GRB 240607A
GCN Circular 36661
Subject
GRB 240607A: GECAM detection of a bright long burst
Date
2024-06-11T16:27:47Z (a year ago)
From
wenlongzhang2018@163.com
Via
Web form
Wen-Long Zhang, Shao-Lin Xiong and Wen-Jun Tan report on behalf of the GECAM team:
GECAM-C detected a long burst, GRB 240607A, at 2024-06-07T11:01:14.31 UTC (T0), which was also detected by Fermi/GBM (GCN #36634), AstroSat-CZTI (GCN #36638), Konus-Wind (GCN #36659) .
According to the GECAM-C light curve, this burst shows multiple pulses with a total duration of ~30 sec.
We note that these results are very preliminary. Refined analysis will be reported later.
Gravitational wave high-energy Electromagnetic Counterpart All-sky Monitor (GECAM) mission originally consists of two microsatellites (GECAM-A and GECAM-B) launched in December 2020. As the third member of GECAM constellation, GECAM-C was launched onboard SATech-01 experimental satellite in July 2022. GECAM mission is funded by the Chinese Academy of Sciences (CAS).
GCN Circular 36659
Subject
Konus-Wind detection of GRB 240607A
Date
2024-06-11T13:55:10Z (a year ago)
From
Anna Ridnaia at Ioffe Institute <ridnaia@mail.ioffe.ru>
Via
Web form
A. Ridnaia, D. Frederiks, A. Lysenko, D. Svinkin,
A. Tsvetkova, M. Ulanov, and T. Cline,
on behalf of the Konus-Wind team, report:
The very bright, long-duration GRB 240607A
(Fermi-GBM detection: The Fermi GBM team, GCN 36634;
Dalessi, GCN 36637; Dalessi and Meegan, GCN 36641;
BALROG localization: Preis et al., GCN 36635;
AstroSat-CZTI detection: Waratkar et al., GCN 36638;
IPN triangulation: Kozyrev at al., GCN 36650)
triggered Konus-Wind at T0=39674.62 s UT (11:01:14.620).
The burst light curve shows a multipeaked structure
which starts at ~T0-0.2 s and has a total duration of ~24.7 s.
The emission is seen up to ~6 MeV.
The Konus-Wind light curve of this GRB is available at
http://www.ioffe.ru/LEA/GRBs/GRB240607_T39674/
As observed by Konus-Wind, the burst
had a fluence of 1.03(-0.06,+0.05)x10^-4 erg/cm2,
and a 64-ms peak flux, measured from T0+10.960 s,
of 3.02(-0.33,+0.34)x10^-5 erg/cm2/s
(both in the 20 keV - 10 MeV energy range).
The time-averaged spectrum of the burst
(measured from T0 to T0+29.440 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.94(-0.05,+0.05),
the high energy photon index beta = -2.92(-0.42,+0.22),
the peak energy Ep = 248(-13,+13) keV
(chi2 = 111/98 dof).
The spectrum near the maximum count rate
(measured from T0+10.752 to T0+11.264 s)
is best fit in the 20 keV - 10 MeV range
by the GRB (Band) model with the following parameters:
the low-energy photon index alpha = -0.21(-0.18,+0.19),
the high energy photon index beta = -2.77(-0.37,+0.20),
the peak energy Ep = 249(-24,+31) keV
(chi2 = 54/46 dof).
All the quoted errors are at the 90% confidence level.
All the quoted values are preliminary.
