0 ----- Attempting Submission 1 (Wed Oct 29 16:55:45 GMT 2014) ----- The bright gamma-ray source PMNJ1603-4904 exhibits very unusual multiwavelength properties, suggesting that this source might be the first young radio galaxy detected at GeV energies. A confirmation of this important result urgently needs excluding possible source confusion which could in principle account for the unusual broadband spectrum. We propose joint Chandra/ACIS-I (10ksec) and HST-WFC3UVIS (2000s) observations in order to validate this multiwavelength association, which is not trivial in this crowded field close to the Galactic plane. Deep imaging in the optical and X-rays is crucial for understanding the physical nature of this exceptional object and can only be addressed by these instruments requiring high angular resolution and low background. 1 orbit of HST/WFC3/UVIS imaging of target AGN/QUASARS Default false false 10 false false false SUPPORTED GALAXY ELLIPTICAL JET QUASAR RADIO GALAXY This object was generated by the targetselector and retrieved from the SIMBAD database.This object was generated by the targetselector and retrieved from the SIMBAD database. J2000 J2000 WFC3/UVIS Imaging No No POS-TARG DITHER 0.173 LINE 0.112 false false 81.785 4 23.884 WFC3-UVIS-DITHER-BOX 1 false /home/nela/work/OP-cache/pmn_HST_Chandra2014_phase2-v01.xml 1414600542348 The scheduling data was generated by CASM 22.2. CASM was run in Phase II mode. (Tic-Visit :proposal-id 13946 :visit-id "01" :proposal-version -1 :trans-version "20140605" :date "29-Oct-2014 17:35:41.0" :trans-errors '(:WARNINGS 0 :ERRORS 0 :HEALTH-AND-SAFETY 0 :FATAL-ERRORS 0 :CONTINUABLE-FATALS 0) :number-of-orbits 1 :saa-model "29" :si-bright-earth-limb-angle 20.0 :data-volume 1154992 :tdrss-contact-duration 0 :coron NIL ) (Tic-Obset :proposal-id 13946 :visit-id "01" :obset-id "01" :pcs-mode "FGS" ) (Tic-Orbit :proposal-id 13946 :visit-id "01" :orbit-number 1 :pcs-time 333 :si-vis-utilization 2992 :al-overhead-at-end 116 :internal-dur-at-end 668 :dark-offset NIL :dark-utilization 0 :max-dark-utilization 1920 :low-sky "N" :pcs-visibility 3358 :pcs-gap 0 ) true 1 0