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CCD Observations and Period Change of the Type ab RR Lyrae Star DV Mon
Dambis, A. K.; Berdnikov, L. N.; Kniazev, A. Yu. +3 more
We took a total of 635 B-, V-, and Ic-band CCD frames for the RRab Lyr type variable DVMon, which has a close bright visual companion with a separation of about 1.9'. Observations were made with the 76-cm telescope of the South African Astronomical Observatory (SAAO, South Africa) using SBIG CCD ST-10XME. For the first time, we obtained…
Short gamma-ray bursts in the SPI-ACS INTEGRAL experiment
Minaev, P. Yu.; Pozanenko, A. S.; Loznikov, V. M.
We analyze short-duration gamma-ray bursts (T90<2 s) recorded in the SPI-ACS experiment of the INTEGRAL observatory. We found an extended emission in the averaged light curve of both short-duration gamma-ray bursts and unidentified short-duration events. We show that the fraction of short-duration gamma-ray bursts among all the gamma…