GRB230506B

This page lists all entries on GRB230506B in GRBweb

Summary Fermi GBM IPN Swift GCN 33727 GCN 33728 GCN 33729 GCN 33733 GCN 33737 GCN 33740 GCN 33742 GCN 33750 GCN 33758 GCN 33935 GCN 35180

Summary table
Variable Value Source
GRB_name_Fermi GRB230506531
T0 12:45:18 UTC GCN_circulars,Swift Det
ra 326.9817° Swift
decl 44.5111° Swift
pos_error 3.37e-04° Swift
T90 38.4 s Fermi_GBM
T90_error 12.803 s Fermi_GBM
T90_start 12:45:18.768 UTC Fermi_GBM
fluence 6.24e-06 erg/cm² Fermi_GBM
fluence_error 5.86e-08 erg/cm² Fermi_GBM
T100 61.54 s
GBM_located False
mjd 60070.53145833333 GCN_circulars,Swift Det
Fermi GBM table
GRB_name_Fermi GRB230506531
trigger_name bn230506531
ra 326.9929°
decl 44.5400°
pos_error 4.82e+00°
datum 2023-05-06
t_trigger 12:45:18.768 UTC
T90 38.4 s
T90_error 12.803 s
T90_start 12:45:18.768 UTC
fluence 6.24e-06 erg/cm²
fluence_error 5.86e-08 erg/cm²
flux_1024 8.15e+00 erg/cm²/s
flux_1024_error 2.87e-01 erg/cm²/s
flux_1024_time 1.04e+01 erg/cm²/s
flux_64 2.20e+01 erg/cm²/s
flux_64_error 1.54e+00 erg/cm²/s
IPN table
GRB_name GRB230506B
ra 326.9917°
decl 44.5333°
pos_error 5.00e-02°
Swift table
GRB_name GRB230506B
t_trigger 12:45:18 UTC
ra 326.9817°
decl 44.5111°
pos_error 3.37e-04°
T90 61.54 s
fluence 2.90e-06 erg/cm²
GCN 33727 table
GRB_name GRB230506B
GCN_number 33727
Detection_method Swift Det
t_trigger 12:45:18 UTC
ra 326.9930°
decl 44.5400°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33727 SUBJECT: GRB 230506B: Swift detection of a burst DATE: 23/05/06 13:28:17 GMT FROM: K.L. Page at U Leicester S. Dichiara (PSU), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (U Tampa), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 12:45:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230506B (trigger=1167266). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 326.993, +44.540 which is RA(J2000) = 21h 47m 58.32s Dec(J2000) = +44d 32' 24.00" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). No BAT light-curve is available at this time. The XRT began observing the field at 12:47:12 UT, 114 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 326.97876, 44.51108 which is equivalent to: RA(J2000) = 21h 47m 54.90s Dec(J2000) = +44d 30' 39.9" with an uncertainty of 6 arcseconds (radius, 90% containment). This location is 110 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. UVOT prompt data are not available at this time. We are waiting for the full dataset to search for an UVOT counterpart. Due to a communications issue, no realtime alerts were received for this GRB. Therefore, results in this GCN are based on rapidly reported results, and will be refined in a future GCN Circular. 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 33728 table
GRB_name GRB230506B
GCN_number 33728
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 33728 SUBJECT: GRB 230506B: MASTER optical observations DATE: 23/05/06 15:27:59 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V.Lipunov, P.Balanutsa, A.Kuznetsov, N.Tiurina, O.Gress, E.Gorbovskoy, G.Antipov,K.Zhirkov, D.Vlasenko, Ya.Kechin, A.Chasovnikov,V.Senik, V.Topolev, Yu.Tselik, Siyu Wu, V.Vladimirov, D.Cheryasov (Lomonosov Moscow State University, SAI,Physics Department), C.Francile, F. Podesta, C.Lopez, R. Podesta (Observatorio Astronomico Felix Aguilar OAFA), D.A.H.Buckley (SAAO), R. Rebolo, M. Serra (The Instituto de Astrofisica de Canarias), L.Carrasco, J.R.Valdes, V.Chavushyan, V.M.Patino Alvarez, J.Martinez, A.Corella,L.H.Rodriguez (INAOE, Guillermo Haro Astrophysics Observatory), N.M.Budnev, O.Ershova (ISU,API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), A. Gabovich, V.Yurkov (Blagoveschensk Educational State University), K.Vetrov, V.Shumkov, T.Pogrosheva, E.Minkina, O.Ershova (Lomonosov MSU) 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 GRB230506.53 (trigger No 1167266,21h 47m 54.90s , +44d 30m 39.9s, R=0.1) errorbox 6276 sec after trigger time at 2023-05-06 14:29:54 UT, so as alert didn't come from GCN socket system. The observations began at zenith distance = 72 deg. The sun altitude is -22.3 deg.The galactic latitude b = -7 deg., longitude l = 92 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2214809 We obtained following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 6367 | MASTER-Amur | C | 180 | 16.8 | 6567 | MASTER-Amur | C | 180 | 17.2 | 6767 | MASTER-Amur | C | 180 | 17.3 | 7037 | MASTER-Amur | C | 720 | 18.0 | Coadd 6966 | MASTER-Amur | C | 180 | 17.3 | 7166 | MASTER-Amur | C | 180 | 17.4 | 7366 | MASTER-Amur | C | 180 | 17.4 | Filter C is a clear (unfiltred) band. Observations and analysis will be continued. The message may be cited.
