GRB240303A

This page lists all entries on GRB240303A in GRBweb

Summary Swift GCN 35849 GCN 35853 GCN 35854 GCN 35858

Summary table
Variable Value Source
T0 6:33:18 UTC GCN_circulars,Swift Det
ra 229.7375° Swift
decl -57.3633° Swift
pos_error 6.21e-04° Swift
GBM_located False
mjd 60372.273125 GCN_circulars,Swift Det
Swift table
GRB_name GRB240303A
t_trigger 6:33:18 UTC
ra 229.7375°
decl -57.3633°
pos_error 6.21e-04°
GCN 35849 table
GRB_name GRB240303A
GCN_number 35849
Detection_method Swift Det
t_trigger 6:33:18 UTC
ra 229.7480°
decl -57.3750°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35849 SUBJECT: GRB 240303A: Swift detection of a burst DATE: 24/03/03 07:00:31 GMT FROM: Amy A. Y. Lien (U Tampa), V. D'Elia (SSDC & INAF-OAR), A. Melandri (INAF-OAR), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 06:33:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 240303A (trigger=1218452). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 229.748, -57.375 which is RA(J2000) = 15h 19m 00s Dec(J2000) = -57d 22' 30" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the BAT light curve does not show any significant structure. The XRT began observing the field at 06:35:35.6 UT, 136.7 seconds after the BAT trigger. XRT found a bright, uncatalogued X-ray source located at RA, Dec 229.7375, -57.3633 which is equivalent to: RA(J2000) = 15h 18m 57.00s Dec(J2000) = -57d 21' 47.9" with an uncertainty of 4.8 arcseconds (radius, 90% containment). This location is 46 arcseconds from the BAT onboard position, within the BAT error circle. No event data are yet available to determine the column density using X-ray spectroscopy. UVOT took a finding chart exposure of 250 seconds with the U filter starting 143 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. The source location is on the Galactic plane (Glon=321.816 deg, Glat=-0.003 deg). At this moment we are unable to tell if this is a GRB or a galactic transient, which we would name Swift J151857.0-572147. We await further ground data to determine the nature of the source. Burst Advocate for this burst is A. Y. Lien (yarleen AT gmail.com). 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 35853 table
GRB_name GRB240303A
GCN_number 35853
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 35853 SUBJECT: Swift J151857.0-572147: Confirmation of a new galactic transient DATE: 24/03/03 16:29:37 GMT FROM: Jamie Kennea at Penn State J. A. Kennea (PSU), A. Y. Lien (U Tampa) and K. L. Page (U Leicester) report on behalf of the Neil Gehrels Swift Observatory Team: Swift Trigger #1218452 (GCN #35849), previously named GRB 240303A but considered likely to be a galactic transient named Swift J151857.0-572147, has been confirmed to be a transient. Repeated observations of the source show it to be consistently bright, with no signs of fading. This combined with its localization within the Galactic Plane, and the fact that this was a BAT Image trigger, confirms its nature as a Galactic Transient. A spectral fit to the combined Swift/XRT data show an absorption N_H = 5.6 +/- 0.06 x 10^22 cm^-2 and a power-law slope with photon index of 1.78 +/- 0.02. The average flux, corrected for absorption is 1.40 +/- 0.02 x 10^-8 erg/s/cm^2 (0.5-10 keV). We encourage follow-up observations in order to determine the nature of this new transient.
GCN 35854 table
GRB_name GRB240303A
GCN_number 35854
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 35854 SUBJECT: Swift GRB 240303A: Global MASTER-Net observations report DATE: 24/03/03 18:08:32 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-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) was pointed to the Swift GRB 240303A ( A. Y. Lien et al., GCN 35849) errorbox 40932 sec after notice time and 41012 sec after trigger time at 2024-03-03 17:56:51 UT, with upper limit up to 15.7 mag. Observations started at twilight. The observations began at zenith distance = 84 deg. The sun altitude is -10.4 deg. The galactic latitude b = -0 deg., longitude l = 322 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2390165 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 41102 | MASTER-SAAO | C | 180 | 15.7 | 41102 | MASTER-SAAO | C | 180 | 15.2 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 35858 table
GRB_name GRB240303A
GCN_number 35858
Detection_method Swift Det
t_trigger 8:53:10 UTC
ra 229.7320°
decl -57.3540°
Circular_text TITLE: GCN CIRCULAR NUMBER: 35858 SUBJECT: Swift detection of Swift J151857.0-572147 DATE: 24/03/04 09:14:44 GMT FROM: P.A. Evans at U. Leicester E. Ambrosi (INAF-IASFPA), V. D'Elia (SSDC & INAF-OAR), P. A. Evans (U Leicester), J. A. Kennea (PSU), A. Melandri (INAF-OAR), K. L. Page (U Leicester) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 08:53:10 UT, the Swift Burst Alert Telescope (BAT) triggered and located Swift J151857.0-572147 (trigger=1218604). Swift slewed immediately to the object. The BAT on-board calculated location is RA, Dec 229.732, -57.354 which is RA(J2000) = 15h 18m 56s Dec(J2000) = -57d 21' 15" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). As is usual with an image trigger, the BAT light curve does not show any significant structure. The XRT began observing the field at 08:56:20.6 UT, 189.7 seconds after the BAT trigger. XRT found a bright X-ray source located at RA, Dec = 229.7358, -57.3617 which is equivalent to: RA(J2000) = 15h 18m 56.59s Dec(J2000) = -57d 21' 42.1" with an uncertainty of 4.7 arcseconds (radius, 90% containment). This location is 28 arcseconds from the BAT onboard position, within the BAT error circle, and consistent with the localisation of Swift J151857.0-572147 reported in GCN Circs. 35849 & 35853. UVOT took a finding chart exposure of 250 seconds with the U filter starting 195 seconds after the BAT trigger. No credible afterglow candidate has been found in the initial data products. This object is the same as BAT trigger 1218452, which was originally identified as GRB 240303A (Lien et al., GCN Circ. 35849) but later confirmed as a Galactic transient Swift J151857.0-572147 (Kennea et al., GCN Circ. 35853).