GRB240419B

This page lists all entries on GRB240419B in GRBweb

Summary IPN Swift GCN 36180 GCN 36186 GCN 36188 GCN 36191 GCN 36192 GCN 36197 GCN 36283 GCN 36292

Summary table
Variable Value Source
T0 12:22:52 UTC GCN_circulars,Swift Det
ra 325.8968° Swift
decl 4.2348° Swift
pos_error 3.24e-04° Swift
GBM_located False
mjd 60419.51587962963 GCN_circulars,Swift Det
IPN table
GRB_name GRB240419B
ra 325.8750°
decl 4.2333°
pos_error 5.00e-02°
Swift table
GRB_name GRB240419B
t_trigger 12:22:52 UTC
ra 325.8968°
decl 4.2348°
pos_error 3.24e-04°
GCN 36180 table
GRB_name GRB240419B
GCN_number 36180
Detection_method Swift Det
t_trigger 12:22:52 UTC
ra 325.8770°
decl 4.2340°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36180 SUBJECT: GRB 240419B: Swift detection of a burst DATE: 24/04/19 12:43:36 GMT FROM: Jamie Kennea at Penn State S. Dichiara (PSU), J.D. Gropp (PSU), R. Gupta (NASA/GSFC), F. E. Marshall (NASA/GSFC), M. J. Moss (GSFC), P. T. O'Brien (U Leicester), M. H. Siegel (PSU) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 12:22:52 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240419B (trigger=1223072). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 325.877, +4.234 which is RA(J2000) = 21h 43m 30s Dec(J2000) = +04d 14' 01" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure lasted for ~40 seconds and returned to background before showing three bright pulses at ~100 seconds for a total duration of 160 seconds. The peak count rate was ~2049 counts/sec (15-350 keV), at ~119 sec after the trigger. The XRT began observing the field at 12:25:20.7 UT, 148.4 seconds after the BAT trigger. Using promptly downlinked data we find a bright, uncatalogued X-ray source located at RA, Dec 325.89615, 4.23548 which is equivalent to: RA(J2000) = 21h 43m 35.08s Dec(J2000) = +04d 14' 07.7" with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 68 arcseconds from the BAT onboard position, within the BAT error circle. This position may be improved as more data are received; the latest position is available at https://www.swift.ac.uk/sper. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 6.84 x 10^20 cm^-2 (Willingale et al. 2013). The initial flux in the 2.5 s image was 7.01e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 158 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The 2.7'x2.7' sub-image covers 100% of the XRT error circle. The typical 3-sigma upper limit has been about 19.6 mag. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. The list of sources is typically complete to about 18 mag. No correction has been made for the expected extinction corresponding to E(B-V) of 0.077. Burst Advocate for this burst is S. Dichiara (sbd5667 AT psu.edu). Please contact the BA by email if you require additional information regarding Swift followup of this burst. In extremely urgent cases, after trying the Burst Advocate, you can contact the Swift PI by phone (see Swift TOO web site for information: http://www.swift.psu.edu/)
GCN 36186 table
GRB_name GRB240419B
GCN_number 36186
Detection_method Swift-XRT Det
ra 325.8968°
decl 4.2348°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36186 SUBJECT: GRB 240419B: Enhanced Swift-XRT position DATE: 24/04/19 17:38:53 GMT FROM: Phil Evans at U of Leicester J.P. Osborne, A.P. Beardmore, P.A. Evans and M.R. Goad (U. Leicester) report on behalf of the Swift-XRT team. Using 1231 s of XRT Photon Counting mode data and 3 UVOT images for GRB 240419B, we find an astrometrically corrected X-ray position (using the XRT-UVOT alignment and matching UVOT field sources to the USNO-B1 catalogue): RA, Dec = 325.89679, +4.23479 which is equivalent to: RA (J2000): 21h 43m 35.23s Dec (J2000): +04d 14' 05.2" with an uncertainty of 2.5 arcsec (radius, 90% confidence). This position may be improved as more data are received. The latest position can be viewed at http://www.swift.ac.uk/xrt_positions. Position enhancement is described by Goad et al. (2007, A&A, 476, 1401) and Evans et al. (2009, MNRAS, 397, 1177). This circular was automatically generated, and is an official product of the Swift-XRT team.
