (Eotvos U.), Y. Fukazawa, K. Hirose (Hiroshima U.), S. H= isadomi (Nagoya U.), Y. Ichinohe (Rikkyo U.), K. Kapas (Eotvos U.), L. L. K= iss (Konkoly Observatory), T. Mizuno (Hiroshima U.), K. Nakazawa (Nagoya U= .), H. Odaka (Univ of Tokyo), J. Takatsy (Eotvos U.), K. Torigoe (Hiroshima= U.), N. Kogiso, M. Yoneyama (Osaka Metropolitan U.), M. Moritaki (U. Tokyo= ), T. Kano (U. Michigan) -- the GRBAlpha collaboration.
The short-duration GRB 240411A (Fermi/GBM detection: GCN 36061; INTEGRAL/SPI-ACS peak detection at 2024-04-11 ~01:45:00 UT) was observed by the GRBAlpha 1U CubeSat (Pal et al. 2023, A&A, 677, 40; https://ui.adsabs.harvard.edu/abs/2023A%26A...677A..40P/abstract).
The sub-threshold detection was confirmed at the peak time 2024-04-11 01:45:00.0 UTC. The T90 duration measured by GRBAlpha is 1.0 s and the significance at the peak time reaches 4 sigma in the ~120-400 keV band.
The light curve obtained by GRBAlpha is available here: https://grbalpha.konkoly.hu/static/share/GRB240411A_GCN.pdf
All GRBAlpha detections are listed at: https://monoceros.physics.muni.cz/he= a/GRBAlpha/
GRBAlpha, launched on 2021 March 22, is a demonstration mission for a futur= e CubeSat constellation (Werner et al. Proc. SPIE 2018). The detector of GR= BAlpha consists of a 75 x 75 x 5 mm3 CsI scintillator read out by a SiPM ar= ray, covering the energy range from ~50 keV to ~1000 keV. To increase the d= uty cycle and the downlink rate, the upgrade of the on-board data acquisiti= on software stack is in progress. The ground segment is also supported by t= he radio amateur community and it takes advantage of the SatNOGS network fo= r increased data downlink volume.=20
GCN Circular #36090
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report:
The long-duration GRB 240411A (Fermi-GBM detection: The Fermi GBM team, GCN 36061; GRBAlpha detection: Pal et al., GCN 36068) was detected by Fermi (GBM trigger 734492703), INTEGRAL (SPI-ACS), Swift (BAT), Konus-Wind, and GRBAlpha at about 6298 s UT (01:44:58). The burst was outside the coded field of view of the BAT.
We have triangulated it to a preliminary, 3 sigma error box whose coordinates are:
```
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  246.889 (16h 27m 33s) +45.010 (+45d 00' 36")
 Corners:
  251.205 (16h 44m 49s) +41.318 (+41d 19' 05")
  251.479 (16h 45m 55s) +41.818 (+41d 49' 03")
  241.660 (16h 06m 38s) +48.434 (+48d 26' 03")
  241.553 (16h 06m 13s) +47.881 (+47d 52' 53")
 ---------------------------------------------
```
The error box area is 4.6 sq. deg, and its maximum dimension is 9.8 deg (the minimum one is 29 arcmin). The Sun distance was 111 deg.
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at http://www.ioffe.ru/LEA/GRBs/GRB240411_T06302/IPN/
The Konus-Wind time history and spectrum will be given in a forthcoming GCN Circular.
GCN Circular #36141
C.C. Cheung, R. Woolf, M. Kerr, J.E. Grove (NRL), A. Goldstein (USRA), C.A. Wilson-Hodge, D. Kocevski (MSFC), and M.S. Briggs (UAH) report:
The Glowbug gamma-ray telescope [1,2], operating on the International Space Station, reports the detection of GRB 240411A, which was also detected by Fermi/GBM (GCN 36061), GRBAlpha (GCN 36068), as well as INTEGRAL/SPI-ACS, S= wift/BAT, and Konus/Wind (GCN 36090).
Using an adaptive window with a resolution of 32-ms, the burst onset is det= ermined to be 2024-04-11 01:44:59.000 with a duration of 0.51 s and a total significance of about 25.8 sigma. The light curve comprises a single peak.
The analysis results presented here are preliminary and use a response func= tion that lacks a detailed characterization of the surrounding passive stru= cture of the ISS.
