GRB230802A

This page lists all entries on GRB230802A in GRBweb

Summary Fermi GBM IPN Swift GCN 34313 GCN 34317 GCN 34318 GCN 34320 GCN 34321 GCN 34329 GCN 34333 GCN 34334

Summary table
Variable Value Source
GRB_name_Fermi GRB230802285
T0 6:50:09.429 UTC Fermi_GBM
ra 76.2398° Swift
decl 19.5607° Swift
pos_error 2.46e-04° Swift
T90 38.145 s Fermi_GBM
T90_error 1.717 s Fermi_GBM
T90_start 6:50:09.429 UTC Fermi_GBM
fluence 1.28e-05 erg/cm² Fermi_GBM
fluence_error 1.80e-07 erg/cm² Fermi_GBM
T100 192.191 s
GBM_located False
mjd 60158.28483135417 Fermi_GBM
Fermi GBM table
GRB_name_Fermi GRB230802285
trigger_name bn230802285
ra 76.2208°
decl 19.5700°
datum 2023-08-02
t_trigger 6:50:22.229 UTC
T90 38.145 s
T90_error 1.717 s
T90_start 6:50:09.429 UTC
fluence 1.28e-05 erg/cm²
fluence_error 1.80e-07 erg/cm²
flux_1024 5.56e+00 erg/cm²/s
flux_1024_error 4.42e-01 erg/cm²/s
flux_1024_time 4.35e+00 erg/cm²/s
flux_64 9.37e+00 erg/cm²/s
flux_64_error 1.94e+00 erg/cm²/s
IPN table
GRB_name GRB230802A
ra 76.2208°
decl 19.5667°
pos_error 5.00e-02°
Swift table
GRB_name GRB230802A
t_trigger 6:50:26 UTC
ra 76.2398°
decl 19.5607°
pos_error 2.46e-04°
T90 175.62 s
fluence 5.00e-06 erg/cm²
GCN 34313 table
GRB_name GRB230802A
GCN_number 34313
Detection_method Swift Det
t_trigger 6:50:26 UTC
ra 76.2210°
decl 19.5700°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34313 SUBJECT: GRB 230802A: Swift detection of a burst DATE: 23/08/02 07:08:39 GMT FROM: K.L. Page at U Leicester N. J. Klingler (GSFC/UMBC/CRESSTII), V. D'Elia (SSDC & INAF-OAR), P. A. Evans (U Leicester), J. A. Kennea (PSU), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), A. Melandri (INAF-OAR), K. L. Page (U Leicester), D. M. Palmer (LANL) and M. H. Siegel (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 06:50:26 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230802A (trigger=1182085). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 76.221, +19.570 which is RA(J2000) = 05h 04m 53s Dec(J2000) = +19d 34' 10" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a wide pulse structure with a duration of about 60 sec. The peak count rate was ~3000 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 06:51:30.3 UT, 64.1 seconds after the BAT trigger. Using promptly downlinked data we find a bright, fading, uncatalogued X-ray source located at RA, Dec 76.23952, 19.56147 which is equivalent to: RA(J2000) = 05h 04m 57.48s Dec(J2000) = +19d 33' 41.3" with an uncertainty of 3.5 arcseconds (radius, 90% containment). This location is 69 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. No spectrum from the promptly downlinked event data is yet available to determine the column density. The initial flux in the 2.5 s image was 1.25e-09 erg cm^-2 s^-1 (0.2-10 keV). UVOT took a finding chart exposure of 150 seconds with the White filter starting 73 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 0.614. Burst Advocate for this burst is N. J. Klingler (noelklin AT umbc.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 34317 table
GRB_name GRB230802A
GCN_number 34317
Detection_method Swift-XRT Det
ra 76.2399°
decl 19.5607°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34317 SUBJECT: GRB 230802A: Enhanced Swift-XRT position DATE: 23/08/02 20:19:42 GMT FROM: Phil Evans at U of Leicester M.R. Goad, J.P. Osborne, A.P. Beardmore and P.A. Evans (U. Leicester) report on behalf of the Swift-XRT team. Using 1180 s of XRT Photon Counting mode data and 1 UVOT images for GRB 230802A, 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 = 76.23985, +19.56066 which is equivalent to: RA (J2000): 05h 04m 57.56s Dec (J2000): +19d 33' 38.4" with an uncertainty of 2.0 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 34318 table
GRB_name GRB230802A
GCN_number 34318