GCN 36188 table
GRB_name GRB240419B
GCN_number 36188
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 36188 SUBJECT: Swift GRB 240419B: Global MASTER-Net observations report DATE: 24/04/19 19:36:52 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs 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) was pointed to the Swift GRB 240419B ( S. Dichiara et al., GCN 36180) errorbox 24752 sec after notice time and 24919 sec after trigger time at 2024-04-19 19:18:11 UT, with upper limit up to 15.6 mag. Observations started at twilight. The observations began at zenith distance = 69 deg. The sun altitude is -11.0 deg. The galactic latitude b = -35 deg., longitude l = 61 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2427564 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 25009 | MASTER-Amur | C | 180 | 15.1 | 25009 | MASTER-Amur | C | 180 | 15.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 36191 table
GRB_name GRB240419B
GCN_number 36191
Detection_method Optical
ra 325.8970°
decl 4.2348°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36191 SUBJECT: GRB 240419B: optical afterglow from the NOT DATE: 24/04/20 06:40:47 GMT FROM: Daniele B. Malesani at IMAPP / Radboud University Daniele B. Malesani (DAWN/NBI and Radboud Univ.) and David Jones (NOT) report on behalf of a larger collaboration. We observed the field of GRB 240419B (Dichiara et al., GCN 36180) with the Nordic Optical Telescope (NOT) equipped with the ALFOSC camera. Observations were carried out straddling the morning twilight, at airmass ~2, and the seeing was about 1.7". An object consistent with the X-ray localization error circle (Osborne et al., GCN 36186) is detected in our images. Its coordinates are (J2000): RA = 21:43:35.289 Dec = +04:14:05.30 Calibrating against nearby point-like sources from the Pan-STARRS catalog, we measure the following AB magnitudes: r = 22.01 +- 0.10 (Apr 20.214 UT, or 0.698 days after the trigger); z = 20.81 +- 0.19 (Apr 20.222 UT, or 0.701 days after the trigger). This object is not visible in the Legacy Survey images, which are deeper than ours, and we thus conclude that it is the optical afterglow of GRB 240419B. We note however the presence of a fainter (r ~ 23.2), distinct source visible in the Legacy Survey, approximately 2.5" to the west of the afterglow. Given the relatively large offset, the relation of this object with the GRB is unclear.
GCN 36192 table
GRB_name GRB240419B
GCN_number 36192
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 36192 SUBJECT: GRB 240419B: Swift-XRT refined Analysis DATE: 24/04/20 08:11:17 GMT FROM: Phil Evans at U of Leicester J.P. Osborne (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), C. Salvaggio (INAF-OAB), J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), K.L. Page (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 7.5 ks of XRT data for GRB 240419B, from 141 s to 52.1 ks after the BAT trigger. The data comprise 282 s in Windowed Timing (WT) mode (the first 6 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The late-time light curve (from T0+4.6 ks) can be modelled with a power-law decay with a decay index of alpha=1.02 (+0.12, -0.11). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.95 (+/-0.05). The best-fitting absorption column is 1.21 (+0.16, -0.15) x 10^21 cm^-2, in excess of the Galactic value of 6.8 x 10^20 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 2.08 (+0.20, -0.19) and a best-fitting absorption column of 1.2 (+/-0.5) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 3.2 x 10^-11 (4.2 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 1.2 (+/-0.5) x 10^21 cm^-2 Galactic foreground: 6.8 x 10^20 cm^-2 Excess significance: 1.7 sigma Photon index: 2.08 (+0.20, -0.19) If the light curve continues to decay with a power-law decay index of 1.02, the count rate at T+24 hours will be 10.0 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 3.2 x 10^-13 (4.2 x 10^-13) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01223072. This circular is an official product of the Swift-XRT team.
GCN 36197 table
GRB_name GRB240419B
GCN_number 36197
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 36197 SUBJECT: GRB 240419B: Swift/UVOT Upper Limits DATE: 24/04/20 15:20:59 GMT FROM: Sam Shilling at Lancaster University S. P. R. Shilling (Lancaster U.), S. R. Oates (Lancaster U.), A. A. Breeveld (UCL-MSSL), N. P. M. Kuin (UCL-MSSL) and S. Dichiara (PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 240419B 159 s after the BAT trigger (Dichiara et al., GCN Circ. 36180). No optical afterglow consistent with either the enhanced XRT position (Osborne et al., GCN Circ. 36186) or the NOT optical afterglow position (Malesani et al., GCN Circ. 36191) is detected in the initial UVOT exposures. Preliminary 3-sigma upper limits using the UVOT photometric system (Breeveld et al. 2011, AIP Conf. Proc. 1358, 373) for the first finding chart (FC) exposures and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 159 308 147 >20.3 u_FC 317 567 246 >19.5 white 159 790 186 >20.4 v 647 667 19 >17.3 b 572 765 39 >18.6 u 317 741 265 >19.5 w1 696 716 19 >17.5 m2 672 691 19 >17.2 w2 623 643 19 >17.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.077 in the direction of the burst (Schlegel et al. 1998).