Glowbug is a NASA-funded technology demonstrator for sensitive, low-cost gamma-ray transient telescopes developed, built, and operated by the U.S. Naval Research Laboratory (NRL) with support from the University of Alabama in Huntsville, USRA, and NASA MSFC. It was launched on 2023 March 15 aboard the Department of Defense Space Test Program=E2=80=99s STP-H9 to the ISS. The detector comprises 12 large-area (15 cm x 15 cm) CsI:Tl panels covering the surface of a half cube, and two hexagonal (5-cm diameter, 10-cm length) CLLB scintillators, giving it a large field of view (instantaneous FoV ~2/3 sky) over a wide energy band of 50 keV to >2 MeV.
```
[1] Grove, J.E. et al. 2020, Proc. Yamada Conf. LXXI, arXiv:2009.11959
[2] Woolf, R.S. et al. 2022, Proc. SPIE, 12181, id. 121811O
[3] Goldstein, A. et al. 2020, ApJ 895, 40, arXiv :1909.03006
```
Distribution Statement A: Approved for public release. Distribution is unlimited.
GCN Circular #36156
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin on behalf of the MGNS/BepiColombo team,
J. Benkhoff on behalf of the BepiColombo team,
D. Svinkin, D. Frederiks, A. Lysenko, A. Ridnaia, and T. Cline on behalf of the Konus-Wind team,
A. Goldstein, M. S. Briggs, C. Wilson-Hodge, and E. Burns on behalf of the Fermi GBM team,
E. Bozzo and C. Ferrigno, on behalf of the INTEGRAL SPI-ACS GRB team,
and
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu on behalf of the Swift-BAT team, report:
Using the BepiColombo (MGNS) data we have improved the previous IPN error box (Svinkin et al., GCN 36090).
The coordinates of the updated 3 sigma error box are:
```
 ---------------------------------------------
  RA(2000), deg                 Dec(2000), deg
 ---------------------------------------------
 Center:
  248.823 (16h 35m 17s) +43.618 (+43d 37' 03")
 Corners:
  248.867 (16h 35m 28s) +43.236 (+43d 14' 08")
  248.814 (16h 35m 15s) +43.972 (+43d 58' 19")
  248.777 (16h 35m 07s) +43.999 (+43d 59' 57")
  248.831 (16h 35m 20s) +43.263 (+43d 15' 47")
---------------------------------------------
```
The error box area is 65 sq. arcmin, and its maximum dimension is 46 arcmin (the minimum one is 1 arcmin). The Sun distance was 111 deg.
This box may be further improved.
Updated triangulation map and HEALPix FITS files are posted at http://www.ioffe.ru/LEA/GRBs/GRB240411_T06302/IPN/
GCN Circular #36164
B. P. Gompertz, D. Steeghs, B. Godson; R. Starling, K. Ackley; M. J. Dyer; J. Lyman; K. Ulaczyk; F. Jimenez-Ibarra; A. Kumar; D. O'Neill; D. K. Galloway; V. Dhillon; P. O'Brien; G. Ramsay; K. Noysena; R. Kotak; R. P. Breton; L. K. Nuttall; E. Pall'e and D. Pollacco report on behalf of the GOTO collaboration:
We report on observations with the Gravitational-wave Optical Transient Observer (GOTO; Steeghs et al. 2022) in response to GRB 240411A (Fermi GBM Team, GCN 36061; Pal et al., GCN 36068; Cheung et al., 36141). Targeted observations began at 01:57:29 UT on 2024-04-11, 12 minutes after the GBM trigger. Each observation consisted of 4x90s exposures in the GOTO L-band (400-700 nm).
Images were processed immediately after acquisition using the GOTO pipeline. Difference imaging was performed using recent survey observations of the same pointings. Source candidates were initially filtered using a classifier (Killestein et al. 2021) and cross-matched against a variety of contextual and minor planet catalogues. Human vetting was carried out in real time on any candidates that passed the above checks.
No new candidate transient events are identified within the refined IPN error box (Kozyrev et al., GCN 36156). The 5-sigma limiting magnitude of the image is L > 19.7 at 12 minutes after trigger.
Magnitudes were calibrated using ATLAS-REFCAT2 (Tonry et al. 2018) and are not corrected for Galactic extinction.
GOTO (https://goto-observatory.org) is a network of telescopes that is principally funded by the STFC and operated at the Roque de los Muchachos Observatory on La Palma, Spain, and Siding Spring Observatory in NSW, Australia, on behalf of a consortium including the University of Warwick, Monash University, Armagh Observatory & Planetarium, the University of Leicester, the University of Sheffield, the National Astronomical Research Institute of Thailand (NARIT), the University of Turku, the University of Portsmouth, the University of Manchester and the Instituto de Astrofisica de Canarias (IAC).

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