RWY INCURSION AS A TAXIING CRJ200 MOVES INTO POS AND HOLD AS AN ACR FLT LANDS ON RWY 17R AT DEN; CO.

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AT DENVER INTL ARPT I WAS FO ON AIRLINE FLT FROM DEN TO ZZZ. ACFT WAS A CL65-200. WE DEPARTED FROM THE GATE AND CONTACTED GND. OUR TAXI INSTRUCTIONS WERE TO TAXI TO RWY 17L VIA TXWYS M; ED. APPROX 40 SECONDS LATER; GND ASKED IF WE WANT RWY 17R. CAPT SAID THAT'S FINE. I ADVISED GND WE'D LIKE RWY 17R. GND RESPONDS BE READY TO GO AT THE END OF RWY 17R. CAPT SAYS 'BEFORE TKOF; TO THE LINE' CHKLIST. I COMPLETE THE ITEMS. I TELL THE CAPT I'M OFF 'COM #1' TO ADVISE THE FLT ATTENDANTS. WHEN I CAME BACK I SAID; FLT ATTENDANTS ADVISED; 'BEFORE TKOF TO THE LINE' CHKLIST COMPLETED. CAPT RESPONDS; CLR L; BEFORE TKOF BELOW THE LINE; I COMPLETE THE BEFORE TKOF BELOW THE LINE ITEMS. AFTER READING THE LAST ITEM ON THE CHKLIST; AN ACR PLT COMES OVER THE RADIO AND SAYS; THERE IS AN ACFT TAXIING ONTO RWY 17R. TWR RESPONDS; 'WHAT DO YOU WANT TO DO?' NOTHING IS SAID. THE ACR Y'S B737 LANDS WITHOUT INCIDENT. TWR CALLS US AND ASKS IF WE RECEIVED A CLRNC TO TAXI ONTO THE RWY. CAPT RESPONDS -- I THINK WE DID. TWR THEN GIVES A PHONE NUMBER TO CALL. WHAT I LEARNED FROM THIS EVENT WAS; BEFORE I RUN 'BEFORE TKOF; BELOW THE LINE' CHKLISTS; I WILL VERIFY THAT WE ARE CLRED TO TAXI ONTO THE RWY. THIS WAS A UNIQUE SIT BECAUSE NORMALLY I AM ON THE RADIO TO RECEIVE TKOF CLRNC. HOWEVER; ON THIS FLT I WAS STILL COMPLETING BEFORE TKOF ITEMS BECAUSE OF THE SHORT TAXI. SUPPLEMENTAL INFO FROM ACN 620322: AFTER COMPLETING OUR CHKLISTS; I LOOKED DOWN FINAL AND SAW IT WAS CLR. I LOOKED TO THE R AND SAW AN ACR Y PLANE LNDG AND TAXIED INTO 'POS AND HOLD.' TWR INFORMED US THAT WE WERE NOT GIVEN 'POS AND HOLD' CLRNC. I BELIEVE I COULD HAVE PROBABLY SLOWED DOWN ON THE CHKLISTS AND INFORMED TWR THAT WE MAY NEED A LITTLE EXTRA TIME. I WAS TRYING TO HELP TWR FIT US INTO THE TKOF SLOT AFTER FLT Y LANDED.