//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33328 SUBJECT: GRB 230216A: Swift detection of a burst DATE: 23/02/16 15:05:20 GMT FROM: David Palmer at LANL N. J. Klingler (GSFC/UMBC/CRESSTII), P. A. Evans (U Leicester), R. A. J. Eyles-Ferris (U Leicester), J.D. Gropp (PSU), J. A. Kennea (PSU), F. E. Marshall (NASA/GSFC), K. L. Page (U Leicester), D. M. Palmer (LANL), T. M. Parsotan (GSFC/UMBC/CRESSTII), B. Sbarufatti (INAF-OAB) and M. A. Williams (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 14:48:34 UT, the Swift Burst Alert Telescope (BAT) triggered and located GRB 230216A (trigger=1154815). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 113.966, -8.015 which is RA(J2000) = 07h 35m 52s Dec(J2000) = -08d 00' 53" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed a complex structure with a duration of about 20 sec. The peak count rate was ~700 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 14:50:15.1 UT, 100.3 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 113.95924, -8.01160 which is equivalent to: RA(J2000) = 07h 35m 50.22s Dec(J2000) = -08d 00' 41.8" with an uncertainty of 1.9 arcseconds (radius, 90% containment). This location is 27 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. We cannot determine whether the source is fading at the present time. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 3.17 x 10^21 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 105 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 0.197. The XRT position is 3.8" from the galaxy WISEA J073550.15-080045.2 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/) //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33329 SUBJECT: GRB 230216A: Zadko observatory - Gingin optical observations DATE: 23/02/16 15:54:22 GMT FROM: Bruce Gendre at UVI B. Gendre, E. Moore, F. Panther, D. Coward, J. A. Moore (OzGrav-UWA), A. Klotz (IRAP-CNRS-OMP), and P. Thierry (AGORA), report: We imaged the field of GRB 230216A detected by SWIFT (trigger 1154815, Klingler et al. GCN #33328) with the Zadko robotic telescope (D=100cm) located at the observatory - Gingin, Australia. The observations started 164.1s after the GRB trigger (130.9s after the notice). The elevation of the field decreased from 64 degrees above horizon and weather conditions were good. The field is crowded and the star USNO-B1 0819-0175793 lies within the XRT error box of the possible counterpart, making the analysis complex. However, on a serie of exposures taken between T0+164s and T0+3006s, the PSF of USNO-B1 0819-0175793 increases toward the North axis before returning to a value compatible with the other nearby stars. We would tentatively conclude that the optical afterglow is located behind that star. The coordinates of the afterglow would then be RA = 07h35m50.1s (J2000) DEC = -08d00m42.5s (J2000) At the moment it is impossible to estimate the magnitude of the afterglow; the limiting magnitude of the images is R ~ 19. Further observations are planned. N.B. Galactic coordinates are lon=225.1876 lat= +6.0956 and the galactic extinction in R band is 0.0 magnitudes estimated from D. Schlegel et al. 1998ApJ...500..525S. This message may be cited. ====================================================================== //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33330 SUBJECT: GRB 230216A: AKO Upper Limit DATE: 23/02/16 17:17:11 GMT FROM: Mohammad Odeh at Al Khatim Observatory M44 Mohammad Odeh of Al-Khatim Observatory (AKO) operated by the International Astronomical Center, in Abu Dhabi, UAE. As a follow up for the GRB 230216A detected by Swift (GCN 33328), we observed the field of the GRB with our 0.35m f/7.7 robotic telescope. The observation was done on 16 February 2023 from 16:39:17 to 16:51:39 (UT), 1.8 hours after the GRB trigger. We obtained multiple 180-sec exposures in Ic filter. We did not detect any afterglow within XRT localization. Though, the star USNO-B1 0819-0175793 lies within the XRT error box, which might hide a possible afterglow. This is consistent with the report of (Gendre et al., GCN 33329). The following upper limit was calculated using Atlas catalogue as a reference: ---------------------------------------------------------------------------- - JD (mid), T_mid-T0(hrs), Exposure (sec), Filter, Lim_mag ---------------------------------------------------------------------------- - 2459992.199329, 1.8, 3 x 180 (stacked), Ic, > 19.3 ---------------------------------------------------------------------------- - These magnitudes are not corrected for galactic extinction. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33331 SUBJECT: GRB 230216A: Enhanced Swift-XRT position DATE: 23/02/16 17:54:51 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 1108 s of XRT Photon Counting mode data and 2 UVOT images for GRB 230216A, 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 = 113.95906, -8.01133 which is equivalent to: RA (J2000): 07h 35m 50.17s Dec (J2000): -08d 00' 40.8" with an uncertainty of 2.3 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. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33332 SUBJECT: Swift GRB 230216A: Global MASTER-Net observations report DATE: 23/02/16 18:25:15 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-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 230216A ( N. J. Klingler et al., GCN 33328) errorbox 12295 sec after notice time and 12332 sec after trigger time at 2023-02-16 18:14:07 UT, with upper limit up to 16.9 mag. Observations started at twilight. The observations began at zenith distance = 40 deg. The sun altitude is -10.1 deg. The galactic latitude b = 7 deg., longitude l = 226 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=2199464 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 12423 | MASTER-SAAO | C | 180 | 16.4 | 12423 | MASTER-SAAO | C | 180 | 16.9 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33335 SUBJECT: GRB 230216A: Swift-XRT refined Analysis DATE: 23/02/17 02:22:06 GMT FROM: Phil Evans at U of Leicester E. Ambrosi (INAF-IASFPA) , M. Capalbi (INAF-IASFPA), S. Dichiara (PSU), J.A. Kennea (PSU), A. Tohuvavohu (U. Toronto), J.P. Osborne (U. Leicester), K.L. Page (U. Leicester), A.P. Beardmore (U. Leicester), M. Perri (SSDC & INAF-OAR) and N.J. Klingler report on behalf of the Swift-XRT team: We have analysed 7.3 ks of XRT data for GRB 230216A (Klingler et al. GCN Circ. 33328), from 84 s to 34.1 ks after the BAT trigger. The data comprise 8 s in Windowed Timing (WT) mode (taken while Swift was slewing), with the remainder in Photon Counting (PC) mode. The enhanced XRT position for this burst was given by Osborne et al. (GCN Circ. 33331). The late-time light curve (from T0+4.5 ks) can be modelled with a power-law decay with a decay index of alpha=1.82 (+0.17, -0.15). A spectrum formed from the PC mode data can be fitted with an absorbed power-law with a photon spectral index of 2.00 (+0.19, -0.09). The best-fitting absorption column is consistent with the Galactic value of 3.2 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 3.7 x 10^-11 (5.6 x 10^-11) erg cm^-2 count^-1. A summary of the PC-mode spectrum is thus: Total column: 3.2 (+/-0.7) x 10^21 cm^-2 Galactic foreground: 3.2 x 10^21 cm^-2 Excess significance: <1.6 sigma Photon index: 2.00 (+0.19, -0.09) If the light curve continues to decay with a power-law decay index of 1.82, 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 5.7 x 10^-14 (8.6 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/01154815. This circular is an official product of the Swift-XRT team. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33336 SUBJECT: GRB 230216A: Swift-BAT refined analysis DATE: 23/02/17 19:01:37 GMT FROM: Hans Krimm at NSF/NASA-GSFC M. Stamatikos (OSU), S. D. Barthelmy (GSFC), N. J. Klingler (GSFC/UMBC/CRESSTII) 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), (i.e. the Swift-BAT team): Using the data set from T-240 to T+963 sec from the recent telemetry downlink, we report further analysis of BAT GRB 230216A (trigger #1154815) (Klingler, et al., GCN Circ. 33328). The BAT ground-calculated position is RA, Dec = 113.966, -7.993 deg which is RA(J2000) = 07h 35m 51.9s Dec(J2000) = -07d 59' 36.2" with an uncertainty of 2.1 arcmin, (radius, sys+stat, 90% containment). The partial coding was 85%. The mask-weighted light curve shows a trio of peaks at approximately T-80 sec, T-20 sec and T+0 sec, with some possible