//////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 23989 SUBJECT: Swift detection of LS I +61 303 DATE: 19/03/23 21:16:23 GMT FROM: Boris Sbarufatti at PSU S. D. Barthelmy (GSFC), J.D. Gropp (PSU), A. Y. Lien (GSFC/UMBC), D. M. Palmer (LANL) and B. Sbarufatti (PSU) report on behalf of the Neil Gehrels Swift Observatory Team: At 20:30:47 UT, the Swift Burst Alert Telescope (BAT) triggered and located LS I +61 303 (trigger=894557). Swift slewed immediately to the source. The BAT on-board calculated location is RA, Dec 40.153, +61.246 which is RA(J2000) = 02h 40m 37s Dec(J2000) = +61d 14' 45" with an uncertainty of 3 arcmin (radius, 90% containment, including systematic uncertainty). The BAT light curve showed multiple short spikes with a total duration of about 20 sec. The peak count rate was ~2400 counts/sec (15-350 keV), at ~3 sec after the trigger. The XRT began observing the field at 20:32:12.5 UT, 85.3 seconds after the BAT trigger. Using promptly downlinked data we find an X-ray source with an enhanced position: RA, Dec 40.1330, 61.2290 which is equivalent to: RA(J2000) = 02h 40m 31.91s Dec(J2000) = +61d 13' 44.2" with an uncertainty of 2.0 arcseconds (radius, 90% containment). This location is 70 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 http://www.swift.ac.uk/sper. This position is 2.0 arcseconds from LS I +61 303. This source is in the Swift XRT 1SXPS catalogue with a mean 0.3-10 keV count-rate of 0.19600 +/- 0.00093 ct/sec; see http://www.swift.ac.uk/1SXPS/1SXPSJ024031.5%2B611344 for details of these previous observations. A power-law fit to a spectrum formed from promptly downlinked event data gives a column density consistent with the Galactic value of 9.01 x 10^21 cm^-2 (Willingale et al. 2013). UVOT data cannot properly be analyzed at this time. A full analysis will be possible once the full dataset comes to the ground. The light curve from the BAT transient monitor is available at https://swift.gsfc.nasa.gov/results/transients/weak/LSIp61303/ //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 23991 SUBJECT: SWIFT GRB190323.85 Global MASTER-Net observations report DATE: 19/03/23 21:41:30 GMT FROM: Vladimir Lipunov at Moscow State U/Krylov Obs V. Lipunov, E. Gorbovskoy, V.Kornilov, D.Kuvshinov, N.Tyurina, P.Balanutsa, A.Kuznetsov, V.V.Chazov, D. Vlasenko Lomonosov Moscow State University, Sternberg Astronomical Institute, Moscow State University A. Tlatov, V.Senik, A.V. Parhomenko, D. Dormidontov Kislovodsk Solar Station of the Pulkovo Observatory K. Ivanov, O. Gres, N.M. Budnev, S. Yazev, O. Chuvalaev, V. Poleshchuk Irkutsk State University V. Yurkov, A. Gabovich, Yu. Sergienko Blagoveschensk Educational State University, Blagoveschensk R. Podesta, Carlos Lopez and F. Podesta Observatorio Astronomico Felix Aguilar (OAFA) Hugo Levato and Carlos Saffe Instituto de Ciencias Astronomicas, de la Tierra y del Espacio (ICATE) R. Rebolo, M. Serra, N. Lodieu, G. Israelian, L. Suarez-Andres The Instituto de Astrofisica de Canarias D. Buckley, S. Potter, A. Kniazev, M. Kotze South African Astronomical Observatory MASTER-IAC robotic telescope (Global MASTER-Net: http://observ.pereplet.ru, Lipunov et al., 2010, Advances in Astronomy, vol. 2010, 30L) located in Spain (IAC Teide Observatory) was pointed to the SWIFT