GCN 33729 table
GRB_name GRB230506B
GCN_number 33729
Detection_method Swift Det
t_trigger 12:45:18 UTC
ra 326.9930°
decl 44.5400°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33729 SUBJECT: GRB 230506B: Swift detection of a burst DATE: 23/05/06 15:35:28 GMT FROM: K.L. Page at U Leicester S. Dichiara (PSU), C. Gronwall (PSU), J. A. Kennea (PSU), A. Y. Lien (U Tampa), K. L. Page (U Leicester), B. Sbarufatti (INAF-OAB) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 12:45:18 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230506B (trigger=1167266). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 326.993, +44.540 which is RA(J2000) = 21h 47m 58.32s Dec(J2000) = +44d 32' 24.00" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). No BAT light-curve is available at this time. The XRT began observing the field at 12:47:12 UT, 114 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 326.97876, 44.51108 which is equivalent to: RA(J2000) = 21h 47m 54.90s Dec(J2000) = +44d 30' 39.9" with an uncertainty of 6 arcseconds (radius, 90% containment). This location is 110 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. UVOT prompt data are not available at this time. We are waiting for the full dataset to search for an UVOT counterpart. Due to a communications issue, no realtime alerts were received for this GRB. Therefore, results in this GCN are based on rapidly reported results, and will be refined in a future GCN Circular. 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 33733 table
GRB_name GRB230506B
GCN_number 33733
Detection_method Swift-UVOT Det
Circular_text TITLE: GCN CIRCULAR NUMBER: 33733 SUBJECT: GRB 230506B: Swift/UVOT Detection DATE: 23/05/06 21:37:07 GMT FROM: Paul Kuin at MSSL Paul Kuin (MSSL/UCL) and Simone Dichiara(PSU) report on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 230506B 114 s after the BAT trigger (Dichiara et al., GCN Circ. 33727). A candidate afterglow consistent with the XRT position 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 113 271 147 20.19 +/- 0.24 white 614 807 38 >19.8 u 334 583 247 >19.9 u 10511 11899 738 20.66 +/- 0.30 b 589 783 39 >19.1 uvw1 714 734 20 >17.6 uvm2 688 708 20 >17.2 uvw2 639 658 20 >19.6 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.293 in the direction of the burst (Schlegel et al. 1998). [GCN OPS NOTE: Corrected title from 230606B to 230506B at author's request.]
