GRB240824B

This page lists all entries on GRB240824B in GRBweb

Summary Fermi GBM IPN Swift GCN 37260 GCN 37261 GCN 37266 GCN 37267 GCN 37270 GCN 37281 GCN 37284 GCN 37286 GCN 37305

Summary table
Variable Value Source
GRB_name_Fermi GRB240824549
T0 13:10:30 UTC GCN_circulars,MAXI Det
ra 17.8367° Swift
decl 2.6100° Swift
pos_error 5.82e-04° Swift
T90 1.536 s Fermi_GBM
T90_error 0.815 s Fermi_GBM
T90_start 13:11:15.483 UTC Fermi_GBM
fluence 1.06e-07 erg/cm² Fermi_GBM
fluence_error 9.27e-09 erg/cm² Fermi_GBM
T100 47.019 s
GBM_located False
mjd 60546.54895833333 GCN_circulars,MAXI Det
Fermi GBM table
GRB_name_Fermi GRB240824549
trigger_name bn240824549
ra 17.2500°
decl -21.8600°
pos_error 1.43e+01°
datum 2024-08-24
t_trigger 13:11:16.699 UTC
T90 1.536 s
T90_error 0.815 s
T90_start 13:11:15.483 UTC
fluence 1.06e-07 erg/cm²
fluence_error 9.27e-09 erg/cm²
flux_1024 1.42e+00 erg/cm²/s
flux_1024_error 2.12e-01 erg/cm²/s
flux_1024_time -6.40e-01 erg/cm²/s
flux_64 2.47e+00 erg/cm²/s
flux_64_error 9.09e-01 erg/cm²/s
IPN table
GRB_name GRB240824B
ra 17.6708°
decl 2.0833°
pos_error 2.67e-01°
Swift table
GRB_name GRB240824B
t_trigger 13:11:16.700 UTC
ra 17.8367°
decl 2.6100°
pos_error 5.82e-04°
GCN 37260 table
GRB_name GRB240824B
GCN_number 37260
Detection_method Fermi GBM final loc
t_trigger 13:11:16 UTC
ra 17.5000°
decl -23.3000°
Circular_text TITLE: GCN CIRCULAR NUMBER: 37260 SUBJECT: GRB 240824B: Fermi GBM Final Real-time Localization DATE: 24/08/24 13:21:51 GMT FROM: Fermi GBM Team at MSFC/Fermi-GBM The Fermi GBM team reports the detection of a likely SHORT GRB At 13:11:16 UT on 24 Aug 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240824B (trigger 746197881.698742 / 240824549). The on-ground calculated location, using the Fermi GBM trigger data, is RA = 17.5, Dec = -23.3 (J2000 degrees, equivalent to J2000 01h 10m, -23d 18'), with a statistical uncertainty of 28.2 degrees. The angle from the Fermi LAT boresight is 72.0 degrees. The skymap can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240824549/quicklook/glg_skymap_all_bn240824549.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/bn240824549/quicklook/glg_healpix_all_bn240824549.fit The GBM light curve can be found here: https://heasarc.gsfc.nasa.gov/FTP/fermi/data/gbm/triggers/2024/bn240824549/quicklook/glg_lc_medres34_bn240824549.gif
GCN 37261 table
GRB_name GRB240824B
GCN_number 37261
Detection_method MAXI Det
t_trigger 13:10:30 UTC
ra 17.6720°
decl 2.0830°
Circular_text TITLE: GCN CIRCULAR NUMBER: 37261 SUBJECT: GRB 240824B: MAXI/GSC detection DATE: 24/08/24 15:49:41 GMT FROM: Motoko Serino at Aoyama Gakuin U. M. Nakajima (Nihon U.), M. Serino, S. Sugita (AGU), H. Negoro, Y. Kudo, H. Shibui, K. Takagi, H. Takahashi, K. Tatano, H. Nishio (Nihon U.), T. Mihara, T. Kawamuro, S. Yamada, S. Wang, T. Tamagawa, N. Kawai, M. Matsuoka (RIKEN), T. Sakamoto, Y. Kawakubo, H. Hiramatsu, H. Nishikawa, Y. Kondo, A. Yoshida (AGU), Y. Tsuboi, H. Sugai, N. Nagashima (Chuo U.), M. Shidatsu, Y. Niida (Ehime U.), I. Takahashi, M. Niwano, N. Higuchi, Y. Yatsu (Tokyo Tech), S. Nakahira, S. Ueno, H. Tomida, M. Ishikawa, S. Ogawa, M. Kurihara (JAXA), Y. Ueda, Y. Okada (Kyoto U.), M. Yamauchi, Y. Otsuki, T. Hasegawa, M. Nishio (Miyazaki U.), K. Yamaoka (Nagoya U.), M. Sugizaki (Kanazawa U.), W. Iwakiri (Chiba U.) report on behalf of the MAXI team: The MAXI/GSC nova alert system triggered a bright uncatalogued X-ray transient source at 13:10:30 UT on 24 Aug 2024. Assuming that the source flux was constant over the transit, we obtain the source position at (R.A., Dec) = (17.672 deg, 2.083 deg) = (01 10 41, +02 04 58) (J2000) with a statistical 90% C.L. elliptical error region with long and short radii of 0.27 deg and 0.07 deg, respectively. The roll angle of long axis from the north direction is 136.0 deg counterclockwise. There is an additional systematic uncertainty of 0.1 deg (90% containment radius). This position is within the error of GRB 240824B detected by Fermi GBM (GCN #37260). The X-ray flux averaged over the scan was 45 +- 15 mCrab (4.0-10.0keV, 1 sigma error). There was no significant excess flux in the previous transit at 11:37 UT and in the next transit at 14:43 UT with an upper limit of 20 mCrab for each.
