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GCN Circular 30933

Subject
IceCube-20210922A: No optical counterparts found by MITSuME observations
Date
2021-10-12T10:08:01Z (3 years ago)
From
Masafumi Niwano at Tokyo Institute of Tech <niwano@hp.phys.titech.ac.jp>
M. Niwano, R. Hosokawa, K. L. Murata, N. Kawai (Tokyo Tech),
R. Itoh (Bisei Astronomical Observatory), Y. Utsumi (SLAC)

We report optical imaging observations for finding an optical 
counterpart to IceCube event IC135736_30987826. We started our 
observations from 2021-09-23 15:13 UT (MJD=59480.63) and ended at 
2021-10-04 18:55 UT (MJD=59491.79).

We performed galaxy-targeted observations for 69 galaxies (see the table 
below) selected from the BROS Blazar catalog (Itoh et al. 2021) and the 
GLADE galaxy catalog (Dalya et al. 2018) in the probability skymap of 
IC135736_30987826 using MITSuME-Akeno: 50 cm MITSuME telescope at Akeno 
Observatory and a 3 color imager (g, Rc, Ic).

We found no apparent transient objects in these galaxies to 5 sigma 
limiting magnitudes in the AB system listed below.

galid���� ��ra(deg)���� ��dec(deg)���� ��dist(Mpc)���� ��g���� ��Rc���� ��Ic
BROS_J0401.5-0422���� ��60.381813���� ��-4.366799���� ��9999.0���� ��16.4 ��17.4���� ��17.1
BROS_J0400.4-0425���� ��60.113051���� ��-4.417749���� ��9999.0���� ��17.3 ��17.4���� ��17.2
BROS_J0359.1-0423���� ��59.795055���� ��-4.391522���� ��9999.0���� ��18.0 ��17.6���� ��17.1
BROS_J0402.9-0405���� ��60.741136���� ��-4.096962���� ��9999.0���� ��18.4 ��18.3���� ��17.8
BROS_J0358.9-0408���� ��59.741407���� ��-4.142756���� ��9999.0���� ��18.0 ��17.6���� ��17.1
BROS_J0402.5-0339���� ��60.637954���� ��-3.663903���� ��9999.0���� ��16.4 ��16.3���� ��16.0
BROS_J0357.9-0443���� ��59.481121���� ��-4.72601���� ��9999.0���� ��18.2 ��18.1���� ��17.4
BROS_J0402.4-0322���� ��60.622619���� ��-3.381488���� ��9999.0���� ��18.1 ��18.2���� ��17.8
BROS_J0407.4-0405���� ��61.866362���� ��-4.085092���� ��9999.0���� ��17.8 ��17.6���� ��16.9
BROS_J0407.5-0420���� ��61.886763���� ��-4.33758���� ��9999.0���� ��17.8 ��17.5���� ��16.9
BROS_J0356.9-0436���� ��59.229717���� ��-4.60147���� ��9999.0���� ��18.2 ��18.0���� ��17.4
BROS_J0400.3-0309���� ��60.075952���� ��-3.155558���� ��9999.0���� ��18.2 ��18.1���� ��17.5
BROS_J0400.5-0308���� ��60.125425���� ��-3.140577���� ��9999.0���� ��18.2 ��18.0���� ��17.5
BROS_J0359.3-0310���� ��59.846607���� ��-3.175879���� ��9999.0���� ��18.2 ��18.0���� ��17.4
BROS_J0406.6-0407���� ��61.650645���� ��-4.120446���� ��9999.0���� ��17.7 ��17.5���� ��16.9
BROS_J0407.2-0415���� ��61.814093���� ��-4.256252���� ��9999.0���� ��17.7 ��17.5���� ��16.9
GLADEbr000���� ��60.873493���� ��-3.998699���� ��776.58���� ��16.4���� ��16.3 ��16.0
GLADEbr001���� ��60.511959���� ��-3.850282���� ��669.76���� ��19.4���� ��19.3 ��18.2
GLADEbr002���� ��60.70639���� ��-4.420331���� ��584.97���� ��16.8���� ��16.5 ��16.1
GLADEbr003���� ��61.009609���� ��-4.161763���� ��550.55���� ��17.1���� ��16.8 ��18.4
GLADEbr004���� ��61.340942���� ��-4.024267���� ��601.03���� ��19.1���� ��19.6 ��18.4
GLADEbr005���� ��60.875721���� ��-3.990366���� ��595.34���� ��16.4���� ��16.3 ��16.0
GLADEbr006���� ��61.244709���� ��-4.505184���� ��821.77���� ��18.6���� ��18.4 ��17.3
GLADEbr007���� ��60.773819���� ��-3.919802���� ��661.31���� ��16.4���� ��16.3 ��16.0
GLADEbr008���� ��61.19709���� ��-3.799073���� ��312.54���� ��18.9���� ��19.0 ��17.6
GLADEbr010���� ��61.260109���� ��-4.550925���� ��812.37���� ��18.5���� ��18.4 ��17.3
GLADEbr011���� ��61.011189���� ��-4.462371���� ��573.14���� ��18.6���� ��19.4 ��17.3
GLADEbr012���� ��60.630688���� ��-3.72944���� ��707.06���� ��16.4���� ��16.3 ��15.9
GLADEbr013���� ��61.256248���� ��-4.29898���� ��831.97���� ��18.6���� ��18.4 ��17.5