GRB190323.85 ( 2h 40m 36.72s , +61d 14m 45.60s, R=0.05) 41 sec after trigger time at 2019-03-23 20:31:28 UT, with upper limit up to 18.5 mag. The observations began at zenit distance = 57 deg. The sun altitude is -17.5 deg. MASTER-Tunka robotic telescope located in Russia (Applied Physics Institute, Irkutsk State University) was pointed to the SWIFT GRB190323.85 68 sec after trigger time at 2019-03-23 20:31:55 UT, with upper limit up to 16.7 mag. The observations began at zenit distance = 67 deg. The sun altitude is -23.2 deg. The galactic latitude b = -60 deg., longitude l = 98 deg. We obtain a following upper limits. Tmid-T0 | Site |Filt.| Expt. | Limit| Comment _________|_____________________|_____|_______|______|________ 46 | MASTER-IAC | P- | 10 | 16.4 | 46 | MASTER-IAC | P| | 10 | 16.8 | 74 | MASTER-Tunka | C | 10 | 12.3 | 101 | MASTER-IAC | P- | 20 | 17.0 | 101 | MASTER-IAC | P| | 20 | 17.3 | 138 | MASTER-IAC | P- | 20 | 17.0 | 138 | MASTER-IAC | P| | 20 | 17.3 | 180 | MASTER-IAC | P- | 30 | 17.2 | 180 | MASTER-IAC | P| | 30 | 17.6 | 233 | MASTER-IAC | P- | 40 | 17.4 | 233 | MASTER-IAC | P| | 40 | 17.9 | 293 | MASTER-IAC | P- | 50 | 17.7 | 293 | MASTER-IAC | P| | 50 | 18.0 | 368 | MASTER-IAC | P| | 70 | 18.2 | 368 | MASTER-IAC | P- | 70 | 17.8 | 411 | MASTER-Tunka | P| | 70 | 16.4 | 458 | MASTER-IAC | P- | 80 | 18.0 | 458 | MASTER-IAC | P| | 80 | 18.4 | 563 | MASTER-IAC | P- | 100 | 18.0 | 563 | MASTER-IAC | P| | 100 | 18.5 | 567 | MASTER-Tunka | P| | 100 | 16.5 | 1239 | MASTER-Tunka | P| | 180 | 15.5 | 1489 | MASTER-Tunka | P| | 180 | 15.1 | 2272 | MASTER-Tunka | P| | 180 | 16.4 | 2524 | MASTER-Tunka | P| | 180 | 16.7 | Filter C is a clear (unfiltred) band. The observation and reduction will continue. The message may be cited. //////////////////////////////////////////////////////////////////////// TITLE: GCN CIRCULAR NUMBER: 24024 SUBJECT: MAGIC follow-up of the X-ray flares of LS I +61º303 dete DATE: 19/03/28 17:50:39 GMT FROM: Razmik Mirzoyan at MPI/MAGIC R. Mirzoyan, D. Hadasch, A. López-Oramas report on behalf of the MAGIC collaboration: The MAGIC telescopes have observed the direction (RA=+02:40:37h, DEC=+61:14:45deg, J2000.0) coincident with the location of the gamma-ray binary LS I +61º 303 (RA:+02:40:31.00, DEC:+61:13:45, J2000.0) in the very-high-energy (VHE; >100 GeV) range on March 23, 2019. The MAGIC observations were triggered by the flaring activity in X-rays measured by Swift-BAT on March 23, 2019 at 20:30:47 UT (S. D. Barthelmy et al., GCN circ. 23989, 2019) and by Swift-XRT at 20:32:12.5 UT. The preliminary Swift-BAT analysis showed multiple short spikes with a total duration of about 20 sec and a peak rate of about 2400 counts/sec (15-350 keV) 3 seconds after the trigger. The analysis of the MAGIC data taken ~20 minutes later on March 23, 2019 between 20:52:13.7 UTC (MJD 58565.8696) and 21:12:00.9 UTC (MJD 58565.8833) did not show any significant detection of LS I +61º 303 at VHE (significance (Li&Ma) < 0.5 sigma). After 0.33 hours of observations the integral flux upper limit for energies above 300 GeV is 2e-11 cm^-2 s^-1. The MAGIC contact persons for these observations are Razmik Mirzoyan ( Razmik.Mirzoyan@mpp.mpg.de), Daniela Hadasch ( hadasch@icrr.u-tokyo.ac.jp) and Alicia López-Oramas ( aloramas@iac.es).