GCN Circular 36650
Subject
IPN triangulation of GRB 240607A
Date
2024-06-09T17:50:42Z (a year ago)
From
Dmitry Svinkin at Ioffe Institute <svinkin@mail.ioffe.ru>
Via
legacy email
A.S. Kozyrev, D.V. Golovin, M.L. Litvak, I.G. Mitrofanov, and A.B. Sanin
on behalf of the HEND/Mars Odyssey team,
D. Svinkin, D. Frederiks, A. Ridnaia, A. Lysenko,
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,
S. Barthelmy, J. Cummings, H. Krimm, D. Palmer, and A. Tohuvavohu
on behalf of the Swift-BAT team,
G. Waratkar, V. Jethwani, J.Joshi, V. Bhalerao, D. Bhattacharya,
and S. Vadawale, on behalf of the Astrosat-CZTI team,
and
W. Boynton, C. Fellows, K. Harshman, H. Enos, R. Starr,
and A.S. Gardner on on behalf of the GRS-Odyssey GRB team,
report:
The very bright, long-duration GRB 240607A
(Fermi-GBM detection: The Fermi GBM team, GCN 36634;
Dalessi, GCN 36637; Dalessi and Meegan, GCN 36641;
BALROG localization: Preis et al., GCN 36635;
AstroSat-CZTI detection detection: Waratkar et al., GCN 36638)
was detected by Fermi (GBM trigger 739450879), AstroSat (CZTI),
Konus-Wind, INTEGRAL (SPI-ACS), Swift (BAT), and Mars-Odyssey (HEND)
at about 39674 s UT (11:01:14).
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:
17.830 (01h 11m 19s) -29.324 (-29d 19' 25")
Corners:
17.686 (01h 10m 45s) -29.329 (-29d 19' 45")
18.025 (01h 12m 06s) -29.401 (-29d 24' 04")
17.974 (01h 11m 54s) -29.317 (-29d 19' 03")
17.634 (01h 10m 32s) -29.245 (-29d 14' 41")
---------------------------------------------
The error box area is 78 sq. arcmin, and its maximum
dimension is 22 arcmin (the minimum one is 4.2 arcmin).
The Sun distance was 76 deg.
The IPN localization is consistent with, but reduces the area of,
the Fermi-GBM final and the BALROG localizations.
This localization may be improved.
A triangulation map and HEALPix FITS file are posted at
http://www.ioffe.ru/LEA/GRBs/GRB240607_T39674/IPN
The HEALPix triangulation map is the multi-order HEALPix in units of probability density.
The Konus-Wind time history and spectrum will be given
in a forthcoming GCN Circular.
GCN Circular 36643
Subject
Fermi GRB 240607A: Global MASTER-Net observations report
Date
2024-06-08T00:15:47Z (a year ago)
From
Vladimir Lipunov at Moscow State U/Krylov Obs <lipunov@xray.sai.msu.ru>
Via
legacy email
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 240607A ( Fermi GBM team, GCN 36634) errorbox 46211 sec after notice time and 46269 sec after trigger time at 2024-06-07 23:52:24 UT, with upper limit up to 19.8 mag. The observations began at zenith distance = 82 deg. The sun altitude is -71.1 deg.
The galactic latitude b = -83 deg., longitude l = 258 deg.
Real time updated cover map and OT discovered available here:
https://master.sai.msu.ru/site/master2/observ.php?id=2485082
We obtain a following upper limits.
Tmid-T0 | Date Time | Site | Coord (J2000) |Filt.| Expt. | Limit| Comment
_________|_____________________|_____________________|____________________________________|_____|_______|_______|________
46300 | 2024-06-07 23:52:24 | MASTER-SAAO | (01h 07m 30.46s , -32d 11m 36.6s) | C | 60 | 19.4 |
46360 | 2024-06-07 23:52:24 | MASTER-SAAO | (01h 07m 30.47s , -32d 11m 36.5s) | C | 180 | 19.6 | Coadd
46379 | 2024-06-07 23:53:43 | MASTER-SAAO | (01h 07m 36.97s , -32d 11m 29.9s) | C | 60 | 19.3 |