GCN 37266 table
GRB_name GRB240824B
GCN_number 37266
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 37266 SUBJECT: GRB 240824B: Swift ToO observations DATE: 24/08/24 20:50:24 GMT FROM: Phil Evans at U of Leicester P. A. Evans (U. Leicester) reports on behalf of the Swift team: Swift has initiated a ToO observation of the Swift/BAT GRB 240824B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021705 Any uncatalogued X-ray sources detected in this analysis will be reported on this website and via GCN COUNTERPART notices. These are not necessarily related to the Swift/BAT event. Any X-ray source considered to be a probable afterglow candidate will be reported via a GCN Circular after manual consideration. Details of the XRT automated analysis methods are detailed in Evans et al. (2007, A&A, 469, 379; 2009, MNRAS, 397, 1177 and 2014, ApJS, 210, 8). This circular is an official product of the Swift-XRT team.
GCN 37267 table
GRB_name GRB240824B
GCN_number 37267
Detection_method Swift-BAT Det
ra 17.8350°
decl 2.6200°
Circular_text TITLE: GCN CIRCULAR NUMBER: 37267 SUBJECT: GRB 240824B: Swift/BAT arcminute localization of a burst DATE: 24/08/24 21:21:35 GMT FROM: Jimmy DeLaunay at Penn State 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 240824B onboard (T0: 2024-08-24T13:11:16.7 UTC, Fermi Trigger 746197881, MAXI GCN 37261). In a ground search of a 10 s event file, available due to a subthreshold trigger onboard. The GRB was detected at a S/N of 8.5 in a single 10 s image. The duration in the rates data is ~16 s. The BAT position is RA, Dec = 17.835, +2.620 deg which is RA(J2000) = 01h 11m 20.4s Dec(J2000) = +02d 37′ 12.0″ with an estimated uncertainty of 3 arcmin radius. XRT and UVOT follow-up has been requested. Results of follow-up observations will be reported in future circulars.
GCN 37270 table
GRB_name GRB240824B
GCN_number 37270
Detection_method Swift-XRT Other
ra 17.8367°
decl 2.6100°
Circular_text TITLE: GCN CIRCULAR NUMBER: 37270 SUBJECT: GRB 240824B: Swift-XRT afterglow detection DATE: 24/08/25 13:38:49 GMT FROM: Phil Evans at U of Leicester J.A. Kennea (PSU), D.N. Burrows (PSU), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), V. D'Elia (SSDC & INAF-OAR), S. Dichiara (PSU) and P.A. Evans (U. Leicester) reports on behalf of the Swift-XRT team: Swift-XRT has performed follow-up observations of the Swift/BAT, MAXI and Fermi-GBM-detected burst GRB 240824B (GCN #37260, #37261, #37266, #37267) collecting 4.1 ks of Photon Counting (PC) mode data between T0+27.7 ks and T0+52.3 ks. Two uncatalogued X-ray sources are detected consistent with being within 296 arcsec of the Swift/BAT position, of which one ("Source 1") is fading with 2.4 sigma significance and thus is believed to be the GRB afterglow. Using 732 s of PC mode data and 1 UVOT image, we find an enhanced XRT position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 17.83675, +2.60999 which is equivalent to: RA (J2000): 01h 11m 20.82s Dec(J2000): +02d 36' 36.0" with an uncertainty of 4.5 arcsec (radius, 90% confidence). This position is 36 arcsec from the Swift/BAT position. The light curve can be modelled with a power-law decay with a decay index of alpha=3.1 (+0.5, -2.1). The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/00021705. The results of the full analysis of the XRT observations are available at https://www.swift.ac.uk/ToO_GRBs/00021705. This circular is an official product of the Swift-XRT team.