GCN 33737 table
GRB_name GRB230506B
GCN_number 33737
Detection_method Swift-XRT Other
ra 326.9817°
decl 44.5111°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33737 SUBJECT: GRB 230506B: Swift-XRT refined Analysis DATE: 23/05/07 05:44:37 GMT FROM: Phil Evans at U of Leicester D.N. Burrows (PSU), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), P.A. Evans (U. Leicester), V. D'Elia (SSDC & INAF-OAR), B. Sbarufatti (INAF-OAB), A. D'Ai (INAF-IASFPA), J. D. Gropp (PSU), S. Dichiara (PSU) report on behalf of the Swift-XRT team: We have analysed 7.9 ks of XRT data for GRB 230506B, from 68 s to 50.9 ks after the BAT trigger. The data comprise 124 s in Windowed Timing (WT) mode (the first 9 s were taken while Swift was slewing) with the remainder in Photon Counting (PC) mode. Using 335 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 = 326.98168, +44.51111 which is equivalent to: RA (J2000): 21h 47m 55.60s Dec(J2000): +44d 30' 40.0" with an uncertainty of 2.6 arcsec (radius, 90% confidence). The light curve can be modelled with an initial power-law decay with an index of alpha=1.83 (+0.16, -0.17), followed by a break at T+146 s to an alpha of 4.87 (+0.29, -0.24). A spectrum formed from the WT mode data can be fitted with an absorbed power-law with a photon spectral index of 1.45 (+/-0.13). The best-fitting absorption column is 5.8 (+1.3, -1.1) x 10^21 cm^-2, in excess of the Galactic value of 3.8 x 10^21 cm^-2 (Willingale et al. 2013). The counts to observed (unabsorbed) 0.3-10 keV flux conversion factor deduced from this spectrum is 5.6 x 10^-11 (7.1 x 10^-11) erg cm^-2 count^-1. A summary of the WT-mode spectrum is thus: Total column: 5.8 (+1.3, -1.1) x 10^21 cm^-2 Galactic foreground: 3.8 x 10^21 cm^-2 Excess significance: 3.0 sigma Photon index: 1.45 (+/-0.13) If the light curve continues to decay with a power-law decay index of 4.87, the count rate at T+24 hours will be 5.0 x 10^-13 count s^-1, corresponding to an observed (unabsorbed) 0.3-10 keV flux of 2.8 x 10^-23 (3.6 x 10^-23) erg cm^-2 s^-1. The results of the XRT-team automatic analysis are available at http://www.swift.ac.uk/xrt_products/01167266. This circular is an official product of the Swift-XRT team.
GCN 33740 table
GRB_name GRB230506B
GCN_number 33740
Detection_method Swift-XRT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33740 SUBJECT: GRB 230506B: LCOGT Optical Upper Limits DATE: 23/05/07 15:34:37 GMT FROM: Robert Strausbaugh at University of Minnesota R. Strausbaugh (University of Minnesota), A. Cucchiara (NASA) report on behalf of a larger collaboration: We observed the GRB 230506B (Dichiara et al., GCN 33727) field with the LCOGT 1-meter Sinistro instrument at the Teide Observatory, Tenerife site, on May 7, from 04:09 to 04:41 UT (corresponding to 15.43 to 15.93 hours from the GRB trigger time) with the SDSS r and i filters. We performed a series of 3x300s exposures in each band. We do not detect an uncatalouged source within the Swift-XRT error region in either band. The following upper limits are calculated using the PanSTARRS catalog as reference: r > 22.3 i > 21.8 These magnitudes are not corrected for galactic extinction.
GCN 33742 table
GRB_name GRB230506B
GCN_number 33742
Detection_method Swift-BAT Det
ra 326.9860°
decl 44.5140°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33742 SUBJECT: GRB 230506B: Swift-BAT refined analysis DATE: 23/05/07 18:41:10 GMT FROM: Amy Lien at GSFC S. D. Barthelmy (GSFC), S. Dichiara (PSU), 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 230506B (trigger #1167266) (Dichiara et al., GCN Circ. 33727). The BAT ground-calculated position is RA, Dec = 326.986, 44.514 deg which is RA(J2000) = 21h 47m 56.6s Dec(J2000) = +44d 30' 50.9" with an uncertainty of 1.2 arcmin, (radius, sys+stat, 90% containment). The partial coding was 73%. The mask-weighted light curve shows a multi-peaked structure that starts at ~T0 and ends at ~T+80 s. The main peak occurs at ~T+11 s. T90 (15-350 keV) is 61.54 +- 10.89 sec (estimated error including systematics). The time-averaged spectrum from T+0.02 to T+76.30 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.41 +- 0.11. The fluence in the 15-150 keV band is 2.9 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T+10.60 sec in the 15-150 keV band is 4.6 +- 0.4 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/1167266/BA/
GCN 33750 table
GRB_name GRB230506B
GCN_number 33750
Detection_method Swift-UVOT Other
Circular_text TITLE: GCN CIRCULAR NUMBER: 33750 SUBJECT: GRB 230506B: Swift/UVOT further analysis DATE: 23/05/10 07:58:44 GMT FROM: Paul Kuin at MSSL Paul Kuin (MSSL/UCL) reports on behalf of the Swift/UVOT team: The XRT position of GRB230506B falls on a Gaia DR3 source of magnitude BP = 19.89, Gmag = 19.34. We see from further analysis of the UVOT data that within errors the detections are consistent with the Gaia source. The UVOT data are therefore not the optical afterglow of the GRB.
