//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28594 SUBJECT: Swift detection of a new SGR 1830-0645 or a short GRB 201010A DATE: 20/10/10 15:16:16 GMT FROM: Scott Barthelmy at NASA/GSFC K. L. Page (U Leicester), S. D. Barthelmy (GSFC), N. J. Klingler (PSU), N. P. M. Kuin (UCL-MSSL) and A. Y. Lien (GSFC/UMBC) report on behalf of the Neil Gehrels Swift Observatory Team: At 14:49:24 UT, the Swift Burst Alert Telescope (BAT) triggered and located SGR 1830-0645 or GRB 201010A (trigger=999571). Swift slewed immediately to the burst. The BAT on-board calculated location is RA, Dec 277.675, -6.758, which is RA(J2000) = 18h 30m 42s Dec(J2000) = -06d 45' 30" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve shows a single peak structure with a duration of no more than 0.128 sec. The peak count rate was ~1600 counts/sec (15-350 keV), at ~0 sec after the trigger. The XRT began observing the field at 14:50:30.9 UT, 67.0 seconds after the BAT trigger. Using promptly downlinked data we find an uncatalogued X-ray source with an enhanced position: RA, Dec 277.6702, -6.7550 which is equivalent to: RA(J2000) = 18h 30m 40.85s Dec(J2000) = -06d 45' 18.0" with an uncertainty of 2.2 arcseconds (radius, 90% containment). This location is 20 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. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 1.11 x 10^22 cm^-2 (Willingale et al. 2013). UVOT took a finding chart exposure of 150 seconds with the White filter starting 71 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. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the sub-image. The 8'x8' region for the list of sources generated on-board covers 100% of the XRT error circle. Because of the density of catalogued stars, further analysis is required to report an upper limit for any afterglow in the region. No correction has been made for the large, but uncertain, extinction expected. Due to its short duration (BAT trigger duration of 8 ms, although the immediately available lightcurve is only available at 128 ms resolution), the soft spectrum (not visible above 50 keV) and its location in the Galactic bulge near the plane (lon,lat) = (24.5, 1.5) we suspect that this event may be a new Soft Gamma Repeater, which we would name SGR 1830-0645. Burst Advocate for this burst is K. L. Page (klp5 AT leicester.ac.uk). 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: 28595 SUBJECT: Swift GRB201010.62: Global MASTER-Net observations report DATE: 20/10/10 18:06:09 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, N.Tyurina, P.Balanutsa, A.Kuznetsov, F.Balakin, V.Vladimirov, D. Vlasenko, I.Gorbunov, D.Zimnukhov, V.Senik, T.Pogrosheva, D.Kuvshinov, D. Cheryasov (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, O.Ershova (Irkutsk State University, API), A. Tlatov, D. Dormidontov (Kislovodsk Solar Station of the Pulkovo Observatory), V. Yurkov, A. Gabovich, Yu. Sergienko (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 GRB201010.62 (trigger No 999571,18h 30m 42.00s , -06d 45m 28.8s, R=0.05) errorbox 11339 sec after notice time and 11364 sec after trigger time at 2020-10-10 17:58:48 UT, with upper limit up to 16.6 mag. The observations began at zenith distance = 66 deg. The sun altitude is -31.1 deg. The galactic latitude b = 1 deg., longitude l = 25 deg. Real time updated cover map and OT discovered available here: https://master.sai.msu.ru/site/master2/observ.php?id=1459250 We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 11454 | MASTER-Tavrida | C | 180 | 16.6 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28596 SUBJECT: GRB 201010A: Enhanced Swift-XRT position DATE: 20/10/10 20:59:12 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 2915 s of XRT Photon Counting mode data and 5 UVOT images for GRB 201010A, 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 = 277.67385, -6.75455 which is equivalent to: RA (J2000): 18h 30m 41.72s Dec (J2000): -06d 45' 16.4" with an uncertainty of 1.4 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: 28597 SUBJECT: SGR 1830-0645 / GRB 201010A: Kitab optical non-detection DATE: 20/10/11 12:42:25 GMT FROM: Alexei Pozanenko at IKI, Moscow S. Belkin (IKI), A. Pozanenko (IKI), A. Zhornichenko (KIAM), N. Pankov (HSE), A. Novichonok (Petrozavodsk State University, KIAM), Sh. Ehgamberdiev (UBAI) report on behalf of IKI-GRB-FuN: We observed the field of new SGR 1830-0645 (Page et al., GCN 28594; Gogus et al., ATEL 14085) originally detected by Swift (trigger=999571) and also named as GRB 201010A with Kitab-ISON RC-36 telescope in R-filter. Observation started on Oct. 10 (UT) 15:21:08, i.e. 31.7 minutes after trigger. The field is extremely crowded. Within enhanced XRT position (Osborne et al., GCN 28596) we found a source which is also presented in the DSS2 (R) image but not listed in USNO-B1.0. In our images we cannot discriminate the sources. We performed aperture photometry which include this source and nearby Northern source listed in USNO-B1.0 0832-0432584 (R2=13.54) in two stacked images. The image A is at midpoint 0.02343 days and the image (B) is at midpoint 0.03835 days after trigger. By comparison of the two photometric results (A) R=14.16 +/- 0.06 and (B) R=14.20 +/- 0.07 we do not observe any variability and hence we do not detect optical activity of SGR 1830-0645. Formal photometry of the field in both epochs (A,B) is following Date, UT start, t-T0, Exp., Filter, OT, Err., UL (mid, days) (A)2020-10-10 15:21:08 0.02343 240 R n/d n/d 17.0 (B)2020-10-10 15:21:08 0.03835 2480 R n/d n/d 18.0 The photometry is based on nearby USNO-B1.0 star, R2 magnitude USNO_B10_id R2 0832-0432530 15.34 0832-0433055 13.04 //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 28601 SUBJECT: SGR 1830-0645 / GRB 201010A: 1.5m OSN optical upper limit DATE: 20/10/11 19:35:27 GMT FROM: Youdong HU at IAA-CSIC Y.-D. Hu, A. Sota, A. J. Castro-Tirado, E. Fernandez-Garcia (IAA-CSIC), C. Perez del Pulgar, A. Castellon, I. Carrasco (Univ. de Malaga) on behalf of a larger collaboration, report: Following the detection of SGR 1830-0645/GRB201010A by Swift (Page et al. GCNC 28594), optical images in the I-band were obtained at the 1.5m OSN telescope in Granada (Spain) starting at 20:35 (Oct 10), i.e. ~5.8 h postburst. No optical afterglow is detected in the image within the enhanced Swift/XRT error box (Osborne et al. GCNC 28596) down to I=20.1, which is in agreement with the non-detections reported by Lipunov et al. (GCNC 28595) and Belkin et al. (GCNC 28597). We thank the staff at OSN for their excellent support.