46459 | 2024-06-07 23:55:03 | MASTER-SAAO | (01h 07m 34.10s , -32d 09m 58.5s) | C | 60 | 19.2 |
46544 | 2024-06-07 23:56:28 | MASTER-SAAO | (01h 07m 34.25s , -32d 10m 58.2s) | C | 60 | 19.4 |
46604 | 2024-06-07 23:56:28 | MASTER-SAAO | (01h 07m 34.26s , -32d 10m 58.1s) | C | 180 | 19.7 | Coadd
46624 | 2024-06-07 23:57:47 | MASTER-SAAO | (01h 07m 38.48s , -32d 09m 41.5s) | C | 60 | 19.4 |
46703 | 2024-06-07 23:59:07 | MASTER-SAAO | (01h 07m 31.69s , -32d 10m 22.6s) | C | 60 | 19.4 |
46782 | 2024-06-08 00:00:26 | MASTER-SAAO | (01h 07m 32.38s , -32d 09m 21.6s) | C | 60 | 19.5 |
46842 | 2024-06-08 00:00:26 | MASTER-SAAO | (01h 07m 32.39s , -32d 09m 21.4s) | C | 180 | 19.7 | Coadd
46861 | 2024-06-08 00:01:45 | MASTER-SAAO | (01h 07m 38.82s , -32d 10m 20.7s) | C | 60 | 19.4 |
46941 | 2024-06-08 00:03:05 | MASTER-SAAO | (01h 07m 31.52s , -32d 11m 20.1s) | C | 60 | 19.5 |
47020 | 2024-06-08 00:04:24 | MASTER-SAAO | (01h 07m 38.65s , -32d 11m 10.1s) | C | 60 | 19.5 |
47080 | 2024-06-08 00:04:24 | MASTER-SAAO | (01h 07m 38.65s , -32d 11m 10.0s) | C | 180 | 19.8 | Coadd
47099 | 2024-06-08 00:05:43 | MASTER-SAAO | (01h 07m 35.45s , -32d 09m 43.5s) | C | 60 | 19.5 |
47178 | 2024-06-08 00:07:02 | MASTER-SAAO | (01h 07m 35.53s , -32d 11m 10.8s) | C | 60 | 19.5 |
47258 | 2024-06-08 00:08:22 | MASTER-SAAO | (01h 07m 39.61s , -32d 09m 40.1s) | C | 60 | 19.4 |
47337 | 2024-06-08 00:09:41 | MASTER-SAAO | (01h 07m 32.15s , -32d 10m 18.7s) | C | 60 | 19.5 |
47416 | 2024-06-08 00:11:00 | MASTER-SAAO | (01h 07m 32.44s , -32d 09m 19.0s) | C | 60 | 19.5 |
Filter C is a clear (unfiltred) band.
The observation and reduction will continue.
The message may be cited.
GCN Circular 36641
Subject
GRB 240607A: Fermi GBM Observation
Date
2024-06-07T20:46:46Z (a year ago)
From
Sarah Dalessi at UAH <sd0104@uah.edu>
Via
Web form
S. Dalessi (UAH) and C. Meegan (UAH) report on behalf of
the Fermi Gamma-ray Burst Monitor Team:
"At 11:01:14.31 UT on 07 June 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240607A (trigger 739450879/240607459),
which was also detected by AstroSat (G. Waratkar et al. 2024, GCN 36638) and INTEGRAL/SPI-ACS (trigger #10733). The final localization can be found in GCN 36634 as well as the notice of a bright burst (S. Dalessi et al. 2024, GCN 36637).
The angle from the Fermi LAT boresight is 109 degrees.
The GBM light curve three pulses with a duration (T90)
of about 20.2 s (50-300 keV). The time-averaged spectrum
from T0+0.002 to T0+27.136 s is best fit by
a Band function with Epeak = 247 +/- 4 keV,
alpha = -0.92 +/- 0.01, and beta = -2.69 +/- 0.07.
The event fluence (10-1000 keV) in this time interval is
(9.2 +/- 0.5)E-05 erg/cm^2. The 1-sec peak photon flux measured
starting from T0+11 s in the 10-1000 keV band is 95.8 +/- 0.8 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 36638
Subject
GRB 240607A: AstroSat CZTI detection of bright long burst
Date
2024-06-07T14:17:26Z (a year ago)
From
Gaurav Waratkar at IIT Bombay <gauravwaratkar@iitb.ac.in>
Via
Web form
G. Waratkar (IITB), V. Jethwani (IITB), A. Dasgupta (BITS Hyderabad), J. Joshi (IUCAA), 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 the bright long-duration GRB 240607A which was also detected by Fermi-GBM (GCN Circ. 36634).