GCN 33758 table
GRB_name GRB230506B
GCN_number 33758
Detection_method Fermi GBM Det
t_trigger 12:45:18.770 UTC
Circular_text TITLE: GCN CIRCULAR NUMBER: 33758 SUBJECT: GRB 230506B: Fermi GBM detection DATE: 23/05/10 21:19:49 GMT FROM: Oliver J Roberts at USRA/NASA O.J. Roberts (USRA/NASA-MSFC), S. Bala (USRA), C. Meegan (UAH) report on behalf of the Fermi GBM Team: "At 12:45:18.77 UT on 06 May 2023, the Fermi Gamma-Ray Burst Monitor (GBM) triggered and located GRB 230506B (trigger 705069923 / 230506531), which was also detected by the Swift/BAT (S. Dichiara et al. 2023, GCN 33729 and S.D. Barthelmy et al. 2023, GCN 33742). The GBM on-ground location is consistent with the Swift position. The angle from the Fermi LAT boresight at the GBM trigger time is 47 degrees. The GBM light curve consists of multiple short bursts with a duration (T90) of about 38 s (50-300 keV). The time-averaged spectrum from T0-0.8 s to T0+39.2 s is best fit by a power law function with an exponential high-energy cutoff. The power law index is -1.28 +/- 0.04 and the cutoff energy, parameterized as Epeak, is 1767 +/- 576 keV The event fluence (10-1000 keV) in this time interval is (1.13 +/- 0.04)E-05 erg/cm^2. The 1-sec peak photon flux measured starting from T0+10.4 s in the 10-1000 keV band is 8.1 +/- 0.3 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 33935 table
GRB_name GRB230506B
GCN_number 33935
Detection_method Other
ra 326.9817°
decl 44.5116°
Circular_text TITLE: GCN CIRCULAR NUMBER: 33935 SUBJECT: GRB 230506B: Chandra localization of the X-ray afterglow DATE: 23/06/07 19:35:15 GMT FROM: Brendan O'Connor at UMD B. O'Connor (GWU), S. Dichiara (PSU), E. Troja (UTV), S. B. Cenko (NASA-GSFC, UMD), C. Kouveliotou (GWU), T. Sakamoto (AGU), A. Kutyrev (UMD), G. Ryan (Perimeter), R. Ricci (INAF), G. Bruni (INAF): We carried out two Chandra ToO observation of GRB 230506B beginning on May 11, 2023 at 06:59:55 UT and June 01, 2023 at 19:31:19 UT with ACIS-S as part of program 24400201 (PI: O'Connor) for a total of 19 ks and 55 ks, respectively. The initial observation began ~4.8 days after the GRB trigger (Dichiara et al. GCN 33727). Within the XRT localization (Burrows et al. GCN 33737), we detect a single point source at RA, DEC = 21:47:55.6, 44:30:41.6 with an uncertainty of 0.9" (90% confidence, statistical + systematic). The source displays rapid fading between the two Chandra epochs confirming that it is the X-ray afterglow of GRB 230506B. We would like to thank Patrick Slane, Harvey Tananbaum, Dan Schwartz, Scott Wolk, and the CXO staff for rapidly approving and planning this observation.
GCN 35180 table
GRB_name GRB230506B
GCN_number 35180
Detection_method Optical
Circular_text TITLE: GCN CIRCULAR NUMBER: 35180 SUBJECT: GRB230506B: VIRT optical upper limit DATE: 23/11/24 20:33:20 GMT FROM: Priya Gokuldass at ERAU K. Noonan (UVI), P. Gokuldass (ERAU), N. Orange (OrangeWave Innovative Science, LLC), D. Morris (NASA), K. Smith (UVI), R. Querrard (UVI), T. Lombardi (Eckerd College) We observed the field of GRB230506B (Dichiara et al. GCN 33727) with the 0.5m Virgin Island Robotic Telescope (VIRT) at the University of the Virgin Islands' Etelman Observatory on 05-07-2023 starting at 05:20:40.065 (T+16.33 hrs). We performed a series of exposures in R filter with a total exposure of 3860 s. The weather conditions were clear during the hours of observation with an average airmass of ~2.6. We do not detect an uncatalogued source within the Swift-XRT error region and report the following 3-sigma upper limit: T_mid ||Exposure ||Filter ||Limit T+17 hrs ||3860s ||R ||>20.1 The limit is estimated from comparison to nearby USNO B1 stars and is not corrected for Galactic extinction. The VIRT is still in the commissioning phase. We acknowledge financial support from NASA MUREP MIRO award 80NSSC21M0001, NASA EPSCoR award 80NSSC22M0063, and NSF EiR award 1901296. R.Q. and N.B.O. also acknowledge financial support from South Carolina Space Grant award 80NSSC20M0054. This message can be cited.