substructure and other, smaller peaks. T90 (15-350 keV) is 91.20 +- 7.31 sec (estimated error including systematics). The time-averaged spectrum from T-81.07 to T+16.40 sec is best fit by a simple power-law model. The power law index of the time-averaged spectrum is 1.90 +- 0.23. The fluence in the 15-150 keV band is 1.3 +- 0.2 x 10^-6 erg/cm2. The 1-sec peak photon flux measured from T-0.13 sec in the 15-150 keV band is 1.2 +- 0.3 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/1154815/BA/ Dr. Hans A. Krimm, Program Officer Divisional of Astronomical Sciences National Science Foundation 2415 Eisenhower Avenue, Room W9158 Alexandria, VA 22314 Tel: 703-292-2761 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33340 SUBJECT: GRB 230216A: SVOM/C-GFT optical upper limit DATE: 23/02/18 04:38:35 GMT FROM: Chao Wu at NAOC Zhe Kang (CHO), Liping Xin (NAOC), Chao Wu (NAOC), Xuhui Han (NAOC), Xiaomeng Lu (NAOC), Damien Turpin(CEA), Zhenwei Li (CHO)，Pinpin Zhang (NAOC)，Ruosong Zhang (NAOC)，Yulei Qiu (NAOC)，You Lv (CHO)，Jing Wang(GXU), Cordier Bertrand (CEA) and Jianyan Wei (NAOC) on behalf of SVOM GRB team We observed the burst GRB230216A (Klingler et al. GCN Circ. 33328) on 14:50:01 UT, Feb. 16th, 2023, about 87 seconds after the Swift trigger with C-GFT (Chinese Ground Follow-up Telescope in SVOM mission) in System Test Mode (STM). C-GFT is located at Jilin (long.=126.33 deg, lat.= 43.8243778 deg), Changchun Observatory, National Astronomical Observatories, CAS. It has FOV of 1.5 deg X 1.5 deg with a 4k*4k CMOS detector mounted on the primary focus of 1.2-meter-aperure telescope. A series of g and r band images were obtained. The exposure time was 10-30 seconds for each frame. The bright star USNO-B1 0819-0175793 is located within the XRT enhanced error box (Osborne et al., GCN 33331) which has been reported (Gendre et al.,GCN 33329; Mohammad Odeh GCN 33330). No optical afterglow was detected with an image subtraction by the first r band image with an image obtained 43 minutes after. A limit magnitude of 18.5 mag is derived for r-band single frame (in STM) after calibration with nearby UCAC 4 catalogs. More detailed analysis is continuing. We thank the observation assistant Bowen Li at Jilin observatory for their excellent support. This message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33369 SUBJECT: GRB 230216A: Swift/UVOT Upper Limits DATE: 23/02/22 19:58:25 GMT FROM: Noel Klingler at NASA-GSFC / UMBC N. Klingler (GSFC/UMBC/CRESTII) reports on behalf of the Swift/UVOT team: The Swift/UVOT began settled observations of the field of GRB 230216A 106 s after the BAT trigger (Klingler et al., GCN Circ. 33328). No optical afterglow consistent with the optical position (Gendre et al. GCN Circ. 33329) is detected in the initial UVOT exposures. 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 106 256 147 >16.9 u_FC 264 514 246 >16.9 white 106 1188 353 >16.8 v 594 1065 58 >15.9 b 520 1164 58 >16.5 u 264 1139 304 >16.9 w1 643 1114 58 >17.1 m2 618 1090 58 >17.6 w2 569 1213 78 >17.7 The magnitudes in the table are not corrected for the Galactic extinction due to the reddening of E(B-V) = 0.198 in the direction of the burst (Schlegel et al. 1998). //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 33373 SUBJECT: GRB 230216A Mondy Observations DATE: 23/02/23 23:42:28 GMT FROM: Alexei Pozanenko at IKI, Moscow N. Pankov (HSE), A. Pozanenko (IKI), E. Klunko (ISTP), S. Belkin (IKI) report on behalf of GRB IKI FuN: We observed the field of Swift GRB 220306B (Klingler et al. GCN 33328) with AZT-33IK telescope of Mondy observatory in R-filter on 2023-02-16, 2023-02-18, and 2023-02-20. We detect the optical afterglow of GRB 230216A (Gendre et al. GCN33329) on 2023-02-16 and do not detect on 2023-02-18 and 2023-02-20. Preliminary photometry after subtraction of template image obtained on 2023-02-20 we obtained following results Date UT start t-T0 Exp. Filter OT Err. UL(3sigma) (mid, days) (s) 2023-02-16 15:18:03 0.041319 60*60 R 18.10 0.06 22.1 2023-02-18 13:39:52 1.973123 60*60 R n/d n/d 21.2 The photometry is based on nearby USNO-B1.0 stars. USNO-B1.0 RA Dec R2 113.9612341 -8.0016198 16.61 113.9487699 -8.0038889 16.65 113.9570121 -7.9997820 17.15