The source was clearly 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 2024-06-07 11:01:25.500 UTC. The measured peak count rate associated with the burst is 880 (+57, -64) counts/s above the background in the combined data of all quadrants, with a total of 3987 (+214, -257) counts. The local mean background count rate was 447 (+5, -5) counts/s. Using cumulative rates, we measure a T90 of 12.3 (+0.3, -0.4) s.
It was also clearly 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 2024-06-07 11:01:24.9 UTC. The measured peak count rate is 4919 (+128, -137) counts/s above the background in the combined Veto data of all quadrants, with a total of 23001 (+510, -531) counts. The local mean background count rate was 1474 (+5, -5) counts/s. We measure a T90 of 12.6 (+0.2, -0.2) 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
GCN Circular 36637
Subject
GRB 240607A: Fermi GBM detection of a very bright burst
Date
2024-06-07T13:01:40Z (a year ago)
From
Sarah Dalessi at UAH <sd0104@uah.edu>
Via
Web form
S. Dalessi (UAH) reports on behalf of the Fermi GBM Team:
"At 11:01:14.31 UT on 7 June 2024, the Fermi Gamma-ray Burst Monitor (GBM)
triggered and located GRB 240607A (trigger 739450879/240607459). The final localization can be found in GCN 36634.
The GBM light curve consists of three bright pulses, with the bulk of the emission during the first 15 seconds, and continued emission out to roughly 30 seconds. This event is a very bright GRB (up to 10,000 counts/s over 50-300 keV) and follow-up across all wavelengths is encouraged.
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 17.8, Dec = -32.1 (J2000 degrees, equivalent to J2000 01h 11m, -32d 06'), with a statistical uncertainty of 1.0 degrees.
(radius, 1-sigma containment,
statistical only; there is additionally a systematic
error which we have characterized as a core-plus-tail model, with 90% of
GRBs having a 3.7 deg error and a small tail suffering a larger than 10 deg systematic error. [Connaughton et al. 2015, ApJS, 216, 32] ).
The angle from the Fermi LAT boresight is 109.0 degrees.
GCN Circular 36635
Subject
GRB 240607A: BALROG localization (Fermi Trigger 739450879 / GRB 240607459)
Date
2024-06-07T11:45:34Z (a year ago)
From
Jochen Greiner at MPE <jcgrog@mpe.mpg.de>
Via
email
T. Preis, B. Biltzinger, J. Burgess & J. Greiner (all MPE Garching) report:
The public trigdat data of the Fermi Gamma-ray Burst Monitor (GBM) trigger
739450879 at 11:01:14 on 07 June 2024 were automatically fitted for spectrum
and sky location with BALROG (Burgess et al. 2018, MNRAS 476, 1427;
Berlato et al. 2019, ApJ 873, 60).
The best-fit position is:
RA(2000.0) = 17.7 deg
Decl.(2000.0) = -28.8 deg
The 1 sigma statistical error radius is 0.9 deg.
We estimate an additional systematic error of 1 deg.
Further details are available at:
https://grb.mpe.mpg.de/grb/GRB240607459/
The Healpix map can be downloaded from:
https://grb.mpe.mpg.de/grb/GRB240607459/healpix
The location parameters are available as JSON at:
https://grb.mpe.mpg.de/grb/GRB240607459/json
GCN Circular 36634
Subject
GRB 240607A: Fermi GBM Final Real-time Localization
Date
2024-06-07T11:11:36Z (a year ago)
From
Fermi GBM Team at MSFC/Fermi-GBM <do_not_reply@GIOC.nsstc.nasa.gov>
Via
email
The Fermi GBM team reports the detection of a likely LONG GRB
At 11:01:14 UT on 7 Jun 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240607A (trigger 739450879.31047 / 240607459).
The on-ground calculated location, using the Fermi GBM trigger data, is RA = 17.8, Dec = -32.1 (J2000 degrees, equivalent to J2000 01h 11m, -32d 06'), with a statistical uncertainty of 1.0 degrees.
The angle from the Fermi LAT boresight is 109.0 degrees.
The skymap can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240607459/quicklook/glg_skymap_all_bn240607459.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/bn240607459/quicklook/glg_healpix_all_bn240607459.fit
The GBM light curve can be found here:
https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240607459/quicklook/glg_lc_medres34_bn240607459.gif