GCN 36283 table
GRB_name GRB240419B
GCN_number 36283
Detection_method Fermi LAT Other
ra 327.0800°
decl 3.0600°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36283 SUBJECT: IceCube-240424A - IceCube observation of a high-energy neutrino candidate track-like event DATE: 24/04/24 14:00:19 GMT FROM: A. Zegarelli at Ruhr University Bochum The IceCube Collaboration (http://icecube.wisc.edu/) reports: On 2024-04-24 at 01:49:26.0 UT IceCube detected a track-like event with a high probability of being of astrophysical origin. The event was selected by the ICECUBE_Astrotrack_GOLD alert stream. The average astrophysical neutrino purity for Gold alerts is 50%. This alert has an estimated false alarm rate of 1.225 events per year due to atmospheric backgrounds. The IceCube detector was in a normal operating state at the time of detection. After the initial automated alert (https://gcn.gsfc.nasa.gov/notices_amon_g_b/139315_50057906.amon), more sophisticated reconstruction algorithms have been applied offline, with the direction refined to: Date: 2024-04-24 Time: 01:49:26.0 UT RA: 327.08 (+2.06, -1.70 deg 90% PSF containment) J2000 Dec: 3.06 (+1.37, -1.33 deg 90% PSF containment) J2000 We encourage follow-up by ground and space-based instruments to help identify a possible astrophysical source for the candidate neutrino. Two Fermi-LAT sources (listed in the 4FGL-DR4 or 3FHL catalogs) are located in the 90% uncertainty region. The nearest gamma-ray source in either catalog is 4FGL J2149.6+0323 (J2149.8+0322 in the 3FHL catalog) at RA: 327.42 deg and DEC: 3.40 deg (0.5 deg away from the best-fit position). The second one is 4FGL J2146.8+0425 at RA: 326.71 deg and DEC: 4.43 deg, 1.4 deg away from the best-fit position. The former source is associated with a BL Lac object, while the latter is a blazar candidate of uncertain type. Additionally, we note that a recent GRB triggered by the Swift Burst Alert Catalog (BAT) on April 19, 2024 (GRB 240419B, detection time 2024-04-19 12:22:52 UT, GCN Circular #36180), is contained within the 90% uncertainty region of the neutrino candidate event, ~1.7 deg from its best-fit position. The IceCube Neutrino Observatory is a cubic-kilometer neutrino detector operating at the geographic South Pole, Antarctica. The IceCube realtime alert point of contact can be reached at roc@icecube.wisc.edu
GCN 36292 table
GRB_name GRB240419B
GCN_number 36292
Detection_method Swift-BAT Det
ra 325.8530°
decl 4.2990°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36292 SUBJECT: GRB 240419B: Swift-BAT refined analysis DATE: 24/04/24 21:47:33 GMT FROM: Sibasish Laha at GSFC T. Sakamoto (AGU), S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC), M. J. Moss (GSFC), D. M. Palmer (LANL), T. Parsotan (GSFC),(i.e. the Swift-BAT team): Using the data set from T-61 to T+242 sec from the recent telemetry downlink, we report further analysis of BAT GRB 240419B (trigger #1223072) (Dichiara, et al., GCN Circ. 36180). The BAT ground-calculated position is RA, Dec = 325.853, 4.299 deg which is RA(J2000) = 21h 43m 24.7s Dec(J2000) = +04d 17' 58.2" with an uncertainty of 3.3 arcmin, (radius, sys+stat, 90% containment). The partial coding was 43%. The BAT light curve shows a complex structure with a duration of ~ 150 sec. T90 (15-350 keV) is 132.16 +- 26.29 sec (estimated error including systematics). The time-averaged spectrum from T-3.3 to T+159.5 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.92 +- 0.09. The fluence in the 15-150 keV band is 4.1 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+116.36 sec in the 15-150 keV band is 2.4 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at https://swift.gsfc.nasa.gov/results/batgrbcat/BAT_refined_circular/1223072