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34318 SUBJECT: GRB 230802A: Swift-XRT refined Analysis DATE: 23/08/02 20:28:29 GMT FROM: Phil Evans at U of Leicester A.P. Beardmore (U. Leicester), B. Sbarufatti (INAF-OAB), A. D'Ai (INAF-IASFPA), A. Melandri (INAF-OAR), J. D. Gropp (PSU), S. Dichiara (PSU), J.A. Kennea (PSU), J.P. Osborne (U. Leicester) and P.A. Evans report on behalf of the Swift-XRT team: We have analysed 7.9 ks of XRT data for GRB 230802A, from 52 s to 40.1 ks after the BAT trigger. The data comprise 386 s in Windowed Timing (WT) mode (the first 10 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. The light curve can be modelled with a series of power-law decays. The initial decay index is alpha=0.4 (+/-0.4). At T+345 s the decay steepens to an alpha of 2.5 (+0.4, -0.3) before breaking again at T+1364 s to a final decay with index alpha=1.26 (+0.16, -0.30). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.02 (+/-0.04). The best-fitting absorption column is 6.5 (+/-0.5) x 10^21 cm^-2, in excess of the Galactic value of 3.4 x 10^21 cm^-2 (Willingale et al. 2013). The PC mode spectrum has a photon index of 1.66 (+0.22, -0.21) and a best-fitting absorption column of 4.5 (+1.5, -1.1) x 10^21 cm^-2. The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 4.9 x 10^-11 (6.5 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 4.5 (+1.5, -1.1) x 10^21 cm^-2 Galactic foreground: 3.4 x 10^21 cm^-2 Excess significance: <1.6 sigma Photon index: 1.66 (+0.22, -0.21) If the light curve continues to decay with a power-law decay index of 1.26, the count rate at T+24 hours will be 1.5 x 10^-3 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 7.2 x 10^-14 (9.7 x 10^-14) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01182085. This circular is an official product of the Swift-XRT team.
GCN 34320 table
GRB_name GRB230802A
GCN_number 34320
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 34320 SUBJECT: GRB 230802A: BOOTES-5/JGT optical upper limit DATE: 23/08/02 21:00:30 GMT FROM: Youdong HU at IAA-CSIC E. Fernandez-Garcia, Y.-D. Hu, A. J. Castro-Tirado, I. Perez-Garcia, M.D. Caballero-Garcia, R. Sanchez-Ramirez, S. Guziy (IAA-CSIC), D. Hiriart and W. H. Lee (UNAM), C. J. Perez del Pulgar (UMA) and I. M. Carrasco-Garcia (SMA) and I. H. Park (SKKU), on behalf of a larger collaboration, report: Following the detection of GRB 230802A by Swift (Klingler et al. GCNC 34313), the BOOTES-5/JGT 0.6m robotic telescope at Observatorio Astronomico Nacional in San Pedro Martir (Mexico) automatically observed the GRB location starting on Aug. 02, 11:41 UT (~ 4.9 h after trigger). No new optical source is detected on the co-added image (13 x 60 s, clear filter) within the enhanced Swift/XRT error region (Goad et al. GCNC 34317) down to 19.7 mag, which is consistent with the limit reported by UVOT (Klingler et al. GCNC 34313). We thank the staff at Observatorio Astronomico Nacional in San Pedro Martir for their excellent support.
GCN 34321 table
GRB_name GRB230802A
GCN_number 34321
Detection_method Swift Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34321 SUBJECT: Swift GRB 230802A: Global MASTER-Net observations report DATE: 23/08/03 01:19:09 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, V.Kornilov, E.Gorbovskoy, K.Zhirkov, N.Tyurina, P.Balanutsa, A.Kuznetsov, D. Vlasenko, G.Antipov, D.Zimnukhov, V.Senik, E.Minkina, A.Chasovnikov, V.Topolev, D.Kuvshinov, D.Cheryasov, Ya.Kechin (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. Gres, N.M. Budnev (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), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University) MASTER-Tavrida robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Russia (Lomonosov MSU, SAI Crimea astronomical station) was pointed to the Swift GRB 230802A ( N. J. Klingler et al., GCN 34313) errorbox 65651 sec after notice time and 65669 sec after trigger time at 2023-08-03 01:04:55 UT, with upper limit up to 15.3 mag. Observations started at twilight. The observations began at zenith distance = 65 deg. The sun altitude is -13.8 deg. The galactic latitude b = -12 deg., longitude l = 183 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2248891 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 65759 | MASTER-Tavrida | C | 180 | 15.3 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited.
