BUY FOR NOW (TEMP):On daily chart ATT is a buy as it is hitting the LIGHT green support line from 2015 Aug low.
SHORT (IN WEEKLY CHART). The upper limit is Two red lines Dotted one and solid one. Once it touches those lines re-evaluate the situation and then you CAN GO SHORT. The support line will be on weekly chart is from 1984 low the SOLID DEEP GREEN LINE AROUND $25-$30 ZONE.