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AT2018cow: MAXI GSC data search

ATel #11810; M. Sugizaki, N. Kawai, Y. Tachibana, K. Morita (Tokyo Tech), H. Negoro, M. Nakajima, A. Sakamaki, W. Maruyama (Nihon U.), T. Mihara, S. Nakahira, F. Yatabe, Y. Takao, M. Matsuoka (RIKEN), T. Sakamoto, M. Serino, S. Sugita, Y. Kawakubo, T. Hashimoto, A. Yoshida (AGU), S. Ueno, H. Tomida, M. Ishikawa, Y. Sugawara, N. Isobe, R. Shimomukai (JAXA), Y. Ueda, A. Tanimoto, T. Morita, S. Yamada (Kyoto U.), Y. Tsuboi, W. Iwakiri, R. Sasaki, H. Kawai, T. Sato (Chuo U.), H. Tsunemi, T. Yoneyama (Osaka U.), M. Yamauchi, K. Hidaka, S. Iwahori (Miyazaki U.), T. Kawamuro (NAOJ), K. Yamaoka (Nagoya U.), M. Shidatsu (Ehime U.) on behalf of MAXI Team
on 3 Jul 2018; 03:25 UT
Credential Certification: Mutsumi Sugizaki (sugizaki@riken.jp)

Subjects: X-ray, Supernovae, Transient

AT2018cow: MAXI GSC data search We investigated MAXI/GSC all-sky survey data of AT2013cow, discovered on 2016-06-15 (MJD 58284) (ATEL#11727). Since 2016-05-01 to 2016-06-14T05 (MJD 58283.21), the source sky position of (RA, Dec)=(244.00090, 22.26800) had been scanned with good GSC units in the normal-operation mode. After that time, it has been covered by the GSC_#3 unit, which has a problem in the veto function for the anti-coincidence background cut. We have not found any significant emission on the source location. Because the backgrounds of the GSC_#3 are higher by an order of magnitude than those of the normal GSCs, the sensitivity got worse by a factor of 4-5. The 3-simga upper limit on the 2-20 keV source flux for each scan transit from 2016-06-14 (MJD 58283) to 2016-06-16 (MJD 58286) is listed in the below.

 
Scan time (MJD) 3-sigma upper limit (mCrab) 
58283.017338    95 
58283.081678    86 
58283.146019    82 
58283.210347    81 
58283.274688    308 
58283.339028    360 
58283.403333    506 
58284.111123    548 
58284.175463    408 
58284.239803    339 
58284.304144    294 
58284.368484    281 
58284.432836    261 
58284.497176    276 
58284.561516    269 
58284.625868    270 
58284.690208    272 
58284.754560    274 
58284.818900    295 
58284.883252    294 
58284.947593    328 
58285.076285    298 
58285.140625    283 
58285.204977    285 
58285.269329    274 
58285.333669    264 
58285.398009    267 
58285.462361    275 
58285.526701    266 
58285.591053    263 
58285.655405    271 
58285.719757    276 
58285.784109    300 
58285.848461    304 
58285.912812    311 
The light-curve data preliminarily processed from 2018-06-01 to 2018-06-25 are on the web pageAT2018cow/index.html"> http://maxi.riken.jp/figure/AT2018cow/index.html