GCN 34329 table
GRB_name GRB230802A
GCN_number 34329
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 34329 SUBJECT: GRB 230802A: Swift/UVOT Upper Limits DATE: 23/08/03 13:59:26 GMT FROM: Sam LaPorte at PSU GRB 230802A: Swift/UVOT Upper Limits S. J. LaPorte (PSU) and N. J. Klingler (GSFC/UMBC/CRESSTII) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 230802A 73 s after the BAT trigger (Klingler et al., GCN Circ. 34313). No optical afterglow consistent with the XRT position (Evans et al., GCN Circ. 34317) 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) exposure and subsequent exposures are: Filter T_start(s) T_stop(s) Exp(s) Mag white_FC 73 223 147 >20.0 u_FC 286 535 246 >19.5 white 73 1186 353 >20.5 v 615 1581 117 >18.4 b 541 1506 97 >19.2 u 286 5048 492 >19.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.614 in the direction of the burst (Schlegel et al. 1998).
GCN 34333 table
GRB_name GRB230802A
GCN_number 34333
Detection_method Swift-BAT Det
ra 76.2320°
decl 19.5520°
Circular_text TITLE: GCN CIRCULAR NUMBER: 34333 SUBJECT: GRB 230802A: Swift-BAT refined analysis DATE: 23/08/04 14:09:21 GMT FROM: Sibasish Laha at NASA-GSFC S. D. Barthelmy (GSFC), H. A. Krimm (NSF), S. Laha (GSFC/UMBC), A. Y. Lien (U Tampa), C. B. Markwardt (GSFC),D. M. Palmer (LANL), T. Parsotan (GSFC/UMBC),T. Sakamoto (AGU), M. Stamatikos (OSU) (i.e. the Swift-BAT team): Using the data set from T-240 to T+962 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230802A (trigger #1182085) (Klingler et al., GCN Circ. 34313). The BAT ground-calculated position is RA, Dec = 76.232, 19.552 deg which is RA(J2000) = 05h 04m 55.6s Dec(J2000) = +19d 33' 06.3" with an uncertainty of 1.0 arcmin, (radius, sys+stat, 90% containment). The partial coding was 99%. The BAT light curve shows a complex structure with a duration of ~ 200 sec. T90 (15-350 keV) is 175.62 +- 18.26 sec (estimated error including systematics). The time-averaged spectrum from T-6.04 to T+230.70 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.60 +- 0.07. The fluence in the 15-150 keV band is 5.0 +- 0.2 x 10^-06 erg/cm2. The 1-sec peak photon flux measured from T+0.60 sec in the 15-150 keV band is 2.3 +- 0.2 ph/cm2/sec. All the quoted errors are at the 90% confidence level. The results of the batgrbproduct analysis are available at http://gcn.gsfc.nasa.gov/notices_s/1182085/BA/
GCN 34334 table
GRB_name GRB230802A
GCN_number 34334
Detection_method Fermi GBM Det
t_trigger 6:50:22.230 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 34334 SUBJECT: GRB 230802A: Fermi GBM observation DATE: 23/08/04 15:39:21 GMT FROM: Joe Mangan at IJCLab C. de Barra (UCD), J.Mangan (CNRS/IJCLab) and C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 06:50:22.23 UT on 2 August 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 230802A (trigger 712651827 / 230802285), which was also detected by Swift BAT (N. J. Klingler et al. 2023, GCN 34313). The Fermi GBM on-ground location is consistent with the Swift BAT position. The angle from the Fermi LAT boresight at the GBM trigger time is 107 degrees. The GBM light curve consists of a single peak with a duration (T90) of about 38 s (50-300 keV)The time-averaged spectrum from -14.3s to 26.6 s is best fit by a simple power law function with index -1.7 +/- 0.02. The event fluence (10-1000 keV) in this time interval is (1.3 +/- 0.1)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+4.4 s in the 10-1000 keV band is 5.6 +/- 0.4 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/"