Abstract Details
| Name: Pradeep Chandra Affiliation: BARC, Mumbai Conference ID: ASI2019_281 Title : Detection of TeV flare from Mrk 421 using TACTIC during 2017-2018 Authors and Co-Authors : P Chandra, R C Rannot, K K Yadav, A K Tickoo, M P Das, A Tolamatti, B Ghosal, K K Singh, P Marandi, N K Agarwal, K K Gour, N Kumar, M Kothari, A Goyal, S Debangana, N Chouhan, V K Dhar, M K Koul, R. Koul, K Venugopal, C Borwankar, S Bhattacharyya, N Bhatt, S Sahayanathan, M Sharma, S Godambe, N Mankuzhiyil, K Chanchalani, S V Kotwal, S Godiyal. Abstract Type : Poster Abstract Category : Extragalactic Astronomy Abstract : The extragalactic TeV blazar Mrk421 (z = 0.030) has been observed at Very High Energy (VHE) energies using TACTIC gamma-ray telescope at Mt. Abu, Rajasthan (24.6 N, 72.7 E, 1300 m asl) during the period 16th Dec 2017 to 18th April 2018 for 240.4 hours. Preliminary data analysis indicates an excess of 1895 ± 131 gamma-ray like events from the source direction with a statistically significance of 14.46 sigma above 850GeV. The source was also detected in high emission state by FACT and HAWC in January, 2018. We have detected an enhanced gamma-ray flux from source direction on the night of January 17, 2018. Analysis of the recorded data collected for ~5.6 hours indicates that the average flux during the night ; MJD 58135.7822 - 58136.0273 was around 5 times the flux of Crab nebula above 850 GeV. The telescope has also detected the source on hourly basis at a significance level of ~5 sigma with a peak flux of ~7.7 times the Crab nebula flux during MJD 58135.9375 - 58135.9792. Results of detailed analysis of VHE observations will be presented in the meeting. |