GRB240415B

This page lists all entries on GRB240415B in GRBweb

Summary IPN Swift GCN 36125 GCN 36126 GCN 36127 GCN 36226

Summary table
Variable Value Source
T0 3:10:49.351 UTC Swift
ra 132.3170° Swift
decl -27.0700° Swift
pos_error 3.88e-02° Swift
GBM_located False
mjd 60415.13251563657 Swift
IPN table
GRB_name GRB240415B
ra 132.3167°
decl -27.0667°
pos_error 8.33e-02°
Swift table
GRB_name GRB240415B
t_trigger 3:10:49.351 UTC
ra 132.3170°
decl -27.0700°
pos_error 3.88e-02°
GCN 36125 table
GRB_name GRB240415B
GCN_number 36125
Detection_method Swift Other
ra 132.3170°
decl -27.0700°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36125 SUBJECT: GRB 240415B: Swift/BAT-GUANO arcminute localization of a short burst DATE: 24/04/15 22:22:56 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 240415B onboard (T0: 2024-04-15T03:10:49.351 UTC, GECAM trigger 328). The GECAM 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). 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 0.256 s analysis time bin starting at T0 - 0.128 s with a sqrt(TS) of 16.2. An arcminute localization is found with DeltaLLHOut of 26.8 and a DeltaLLHPeak of 9.4. 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 = 132.317, -27.07 deg which is RA(J2000) = 08h 49m 16.0s Dec(J2000) = -27d 04′ 12.0″ with an estimated uncertainty of 5 arcmin radius. 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 36126 table
GRB_name GRB240415B
GCN_number 36126
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 36126 SUBJECT: GRB 240415B: Swift/BAT-GUANO Correction DATE: 24/04/15 22:50:31 GMT FROM: Jimmy DeLaunay at Penn State UVOT and XRT observations have been requested and approved.
GCN 36127 table
GRB_name GRB240415B
GCN_number 36127
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 36127 SUBJECT: GRB 240415B: Swift ToO observations DATE: 24/04/15 23:25:14 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 240415B. Automated analysis of the XRT data will be presented online at https://www.swift.ac.uk/ToO_GRBs/00021683 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 36226 table
GRB_name GRB240415B
GCN_number 36226
Detection_method Swift-XRT Other
ra 132.2001°
decl -27.0714°
Circular_text TITLE: GCN CIRCULAR NUMBER: 36226 SUBJECT: GRB 240415B: Swift-XRT observations DATE: 24/04/22 07:23:17 GMT FROM: Phil Evans at U of Leicester J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), M. Perri (SSDC & INAF-OAR), D.N. Burrows (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-detected burst GRB 240415B, collecting 3.4 ks of Photon Counting (PC) mode data between T0+86.1 ks and T0+115.2 ks. Four uncatalogued X-ray sources have been detected consistent with being within 493 arcsec of the Swift/BAT position, however none of them is above the RASS limit or shows definitive signs of fading. Therefore, at the present time we cannot identify which, if any, is the afterglow. Details of these sources are given below: Source 2: RA (J2000): 132.2001 = 08:48:48.03 Dec (J2000): -27.0714 = -27:04:17.2 Error: 6.4 arcsec (radius, 90% conf.) Count-rate: (9.5 [+10.4, -8.3])e-4 ct s^-1 Distance: 374 arcsec from Swift/BAT position. Source 3: RA (J2000): 132.3176 = 08:49:16.23 Dec (J2000): -27.1553 = -27:09:19.0 Error: 6.6 arcsec (radius, 90% conf.) Count-rate: (2.6 [+1.6, -1.3])e-3 ct s^-1 Distance: 306 arcsec from Swift/BAT position. Flux: (1.32 [+0.83, -0.68])e-12 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 6: RA (J2000): 132.3018 = 08:49:12.44 Dec (J2000): -27.1242 = -27:07:27.0 Error: 5.5 arcsec (radius, 90% conf.) Count-rate: (3.4 [+1.6, -1.3])e-3 ct s^-1 Distance: 200 arcsec from Swift/BAT position. Flux: (4.6 [+2.2, -1.8])e-13 erg cm^-2 s^-1 (observed, 0.3-10 keV) Source 7: RA (J2000): 132.4111 = 08:49:38.66 Dec (J2000): -27.0674 = -27:04:02.8 Error: 5.6 arcsec (radius, 90% conf.) Count-rate: (3.6 [+1.8, -1.5])e-3 ct s^-1 Distance: 301 arcsec from Swift/BAT position. Flux: (8.8 [+4.5, -3.6])e-14 erg cm^-2 s^-1 (observed, 0.3-10 keV) Three uncatalogued sources were also detected too far from the GRB position to be likely afterglow candidates. The results of the XRT-team automatic analysis of the XRT observations, including a position-specific upper limit calculator, are available at https://www.swift.ac.uk/ToO_GRBs/00021684. This circular is an official product of the Swift-XRT team.