GLADEbr014���� ��60.787174���� ��-3.999526���� ��657.58���� ��16.4���� ��16.3 ��16.0
GLADEbr015���� ��61.094845���� ��-4.067611���� ��281.12���� ��19.6���� ��19.6 ��18.4
GLADEbr016���� ��61.197075���� ��-4.243517���� ��427.98���� ��18.7���� ��18.4 ��17.3
GLADEbr017���� ��60.562199���� ��-3.827767���� ��634.20���� ��19.5���� ��19.3 ��18.2
GLADEbr018���� ��60.70779���� ��-4.344498���� ��718.37���� ��16.9���� ��16.5 ��16.1
GLADEbr019���� ��60.7243���� ��-4.66647���� ��903.64���� ��17.3���� ��16.9���� ��16.7
GLADEbr020���� ��60.4174���� ��-4.45656���� ��2691.5���� ��19.3���� ��19.2���� ��18.2
GLADEbr021���� ��60.453968���� ��-4.632778���� ��614.11���� ��19.4���� ��19.2 ��18.2
GLADEbr022���� ��60.835892���� ��-4.156475���� ��703.00���� ��16.8���� ��16.5 ��16.1
GLADEbr023���� ��60.6422���� ��-4.6555���� ��748.17���� ��17.3���� ��16.9���� ��16.7
GLADEbr024���� ��60.740658���� ��-4.453944���� ��511.17���� ��16.9���� ��16.5 ��16.1
GLADEbr026���� ��60.890892���� ��-3.658759���� ��364.06���� ��16.4���� ��19.7 ��16.0
GLADEbr027���� ��61.041843���� ��-4.541214���� ��755.09���� ��18.6���� ��18.4 ��18.2
GLADEbr028���� ��60.805511���� ��-4.38675���� ��331.92���� ��16.8���� ��16.5 ��16.1
GLADEbr030���� ��60.261082���� ��-3.836556���� ��331.80���� ��19.4���� ��19.3 ��18.2
GLADEbr032���� ��60.796963���� ��-3.628416���� ��365.60���� ��19.8���� ��16.3 ��16.0
GLADEbr033���� ��61.323677���� ��-4.013155���� ��285.61���� ��19.7���� ��19.6 ��18.4
GLADEbr034���� ��61.237743���� ��-4.293518���� ��516.20���� ��18.6���� ��18.4 ��17.4
GLADEbr035���� ��60.230717���� ��-3.930162���� ��527.75���� ��19.4���� ��19.2 ��18.2
GLADEbr037���� ��61.089005���� ��-4.015666���� ��269.71���� ��19.6���� ��19.6 ��18.4
GLADEbr038���� ��60.5329���� ��-4.50875���� ��790.67���� ��19.3���� ��19.2���� ��18.1
GLADEbr039���� ��60.992���� ��-4.51195���� ��2679.1���� ��18.6���� ��18.4���� ��18.3
GLADEbr040���� ��60.840626���� ��-4.172586���� ��370.78���� ��16.9���� ��16.5 ��18.5
GLADEbr041���� ��60.8438���� ��-4.78764���� ��748.17���� ��17.3���� ��16.9���� ��16.6
GLADEbr042���� ��61.153305���� ��-4.615459���� ��338.90���� ��18.5���� ��18.4 ��17.3
GLADEbr043���� ��60.680756���� ��-4.461996���� ��73.216���� ��19.8���� ��16.5 ��16.1
GLADEbr044���� ��60.4346���� ��-4.6138���� ��597.03���� ��19.3���� ��19.2���� ��18.1
GLADEbr045���� ��61.099���� ��-4.54441���� ��755.09���� ��18.6���� ��18.4���� ��99.9
GLADEbr046���� ��60.497204���� ��-3.808059���� ��257.57���� ��19.4���� ��19.3 ��18.1
GLADEbr047���� ��60.3525���� ��-4.45958���� ��1306.1���� ��19.4���� ��19.2���� ��18.2
GLADEbr048���� ��60.3873���� ��-4.56173���� ��602.56���� ��19.4���� ��19.2���� ��18.1
GLADEbr049���� ��60.409405���� ��-4.472772���� ��165.84���� ��19.4���� ��19.2 ��18.2
GLADEbr050���� ��60.7708���� ��-4.77726���� ��748.17���� ��17.3���� ��16.9���� ��16.6
GLADEbr051���� ��61.219074���� ��-4.492129���� ��151.07���� ��99.9���� ��18.4 ��17.3
GLADEbr052���� ��61.089291���� ��-3.940388���� ��191.57���� ��19.6���� ��19.6 ��18.4
GLADEbr053���� ��60.5727���� ��-4.58057���� ��295.12���� ��17.3���� ��19.2���� ��16.7
GLADEbr054���� ��61.108768���� ��-4.082613���� ��118.41���� ��19.7���� ��19.6 ��18.2
GLADEbr055���� ��61.044437���� ��-4.089826���� ��214.99���� ��19.6���� ��19.6 ��18.4
GLADEbr056���� ��60.7507���� ��-4.72274���� ��847.22���� ��17.3���� ��19.2���� ��16.7
GLADEbr057���� ��61.1088���� ��-4.08258���� ��123.37���� ��19.7���� ��19.6���� ��18.4

galid with "BROS_*" are based on the BROS catalog, which don't have 
distant measurements (put 9999.0).
The images were processed in real-time through the MITSuME GPU reduction 
pipeline (Niwano et al. 2021, PASJ; https://github.com/MNiwano/Eclaire).
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