GCN 37281 table
GRB_name GRB240824B
GCN_number 37281
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 37281 SUBJECT: GRB 240824B: NOT optical upper limit DATE: 24/08/25 18:42:26 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University D. B. Malesani (DAWN/NBI and Radboud Univ.), A. Martin-Carrillo (UCD), J. Terwel (NOT and TCD), report on behalf of a larger collaboration: We observed the field of GRB 240824B (Fermi GBM team, GCN 37260; Nakajima et al., GCN 37261; DeLaunay et al., GCN 37267) using the Nordic Optical Telescope (NOT) located in the Canary Islands. Observations consisted of three r-band exposures for a total of 900 s, with a mid time 2024 Aug 25.053 UT (12.1 hr after the trigger). The seeing was unfortunately poor, with a delivered PSF of ~2". In the stack of our images, no source is detected at a location consistent with the candidate X-ray afterglow error circle (Kennea et al., GCN 37270), down to a 3-sigma limiting magnitude r = 22 (AB, calibrated against nearby sources from the Pan-STARRS catalog).
GCN 37284 table
GRB_name GRB240824B
GCN_number 37284
Detection_method Fermi GBM Det
t_trigger 13:11:16.700 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 37284 SUBJECT: GRB 240824B: Fermi GBM Observation DATE: 24/08/25 20:38:41 GMT FROM: Vidushi Sharma at NASA GSFC/UMBC V. Sharma (NASA GSFC/UMBC), and C. Meegan (UAH) report on behalf of the Fermi Gamma-ray Burst Monitor Team: At 13:11:16.70 UT on 24 August 2024, the Fermi Gamma-ray Burst Monitor (GBM) triggered and located GRB 240824B (trigger 746197881/240824549), which was also detected by MAXI/GSC detection (M. Nakajima et al., 2024, GCN 37261), Swift-BAT (J. DeLaunay et al. 2024, GCN 37267), and Swift-XRT (A. Tohuvavohu et al. 2024, GCN 37269 and J.A. Kennea et al. 2024, GCN 37270). The Final Real-time Localization (Fermi GBM Team 2024, GCN 37260) is consistent with the MAXI/GSC, and Swift. The angle from the Fermi LAT boresight is 79 degrees. The GBM light curve many short peaks with a duration (T90) of about 1.5 s (50-300 keV). The time-averaged spectrum from T0-0.96 to T0+0.90 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -0.83 +/- 0.38 and the cutoff energy, parameterized as Epeak, is 339 +/- 200 keV. The event fluence (10-1000 keV) in this time interval is (4 +/- 1)E-07 erg/cm^2. The 64-ms peak photon flux measured starting from T0-0.64 s in the 10-1000 keV band is 3 +/- 1 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 37286 table
GRB_name GRB240824B
GCN_number 37286
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 37286 SUBJECT: GRB 240824B: KAIT optical upper limit DATE: 24/08/25 21:22:49 GMT FROM: Weikang Zheng at UC Berkeley WeiKang Zheng and Alexei V. Filippenko (UC Berkeley) report on behalf of the KAIT GRB team: The 0.76-m Katzman Automatic Imaging Telescope (KAIT), located at Lick Observatory, responded to GRB 240824B (Fermi GBM team, GCN 37260; Nakajima et al., GCN 37261; DeLaunay et al., GCN 37267; Sharma et al., GCN 37284) starting at 06:53 UT, Aug. 25, ~17.70 hours after the burst. A total of 180 x 60s images were obtained in the clear (roughly R) filters. We did not detect any new optical counterpart candidate within the Swift/XRT X-ray afterglow (Source 1) error circle reported by Kennea et al. (GCN 37270) in our coadd image, which we estimate the limiting magnitude to be ~21.0 mag at a mid time of 20.70 hours after the burst, consistent with the upper limit report from Malesani et al. (GCN 37281).
GCN 37305 table
GRB_name GRB240824B
GCN_number 37305
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 37305 SUBJECT: GRB 240824B: Ondrejov D50 optical limit DATE: 24/08/26 21:44:19 GMT FROM: Martin Jelinek at Astro.Inst-AVCR,Ondrejov Martin Jelinek, Jan Strobl, Alzbeta Malenakova, Rene Hudec and Cyril Polasek (ASU CAS Ondrejov, CZ), report: We observed the Swift-XRT localization (Kennea et al. GCN 37270) of the Fermi/GBM (Fermi GBM Team GCN 37260, Sharma et al. GCN 37284), MAXI/GSC (Nakajima et al. GCN 37261) and Swift/BAT (DeLaunay et al. GCN 37267) detected GRB 240824A with the 50 cm robotic telescope (D50) of Ondrejov observatory in Czech republic. We obtained a set of 120 s Sloan-i' band exposures starting at 00:10 UT, i.e. 10.985 h after the initial trigger. Consistently with Malesani et al. (GCN 37281) and Zheng et al (GCN 37286), we do not detect any emission in or near the Swift-XRT error box. The magnitude limit of our 2.15 h summed integration with a mean time T-T0 12.067 h post burst is i' > 21.3 (AB).